drm: omapdrm: dss: Allocate the DSS private data structure dynamically

The DSS private data structure is currently stored as a global variable.
While no platform with multiple DSS devices currently exists nor is
planned, this doesn't comply with the kernel device model and should
thus be fixed.

Allocate the DSS private data structure dynamically for each DSS
instance and remove the global variable. All code that need access to
the structure now retrieves it dynamically so we can remove the global
variable.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

drivers/gpu/drm/omapdrm/dss/dss.c

@@ -62,11 +62,12 @@ struct dss_reg {
 #define DSS_PLL_CONTROL			DSS_REG(0x0048)
 #define DSS_SDI_STATUS			DSS_REG(0x005C)
 
-#define REG_GET(idx, start, end) \
-	FLD_GET(dss_read_reg(idx), start, end)
+#define REG_GET(dss, idx, start, end) \
+	FLD_GET(dss_read_reg(dss, idx), start, end)
 
-#define REG_FLD_MOD(idx, val, start, end) \
-	dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
+#define REG_FLD_MOD(dss, idx, val, start, end) \
+	dss_write_reg(dss, idx, \
+		      FLD_MOD(dss_read_reg(dss, idx), val, start, end))
 
 struct dss_ops {
 	int (*dpi_select_source)(struct dss_device *dss, int port,
@@ -90,8 +91,6 @@ struct dss_features {
 	bool has_lcd_clk_src;
 };
 
-static struct dss_device dss;
-
 static const char * const dss_generic_clk_source_names[] = {
 	[DSS_CLK_SRC_FCK]	= "FCK",
 	[DSS_CLK_SRC_PLL1_1]	= "PLL1:1",
@@ -103,49 +102,50 @@ static const char * const dss_generic_clk_source_names[] = {
 	[DSS_CLK_SRC_HDMI_PLL]	= "HDMI PLL",
 };
 
-static inline void dss_write_reg(const struct dss_reg idx, u32 val)
+static inline void dss_write_reg(struct dss_device *dss,
+				 const struct dss_reg idx, u32 val)
 {
-	__raw_writel(val, dss.base + idx.idx);
+	__raw_writel(val, dss->base + idx.idx);
 }
 
-static inline u32 dss_read_reg(const struct dss_reg idx)
+static inline u32 dss_read_reg(struct dss_device *dss, const struct dss_reg idx)
 {
-	return __raw_readl(dss.base + idx.idx);
+	return __raw_readl(dss->base + idx.idx);
 }
 
-#define SR(reg) \
-	dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
-#define RR(reg) \
-	dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
+#define SR(dss, reg) \
+	dss->ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(dss, DSS_##reg)
+#define RR(dss, reg) \
+	dss_write_reg(dss, DSS_##reg, dss->ctx[(DSS_##reg).idx / sizeof(u32)])
 
-static void dss_save_context(void)
+static void dss_save_context(struct dss_device *dss)
 {
 	DSSDBG("dss_save_context\n");
 
-	SR(CONTROL);
+	SR(dss, CONTROL);
 
-	if (dss.feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
-		SR(SDI_CONTROL);
-		SR(PLL_CONTROL);
+	if (dss->feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
+		SR(dss, SDI_CONTROL);
+		SR(dss, PLL_CONTROL);
 	}
 
-	dss.ctx_valid = true;
+	dss->ctx_valid = true;
 
 	DSSDBG("context saved\n");
 }
 
-static void dss_restore_context(void)
+static void dss_restore_context(struct dss_device *dss)
 {
 	DSSDBG("dss_restore_context\n");
 
-	if (!dss.ctx_valid)
+	if (!dss->ctx_valid)
 		return;
 
-	RR(CONTROL);
+	RR(dss, CONTROL);
 
-	if (dss.feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
-		RR(SDI_CONTROL);
-		RR(PLL_CONTROL);
+	if (dss->feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
+		RR(dss, SDI_CONTROL);
+		RR(dss, PLL_CONTROL);
 	}
 
 	DSSDBG("context restored\n");
@@ -184,12 +184,13 @@ void dss_ctrl_pll_enable(struct dss_pll *pll, bool enable)
 			   1 << shift, val << shift);
 }
 
-static int dss_ctrl_pll_set_control_mux(enum dss_clk_source clk_src,
-	enum omap_channel channel)
+static int dss_ctrl_pll_set_control_mux(struct dss_device *dss,
+					enum dss_clk_source clk_src,
+					enum omap_channel channel)
 {
 	unsigned int shift, val;
 
-	if (!dss.syscon_pll_ctrl)
+	if (!dss->syscon_pll_ctrl)
 		return -EINVAL;
 
 	switch (channel) {
@@ -244,7 +245,7 @@ static int dss_ctrl_pll_set_control_mux(enum dss_clk_source clk_src,
 		return -EINVAL;
 	}
 
-	regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
+	regmap_update_bits(dss->syscon_pll_ctrl, dss->syscon_pll_ctrl_offset,
 		0x3 << shift, val << shift);
 
 	return 0;
@@ -256,17 +257,17 @@ void dss_sdi_init(struct dss_device *dss, int datapairs)
 
 	BUG_ON(datapairs > 3 || datapairs < 1);
 
-	l = dss_read_reg(DSS_SDI_CONTROL);
+	l = dss_read_reg(dss, DSS_SDI_CONTROL);
 	l = FLD_MOD(l, 0xf, 19, 15);		/* SDI_PDIV */
 	l = FLD_MOD(l, datapairs-1, 3, 2);	/* SDI_PRSEL */
 	l = FLD_MOD(l, 2, 1, 0);		/* SDI_BWSEL */
-	dss_write_reg(DSS_SDI_CONTROL, l);
+	dss_write_reg(dss, DSS_SDI_CONTROL, l);
 
-	l = dss_read_reg(DSS_PLL_CONTROL);
+	l = dss_read_reg(dss, DSS_PLL_CONTROL);
 	l = FLD_MOD(l, 0x7, 25, 22);	/* SDI_PLL_FREQSEL */
 	l = FLD_MOD(l, 0xb, 16, 11);	/* SDI_PLL_REGN */
 	l = FLD_MOD(l, 0xb4, 10, 1);	/* SDI_PLL_REGM */
-	dss_write_reg(DSS_PLL_CONTROL, l);
+	dss_write_reg(dss, DSS_PLL_CONTROL, l);
 }
 
 int dss_sdi_enable(struct dss_device *dss)
@@ -276,15 +277,15 @@ int dss_sdi_enable(struct dss_device *dss)
 	dispc_pck_free_enable(1);
 
 	/* Reset SDI PLL */
-	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
+	REG_FLD_MOD(dss, DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
 	udelay(1);	/* wait 2x PCLK */
 
 	/* Lock SDI PLL */
-	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
+	REG_FLD_MOD(dss, DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
 
 	/* Waiting for PLL lock request to complete */
 	timeout = jiffies + msecs_to_jiffies(500);
-	while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
+	while (dss_read_reg(dss, DSS_SDI_STATUS) & (1 << 6)) {
 		if (time_after_eq(jiffies, timeout)) {
 			DSSERR("PLL lock request timed out\n");
 			goto err1;
@@ -292,11 +293,11 @@ int dss_sdi_enable(struct dss_device *dss)
 	}
 
 	/* Clearing PLL_GO bit */
-	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
+	REG_FLD_MOD(dss, DSS_PLL_CONTROL, 0, 28, 28);
 
 	/* Waiting for PLL to lock */
 	timeout = jiffies + msecs_to_jiffies(500);
-	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
+	while (!(dss_read_reg(dss, DSS_SDI_STATUS) & (1 << 5))) {
 		if (time_after_eq(jiffies, timeout)) {
 			DSSERR("PLL lock timed out\n");
 			goto err1;
@@ -307,7 +308,7 @@ int dss_sdi_enable(struct dss_device *dss)
 
 	/* Waiting for SDI reset to complete */
 	timeout = jiffies + msecs_to_jiffies(500);
-	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
+	while (!(dss_read_reg(dss, DSS_SDI_STATUS) & (1 << 2))) {
 		if (time_after_eq(jiffies, timeout)) {
 			DSSERR("SDI reset timed out\n");
 			goto err2;
@@ -320,7 +321,7 @@ int dss_sdi_enable(struct dss_device *dss)
 	dispc_lcd_enable_signal(0);
  err1:
 	/* Reset SDI PLL */
-	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
+	REG_FLD_MOD(dss, DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
 
 	dispc_pck_free_enable(0);
 
@@ -334,7 +335,7 @@ void dss_sdi_disable(struct dss_device *dss)
 	dispc_pck_free_enable(0);
 
 	/* Reset SDI PLL */
-	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
+	REG_FLD_MOD(dss, DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
 }
 
 const char *dss_get_clk_source_name(enum dss_clk_source clk_src)
@@ -343,46 +344,48 @@ const char *dss_get_clk_source_name(enum dss_clk_source clk_src)
 }
 
 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
-static void dss_dump_clocks(struct seq_file *s)
+static void dss_dump_clocks(struct dss_device *dss, struct seq_file *s)
 {
 	const char *fclk_name;
 	unsigned long fclk_rate;
 
-	if (dss_runtime_get(&dss))
+	if (dss_runtime_get(dss))
 		return;
 
 	seq_printf(s, "- DSS -\n");
 
 	fclk_name = dss_get_clk_source_name(DSS_CLK_SRC_FCK);
-	fclk_rate = clk_get_rate(dss.dss_clk);
+	fclk_rate = clk_get_rate(dss->dss_clk);
 
 	seq_printf(s, "%s = %lu\n",
 			fclk_name,
 			fclk_rate);
 
-	dss_runtime_put(&dss);
+	dss_runtime_put(dss);
 }
 #endif
 
 static void dss_dump_regs(struct seq_file *s)
 {
-#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
+	struct dss_device *dss = s->private;
+
+#define DUMPREG(dss, r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(dss, r))
 
-	if (dss_runtime_get(&dss))
+	if (dss_runtime_get(dss))
 		return;
 
-	DUMPREG(DSS_REVISION);
-	DUMPREG(DSS_SYSCONFIG);
-	DUMPREG(DSS_SYSSTATUS);
-	DUMPREG(DSS_CONTROL);
+	DUMPREG(dss, DSS_REVISION);
+	DUMPREG(dss, DSS_SYSCONFIG);
+	DUMPREG(dss, DSS_SYSSTATUS);
+	DUMPREG(dss, DSS_CONTROL);
 
-	if (dss.feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
-		DUMPREG(DSS_SDI_CONTROL);
-		DUMPREG(DSS_PLL_CONTROL);
-		DUMPREG(DSS_SDI_STATUS);
+	if (dss->feat->outputs[OMAP_DSS_CHANNEL_LCD] & OMAP_DSS_OUTPUT_SDI) {
+		DUMPREG(dss, DSS_SDI_CONTROL);
+		DUMPREG(dss, DSS_PLL_CONTROL);
+		DUMPREG(dss, DSS_SDI_STATUS);
 	}
 
-	dss_runtime_put(&dss);
+	dss_runtime_put(dss);
 #undef DUMPREG
 }
 
@@ -401,7 +404,8 @@ static int dss_get_channel_index(enum omap_channel channel)
 	}
 }
 
-static void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
+static void dss_select_dispc_clk_source(struct dss_device *dss,
+					enum dss_clk_source clk_src)
 {
 	int b;
 
@@ -409,7 +413,7 @@ static void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
 	 * We always use PRCM clock as the DISPC func clock, except on DSS3,
 	 * where we don't have separate DISPC and LCD clock sources.
 	 */
-	if (WARN_ON(dss.feat->has_lcd_clk_src && clk_src != DSS_CLK_SRC_FCK))
+	if (WARN_ON(dss->feat->has_lcd_clk_src && clk_src != DSS_CLK_SRC_FCK))
 		return;
 
 	switch (clk_src) {
@@ -427,11 +431,11 @@ static void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
 		return;
 	}
 
-	REG_FLD_MOD(DSS_CONTROL, b,			/* DISPC_CLK_SWITCH */
-		    dss.feat->dispc_clk_switch.start,
-		    dss.feat->dispc_clk_switch.end);
+	REG_FLD_MOD(dss, DSS_CONTROL, b,		/* DISPC_CLK_SWITCH */
+		    dss->feat->dispc_clk_switch.start,
+		    dss->feat->dispc_clk_switch.end);
 
-	dss.dispc_clk_source = clk_src;
+	dss->dispc_clk_source = clk_src;
 }
 
 void dss_select_dsi_clk_source(struct dss_device *dss, int dsi_module,
@@ -457,7 +461,7 @@ void dss_select_dsi_clk_source(struct dss_device *dss, int dsi_module,
 	}
 
 	pos = dsi_module == 0 ? 1 : 10;
-	REG_FLD_MOD(DSS_CONTROL, b, pos, pos);	/* DSIx_CLK_SWITCH */
+	REG_FLD_MOD(dss, DSS_CONTROL, b, pos, pos);	/* DSIx_CLK_SWITCH */
 
 	dss->dsi_clk_source[dsi_module] = clk_src;
 }
@@ -477,15 +481,15 @@ static int dss_lcd_clk_mux_dra7(struct dss_device *dss,
 
 	if (clk_src == DSS_CLK_SRC_FCK) {
 		/* LCDx_CLK_SWITCH */
-		REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
+		REG_FLD_MOD(dss, DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 		return -EINVAL;
 	}
 
-	r = dss_ctrl_pll_set_control_mux(clk_src, channel);
+	r = dss_ctrl_pll_set_control_mux(dss, clk_src, channel);
 	if (r)
 		return r;
 
-	REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
+	REG_FLD_MOD(dss, DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 
 	return 0;
 }
@@ -509,14 +513,14 @@ static int dss_lcd_clk_mux_omap5(struct dss_device *dss,
 
 	if (clk_src == DSS_CLK_SRC_FCK) {
 		/* LCDx_CLK_SWITCH */
-		REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
+		REG_FLD_MOD(dss, DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 		return -EINVAL;
 	}
 
 	if (WARN_ON(allowed_plls[channel] != clk_src))
 		return -EINVAL;
 
-	REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
+	REG_FLD_MOD(dss, DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 
 	return 0;
 }
@@ -538,14 +542,14 @@ static int dss_lcd_clk_mux_omap4(struct dss_device *dss,
 
 	if (clk_src == DSS_CLK_SRC_FCK) {
 		/* LCDx_CLK_SWITCH */
-		REG_FLD_MOD(DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
+		REG_FLD_MOD(dss, DSS_CONTROL, 0, ctrl_bit, ctrl_bit);
 		return 0;
 	}
 
 	if (WARN_ON(allowed_plls[channel] != clk_src))
 		return -EINVAL;
 
-	REG_FLD_MOD(DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
+	REG_FLD_MOD(dss, DSS_CONTROL, 1, ctrl_bit, ctrl_bit);
 
 	return 0;
 }
@@ -558,7 +562,7 @@ void dss_select_lcd_clk_source(struct dss_device *dss,
 	int r;
 
 	if (!dss->feat->has_lcd_clk_src) {
-		dss_select_dispc_clk_source(clk_src);
+		dss_select_dispc_clk_source(dss, clk_src);
 		dss->lcd_clk_source[idx] = clk_src;
 		return;
 	}
@@ -672,26 +676,27 @@ enum omap_dss_output_id dss_get_supported_outputs(struct dss_device *dss,
 	return dss->feat->outputs[channel];
 }
 
-static int dss_setup_default_clock(void)
+static int dss_setup_default_clock(struct dss_device *dss)
 {
 	unsigned long max_dss_fck, prate;
 	unsigned long fck;
 	unsigned int fck_div;
 	int r;
 
-	max_dss_fck = dss.feat->fck_freq_max;
+	max_dss_fck = dss->feat->fck_freq_max;
 
-	if (dss.parent_clk == NULL) {
-		fck = clk_round_rate(dss.dss_clk, max_dss_fck);
+	if (dss->parent_clk == NULL) {
+		fck = clk_round_rate(dss->dss_clk, max_dss_fck);
 	} else {
-		prate = clk_get_rate(dss.parent_clk);
+		prate = clk_get_rate(dss->parent_clk);
 
-		fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
+		fck_div = DIV_ROUND_UP(prate * dss->feat->dss_fck_multiplier,
 				max_dss_fck);
-		fck = DIV_ROUND_UP(prate, fck_div) * dss.feat->dss_fck_multiplier;
+		fck = DIV_ROUND_UP(prate, fck_div)
+		    * dss->feat->dss_fck_multiplier;
 	}
 
-	r = dss_set_fck_rate(&dss, fck);
+	r = dss_set_fck_rate(dss, fck);
 	if (r)
 		return r;
 
@@ -710,12 +715,13 @@ void dss_set_venc_output(struct dss_device *dss, enum omap_dss_venc_type type)
 		BUG();
 
 	/* venc out selection. 0 = comp, 1 = svideo */
-	REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
+	REG_FLD_MOD(dss, DSS_CONTROL, l, 6, 6);
 }
 
 void dss_set_dac_pwrdn_bgz(struct dss_device *dss, bool enable)
 {
-	REG_FLD_MOD(DSS_CONTROL, enable, 5, 5);	/* DAC Power-Down Control */
+	/* DAC Power-Down Control */
+	REG_FLD_MOD(dss, DSS_CONTROL, enable, 5, 5);
 }
 
 void dss_select_hdmi_venc_clk_source(struct dss_device *dss,
@@ -732,7 +738,8 @@ void dss_select_hdmi_venc_clk_source(struct dss_device *dss,
 	/* Select only if we have options */
 	if ((outputs & OMAP_DSS_OUTPUT_VENC) &&
 	    (outputs & OMAP_DSS_OUTPUT_HDMI))
-		REG_FLD_MOD(DSS_CONTROL, src, 15, 15);	/* VENC_HDMI_SWITCH */
+		/* VENC_HDMI_SWITCH */
+		REG_FLD_MOD(dss, DSS_CONTROL, src, 15, 15);
 }
 
 static int dss_dpi_select_source_omap2_omap3(struct dss_device *dss, int port,
@@ -760,7 +767,7 @@ static int dss_dpi_select_source_omap4(struct dss_device *dss, int port,
 		return -EINVAL;
 	}
 
-	REG_FLD_MOD(DSS_CONTROL, val, 17, 17);
+	REG_FLD_MOD(dss, DSS_CONTROL, val, 17, 17);
 
 	return 0;
 }
@@ -787,7 +794,7 @@ static int dss_dpi_select_source_omap5(struct dss_device *dss, int port,
 		return -EINVAL;
 	}
 
-	REG_FLD_MOD(DSS_CONTROL, val, 17, 16);
+	REG_FLD_MOD(dss, DSS_CONTROL, val, 17, 16);
 
 	return 0;
 }
@@ -819,37 +826,38 @@ int dss_dpi_select_source(struct dss_device *dss, int port,
 	return dss->feat->ops->dpi_select_source(dss, port, channel);
 }
 
-static int dss_get_clocks(void)
+static int dss_get_clocks(struct dss_device *dss)
 {
 	struct clk *clk;
 
-	clk = devm_clk_get(&dss.pdev->dev, "fck");
+	clk = devm_clk_get(&dss->pdev->dev, "fck");
 	if (IS_ERR(clk)) {
 		DSSERR("can't get clock fck\n");
 		return PTR_ERR(clk);
 	}
 
-	dss.dss_clk = clk;
+	dss->dss_clk = clk;
 
-	if (dss.feat->parent_clk_name) {
-		clk = clk_get(NULL, dss.feat->parent_clk_name);
+	if (dss->feat->parent_clk_name) {
+		clk = clk_get(NULL, dss->feat->parent_clk_name);
 		if (IS_ERR(clk)) {
-			DSSERR("Failed to get %s\n", dss.feat->parent_clk_name);
+			DSSERR("Failed to get %s\n",
+			       dss->feat->parent_clk_name);
 			return PTR_ERR(clk);
 		}
 	} else {
 		clk = NULL;
 	}
 
-	dss.parent_clk = clk;
+	dss->parent_clk = clk;
 
 	return 0;
 }
 
-static void dss_put_clocks(void)
+static void dss_put_clocks(struct dss_device *dss)
 {
-	if (dss.parent_clk)
-		clk_put(dss.parent_clk);
+	if (dss->parent_clk)
+		clk_put(dss->parent_clk);
 }
 
 int dss_runtime_get(struct dss_device *dss)
@@ -875,14 +883,16 @@ void dss_runtime_put(struct dss_device *dss)
 
 struct dss_device *dss_get_device(struct device *dev)
 {
-	return &dss;
+	return dev_get_drvdata(dev);
 }
 
 /* DEBUGFS */
 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 static void dss_debug_dump_clocks(struct seq_file *s)
 {
-	dss_dump_clocks(s);
+	struct dss_device *dss = s->private;
+
+	dss_dump_clocks(dss, s);
 	dispc_dump_clocks(s);
 #ifdef CONFIG_OMAP2_DSS_DSI
 	dsi_dump_clocks(s);
@@ -911,7 +921,7 @@ static const struct file_operations dss_debug_fops = {
 
 static struct dentry *dss_debugfs_dir;
 
-static int dss_initialize_debugfs(void)
+static int dss_initialize_debugfs(struct dss_device *dss)
 {
 	dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 	if (IS_ERR(dss_debugfs_dir)) {
@@ -943,7 +953,7 @@ int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 	return PTR_ERR_OR_ZERO(d);
 }
 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
-static inline int dss_initialize_debugfs(void)
+static inline int dss_initialize_debugfs(struct dss_device *dss)
 {
 	return 0;
 }
@@ -1148,23 +1158,24 @@ static const struct dss_features dra7xx_dss_feats = {
 	.has_lcd_clk_src	=	true,
 };
 
-static int dss_init_ports(struct platform_device *pdev)
+static int dss_init_ports(struct dss_device *dss)
 {
+	struct platform_device *pdev = dss->pdev;
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
 	int i;
 
-	for (i = 0; i < dss.feat->num_ports; i++) {
+	for (i = 0; i < dss->feat->num_ports; i++) {
 		port = of_graph_get_port_by_id(parent, i);
 		if (!port)
 			continue;
 
-		switch (dss.feat->ports[i]) {
+		switch (dss->feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
-			dpi_init_port(&dss, pdev, port, dss.feat->model);
+			dpi_init_port(dss, pdev, port, dss->feat->model);
 			break;
 		case OMAP_DISPLAY_TYPE_SDI:
-			sdi_init_port(&dss, pdev, port);
+			sdi_init_port(dss, pdev, port);
 			break;
 		default:
 			break;
@@ -1174,18 +1185,19 @@ static int dss_init_ports(struct platform_device *pdev)
 	return 0;
 }
 
-static void dss_uninit_ports(struct platform_device *pdev)
+static void dss_uninit_ports(struct dss_device *dss)
 {
+	struct platform_device *pdev = dss->pdev;
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
 	int i;
 
-	for (i = 0; i < dss.feat->num_ports; i++) {
+	for (i = 0; i < dss->feat->num_ports; i++) {
 		port = of_graph_get_port_by_id(parent, i);
 		if (!port)
 			continue;
 
-		switch (dss.feat->ports[i]) {
+		switch (dss->feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
 			dpi_uninit_port(port);
 			break;
@@ -1198,8 +1210,9 @@ static void dss_uninit_ports(struct platform_device *pdev)
 	}
 }
 
-static int dss_video_pll_probe(struct platform_device *pdev)
+static int dss_video_pll_probe(struct dss_device *dss)
 {
+	struct platform_device *pdev = dss->pdev;
 	struct device_node *np = pdev->dev.of_node;
 	struct regulator *pll_regulator;
 	int r;
@@ -1208,16 +1221,16 @@ static int dss_video_pll_probe(struct platform_device *pdev)
 		return 0;
 
 	if (of_property_read_bool(np, "syscon-pll-ctrl")) {
-		dss.syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
+		dss->syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
 			"syscon-pll-ctrl");
-		if (IS_ERR(dss.syscon_pll_ctrl)) {
+		if (IS_ERR(dss->syscon_pll_ctrl)) {
 			dev_err(&pdev->dev,
 				"failed to get syscon-pll-ctrl regmap\n");
-			return PTR_ERR(dss.syscon_pll_ctrl);
+			return PTR_ERR(dss->syscon_pll_ctrl);
 		}
 
 		if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
-				&dss.syscon_pll_ctrl_offset)) {
+				&dss->syscon_pll_ctrl_offset)) {
 			dev_err(&pdev->dev,
 				"failed to get syscon-pll-ctrl offset\n");
 			return -EINVAL;
@@ -1243,18 +1256,18 @@ static int dss_video_pll_probe(struct platform_device *pdev)
 	}
 
 	if (of_property_match_string(np, "reg-names", "pll1") >= 0) {
-		dss.video1_pll = dss_video_pll_init(&dss, pdev, 0,
-						    pll_regulator);
-		if (IS_ERR(dss.video1_pll))
-			return PTR_ERR(dss.video1_pll);
+		dss->video1_pll = dss_video_pll_init(dss, pdev, 0,
+						     pll_regulator);
+		if (IS_ERR(dss->video1_pll))
+			return PTR_ERR(dss->video1_pll);
 	}
 
 	if (of_property_match_string(np, "reg-names", "pll2") >= 0) {
-		dss.video2_pll = dss_video_pll_init(&dss, pdev, 1,
-						    pll_regulator);
-		if (IS_ERR(dss.video2_pll)) {
-			dss_video_pll_uninit(dss.video1_pll);
-			return PTR_ERR(dss.video2_pll);
+		dss->video2_pll = dss_video_pll_init(dss, pdev, 1,
+						     pll_regulator);
+		if (IS_ERR(dss->video2_pll)) {
+			dss_video_pll_uninit(dss->video1_pll);
+			return PTR_ERR(dss->video2_pll);
 		}
 	}
 
@@ -1345,14 +1358,14 @@ static int dss_probe_hardware(struct dss_device *dss)
 	dss->dss_clk_rate = clk_get_rate(dss->dss_clk);
 
 	/* Select DPLL */
-	REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
+	REG_FLD_MOD(dss, DSS_CONTROL, 0, 0, 0);
 
-	dss_select_dispc_clk_source(DSS_CLK_SRC_FCK);
+	dss_select_dispc_clk_source(dss, DSS_CLK_SRC_FCK);
 
 #ifdef CONFIG_OMAP2_DSS_VENC
-	REG_FLD_MOD(DSS_CONTROL, 1, 4, 4);	/* venc dac demen */
-	REG_FLD_MOD(DSS_CONTROL, 1, 3, 3);	/* venc clock 4x enable */
-	REG_FLD_MOD(DSS_CONTROL, 0, 2, 2);	/* venc clock mode = normal */
+	REG_FLD_MOD(dss, DSS_CONTROL, 1, 4, 4);	/* venc dac demen */
+	REG_FLD_MOD(dss, DSS_CONTROL, 1, 3, 3);	/* venc clock 4x enable */
+	REG_FLD_MOD(dss, DSS_CONTROL, 0, 2, 2);	/* venc clock mode = normal */
 #endif
 	dss->dsi_clk_source[0] = DSS_CLK_SRC_FCK;
 	dss->dsi_clk_source[1] = DSS_CLK_SRC_FCK;
@@ -1360,7 +1373,7 @@ static int dss_probe_hardware(struct dss_device *dss)
 	dss->lcd_clk_source[0] = DSS_CLK_SRC_FCK;
 	dss->lcd_clk_source[1] = DSS_CLK_SRC_FCK;
 
-	rev = dss_read_reg(DSS_REVISION);
+	rev = dss_read_reg(dss, DSS_REVISION);
 	pr_info("OMAP DSS rev %d.%d\n", FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
 
 	dss_runtime_put(dss);
@@ -1373,14 +1386,20 @@ static int dss_probe(struct platform_device *pdev)
 	const struct soc_device_attribute *soc;
 	struct component_match *match = NULL;
 	struct resource *dss_mem;
+	struct dss_device *dss;
 	int r;
 
-	dss.pdev = pdev;
+	dss = kzalloc(sizeof(*dss), GFP_KERNEL);
+	if (!dss)
+		return -ENOMEM;
+
+	dss->pdev = pdev;
+	platform_set_drvdata(pdev, dss);
 
 	r = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 	if (r) {
 		dev_err(&pdev->dev, "Failed to set the DMA mask\n");
-		return r;
+		goto err_free_dss;
 	}
 
 	/*
@@ -1389,42 +1408,44 @@ static int dss_probe(struct platform_device *pdev)
 	 */
 	soc = soc_device_match(dss_soc_devices);
 	if (soc)
-		dss.feat = soc->data;
+		dss->feat = soc->data;
 	else
-		dss.feat = of_match_device(dss_of_match, &pdev->dev)->data;
+		dss->feat = of_match_device(dss_of_match, &pdev->dev)->data;
 
 	/* Map I/O registers, get and setup clocks. */
 	dss_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dss.base = devm_ioremap_resource(&pdev->dev, dss_mem);
-	if (IS_ERR(dss.base))
-		return PTR_ERR(dss.base);
+	dss->base = devm_ioremap_resource(&pdev->dev, dss_mem);
+	if (IS_ERR(dss->base)) {
+		r = PTR_ERR(dss->base);
+		goto err_free_dss;
+	}
 
-	r = dss_get_clocks();
+	r = dss_get_clocks(dss);
 	if (r)
-		return r;
+		goto err_free_dss;
 
-	r = dss_setup_default_clock();
+	r = dss_setup_default_clock(dss);
 	if (r)
 		goto err_put_clocks;
 
 	/* Setup the video PLLs and the DPI and SDI ports. */
-	r = dss_video_pll_probe(pdev);
+	r = dss_video_pll_probe(dss);
 	if (r)
 		goto err_put_clocks;
 
-	r = dss_init_ports(pdev);
+	r = dss_init_ports(dss);
 	if (r)
 		goto err_uninit_plls;
 
 	/* Enable runtime PM and probe the hardware. */
 	pm_runtime_enable(&pdev->dev);
 
-	r = dss_probe_hardware(&dss);
+	r = dss_probe_hardware(dss);
 	if (r)
 		goto err_pm_runtime_disable;
 
 	/* Initialize debugfs. */
-	r = dss_initialize_debugfs();
+	r = dss_initialize_debugfs(dss);
 	if (r)
 		goto err_pm_runtime_disable;
 
@@ -1444,37 +1465,44 @@ static int dss_probe(struct platform_device *pdev)
 
 err_pm_runtime_disable:
 	pm_runtime_disable(&pdev->dev);
-	dss_uninit_ports(pdev);
+	dss_uninit_ports(dss);
 
 err_uninit_plls:
-	if (dss.video1_pll)
-		dss_video_pll_uninit(dss.video1_pll);
-	if (dss.video2_pll)
-		dss_video_pll_uninit(dss.video2_pll);
+	if (dss->video1_pll)
+		dss_video_pll_uninit(dss->video1_pll);
+	if (dss->video2_pll)
+		dss_video_pll_uninit(dss->video2_pll);
 
 err_put_clocks:
-	dss_put_clocks();
+	dss_put_clocks(dss);
+
+err_free_dss:
+	kfree(dss);
 
 	return r;
 }
 
 static int dss_remove(struct platform_device *pdev)
 {
+	struct dss_device *dss = platform_get_drvdata(pdev);
+
 	component_master_del(&pdev->dev, &dss_component_ops);
 
 	dss_uninitialize_debugfs();
 
 	pm_runtime_disable(&pdev->dev);
 
-	dss_uninit_ports(pdev);
+	dss_uninit_ports(dss);
+
+	if (dss->video1_pll)
+		dss_video_pll_uninit(dss->video1_pll);
 
-	if (dss.video1_pll)
-		dss_video_pll_uninit(dss.video1_pll);
+	if (dss->video2_pll)
+		dss_video_pll_uninit(dss->video2_pll);
 
-	if (dss.video2_pll)
-		dss_video_pll_uninit(dss.video2_pll);
+	dss_put_clocks(dss);
 
-	dss_put_clocks();
+	kfree(dss);
 
 	return 0;
 }
@@ -1496,7 +1524,9 @@ static void dss_shutdown(struct platform_device *pdev)
 
 static int dss_runtime_suspend(struct device *dev)
 {
-	dss_save_context();
+	struct dss_device *dss = dev_get_drvdata(dev);
+
+	dss_save_context(dss);
 	dss_set_min_bus_tput(dev, 0);
 
 	pinctrl_pm_select_sleep_state(dev);
@@ -1506,6 +1536,7 @@ static int dss_runtime_suspend(struct device *dev)
 
 static int dss_runtime_resume(struct device *dev)
 {
+	struct dss_device *dss = dev_get_drvdata(dev);
 	int r;
 
 	pinctrl_pm_select_default_state(dev);
@@ -1521,7 +1552,7 @@ static int dss_runtime_resume(struct device *dev)
 	if (r)
 		return r;
 
-	dss_restore_context();
+	dss_restore_context(dss);
 	return 0;
 }