Merge branches 'clk-at91', 'clk-imx7ulp', 'clk-axigen', 'clk-si5351' and 'clk-pxa' into clk-next

* clk-at91:
  clk: at91: pmc: Support backup for programmable clocks
  clk: at91: pmc: Save SCSR during suspend
  clk: at91: pmc: Wait for clocks when resuming

* clk-imx7ulp:
  clk: Don't touch hardware when reparenting during registration

* clk-axigen:
  clk: axi-clkgen: Round closest in round_rate() and recalc_rate()
  clk: axi-clkgen: Correctly handle nocount bit in recalc_rate()

* clk-si5351:
  clk: si5351: _si5351_clkout_reset_pll() can be static
  clk: si5351: Do not enable parent clocks on probe
  clk: si5351: Rename internal plls to avoid name collisions
  clk: si5351: Apply PLL soft reset before enabling the outputs
  clk: si5351: Add DT property to enable PLL reset
  clk: si5351: implement remove handler

* clk-pxa:
  clk: pxa: unbreak lookup of CLK_POUT

Documentation/devicetree/bindings/clock/silabs,si5351.txt

@@ -49,6 +49,7 @@ Optional child node properties:
 - silabs,multisynth-source: source pll A(0) or B(1) of corresponding multisynth
   divider.
 - silabs,pll-master: boolean, multisynth can change pll frequency.
+- silabs,pll-reset: boolean, clock output can reset its pll.
 - silabs,disable-state : clock output disable state, shall be
   0 = clock output is driven LOW when disabled
   1 = clock output is driven HIGH when disabled

drivers/clk/at91/clk-programmable.c

@@ -204,6 +204,8 @@ at91_clk_register_programmable(struct regmap *regmap,
 	if (ret) {
 		kfree(prog);
 		hw = ERR_PTR(ret);
+	} else {
+		pmc_register_pck(id);
 	}
 
 	return hw;

drivers/clk/at91/pmc.c

@@ -22,6 +22,7 @@
 #include "pmc.h"
 
 #define PMC_MAX_IDS 128
+#define PMC_MAX_PCKS 8
 
 int of_at91_get_clk_range(struct device_node *np, const char *propname,
 			  struct clk_range *range)
@@ -50,6 +51,7 @@ EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
 static struct regmap *pmcreg;
 
 static u8 registered_ids[PMC_MAX_IDS];
+static u8 registered_pcks[PMC_MAX_PCKS];
 
 static struct
 {
@@ -66,8 +68,13 @@ static struct
 	u32 pcr[PMC_MAX_IDS];
 	u32 audio_pll0;
 	u32 audio_pll1;
+	u32 pckr[PMC_MAX_PCKS];
 } pmc_cache;
 
+/*
+ * As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
+ * without alteration in the table, and 0 is for unused clocks.
+ */
 void pmc_register_id(u8 id)
 {
 	int i;
@@ -82,11 +89,30 @@ void pmc_register_id(u8 id)
 	}
 }
 
+/*
+ * As Programmable Clock 0 is valid on AT91 chips, there is an offset
+ * of 1 between the stored value and the real clock ID.
+ */
+void pmc_register_pck(u8 pck)
+{
+	int i;
+
+	for (i = 0; i < PMC_MAX_PCKS; i++) {
+		if (registered_pcks[i] == 0) {
+			registered_pcks[i] = pck + 1;
+			break;
+		}
+		if (registered_pcks[i] == (pck + 1))
+			break;
+	}
+}
+
 static int pmc_suspend(void)
 {
 	int i;
+	u8 num;
 
-	regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr);
+	regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
 	regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
 	regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
 	regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
@@ -103,14 +129,29 @@ static int pmc_suspend(void)
 		regmap_read(pmcreg, AT91_PMC_PCR,
 			    &pmc_cache.pcr[registered_ids[i]]);
 	}
+	for (i = 0; registered_pcks[i]; i++) {
+		num = registered_pcks[i] - 1;
+		regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
+	}
 
 	return 0;
 }
 
+static bool pmc_ready(unsigned int mask)
+{
+	unsigned int status;
+
+	regmap_read(pmcreg, AT91_PMC_SR, &status);
+
+	return ((status & mask) == mask) ? 1 : 0;
+}
+
 static void pmc_resume(void)
 {
-	int i, ret = 0;
+	int i;
+	u8 num;
 	u32 tmp;
+	u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
 
 	regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
 	if (pmc_cache.mckr != tmp)
@@ -119,7 +160,7 @@ static void pmc_resume(void)
 	if (pmc_cache.pllar != tmp)
 		pr_warn("PLLAR was not configured properly by the firmware\n");
 
-	regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr);
+	regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
 	regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
 	regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
 	regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
@@ -133,14 +174,16 @@ static void pmc_resume(void)
 			     pmc_cache.pcr[registered_ids[i]] |
 			     AT91_PMC_PCR_CMD);
 	}
-
-	if (pmc_cache.uckr & AT91_PMC_UPLLEN) {
-		ret = regmap_read_poll_timeout(pmcreg, AT91_PMC_SR, tmp,
-					       !(tmp & AT91_PMC_LOCKU),
-					       10, 5000);
-		if (ret)
-			pr_crit("USB PLL didn't lock when resuming\n");
+	for (i = 0; registered_pcks[i]; i++) {
+		num = registered_pcks[i] - 1;
+		regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
 	}
+
+	if (pmc_cache.uckr & AT91_PMC_UPLLEN)
+		mask |= AT91_PMC_LOCKU;
+
+	while (!pmc_ready(mask))
+		cpu_relax();
 }
 
 static struct syscore_ops pmc_syscore_ops = {

drivers/clk/at91/pmc.h

@@ -31,8 +31,10 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname,
 
 #ifdef CONFIG_PM
 void pmc_register_id(u8 id);
+void pmc_register_pck(u8 pck);
 #else
 static inline void pmc_register_id(u8 id) {}
+static inline void pmc_register_pck(u8 pck) {}
 #endif
 
 #endif /* __PMC_H_ */

drivers/clk/clk-axi-clkgen.c

@@ -40,6 +40,10 @@
 #define MMCM_REG_FILTER1	0x4e
 #define MMCM_REG_FILTER2	0x4f
 
+#define MMCM_CLKOUT_NOCOUNT	BIT(6)
+
+#define MMCM_CLK_DIV_NOCOUNT	BIT(12)
+
 struct axi_clkgen {
 	void __iomem *base;
 	struct clk_hw clk_hw;
@@ -298,13 +302,17 @@ static long axi_clkgen_round_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned long *parent_rate)
 {
 	unsigned int d, m, dout;
+	unsigned long long tmp;
 
 	axi_clkgen_calc_params(*parent_rate, rate, &d, &m, &dout);
 
 	if (d == 0 || dout == 0 || m == 0)
 		return -EINVAL;
 
-	return *parent_rate / d * m / dout;
+	tmp = (unsigned long long)*parent_rate * m;
+	tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d);
+
+	return min_t(unsigned long long, tmp, LONG_MAX);
 }
 
 static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
@@ -315,18 +323,33 @@ static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
 	unsigned int reg;
 	unsigned long long tmp;
 
-	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLKOUT0_1, &reg);
-	dout = (reg & 0x3f) + ((reg >> 6) & 0x3f);
+	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLKOUT0_2, &reg);
+	if (reg & MMCM_CLKOUT_NOCOUNT) {
+		dout = 1;
+	} else {
+		axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLKOUT0_1, &reg);
+		dout = (reg & 0x3f) + ((reg >> 6) & 0x3f);
+	}
+
 	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_DIV, &reg);
-	d = (reg & 0x3f) + ((reg >> 6) & 0x3f);
-	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_FB1, &reg);
-	m = (reg & 0x3f) + ((reg >> 6) & 0x3f);
+	if (reg & MMCM_CLK_DIV_NOCOUNT)
+		d = 1;
+	else
+		d = (reg & 0x3f) + ((reg >> 6) & 0x3f);
+
+	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_FB2, &reg);
+	if (reg & MMCM_CLKOUT_NOCOUNT) {
+		m = 1;
+	} else {
+		axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_FB1, &reg);
+		m = (reg & 0x3f) + ((reg >> 6) & 0x3f);
+	}
 
 	if (d == 0 || dout == 0)
 		return 0;
 
-	tmp = (unsigned long long)(parent_rate / d) * m;
-	do_div(tmp, dout);
+	tmp = (unsigned long long)parent_rate * m;
+	tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d);
 
 	return min_t(unsigned long long, tmp, ULONG_MAX);
 }

drivers/clk/clk-si5351.c

@@ -72,7 +72,7 @@ static const char * const si5351_input_names[] = {
 	"xtal", "clkin"
 };
 static const char * const si5351_pll_names[] = {
-	"plla", "pllb", "vxco"
+	"si5351_plla", "si5351_pllb", "si5351_vxco"
 };
 static const char * const si5351_msynth_names[] = {
 	"ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7"
@@ -903,13 +903,42 @@ static int _si5351_clkout_set_disable_state(
 	return 0;
 }
 
+static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
+{
+	u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
+
+	switch (val & SI5351_CLK_INPUT_MASK) {
+	case SI5351_CLK_INPUT_XTAL:
+	case SI5351_CLK_INPUT_CLKIN:
+		return;  /* pll not used, no need to reset */
+	}
+
+	si5351_reg_write(drvdata, SI5351_PLL_RESET,
+			 val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
+						       SI5351_PLL_RESET_A);
+
+	dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
+		__func__, clk_hw_get_name(&drvdata->clkout[num].hw),
+		(val & SI5351_CLK_PLL_SELECT) ? 1 : 0);
+}
+
 static int si5351_clkout_prepare(struct clk_hw *hw)
 {
 	struct si5351_hw_data *hwdata =
 		container_of(hw, struct si5351_hw_data, hw);
+	struct si5351_platform_data *pdata =
+		hwdata->drvdata->client->dev.platform_data;
 
 	si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 			SI5351_CLK_POWERDOWN, 0);
+
+	/*
+	 * Do a pll soft reset on the parent pll -- needed to get a
+	 * deterministic phase relationship between the output clocks.
+	 */
+	if (pdata->clkout[hwdata->num].pll_reset)
+		_si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num);
+
 	si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 			(1 << hwdata->num), 0);
 	return 0;
@@ -1297,6 +1326,9 @@ static int si5351_dt_parse(struct i2c_client *client,
 
 		pdata->clkout[num].pll_master =
 			of_property_read_bool(child, "silabs,pll-master");
+
+		pdata->clkout[num].pll_reset =
+			of_property_read_bool(child, "silabs,pll-reset");
 	}
 	client->dev.platform_data = pdata;
 
@@ -1437,11 +1469,6 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		}
 	}
 
-	if (!IS_ERR(drvdata->pxtal))
-		clk_prepare_enable(drvdata->pxtal);
-	if (!IS_ERR(drvdata->pclkin))
-		clk_prepare_enable(drvdata->pclkin);
-
 	/* register xtal input clock gate */
 	memset(&init, 0, sizeof(init));
 	init.name = si5351_input_names[0];
@@ -1456,7 +1483,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->xtal);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register clkin input clock gate */
@@ -1474,7 +1501,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 	}
 
@@ -1496,7 +1523,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register PLLB or VXCO (Si5351B) */
@@ -1520,7 +1547,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register clk multisync and clk out divider */
@@ -1539,7 +1566,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 
 	if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) {
 		ret = -ENOMEM;
-		goto err_clk;
+		return ret;
 	}
 
 	for (n = 0; n < num_clocks; n++) {
@@ -1559,7 +1586,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 	}
 
@@ -1587,7 +1614,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 
 		/* set initial clkout rate */
@@ -1606,17 +1633,17 @@ static int si5351_i2c_probe(struct i2c_client *client,
 				     drvdata);
 	if (ret) {
 		dev_err(&client->dev, "unable to add clk provider\n");
-		goto err_clk;
+		return ret;
 	}
 
 	return 0;
+}
 
-err_clk:
-	if (!IS_ERR(drvdata->pxtal))
-		clk_disable_unprepare(drvdata->pxtal);
-	if (!IS_ERR(drvdata->pclkin))
-		clk_disable_unprepare(drvdata->pclkin);
-	return ret;
+static int si5351_i2c_remove(struct i2c_client *client)
+{
+	of_clk_del_provider(client->dev.of_node);
+
+	return 0;
 }
 
 static const struct i2c_device_id si5351_i2c_ids[] = {
@@ -1634,6 +1661,7 @@ static struct i2c_driver si5351_driver = {
 		.of_match_table = of_match_ptr(si5351_dt_ids),
 	},
 	.probe = si5351_i2c_probe,
+	.remove = si5351_i2c_remove,
 	.id_table = si5351_i2c_ids,
 };
 module_i2c_driver(si5351_driver);

drivers/clk/clk.c

@@ -2917,14 +2917,17 @@ static int __clk_core_init(struct clk_core *core)
 	 */
 	hlist_for_each_entry_safe(orphan, tmp2, &clk_orphan_list, child_node) {
 		struct clk_core *parent = __clk_init_parent(orphan);
+		unsigned long flags;
 
 		/*
 		 * we could call __clk_set_parent, but that would result in a
 		 * redundant call to the .set_rate op, if it exists
 		 */
 		if (parent) {
-			__clk_set_parent_before(orphan, parent);
-			__clk_set_parent_after(orphan, parent, NULL);
+			/* update the clk tree topology */
+			flags = clk_enable_lock();
+			clk_reparent(orphan, parent);
+			clk_enable_unlock(flags);
 			__clk_recalc_accuracies(orphan);
 			__clk_recalc_rates(orphan, 0);
 		}

drivers/clk/pxa/clk-pxa3xx.c

@@ -329,12 +329,16 @@ static void __init pxa3xx_dummy_clocks_init(void)
 
 static void __init pxa3xx_base_clocks_init(void)
 {
+	struct clk *clk;
+
 	pxa3xx_register_plls();
 	pxa3xx_register_core();
 	clk_register_clk_pxa3xx_system_bus();
 	clk_register_clk_pxa3xx_ac97();
 	clk_register_clk_pxa3xx_smemc();
-	clk_register_gate(NULL, "CLK_POUT", "osc_13mhz", 0, OSCC, 11, 0, NULL);
+	clk = clk_register_gate(NULL, "CLK_POUT",
+				"osc_13mhz", 0, OSCC, 11, 0, NULL);
+	clk_register_clkdev(clk, "CLK_POUT", NULL);
 	clkdev_pxa_register(CLK_OSTIMER, "OSTIMER0", NULL,
 			    clk_register_fixed_factor(NULL, "os-timer0",
 						      "osc_13mhz", 0, 1, 4));

include/linux/platform_data/si5351.h

@@ -86,6 +86,7 @@ enum si5351_disable_state {
  * @multisynth_src: multisynth source clock
  * @clkout_src: clkout source clock
  * @pll_master: if true, clkout can also change pll rate
+ * @pll_reset: if true, clkout can reset its pll
  * @drive: output drive strength
  * @rate: initial clkout rate, or default if 0
  */
@@ -95,6 +96,7 @@ struct si5351_clkout_config {
 	enum si5351_drive_strength drive;
 	enum si5351_disable_state disable_state;
 	bool pll_master;
+	bool pll_reset;
 	unsigned long rate;
 };