Merge tag 'v4.14-rockchip-clk1' of...

Merge tag 'v4.14-rockchip-clk1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip into clk-next

Pull Rockchip clk driver updates from Heiko Stuebner:

The biggest change is fixing the jitter on the fractional clock-type
Rockchip socs experience with the default approximation. For that we
introduce the ability to override it with a clock-specific approximation
and use that to create the needed rate settings as described in the
Rockchip soc manuals (same for all Rockchip socs).

Apart from that we have support for the rk3126 clock controller
which is similar to the rk3128 with some minimal differences
and a lot of improvements and fixes for the rv1108 clock controller
(missing clocks, some clock-ids, naming fixes, register fixes).

* tag 'v4.14-rockchip-clk1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
  clk: rockchip: fix the rv1108 clk_mac sel register description
  clk: rockchip: rename rv1108 macphy clock to mac
  clk: rockchip: add rv1108 ACLK_GMAC and PCLK_GMAC clocks
  clk: rockchip: add rk3228 SCLK_SDIO_SRC clk id
  clk: rockchip: add rv1108 ACLK_GAMC and PCLK_GMAC ID
  clk: rockchip: add rk3228 sclk_sdio_src ID
  clk: rockchip: add special approximation to fix up fractional clk's jitter
  clk: fractional-divider: allow overriding of approximation
  clk: rockchip: modify rk3128 clk driver to also support rk3126
  dt-bindings: add documentation for rk3126 clock
  clk: rockchip: add some critical clocks for rv1108 SoC
  clk: rockchip: rename some of clks for rv1108 SoC
  clk: rockchip: fix up some clks describe error for rv1108 SoC
  clk: rockchip: support more clks for rv1108
  clk: rockchip: fix up the pll clks error for rv1108 SoC
  clk: rockchip: support more rates for rv1108 cpuclk
  clk: rockchip: fix up indentation of some RV1108 clock-ids
  clk: rockchip: rename the clk id for HCLK_I2S1_2CH
  clk: rockchip: add more clk ids for rv1108

Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt

-* Rockchip RK3128 Clock and Reset Unit
+* Rockchip RK3126/RK3128 Clock and Reset Unit
 
-The RK3128 clock controller generates and supplies clock to various
+The RK3126/RK3128 clock controller generates and supplies clock to various
 controllers within the SoC and also implements a reset controller for SoC
 peripherals.
 
 Required Properties:
 
-- compatible: should be "rockchip,rk3128-cru"
+- compatible: should be "rockchip,rk3126-cru" or "rockchip,rk3128-cru"
+  "rockchip,rk3126-cru" - controller compatible with RK3126 SoC.
+  "rockchip,rk3128-cru" - controller compatible with RK3128 SoC.
 - reg: physical base address of the controller and length of memory mapped
   region.
 - #clock-cells: should be 1.

drivers/clk/clk-fractional-divider.c

@@ -49,16 +49,12 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw,
 	return ret;
 }
 
-static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
-			      unsigned long *parent_rate)
+static void clk_fd_general_approximation(struct clk_hw *hw, unsigned long rate,
+					 unsigned long *parent_rate,
+					 unsigned long *m, unsigned long *n)
 {
 	struct clk_fractional_divider *fd = to_clk_fd(hw);
 	unsigned long scale;
-	unsigned long m, n;
-	u64 ret;
-
-	if (!rate || rate >= *parent_rate)
-		return *parent_rate;
 
 	/*
 	 * Get rate closer to *parent_rate to guarantee there is no overflow
@@ -71,7 +67,23 @@ static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	rational_best_approximation(rate, *parent_rate,
 			GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0),
-			&m, &n);
+			m, n);
+}
+
+static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
+			      unsigned long *parent_rate)
+{
+	struct clk_fractional_divider *fd = to_clk_fd(hw);
+	unsigned long m, n;
+	u64 ret;
+
+	if (!rate || rate >= *parent_rate)
+		return *parent_rate;
+
+	if (fd->approximation)
+		fd->approximation(hw, rate, parent_rate, &m, &n);
+	else
+		clk_fd_general_approximation(hw, rate, parent_rate, &m, &n);
 
 	ret = (u64)*parent_rate * m;
 	do_div(ret, n);

drivers/clk/rockchip/clk-rk3128.c

@@ -201,7 +201,7 @@ static struct rockchip_clk_branch rk3128_uart2_fracmux __initdata =
 	MUX(SCLK_UART2, "sclk_uart2", mux_uart2_p, CLK_SET_RATE_PARENT,
 			RK2928_CLKSEL_CON(15), 8, 2, MFLAGS);
 
-static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
+static struct rockchip_clk_branch common_clk_branches[] __initdata = {
 	/*
 	 * Clock-Architecture Diagram 1
 	 */
@@ -459,10 +459,6 @@ static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
 			RK2928_CLKSEL_CON(2), 14, 2, MFLAGS, 8, 5, DFLAGS,
 			RK2928_CLKGATE_CON(10), 15, GFLAGS),
 
-	COMPOSITE(SCLK_SFC, "sclk_sfc", mux_sclk_sfc_src_p, 0,
-			RK2928_CLKSEL_CON(11), 14, 2, MFLAGS, 8, 5, DFLAGS,
-			RK2928_CLKGATE_CON(3), 15, GFLAGS),
-
 	COMPOSITE_NOMUX(PCLK_PMU_PRE, "pclk_pmu_pre", "cpll", 0,
 			RK2928_CLKSEL_CON(29), 8, 6, DFLAGS,
 			RK2928_CLKGATE_CON(1), 0, GFLAGS),
@@ -495,7 +491,6 @@ static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
 	GATE(ACLK_DMAC, "aclk_dmac", "aclk_peri", 0, RK2928_CLKGATE_CON(5), 1, GFLAGS),
 	GATE(0, "aclk_peri_niu", "aclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(9), 15, GFLAGS),
 	GATE(0, "aclk_cpu_to_peri", "aclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(4), 2, GFLAGS),
-	GATE(HCLK_GPS, "hclk_gps", "aclk_peri", 0, RK2928_CLKGATE_CON(3), 14, GFLAGS),
 
 	GATE(HCLK_I2S_8CH, "hclk_i2s_8ch", "hclk_peri", 0, RK2928_CLKGATE_CON(7), 4, GFLAGS),
 	GATE(0, "hclk_peri_matrix", "hclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(4), 0, GFLAGS),
@@ -541,7 +536,6 @@ static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
 	GATE(0, "hclk_rom", "hclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(5), 6, GFLAGS),
 	GATE(HCLK_CRYPTO, "hclk_crypto", "hclk_cpu", 0, RK2928_CLKGATE_CON(3), 5, GFLAGS),
 
-	GATE(PCLK_HDMI, "pclk_hdmi", "pclk_cpu", 0, RK2928_CLKGATE_CON(3), 8, GFLAGS),
 	GATE(PCLK_ACODEC, "pclk_acodec", "pclk_cpu", 0, RK2928_CLKGATE_CON(5), 14, GFLAGS),
 	GATE(0, "pclk_ddrupctl", "pclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(5), 7, GFLAGS),
 	GATE(0, "pclk_grf", "pclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(5), 4, GFLAGS),
@@ -561,6 +555,21 @@ static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
 	MMC(SCLK_EMMC_SAMPLE,  "emmc_sample",  "sclk_emmc",  RK3228_EMMC_CON1,  0),
 };
 
+static struct rockchip_clk_branch rk3126_clk_branches[] __initdata = {
+	GATE(0, "pclk_stimer", "pclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(3), 15, GFLAGS),
+	GATE(0, "pclk_s_efuse", "pclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(3), 14, GFLAGS),
+	GATE(0, "pclk_sgrf", "pclk_cpu", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(3), 8, GFLAGS),
+};
+
+static struct rockchip_clk_branch rk3128_clk_branches[] __initdata = {
+	COMPOSITE(SCLK_SFC, "sclk_sfc", mux_sclk_sfc_src_p, 0,
+			RK2928_CLKSEL_CON(11), 14, 2, MFLAGS, 8, 5, DFLAGS,
+			RK2928_CLKGATE_CON(3), 15, GFLAGS),
+
+	GATE(HCLK_GPS, "hclk_gps", "aclk_peri", 0, RK2928_CLKGATE_CON(3), 14, GFLAGS),
+	GATE(PCLK_HDMI, "pclk_hdmi", "pclk_cpu", 0, RK2928_CLKGATE_CON(3), 8, GFLAGS),
+};
+
 static const char *const rk3128_critical_clocks[] __initconst = {
 	"aclk_cpu",
 	"hclk_cpu",
@@ -570,7 +579,7 @@ static const char *const rk3128_critical_clocks[] __initconst = {
 	"pclk_peri",
 };
 
-static void __init rk3128_clk_init(struct device_node *np)
+static struct rockchip_clk_provider *__init rk3128_common_clk_init(struct device_node *np)
 {
 	struct rockchip_clk_provider *ctx;
 	void __iomem *reg_base;
@@ -578,23 +587,21 @@ static void __init rk3128_clk_init(struct device_node *np)
 	reg_base = of_iomap(np, 0);
 	if (!reg_base) {
 		pr_err("%s: could not map cru region\n", __func__);
-		return;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	ctx = rockchip_clk_init(np, reg_base, CLK_NR_CLKS);
 	if (IS_ERR(ctx)) {
 		pr_err("%s: rockchip clk init failed\n", __func__);
 		iounmap(reg_base);
-		return;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	rockchip_clk_register_plls(ctx, rk3128_pll_clks,
 				   ARRAY_SIZE(rk3128_pll_clks),
 				   RK3128_GRF_SOC_STATUS0);
-	rockchip_clk_register_branches(ctx, rk3128_clk_branches,
-				  ARRAY_SIZE(rk3128_clk_branches));
-	rockchip_clk_protect_critical(rk3128_critical_clocks,
-				      ARRAY_SIZE(rk3128_critical_clocks));
+	rockchip_clk_register_branches(ctx, common_clk_branches,
+				  ARRAY_SIZE(common_clk_branches));
 
 	rockchip_clk_register_armclk(ctx, ARMCLK, "armclk",
 			mux_armclk_p, ARRAY_SIZE(mux_armclk_p),
@@ -606,6 +613,40 @@ static void __init rk3128_clk_init(struct device_node *np)
 
 	rockchip_register_restart_notifier(ctx, RK2928_GLB_SRST_FST, NULL);
 
+	return ctx;
+}
+
+static void __init rk3126_clk_init(struct device_node *np)
+{
+	struct rockchip_clk_provider *ctx;
+
+	ctx = rk3128_common_clk_init(np);
+	if (IS_ERR(ctx))
+		return;
+
+	rockchip_clk_register_branches(ctx, rk3126_clk_branches,
+				       ARRAY_SIZE(rk3126_clk_branches));
+	rockchip_clk_protect_critical(rk3128_critical_clocks,
+				      ARRAY_SIZE(rk3128_critical_clocks));
+
+	rockchip_clk_of_add_provider(np, ctx);
+}
+
+CLK_OF_DECLARE(rk3126_cru, "rockchip,rk3126-cru", rk3126_clk_init);
+
+static void __init rk3128_clk_init(struct device_node *np)
+{
+	struct rockchip_clk_provider *ctx;
+
+	ctx = rk3128_common_clk_init(np);
+	if (IS_ERR(ctx))
+		return;
+
+	rockchip_clk_register_branches(ctx, rk3128_clk_branches,
+				       ARRAY_SIZE(rk3128_clk_branches));
+	rockchip_clk_protect_critical(rk3128_critical_clocks,
+				      ARRAY_SIZE(rk3128_critical_clocks));
+
 	rockchip_clk_of_add_provider(np, ctx);
 }
 

drivers/clk/rockchip/clk-rk3228.c

@@ -391,7 +391,7 @@ static struct rockchip_clk_branch rk3228_clk_branches[] __initdata = {
 			RK2928_CLKSEL_CON(11), 8, 2, MFLAGS, 0, 8, DFLAGS,
 			RK2928_CLKGATE_CON(2), 11, GFLAGS),
 
-	COMPOSITE_NODIV(0, "sclk_sdio_src", mux_mmc_src_p, 0,
+	COMPOSITE_NODIV(SCLK_SDIO_SRC, "sclk_sdio_src", mux_mmc_src_p, 0,
 			RK2928_CLKSEL_CON(11), 10, 2, MFLAGS,
 			RK2928_CLKGATE_CON(2), 13, GFLAGS),
 	DIV(SCLK_SDIO, "sclk_sdio", "sclk_sdio_src", 0,

drivers/clk/rockchip/clk.c

@@ -29,6 +29,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/reboot.h>
+#include <linux/rational.h>
 #include "clk.h"
 
 /**
@@ -164,6 +165,40 @@ static int rockchip_clk_frac_notifier_cb(struct notifier_block *nb,
 	return notifier_from_errno(ret);
 }
 
+/**
+ * fractional divider must set that denominator is 20 times larger than
+ * numerator to generate precise clock frequency.
+ */
+void rockchip_fractional_approximation(struct clk_hw *hw,
+		unsigned long rate, unsigned long *parent_rate,
+		unsigned long *m, unsigned long *n)
+{
+	struct clk_fractional_divider *fd = to_clk_fd(hw);
+	unsigned long p_rate, p_parent_rate;
+	struct clk_hw *p_parent;
+	unsigned long scale;
+
+	p_rate = clk_hw_get_rate(clk_hw_get_parent(hw));
+	if ((rate * 20 > p_rate) && (p_rate % rate != 0)) {
+		p_parent = clk_hw_get_parent(clk_hw_get_parent(hw));
+		p_parent_rate = clk_hw_get_rate(p_parent);
+		*parent_rate = p_parent_rate;
+	}
+
+	/*
+	 * Get rate closer to *parent_rate to guarantee there is no overflow
+	 * for m and n. In the result it will be the nearest rate left shifted
+	 * by (scale - fd->nwidth) bits.
+	 */
+	scale = fls_long(*parent_rate / rate - 1);
+	if (scale > fd->nwidth)
+		rate <<= scale - fd->nwidth;
+
+	rational_best_approximation(rate, *parent_rate,
+			GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0),
+			m, n);
+}
+
 static struct clk *rockchip_clk_register_frac_branch(
 		struct rockchip_clk_provider *ctx, const char *name,
 		const char *const *parent_names, u8 num_parents,
@@ -210,6 +245,7 @@ static struct clk *rockchip_clk_register_frac_branch(
 	div->nwidth = 16;
 	div->nmask = GENMASK(div->nwidth - 1, 0) << div->nshift;
 	div->lock = lock;
+	div->approximation = rockchip_fractional_approximation;
 	div_ops = &clk_fractional_divider_ops;
 
 	clk = clk_register_composite(NULL, name, parent_names, num_parents,

include/dt-bindings/clock/rk3228-cru.h

@@ -49,6 +49,7 @@
 #define SCLK_EMMC_DRV		117
 #define SCLK_SDMMC_SAMPLE	118
 #define SCLK_SDIO_SAMPLE	119
+#define SCLK_SDIO_SRC		120
 #define SCLK_EMMC_SAMPLE	121
 #define SCLK_VOP		122
 #define SCLK_HDMI_HDCP		123

include/dt-bindings/clock/rv1108-cru.h

@@ -43,12 +43,74 @@
 #define SCLK_SDMMC_SAMPLE		84
 #define SCLK_SDIO_SAMPLE		85
 #define SCLK_EMMC_SAMPLE		86
+#define SCLK_VENC_CORE			87
+#define SCLK_HEVC_CORE			88
+#define SCLK_HEVC_CABAC			89
+#define SCLK_PWM0_PMU			90
+#define SCLK_I2C0_PMU			91
+#define SCLK_WIFI			92
+#define SCLK_CIFOUT			93
+#define SCLK_MIPI_CSI_OUT		94
+#define SCLK_CIF0			95
+#define SCLK_CIF1			96
+#define SCLK_CIF2			97
+#define SCLK_CIF3			98
+#define SCLK_DSP			99
+#define SCLK_DSP_IOP			100
+#define SCLK_DSP_EPP			101
+#define SCLK_DSP_EDP			102
+#define SCLK_DSP_EDAP			103
+#define SCLK_CVBS_HOST			104
+#define SCLK_HDMI_SFR			105
+#define SCLK_HDMI_CEC			106
+#define SCLK_CRYPTO			107
+#define SCLK_SPI			108
+#define SCLK_SARADC			109
+#define SCLK_TSADC			110
+#define SCLK_MAC_PRE			111
+#define SCLK_MAC			112
+#define SCLK_MAC_RX			113
+#define SCLK_MAC_REF			114
+#define SCLK_MAC_REFOUT			115
+#define SCLK_DSP_PFM			116
+#define SCLK_RGA			117
+#define SCLK_I2C1			118
+#define SCLK_I2C2			119
+#define SCLK_I2C3			120
+#define SCLK_PWM			121
+#define SCLK_ISP			122
+#define SCLK_USBPHY			123
+#define SCLK_I2S0_SRC			124
+#define SCLK_I2S1_SRC			125
+#define SCLK_I2S2_SRC			126
+#define SCLK_UART0_SRC			127
+#define SCLK_UART1_SRC			128
+#define SCLK_UART2_SRC			129
+
+#define DCLK_VOP_SRC			185
+#define DCLK_HDMIPHY			186
+#define DCLK_VOP			187
 
 /* aclk gates */
 #define ACLK_DMAC			192
 #define ACLK_PRE			193
 #define ACLK_CORE			194
 #define ACLK_ENMCORE			195
+#define ACLK_RKVENC			196
+#define ACLK_RKVDEC			197
+#define ACLK_VPU			198
+#define ACLK_CIF0			199
+#define ACLK_VIO0			200
+#define ACLK_VIO1			201
+#define ACLK_VOP			202
+#define ACLK_IEP			203
+#define ACLK_RGA			204
+#define ACLK_ISP			205
+#define ACLK_CIF1			206
+#define ACLK_CIF2			207
+#define ACLK_CIF3			208
+#define ACLK_PERI			209
+#define ACLK_GMAC			210
 
 /* pclk gates */
 #define PCLK_GPIO1			256
@@ -67,10 +129,24 @@
 #define PCLK_PWM			269
 #define PCLK_TIMER			270
 #define PCLK_PERI			271
+#define PCLK_GPIO0_PMU			272
+#define PCLK_I2C0_PMU			273
+#define PCLK_PWM0_PMU			274
+#define PCLK_ISP			275
+#define PCLK_VIO			276
+#define PCLK_MIPI_DSI			277
+#define PCLK_HDMI_CTRL			278
+#define PCLK_SARADC			279
+#define PCLK_DSP_CFG			280
+#define PCLK_BUS			281
+#define PCLK_EFUSE0			282
+#define PCLK_EFUSE1			283
+#define PCLK_WDT			284
+#define PCLK_GMAC			285
 
 /* hclk gates */
 #define HCLK_I2S0_8CH			320
-#define HCLK_I2S1_8CH			321
+#define HCLK_I2S1_2CH			321
 #define HCLK_I2S2_2CH			322
 #define HCLK_NANDC			323
 #define HCLK_SDMMC			324
@@ -78,20 +154,37 @@
 #define HCLK_EMMC			326
 #define HCLK_PERI			327
 #define HCLK_SFC			328
+#define HCLK_RKVENC			329
+#define HCLK_RKVDEC			330
+#define HCLK_CIF0			331
+#define HCLK_VIO			332
+#define HCLK_VOP			333
+#define HCLK_IEP			334
+#define HCLK_RGA			335
+#define HCLK_ISP			336
+#define HCLK_CRYPTO_MST			337
+#define HCLK_CRYPTO_SLV			338
+#define HCLK_HOST0			339
+#define HCLK_OTG			340
+#define HCLK_CIF1			341
+#define HCLK_CIF2			342
+#define HCLK_CIF3			343
+#define HCLK_BUS			344
+#define HCLK_VPU			345
 
-#define CLK_NR_CLKS			(HCLK_SFC + 1)
+#define CLK_NR_CLKS			(HCLK_VPU + 1)
 
 /* reset id */
-#define SRST_CORE_PO_AD		0
+#define SRST_CORE_PO_AD			0
 #define SRST_CORE_AD			1
 #define SRST_L2_AD			2
-#define SRST_CPU_NIU_AD		3
+#define SRST_CPU_NIU_AD			3
 #define SRST_CORE_PO			4
 #define SRST_CORE			5
-#define SRST_L2			6
+#define SRST_L2				6
 #define SRST_CORE_DBG			8
 #define PRST_DBG			9
-#define RST_DAP			10
+#define RST_DAP				10
 #define PRST_DBG_NIU			11
 #define ARST_STRC_SYS_AD		15
 
@@ -158,9 +251,9 @@
 #define HRST_SYSBUS			75
 #define PRST_USBGRF			76
 
-#define ARST_PERIPH_NIU		80
-#define HRST_PERIPH_NIU		81
-#define PRST_PERIPH_NIU		82
+#define ARST_PERIPH_NIU			80
+#define HRST_PERIPH_NIU			81
+#define PRST_PERIPH_NIU			82
 #define HRST_PERIPH			83
 #define HRST_SDMMC			84
 #define HRST_SDIO			85
@@ -178,7 +271,7 @@
 #define HRST_HOST0_AUX			96
 #define HRST_HOST0_ARB			97
 #define SRST_HOST0_EHCIPHY		98
-#define SRST_HOST0_UTMI		99
+#define SRST_HOST0_UTMI			99
 #define SRST_USBPOR			100
 #define SRST_UTMI0			101
 #define SRST_UTMI1			102
@@ -225,21 +318,21 @@
 #define HRST_VPU_NIU			141
 #define ARST_VPU			142
 #define HRST_VPU			143
-#define ARST_RKVDEC_NIU		144
-#define HRST_RKVDEC_NIU		145
+#define ARST_RKVDEC_NIU			144
+#define HRST_RKVDEC_NIU			145
 #define ARST_RKVDEC			146
 #define HRST_RKVDEC			147
 #define SRST_RKVDEC_CABAC		148
 #define SRST_RKVDEC_CORE		149
-#define ARST_RKVENC_NIU		150
-#define HRST_RKVENC_NIU		151
+#define ARST_RKVENC_NIU			150
+#define HRST_RKVENC_NIU			151
 #define ARST_RKVENC			152
 #define HRST_RKVENC			153
 #define SRST_RKVENC_CORE		154
 
 #define SRST_DSP_CORE			156
 #define SRST_DSP_SYS			157
-#define SRST_DSP_GLOBAL		158
+#define SRST_DSP_GLOBAL			158
 #define SRST_DSP_OECM			159
 #define PRST_DSP_IOP_NIU		160
 #define ARST_DSP_EPP_NIU		161
@@ -257,7 +350,7 @@
 #define SRST_PMU_I2C0			173
 #define PRST_PMU_I2C0			174
 #define PRST_PMU_GPIO0			175
-#define PRST_PMU_INTMEM		176
+#define PRST_PMU_INTMEM			176
 #define PRST_PMU_PWM0			177
 #define SRST_PMU_PWM0			178
 #define PRST_PMU_GRF			179

include/linux/clk-provider.h

@@ -565,6 +565,9 @@ struct clk_fractional_divider {
 	u8		nwidth;
 	u32		nmask;
 	u8		flags;
+	void		(*approximation)(struct clk_hw *hw,
+				unsigned long rate, unsigned long *parent_rate,
+				unsigned long *m, unsigned long *n);
 	spinlock_t	*lock;
 };