rockchip: rk3328: add clock driver

Add rk3328 clock driver and cru structure definition.

Signed-off-by: William Zhang <william.zhang@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

2 files changed, 582 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
index b66e81e..1091a76 100644
--- a/drivers/clk/rockchip/Makefile
+++ b/drivers/clk/rockchip/Makefile
@@ -7,4 +7,5 @@
 obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
 obj-$(CONFIG_ROCKCHIP_RK3188) += clk_rk3188.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
+obj-$(CONFIG_ROCKCHIP_RK3328) += clk_rk3328.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += clk_rk3399.o
diff --git a/drivers/clk/rockchip/clk_rk3328.c b/drivers/clk/rockchip/clk_rk3328.c
new file mode 100644
index 0000000..0ff1e30
--- /dev/null
+++ b/drivers/clk/rockchip/clk_rk3328.c
@@ -0,0 +1,581 @@
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3328.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+#include <dm/lists.h>
+#include <dt-bindings/clock/rk3328-cru.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct pll_div {
+	u32 refdiv;
+	u32 fbdiv;
+	u32 postdiv1;
+	u32 postdiv2;
+	u32 frac;
+};
+
+#define RATE_TO_DIV(input_rate, output_rate) \
+	((input_rate) / (output_rate) - 1);
+#define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))
+
+#define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
+	.refdiv = _refdiv,\
+	.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
+	.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};
+
+static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 4, 1);
+static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 2, 2, 1);
+
+static const struct pll_div apll_816_cfg = PLL_DIVISORS(816 * MHz, 1, 2, 1);
+static const struct pll_div apll_600_cfg = PLL_DIVISORS(600 * MHz, 1, 3, 1);
+
+static const struct pll_div *apll_cfgs[] = {
+	[APLL_816_MHZ] = &apll_816_cfg,
+	[APLL_600_MHZ] = &apll_600_cfg,
+};
+
+enum {
+	/* PLL_CON0 */
+	PLL_POSTDIV1_SHIFT		= 12,
+	PLL_POSTDIV1_MASK		= 0x7 << PLL_POSTDIV1_SHIFT,
+	PLL_FBDIV_SHIFT			= 0,
+	PLL_FBDIV_MASK			= 0xfff,
+
+	/* PLL_CON1 */
+	PLL_DSMPD_SHIFT			= 12,
+	PLL_DSMPD_MASK			= 1 << PLL_DSMPD_SHIFT,
+	PLL_INTEGER_MODE		= 1,
+	PLL_LOCK_STATUS_SHIFT		= 10,
+	PLL_LOCK_STATUS_MASK		= 1 << PLL_LOCK_STATUS_SHIFT,
+	PLL_POSTDIV2_SHIFT		= 6,
+	PLL_POSTDIV2_MASK		= 0x7 << PLL_POSTDIV2_SHIFT,
+	PLL_REFDIV_SHIFT		= 0,
+	PLL_REFDIV_MASK			= 0x3f,
+
+	/* PLL_CON2 */
+	PLL_FRACDIV_SHIFT		= 0,
+	PLL_FRACDIV_MASK		= 0xffffff,
+
+	/* MODE_CON */
+	APLL_MODE_SHIFT			= 0,
+	NPLL_MODE_SHIFT			= 1,
+	DPLL_MODE_SHIFT			= 4,
+	CPLL_MODE_SHIFT			= 8,
+	GPLL_MODE_SHIFT			= 12,
+	PLL_MODE_SLOW			= 0,
+	PLL_MODE_NORM,
+
+	/* CLKSEL_CON0 */
+	CLK_CORE_PLL_SEL_APLL		= 0,
+	CLK_CORE_PLL_SEL_GPLL,
+	CLK_CORE_PLL_SEL_DPLL,
+	CLK_CORE_PLL_SEL_NPLL,
+	CLK_CORE_PLL_SEL_SHIFT		= 6,
+	CLK_CORE_PLL_SEL_MASK		= 3 << CLK_CORE_PLL_SEL_SHIFT,
+	CLK_CORE_DIV_SHIFT		= 0,
+	CLK_CORE_DIV_MASK		= 0x1f,
+
+	/* CLKSEL_CON1 */
+	ACLKM_CORE_DIV_SHIFT		= 4,
+	ACLKM_CORE_DIV_MASK		= 0x7 << ACLKM_CORE_DIV_SHIFT,
+	PCLK_DBG_DIV_SHIFT		= 0,
+	PCLK_DBG_DIV_MASK		= 0xF << PCLK_DBG_DIV_SHIFT,
+
+	/* CLKSEL_CON28 */
+	ACLK_PERIHP_PLL_SEL_CPLL	= 0,
+	ACLK_PERIHP_PLL_SEL_GPLL,
+	ACLK_PERIHP_PLL_SEL_HDMIPHY,
+	ACLK_PERIHP_PLL_SEL_SHIFT	= 6,
+	ACLK_PERIHP_PLL_SEL_MASK	= 3 << ACLK_PERIHP_PLL_SEL_SHIFT,
+	ACLK_PERIHP_DIV_CON_SHIFT	= 0,
+	ACLK_PERIHP_DIV_CON_MASK	= 0x1f,
+
+	/* CLKSEL_CON29 */
+	PCLK_PERIHP_DIV_CON_SHIFT	= 4,
+	PCLK_PERIHP_DIV_CON_MASK	= 0x7 << PCLK_PERIHP_DIV_CON_SHIFT,
+	HCLK_PERIHP_DIV_CON_SHIFT	= 0,
+	HCLK_PERIHP_DIV_CON_MASK	= 3 << HCLK_PERIHP_DIV_CON_SHIFT,
+
+	/* CLKSEL_CON22 */
+	CLK_TSADC_DIV_CON_SHIFT		= 0,
+	CLK_TSADC_DIV_CON_MASK		= 0x3ff,
+
+	/* CLKSEL_CON23 */
+	CLK_SARADC_DIV_CON_SHIFT	= 0,
+	CLK_SARADC_DIV_CON_MASK		= 0x3ff << CLK_SARADC_DIV_CON_SHIFT,
+
+	/* CLKSEL_CON24 */
+	CLK_PWM_PLL_SEL_CPLL		= 0,
+	CLK_PWM_PLL_SEL_GPLL,
+	CLK_PWM_PLL_SEL_SHIFT		= 15,
+	CLK_PWM_PLL_SEL_MASK		= 1 << CLK_PWM_PLL_SEL_SHIFT,
+	CLK_PWM_DIV_CON_SHIFT		= 8,
+	CLK_PWM_DIV_CON_MASK		= 0x7f << CLK_PWM_DIV_CON_SHIFT,
+
+	CLK_SPI_PLL_SEL_CPLL		= 0,
+	CLK_SPI_PLL_SEL_GPLL,
+	CLK_SPI_PLL_SEL_SHIFT		= 7,
+	CLK_SPI_PLL_SEL_MASK		= 1 << CLK_SPI_PLL_SEL_SHIFT,
+	CLK_SPI_DIV_CON_SHIFT		= 0,
+	CLK_SPI_DIV_CON_MASK		= 0x7f << CLK_SPI_DIV_CON_SHIFT,
+
+	/* CLKSEL_CON30 */
+	CLK_SDMMC_PLL_SEL_CPLL		= 0,
+	CLK_SDMMC_PLL_SEL_GPLL,
+	CLK_SDMMC_PLL_SEL_24M,
+	CLK_SDMMC_PLL_SEL_USBPHY,
+	CLK_SDMMC_PLL_SHIFT		= 8,
+	CLK_SDMMC_PLL_MASK		= 0x3 << CLK_SDMMC_PLL_SHIFT,
+	CLK_SDMMC_DIV_CON_SHIFT          = 0,
+	CLK_SDMMC_DIV_CON_MASK           = 0xff << CLK_SDMMC_DIV_CON_SHIFT,
+
+	/* CLKSEL_CON32 */
+	CLK_EMMC_PLL_SEL_CPLL		= 0,
+	CLK_EMMC_PLL_SEL_GPLL,
+	CLK_EMMC_PLL_SEL_24M,
+	CLK_EMMC_PLL_SEL_USBPHY,
+	CLK_EMMC_PLL_SHIFT		= 8,
+	CLK_EMMC_PLL_MASK		= 0x3 << CLK_EMMC_PLL_SHIFT,
+	CLK_EMMC_DIV_CON_SHIFT          = 0,
+	CLK_EMMC_DIV_CON_MASK           = 0xff << CLK_EMMC_DIV_CON_SHIFT,
+
+	/* CLKSEL_CON34 */
+	CLK_I2C_PLL_SEL_CPLL		= 0,
+	CLK_I2C_PLL_SEL_GPLL,
+	CLK_I2C_DIV_CON_MASK		= 0x7f,
+	CLK_I2C_PLL_SEL_MASK		= 1,
+	CLK_I2C1_PLL_SEL_SHIFT		= 15,
+	CLK_I2C1_DIV_CON_SHIFT		= 8,
+	CLK_I2C0_PLL_SEL_SHIFT		= 7,
+	CLK_I2C0_DIV_CON_SHIFT		= 0,
+
+	/* CLKSEL_CON35 */
+	CLK_I2C3_PLL_SEL_SHIFT		= 15,
+	CLK_I2C3_DIV_CON_SHIFT		= 8,
+	CLK_I2C2_PLL_SEL_SHIFT		= 7,
+	CLK_I2C2_DIV_CON_SHIFT		= 0,
+};
+
+#define VCO_MAX_KHZ	(3200 * (MHz / KHz))
+#define VCO_MIN_KHZ	(800 * (MHz / KHz))
+#define OUTPUT_MAX_KHZ	(3200 * (MHz / KHz))
+#define OUTPUT_MIN_KHZ	(16 * (MHz / KHz))
+
+/*
+ *  the div restructions of pll in integer mode, these are defined in
+ *  * CRU_*PLL_CON0 or PMUCRU_*PLL_CON0
+ */
+#define PLL_DIV_MIN	16
+#define PLL_DIV_MAX	3200
+
+/*
+ * How to calculate the PLL(from TRM V0.3 Part 1 Page 63):
+ * Formulas also embedded within the Fractional PLL Verilog model:
+ * If DSMPD = 1 (DSM is disabled, "integer mode")
+ * FOUTVCO = FREF / REFDIV * FBDIV
+ * FOUTPOSTDIV = FOUTVCO / POSTDIV1 / POSTDIV2
+ * Where:
+ * FOUTVCO = Fractional PLL non-divided output frequency
+ * FOUTPOSTDIV = Fractional PLL divided output frequency
+ *               (output of second post divider)
+ * FREF = Fractional PLL input reference frequency, (the OSC_HZ 24MHz input)
+ * REFDIV = Fractional PLL input reference clock divider
+ * FBDIV = Integer value programmed into feedback divide
+ *
+ */
+static void rkclk_set_pll(struct rk3328_cru *cru, enum rk_clk_id clk_id,
+			const struct pll_div *div)
+{
+	u32 *pll_con;
+	u32 mode_shift, mode_mask;
+
+	pll_con = NULL;
+	mode_shift = 0;
+	switch (clk_id) {
+	case CLK_ARM:
+		pll_con = cru->apll_con;
+		mode_shift = APLL_MODE_SHIFT;
+		break;
+	case CLK_DDR:
+		pll_con = cru->dpll_con;
+		mode_shift = DPLL_MODE_SHIFT;
+		break;
+	case CLK_CODEC:
+		pll_con = cru->cpll_con;
+		mode_shift = CPLL_MODE_SHIFT;
+		break;
+	case CLK_GENERAL:
+		pll_con = cru->gpll_con;
+		mode_shift = GPLL_MODE_SHIFT;
+		break;
+	case CLK_NEW:
+		pll_con = cru->npll_con;
+		mode_shift = NPLL_MODE_SHIFT;
+		break;
+	default:
+		break;
+	}
+	mode_mask = 1 << mode_shift;
+
+	/* All 8 PLLs have same VCO and output frequency range restrictions. */
+	u32 vco_khz = OSC_HZ / 1000 * div->fbdiv / div->refdiv;
+	u32 output_khz = vco_khz / div->postdiv1 / div->postdiv2;
+
+	debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, \
+	      postdiv2=%d, vco=%u khz, output=%u khz\n",
+	      pll_con, div->fbdiv, div->refdiv, div->postdiv1,
+	      div->postdiv2, vco_khz, output_khz);
+	assert(vco_khz >= VCO_MIN_KHZ && vco_khz <= VCO_MAX_KHZ &&
+	       output_khz >= OUTPUT_MIN_KHZ && output_khz <= OUTPUT_MAX_KHZ &&
+	       div->fbdiv >= PLL_DIV_MIN && div->fbdiv <= PLL_DIV_MAX);
+
+	/*
+	 * When power on or changing PLL setting,
+	 * we must force PLL into slow mode to ensure output stable clock.
+	 */
+	rk_clrsetreg(&cru->mode_con, mode_mask, PLL_MODE_SLOW << mode_shift);
+
+	/* use integer mode */
+	rk_clrsetreg(&pll_con[1], PLL_DSMPD_MASK,
+		     PLL_INTEGER_MODE << PLL_DSMPD_SHIFT);
+
+	rk_clrsetreg(&pll_con[0],
+		     PLL_FBDIV_MASK | PLL_POSTDIV1_MASK,
+		     (div->fbdiv << PLL_FBDIV_SHIFT) |
+		     (div->postdiv1 << PLL_POSTDIV1_SHIFT));
+	rk_clrsetreg(&pll_con[1],
+		     PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
+		     (div->postdiv2 << PLL_POSTDIV2_SHIFT) |
+		     (div->refdiv << PLL_REFDIV_SHIFT));
+
+	/* waiting for pll lock */
+	while (!(readl(&pll_con[1]) & (1 << PLL_LOCK_STATUS_SHIFT)))
+		udelay(1);
+
+	/* pll enter normal mode */
+	rk_clrsetreg(&cru->mode_con, mode_mask, PLL_MODE_NORM << mode_shift);
+}
+
+static void rkclk_init(struct rk3328_cru *cru)
+{
+	u32 aclk_div;
+	u32 hclk_div;
+	u32 pclk_div;
+
+	/* configure gpll cpll */
+	rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
+	rkclk_set_pll(cru, CLK_CODEC, &cpll_init_cfg);
+
+	/* configure perihp aclk, hclk, pclk */
+	aclk_div = GPLL_HZ / PERIHP_ACLK_HZ - 1;
+	hclk_div = PERIHP_ACLK_HZ / PERIHP_HCLK_HZ - 1;
+	pclk_div = PERIHP_ACLK_HZ / PERIHP_PCLK_HZ - 1;
+
+	rk_clrsetreg(&cru->clksel_con[28],
+		     ACLK_PERIHP_PLL_SEL_MASK | ACLK_PERIHP_DIV_CON_MASK,
+		     ACLK_PERIHP_PLL_SEL_GPLL << ACLK_PERIHP_PLL_SEL_SHIFT |
+		     aclk_div << ACLK_PERIHP_DIV_CON_SHIFT);
+	rk_clrsetreg(&cru->clksel_con[29],
+		     PCLK_PERIHP_DIV_CON_MASK | HCLK_PERIHP_DIV_CON_MASK,
+		     pclk_div << PCLK_PERIHP_DIV_CON_SHIFT |
+		     hclk_div << HCLK_PERIHP_DIV_CON_SHIFT);
+}
+
+void rk3328_configure_cpu(struct rk3328_cru *cru,
+			  enum apll_frequencies apll_freq)
+{
+	u32 clk_core_div;
+	u32 aclkm_div;
+	u32 pclk_dbg_div;
+
+	rkclk_set_pll(cru, CLK_ARM, apll_cfgs[apll_freq]);
+
+	clk_core_div = APLL_HZ / CLK_CORE_HZ - 1;
+	aclkm_div = APLL_HZ / ACLKM_CORE_HZ / (clk_core_div + 1) - 1;
+	pclk_dbg_div = APLL_HZ / PCLK_DBG_HZ / (clk_core_div + 1) - 1;
+
+	rk_clrsetreg(&cru->clksel_con[0],
+		     CLK_CORE_PLL_SEL_MASK | CLK_CORE_DIV_MASK,
+		     CLK_CORE_PLL_SEL_APLL << CLK_CORE_PLL_SEL_SHIFT |
+		     clk_core_div << CLK_CORE_DIV_SHIFT);
+
+	rk_clrsetreg(&cru->clksel_con[1],
+		     PCLK_DBG_DIV_MASK | ACLKM_CORE_DIV_MASK,
+		     pclk_dbg_div << PCLK_DBG_DIV_SHIFT |
+		     aclkm_div << ACLKM_CORE_DIV_SHIFT);
+}
+
+
+static ulong rk3328_i2c_get_clk(struct rk3328_cru *cru, ulong clk_id)
+{
+	u32 div, con;
+
+	switch (clk_id) {
+	case SCLK_I2C0:
+		con = readl(&cru->clksel_con[34]);
+		div = con >> CLK_I2C0_DIV_CON_SHIFT & CLK_I2C_DIV_CON_MASK;
+		break;
+	case SCLK_I2C1:
+		con = readl(&cru->clksel_con[34]);
+		div = con >> CLK_I2C1_DIV_CON_SHIFT & CLK_I2C_DIV_CON_MASK;
+		break;
+	case SCLK_I2C2:
+		con = readl(&cru->clksel_con[35]);
+		div = con >> CLK_I2C2_DIV_CON_SHIFT & CLK_I2C_DIV_CON_MASK;
+		break;
+	case SCLK_I2C3:
+		con = readl(&cru->clksel_con[35]);
+		div = con >> CLK_I2C3_DIV_CON_SHIFT & CLK_I2C_DIV_CON_MASK;
+		break;
+	default:
+		printf("do not support this i2c bus\n");
+		return -EINVAL;
+	}
+
+	return DIV_TO_RATE(GPLL_HZ, div);
+}
+
+static ulong rk3328_i2c_set_clk(struct rk3328_cru *cru, ulong clk_id, uint hz)
+{
+	int src_clk_div;
+
+	src_clk_div = GPLL_HZ / hz;
+	assert(src_clk_div - 1 < 127);
+
+	switch (clk_id) {
+	case SCLK_I2C0:
+		rk_clrsetreg(&cru->clksel_con[34],
+			     CLK_I2C_DIV_CON_MASK << CLK_I2C0_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_MASK << CLK_I2C0_PLL_SEL_SHIFT,
+			     (src_clk_div - 1) << CLK_I2C0_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_GPLL << CLK_I2C0_PLL_SEL_SHIFT);
+		break;
+	case SCLK_I2C1:
+		rk_clrsetreg(&cru->clksel_con[34],
+			     CLK_I2C_DIV_CON_MASK << CLK_I2C1_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_MASK << CLK_I2C1_PLL_SEL_SHIFT,
+			     (src_clk_div - 1) << CLK_I2C1_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_GPLL << CLK_I2C1_PLL_SEL_SHIFT);
+		break;
+	case SCLK_I2C2:
+		rk_clrsetreg(&cru->clksel_con[35],
+			     CLK_I2C_DIV_CON_MASK << CLK_I2C2_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_MASK << CLK_I2C2_PLL_SEL_SHIFT,
+			     (src_clk_div - 1) << CLK_I2C2_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_GPLL << CLK_I2C2_PLL_SEL_SHIFT);
+		break;
+	case SCLK_I2C3:
+		rk_clrsetreg(&cru->clksel_con[35],
+			     CLK_I2C_DIV_CON_MASK << CLK_I2C3_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_MASK << CLK_I2C3_PLL_SEL_SHIFT,
+			     (src_clk_div - 1) << CLK_I2C3_DIV_CON_SHIFT |
+			     CLK_I2C_PLL_SEL_GPLL << CLK_I2C3_PLL_SEL_SHIFT);
+		break;
+	default:
+		printf("do not support this i2c bus\n");
+		return -EINVAL;
+	}
+
+	return DIV_TO_RATE(GPLL_HZ, src_clk_div);
+}
+
+static ulong rk3328_mmc_get_clk(struct rk3328_cru *cru, uint clk_id)
+{
+	u32 div, con, con_id;
+
+	switch (clk_id) {
+	case HCLK_SDMMC:
+		con_id = 30;
+		break;
+	case HCLK_EMMC:
+		con_id = 32;
+		break;
+	default:
+		return -EINVAL;
+	}
+	con = readl(&cru->clksel_con[con_id]);
+	div = (con & CLK_EMMC_DIV_CON_MASK) >> CLK_EMMC_DIV_CON_SHIFT;
+
+	if ((con & CLK_EMMC_PLL_MASK) >> CLK_EMMC_PLL_SHIFT
+	    == CLK_EMMC_PLL_SEL_24M)
+		return DIV_TO_RATE(OSC_HZ, div);
+	else
+		return DIV_TO_RATE(GPLL_HZ, div);
+}
+
+static ulong rk3328_mmc_set_clk(struct rk3328_cru *cru,
+				ulong clk_id, ulong set_rate)
+{
+	int src_clk_div;
+	u32 con_id;
+
+	switch (clk_id) {
+	case HCLK_SDMMC:
+		con_id = 30;
+		break;
+	case HCLK_EMMC:
+		con_id = 32;
+		break;
+	default:
+		return -EINVAL;
+	}
+	/* Select clk_sdmmc/emmc source from GPLL by default */
+	src_clk_div = GPLL_HZ / set_rate;
+
+	if (src_clk_div > 127) {
+		/* use 24MHz source for 400KHz clock */
+		src_clk_div = OSC_HZ / set_rate;
+		rk_clrsetreg(&cru->clksel_con[con_id],
+			     CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK,
+			     CLK_EMMC_PLL_SEL_24M << CLK_EMMC_PLL_SHIFT |
+			     (src_clk_div - 1) << CLK_EMMC_DIV_CON_SHIFT);
+	} else {
+		rk_clrsetreg(&cru->clksel_con[con_id],
+			     CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK,
+			     CLK_EMMC_PLL_SEL_GPLL << CLK_EMMC_PLL_SHIFT |
+			     (src_clk_div - 1) << CLK_EMMC_DIV_CON_SHIFT);
+	}
+
+	return rk3328_mmc_get_clk(cru, clk_id);
+}
+
+static ulong rk3328_pwm_get_clk(struct rk3328_cru *cru)
+{
+	u32 div, con;
+
+	con = readl(&cru->clksel_con[24]);
+	div = (con & CLK_PWM_DIV_CON_MASK) >> CLK_PWM_DIV_CON_SHIFT;
+
+	return DIV_TO_RATE(GPLL_HZ, div);
+}
+
+static ulong rk3328_pwm_set_clk(struct rk3328_cru *cru, uint hz)
+{
+	u32 div = GPLL_HZ / hz;
+
+	rk_clrsetreg(&cru->clksel_con[24],
+		     CLK_PWM_PLL_SEL_MASK | CLK_PWM_DIV_CON_MASK,
+		     CLK_PWM_PLL_SEL_GPLL << CLK_PWM_PLL_SEL_SHIFT |
+		     (div - 1) << CLK_PWM_DIV_CON_SHIFT);
+
+	return DIV_TO_RATE(GPLL_HZ, div);
+}
+
+static ulong rk3328_clk_get_rate(struct clk *clk)
+{
+	struct rk3328_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong rate = 0;
+
+	switch (clk->id) {
+	case 0 ... 29:
+		return 0;
+	case HCLK_SDMMC:
+	case HCLK_EMMC:
+		rate = rk3328_mmc_get_clk(priv->cru, clk->id);
+		break;
+	case SCLK_I2C0:
+	case SCLK_I2C1:
+	case SCLK_I2C2:
+	case SCLK_I2C3:
+		rate = rk3328_i2c_get_clk(priv->cru, clk->id);
+		break;
+	case SCLK_PWM:
+		rate = rk3328_pwm_get_clk(priv->cru);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return rate;
+}
+
+static ulong rk3328_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct rk3328_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong ret = 0;
+
+	switch (clk->id) {
+	case 0 ... 29:
+		return 0;
+	case HCLK_SDMMC:
+	case HCLK_EMMC:
+		ret = rk3328_mmc_set_clk(priv->cru, clk->id, rate);
+		break;
+	case SCLK_I2C0:
+	case SCLK_I2C1:
+	case SCLK_I2C2:
+	case SCLK_I2C3:
+		ret = rk3328_i2c_set_clk(priv->cru, clk->id, rate);
+		break;
+	case SCLK_PWM:
+		ret = rk3328_pwm_set_clk(priv->cru, rate);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return ret;
+}
+
+static struct clk_ops rk3328_clk_ops = {
+	.get_rate = rk3328_clk_get_rate,
+	.set_rate = rk3328_clk_set_rate,
+};
+
+static int rk3328_clk_probe(struct udevice *dev)
+{
+	struct rk3328_clk_priv *priv = dev_get_priv(dev);
+
+	rkclk_init(priv->cru);
+
+	return 0;
+}
+
+static int rk3328_clk_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk3328_clk_priv *priv = dev_get_priv(dev);
+
+	priv->cru = (struct rk3328_cru *)dev_get_addr(dev);
+
+	return 0;
+}
+
+static int rk3328_clk_bind(struct udevice *dev)
+{
+	int ret;
+
+	/* The reset driver does not have a device node, so bind it here */
+	ret = device_bind_driver(gd->dm_root, "rk3328_sysreset", "reset", &dev);
+	if (ret)
+		printf("Warning: No RK3328 reset driver: ret=%d\n", ret);
+
+	return ret;
+}
+
+static const struct udevice_id rk3328_clk_ids[] = {
+	{ .compatible = "rockchip,rk3328-cru" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_rk3328_cru) = {
+	.name		= "rockchip_rk3328_cru",
+	.id		= UCLASS_CLK,
+	.of_match	= rk3328_clk_ids,
+	.priv_auto_alloc_size = sizeof(struct rk3328_clk_priv),
+	.ofdata_to_platdata = rk3328_clk_ofdata_to_platdata,
+	.ops		= &rk3328_clk_ops,
+	.bind		= rk3328_clk_bind,
+	.probe		= rk3328_clk_probe,
+};