rockchip: rk3066: add clock driver for rk3066 soc

Add the clock driver for the rk3066 platform.

Derived from the rk3288 and rk3188 driver it
supports only a bare minimum to bring up the system
to reduce the TPL size for:
  SDRAM clock configuration.
  The boot devices NAND, EMMC, SDMMC, SPI.
  A UART for the debug messages (fixed) at 115200n8.
  A SARADC for the recovery button.
  A TIMER for the delays (fixed).

There's support for two possible frequencies,
the safe 600MHz which will work with default pmic settings and
will be set to get away from the 24MHz default and
the maximum of 1.416Ghz, which boards can set if they
were able to get pmic support for it.

After the clock tree is set during the TPL probe
there's no parent update support.

In OF_REAL mode the drivers ns16550.c and dw-apb-timer.c
obtain the (fixed) clk_get_rate from the clock driver
instead of platdata.

The rk3066 cru node has a number of assigned-clocks properties
that call the .set_rate() function. Add them to the list so that
they return a 0 instead of -ENOENT.

Signed-off-by: Paweł Jarosz <paweljarosz3691@gmail.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

2 files changed, 718 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
index 913f611a0f..a72d8fe58a 100644
--- a/drivers/clk/rockchip/Makefile
+++ b/drivers/clk/rockchip/Makefile
@@ -6,6 +6,7 @@
 obj-y += clk_pll.o
 obj-$(CONFIG_ROCKCHIP_PX30) += clk_px30.o
 obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
+obj-$(CONFIG_ROCKCHIP_RK3066) += clk_rk3066.o
 obj-$(CONFIG_ROCKCHIP_RK3128) += clk_rk3128.o
 obj-$(CONFIG_ROCKCHIP_RK3188) += clk_rk3188.o
 obj-$(CONFIG_ROCKCHIP_RK322X) += clk_rk322x.o
diff --git a/drivers/clk/rockchip/clk_rk3066.c b/drivers/clk/rockchip/clk_rk3066.c
new file mode 100644
index 0000000000..2c12f6e044
--- /dev/null
+++ b/drivers/clk/rockchip/clk_rk3066.c
@@ -0,0 +1,717 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2015 Google, Inc
+ * (C) Copyright 2016 Heiko Stuebner <heiko@sntech.de>
+ */
+
+#include <bitfield.h>
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <errno.h>
+#include <log.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/cru_rk3066.h>
+#include <asm/arch-rockchip/grf_rk3066.h>
+#include <asm/arch-rockchip/hardware.h>
+#include <dt-bindings/clock/rk3066a-cru.h>
+#include <dm/device_compat.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/uclass-internal.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/log2.h>
+#include <linux/stringify.h>
+
+struct rk3066_clk_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_rockchip_rk3066a_cru dtd;
+#endif
+};
+
+struct pll_div {
+	u32 nr;
+	u32 nf;
+	u32 no;
+};
+
+enum {
+	VCO_MAX_HZ	= 1416U * 1000000,
+	VCO_MIN_HZ	= 300 * 1000000,
+	OUTPUT_MAX_HZ	= 1416U * 1000000,
+	OUTPUT_MIN_HZ	= 30 * 1000000,
+	FREF_MAX_HZ	= 1416U * 1000000,
+	FREF_MIN_HZ	= 30 * 1000,
+};
+
+enum {
+	/* PLL CON0 */
+	PLL_OD_MASK		= GENMASK(3, 0),
+
+	/* PLL CON1 */
+	PLL_NF_MASK		= GENMASK(12, 0),
+
+	/* PLL CON2 */
+	PLL_BWADJ_MASK		= GENMASK(11, 0),
+
+	/* PLL CON3 */
+	PLL_RESET_SHIFT		= 5,
+
+	/* GRF_SOC_STATUS0 */
+	SOCSTS_DPLL_LOCK	= BIT(4),
+	SOCSTS_APLL_LOCK	= BIT(5),
+	SOCSTS_CPLL_LOCK	= BIT(6),
+	SOCSTS_GPLL_LOCK	= BIT(7),
+};
+
+#define DIV_TO_RATE(input_rate, div)	((input_rate) / ((div) + 1))
+
+#define PLL_DIVISORS(hz, _nr, _no) {\
+	.nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no};\
+	_Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
+		       (_nr * _no) == hz, #hz "Hz cannot be hit with PLL "\
+		       "divisors on line " __stringify(__LINE__))
+
+/* Keep divisors as low as possible to reduce jitter and power usage. */
+static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2);
+static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 2);
+
+static int rk3066_clk_set_pll(struct rk3066_cru *cru, enum rk_clk_id clk_id,
+			      const struct pll_div *div)
+{
+	int pll_id = rk_pll_id(clk_id);
+	struct rk3066_pll *pll = &cru->pll[pll_id];
+	/* All PLLs have the same VCO and output frequency range restrictions. */
+	uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
+	uint output_hz = vco_hz / div->no;
+
+	debug("%s: PLL at %x: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n", __func__,
+	      (uint)pll, div->nf, div->nr, div->no, vco_hz, output_hz);
+	assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
+	       output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ &&
+	       (div->no == 1 || !(div->no % 2)));
+
+	/* Enter reset. */
+	rk_setreg(&pll->con3, BIT(PLL_RESET_SHIFT));
+
+	rk_clrsetreg(&pll->con0,
+		     CLKR_MASK | PLL_OD_MASK,
+		     ((div->nr - 1) << CLKR_SHIFT) | (div->no - 1));
+	rk_clrsetreg(&pll->con1, CLKF_MASK, div->nf - 1);
+
+	rk_clrsetreg(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);
+
+	/* Exit reset. */
+	rk_clrreg(&pll->con3, BIT(PLL_RESET_SHIFT));
+
+	return 0;
+}
+
+static int rk3066_clk_configure_ddr(struct rk3066_cru *cru, struct rk3066_grf *grf,
+				    unsigned int hz)
+{
+	static const struct pll_div dpll_cfg[] = {
+		{.nf = 25, .nr = 2, .no = 1},
+		{.nf = 400, .nr = 9, .no = 2},
+		{.nf = 500, .nr = 9, .no = 2},
+		{.nf = 100, .nr = 3, .no = 1},
+	};
+	int cfg;
+
+	switch (hz) {
+	case 300000000:
+		cfg = 0;
+		break;
+	case 533000000:	/* actually 533.3P MHz */
+		cfg = 1;
+		break;
+	case 666000000:	/* actually 666.6P MHz */
+		cfg = 2;
+		break;
+	case 800000000:
+		cfg = 3;
+		break;
+	default:
+		debug("%s: unsupported SDRAM frequency", __func__);
+		return -EINVAL;
+	}
+
+	/* Enter PLL slow mode. */
+	rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
+		     PLL_MODE_SLOW << DPLL_MODE_SHIFT);
+
+	rk3066_clk_set_pll(cru, CLK_DDR, &dpll_cfg[cfg]);
+
+	/* Wait for PLL lock. */
+	while (!(readl(&grf->soc_status0) & SOCSTS_DPLL_LOCK))
+		udelay(1);
+
+	/* Enter PLL normal mode. */
+	rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
+		     PLL_MODE_NORMAL << DPLL_MODE_SHIFT);
+
+	return 0;
+}
+
+static int rk3066_clk_configure_cpu(struct rk3066_cru *cru, struct rk3066_grf *grf,
+				    unsigned int hz)
+{
+	static const struct pll_div apll_cfg[] = {
+		{.nf = 50, .nr = 1, .no = 2},
+		{.nf = 59, .nr = 1, .no = 1},
+	};
+	int div_core_peri, div_cpu_aclk, cfg;
+
+	/*
+	 * We support two possible frequencies, the safe 600MHz
+	 * which will work with default pmic settings and will
+	 * be set to get away from the 24MHz default and
+	 * the maximum of 1.416Ghz, which boards can set if they
+	 * were able to get pmic support for it.
+	 */
+	switch (hz) {
+	case APLL_SAFE_HZ:
+		cfg = 0;
+		div_core_peri = 1;
+		div_cpu_aclk = 3;
+		break;
+	case APLL_HZ:
+		cfg = 1;
+		div_core_peri = 2;
+		div_cpu_aclk = 3;
+		break;
+	default:
+		debug("unsupported ARMCLK frequency");
+		return -EINVAL;
+	}
+
+	/* Enter PLL slow mode. */
+	rk_clrsetreg(&cru->cru_mode_con, APLL_MODE_MASK,
+		     PLL_MODE_SLOW << APLL_MODE_SHIFT);
+
+	rk3066_clk_set_pll(cru, CLK_ARM, &apll_cfg[cfg]);
+
+	/* Wait for PLL lock. */
+	while (!(readl(&grf->soc_status0) & SOCSTS_APLL_LOCK))
+		udelay(1);
+
+	/* Set divider for peripherals attached to the CPU core. */
+	rk_clrsetreg(&cru->cru_clksel_con[0],
+		     CORE_PERI_DIV_MASK,
+		     div_core_peri << CORE_PERI_DIV_SHIFT);
+
+	/* Set up dependent divisor for cpu_aclk. */
+	rk_clrsetreg(&cru->cru_clksel_con[1],
+		     CPU_ACLK_DIV_MASK,
+		     div_cpu_aclk << CPU_ACLK_DIV_SHIFT);
+
+	/* Enter PLL normal mode. */
+	rk_clrsetreg(&cru->cru_mode_con, APLL_MODE_MASK,
+		     PLL_MODE_NORMAL << APLL_MODE_SHIFT);
+
+	return hz;
+}
+
+static uint32_t rk3066_clk_pll_get_rate(struct rk3066_cru *cru,
+					enum rk_clk_id clk_id)
+{
+	u32 nr, no, nf;
+	u32 con;
+	int pll_id = rk_pll_id(clk_id);
+	struct rk3066_pll *pll = &cru->pll[pll_id];
+	static u8 clk_shift[CLK_COUNT] = {
+		0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, CPLL_MODE_SHIFT,
+		GPLL_MODE_SHIFT
+	};
+	uint shift;
+
+	con = readl(&cru->cru_mode_con);
+	shift = clk_shift[clk_id];
+	switch (FIELD_GET(APLL_MODE_MASK, con >> shift)) {
+	case PLL_MODE_SLOW:
+		return OSC_HZ;
+	case PLL_MODE_NORMAL:
+		/* normal mode */
+		con = readl(&pll->con0);
+		no = bitfield_extract_by_mask(con, CLKOD_MASK) + 1;
+		nr = bitfield_extract_by_mask(con, CLKR_MASK) + 1;
+		con = readl(&pll->con1);
+		nf = bitfield_extract_by_mask(con, CLKF_MASK) + 1;
+
+		return (OSC_HZ * nf) / (nr * no);
+	case PLL_MODE_DEEP:
+	default:
+		return 32768;
+	}
+}
+
+static ulong rk3066_clk_mmc_get_clk(struct rk3066_cru *cru, uint gclk_rate,
+				    int periph)
+{
+	uint div;
+	u32 con;
+
+	switch (periph) {
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+		con = readl(&cru->cru_clksel_con[12]);
+		div = bitfield_extract_by_mask(con, EMMC_DIV_MASK);
+		break;
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		con = readl(&cru->cru_clksel_con[11]);
+		div = bitfield_extract_by_mask(con, MMC0_DIV_MASK);
+		break;
+	case HCLK_SDIO:
+	case SCLK_SDIO:
+		con = readl(&cru->cru_clksel_con[12]);
+		div = bitfield_extract_by_mask(con, SDIO_DIV_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return DIV_TO_RATE(gclk_rate, div) / 2;
+}
+
+static ulong rk3066_clk_mmc_set_clk(struct rk3066_cru *cru, uint gclk_rate,
+				    int  periph, uint freq)
+{
+	int src_clk_div;
+
+	debug("%s: gclk_rate=%u\n", __func__, gclk_rate);
+	/* MMC clock by default divides by 2 internally, so need to provide double in CRU. */
+	src_clk_div = DIV_ROUND_UP(gclk_rate / 2, freq) - 1;
+	assert(src_clk_div <= 0x3f);
+
+	switch (periph) {
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+		rk_clrsetreg(&cru->cru_clksel_con[12],
+			     EMMC_DIV_MASK,
+			     src_clk_div << EMMC_DIV_SHIFT);
+		break;
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		rk_clrsetreg(&cru->cru_clksel_con[11],
+			     MMC0_DIV_MASK,
+			     src_clk_div << MMC0_DIV_SHIFT);
+		break;
+	case HCLK_SDIO:
+	case SCLK_SDIO:
+		rk_clrsetreg(&cru->cru_clksel_con[12],
+			     SDIO_DIV_MASK,
+			     src_clk_div << SDIO_DIV_SHIFT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return rk3066_clk_mmc_get_clk(cru, gclk_rate, periph);
+}
+
+static ulong rk3066_clk_spi_get_clk(struct rk3066_cru *cru, uint gclk_rate,
+				    int periph)
+{
+	uint div;
+	u32 con;
+
+	switch (periph) {
+	case SCLK_SPI0:
+		con = readl(&cru->cru_clksel_con[25]);
+		div = bitfield_extract_by_mask(con, SPI0_DIV_MASK);
+		break;
+	case SCLK_SPI1:
+		con = readl(&cru->cru_clksel_con[25]);
+		div = bitfield_extract_by_mask(con, SPI1_DIV_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return DIV_TO_RATE(gclk_rate, div);
+}
+
+static ulong rk3066_clk_spi_set_clk(struct rk3066_cru *cru, uint gclk_rate,
+				    int periph, uint freq)
+{
+	int src_clk_div = DIV_ROUND_UP(gclk_rate, freq) - 1;
+
+	assert(src_clk_div < 128);
+	switch (periph) {
+	case SCLK_SPI0:
+		assert(src_clk_div <= SPI0_DIV_MASK >> SPI0_DIV_SHIFT);
+		rk_clrsetreg(&cru->cru_clksel_con[25],
+			     SPI0_DIV_MASK,
+			     src_clk_div << SPI0_DIV_SHIFT);
+		break;
+	case SCLK_SPI1:
+		assert(src_clk_div <= SPI1_DIV_MASK >> SPI1_DIV_SHIFT);
+		rk_clrsetreg(&cru->cru_clksel_con[25],
+			     SPI1_DIV_MASK,
+			     src_clk_div << SPI1_DIV_SHIFT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return rk3066_clk_spi_get_clk(cru, gclk_rate, periph);
+}
+
+static ulong rk3066_clk_saradc_get_clk(struct rk3066_cru *cru, int periph)
+{
+	u32 div, con;
+
+	switch (periph) {
+	case SCLK_SARADC:
+		con = readl(&cru->cru_clksel_con[24]);
+		div = bitfield_extract_by_mask(con, SARADC_DIV_MASK);
+		break;
+	case SCLK_TSADC:
+		con = readl(&cru->cru_clksel_con[34]);
+		div = bitfield_extract_by_mask(con, TSADC_DIV_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return DIV_TO_RATE(PERI_PCLK_HZ, div);
+}
+
+static ulong rk3066_clk_saradc_set_clk(struct rk3066_cru *cru, uint hz,
+				       int periph)
+{
+	int src_clk_div;
+
+	src_clk_div = DIV_ROUND_UP(PERI_PCLK_HZ, hz) - 1;
+	assert(src_clk_div < 128);
+
+	switch (periph) {
+	case SCLK_SARADC:
+		rk_clrsetreg(&cru->cru_clksel_con[24],
+			     SARADC_DIV_MASK,
+			     src_clk_div << SARADC_DIV_SHIFT);
+		break;
+	case SCLK_TSADC:
+		rk_clrsetreg(&cru->cru_clksel_con[34],
+			     SARADC_DIV_MASK,
+			     src_clk_div << SARADC_DIV_SHIFT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return rk3066_clk_saradc_get_clk(cru, periph);
+}
+
+static void rk3066_clk_init(struct rk3066_cru *cru, struct rk3066_grf *grf)
+{
+	u32 aclk_div, hclk_div, pclk_div, h2p_div;
+
+	/* Enter PLL slow mode. */
+	rk_clrsetreg(&cru->cru_mode_con,
+		     GPLL_MODE_MASK |
+		     CPLL_MODE_MASK,
+		     PLL_MODE_SLOW << GPLL_MODE_SHIFT |
+		     PLL_MODE_SLOW << CPLL_MODE_SHIFT);
+
+	/* Init PLL. */
+	rk3066_clk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
+	rk3066_clk_set_pll(cru, CLK_CODEC, &cpll_init_cfg);
+
+	/* Wait for PLL lock. */
+	while ((readl(&grf->soc_status0) &
+		(SOCSTS_CPLL_LOCK | SOCSTS_GPLL_LOCK)) !=
+	       (SOCSTS_CPLL_LOCK | SOCSTS_GPLL_LOCK))
+		udelay(1);
+
+	/*
+	 * Select CPU clock PLL source and
+	 * reparent aclk_cpu_pre from APPL to GPLL.
+	 * Set up dependent divisors for PCLK/HCLK and ACLK clocks.
+	 */
+	aclk_div = DIV_ROUND_UP(GPLL_HZ, CPU_ACLK_HZ) - 1;
+	assert((aclk_div + 1) * CPU_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
+
+	rk_clrsetreg(&cru->cru_clksel_con[0],
+		     CPU_ACLK_PLL_MASK |
+		     A9_CORE_DIV_MASK,
+		     CPU_ACLK_PLL_SELECT_GPLL << CPU_ACLK_PLL_SHIFT |
+		     aclk_div << A9_CORE_DIV_SHIFT);
+
+	hclk_div = ilog2(CPU_ACLK_HZ / CPU_HCLK_HZ);
+	assert((1 << hclk_div) * CPU_HCLK_HZ == CPU_ACLK_HZ && hclk_div < 0x3);
+	pclk_div = ilog2(CPU_ACLK_HZ / CPU_PCLK_HZ);
+	assert((1 << pclk_div) * CPU_PCLK_HZ == CPU_ACLK_HZ && pclk_div < 0x4);
+	h2p_div = ilog2(CPU_HCLK_HZ / CPU_H2P_HZ);
+	assert((1 << h2p_div) * CPU_H2P_HZ == CPU_HCLK_HZ && pclk_div < 0x3);
+
+	rk_clrsetreg(&cru->cru_clksel_con[1],
+		     AHB2APB_DIV_MASK |
+		     CPU_PCLK_DIV_MASK |
+		     CPU_HCLK_DIV_MASK,
+		     h2p_div << AHB2APB_DIV_SHIFT |
+		     pclk_div << CPU_PCLK_DIV_SHIFT |
+		     hclk_div << CPU_HCLK_DIV_SHIFT);
+
+	/*
+	 * Select PERI clock PLL source and
+	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+	 */
+	aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
+	assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
+
+	hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
+	assert((1 << hclk_div) * PERI_HCLK_HZ ==
+	       PERI_ACLK_HZ && (hclk_div < 0x4));
+
+	pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
+	assert((1 << pclk_div) * PERI_PCLK_HZ ==
+	       PERI_ACLK_HZ && (pclk_div < 0x4));
+
+	rk_clrsetreg(&cru->cru_clksel_con[10],
+		     PERI_PCLK_DIV_MASK |
+		     PERI_HCLK_DIV_MASK |
+		     PERI_ACLK_DIV_MASK,
+		     PERI_SEL_GPLL << PERI_SEL_PLL_SHIFT |
+		     pclk_div << PERI_PCLK_DIV_SHIFT |
+		     hclk_div << PERI_HCLK_DIV_SHIFT |
+		     aclk_div << PERI_ACLK_DIV_SHIFT);
+
+	/* Enter PLL normal mode. */
+	rk_clrsetreg(&cru->cru_mode_con,
+		     GPLL_MODE_MASK |
+		     CPLL_MODE_MASK,
+		     PLL_MODE_NORMAL << GPLL_MODE_SHIFT |
+		     PLL_MODE_NORMAL << CPLL_MODE_SHIFT);
+
+	rk3066_clk_mmc_set_clk(cru, PERI_HCLK_HZ, HCLK_SDMMC, 16000000);
+}
+
+static ulong rk3066_clk_get_rate(struct clk *clk)
+{
+	struct rk3066_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong new_rate, gclk_rate;
+
+	gclk_rate = rk3066_clk_pll_get_rate(priv->cru, CLK_GENERAL);
+	switch (clk->id) {
+	case 1 ... 4:
+		new_rate = rk3066_clk_pll_get_rate(priv->cru, clk->id);
+		break;
+	case HCLK_EMMC:
+	case HCLK_SDMMC:
+	case HCLK_SDIO:
+	case SCLK_EMMC:
+	case SCLK_SDMMC:
+	case SCLK_SDIO:
+		new_rate = rk3066_clk_mmc_get_clk(priv->cru, PERI_HCLK_HZ,
+						  clk->id);
+		break;
+	case SCLK_SPI0:
+	case SCLK_SPI1:
+		new_rate = rk3066_clk_spi_get_clk(priv->cru, PERI_PCLK_HZ,
+						  clk->id);
+		break;
+	case PCLK_I2C0:
+	case PCLK_I2C1:
+	case PCLK_I2C2:
+	case PCLK_I2C3:
+	case PCLK_I2C4:
+		return gclk_rate;
+	case SCLK_SARADC:
+	case SCLK_TSADC:
+		new_rate = rk3066_clk_saradc_get_clk(priv->cru, clk->id);
+		break;
+	case SCLK_TIMER0:
+	case SCLK_TIMER1:
+	case SCLK_TIMER2:
+	case SCLK_UART0:
+	case SCLK_UART1:
+	case SCLK_UART2:
+	case SCLK_UART3:
+		return OSC_HZ;
+	default:
+		return -ENOENT;
+	}
+
+	return new_rate;
+}
+
+static ulong rk3066_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct rk3066_clk_priv *priv = dev_get_priv(clk->dev);
+	struct rk3066_cru *cru = priv->cru;
+	ulong new_rate;
+
+	switch (clk->id) {
+	case PLL_APLL:
+		new_rate = rk3066_clk_configure_cpu(priv->cru, priv->grf, rate);
+		break;
+	case CLK_DDR:
+		new_rate = rk3066_clk_configure_ddr(priv->cru, priv->grf, rate);
+		break;
+	case HCLK_EMMC:
+	case HCLK_SDMMC:
+	case HCLK_SDIO:
+	case SCLK_EMMC:
+	case SCLK_SDMMC:
+	case SCLK_SDIO:
+		new_rate = rk3066_clk_mmc_set_clk(cru, PERI_HCLK_HZ,
+						  clk->id, rate);
+		break;
+	case SCLK_SPI0:
+	case SCLK_SPI1:
+		new_rate = rk3066_clk_spi_set_clk(cru, PERI_PCLK_HZ,
+						  clk->id, rate);
+		break;
+	case SCLK_SARADC:
+	case SCLK_TSADC:
+		new_rate = rk3066_clk_saradc_set_clk(cru, rate, clk->id);
+		break;
+	case PLL_CPLL:
+	case PLL_GPLL:
+	case ACLK_CPU:
+	case HCLK_CPU:
+	case PCLK_CPU:
+	case ACLK_PERI:
+	case HCLK_PERI:
+	case PCLK_PERI:
+		return 0;
+	default:
+		return -ENOENT;
+	}
+
+	return new_rate;
+}
+
+static int rk3066_clk_enable(struct clk *clk)
+{
+	struct rk3066_clk_priv *priv = dev_get_priv(clk->dev);
+
+	switch (clk->id) {
+	case HCLK_NANDC0:
+		rk_clrreg(&priv->cru->cru_clkgate_con[5], BIT(9));
+		break;
+	case HCLK_SDMMC:
+		rk_clrreg(&priv->cru->cru_clkgate_con[5], BIT(10));
+		break;
+	case HCLK_SDIO:
+		rk_clrreg(&priv->cru->cru_clkgate_con[5], BIT(11));
+		break;
+	}
+
+	return 0;
+}
+
+static int rk3066_clk_disable(struct clk *clk)
+{
+	struct rk3066_clk_priv *priv = dev_get_priv(clk->dev);
+
+	switch (clk->id) {
+	case HCLK_NANDC0:
+		rk_setreg(&priv->cru->cru_clkgate_con[5], BIT(9));
+		break;
+	case HCLK_SDMMC:
+		rk_setreg(&priv->cru->cru_clkgate_con[5], BIT(10));
+		break;
+	case HCLK_SDIO:
+		rk_setreg(&priv->cru->cru_clkgate_con[5], BIT(11));
+		break;
+	}
+
+	return 0;
+}
+
+static struct clk_ops rk3066_clk_ops = {
+	.disable	= rk3066_clk_disable,
+	.enable	= rk3066_clk_enable,
+	.get_rate	= rk3066_clk_get_rate,
+	.set_rate	= rk3066_clk_set_rate,
+};
+
+static int rk3066_clk_of_to_plat(struct udevice *dev)
+{
+	if (CONFIG_IS_ENABLED(OF_REAL)) {
+		struct rk3066_clk_priv *priv = dev_get_priv(dev);
+
+		priv->cru = dev_read_addr_ptr(dev);
+	}
+
+	return 0;
+}
+
+static int rk3066_clk_probe(struct udevice *dev)
+{
+	struct rk3066_clk_priv *priv = dev_get_priv(dev);
+
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	if (IS_ERR(priv->grf))
+		return PTR_ERR(priv->grf);
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct rk3066_clk_plat *plat = dev_get_plat(dev);
+
+	priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
+#endif
+
+	if (IS_ENABLED(CONFIG_TPL_BUILD)) {
+		rk3066_clk_init(priv->cru, priv->grf);
+
+		/* Init CPU frequency. */
+		rk3066_clk_configure_cpu(priv->cru, priv->grf, APLL_SAFE_HZ);
+	}
+
+	return 0;
+}
+
+static int rk3066_clk_bind(struct udevice *dev)
+{
+	struct udevice *sys_child;
+	struct sysreset_reg *priv;
+	int reg_offset, ret;
+
+	/* The reset driver does not have a device node, so bind it here. */
+	ret = device_bind(dev, DM_DRIVER_GET(sysreset_rockchip), "sysreset",
+			  NULL, ofnode_null(), &sys_child);
+	if (ret) {
+		dev_dbg(dev, "Warning: No sysreset driver: ret=%d\n", ret);
+	} else {
+		priv = malloc(sizeof(struct sysreset_reg));
+		priv->glb_srst_fst_value = offsetof(struct rk3066_cru,
+						    cru_glb_srst_fst_value);
+		priv->glb_srst_snd_value = offsetof(struct rk3066_cru,
+						    cru_glb_srst_snd_value);
+		dev_set_priv(sys_child, priv);
+	}
+
+	if (CONFIG_IS_ENABLED(RESET_ROCKCHIP)) {
+		reg_offset = offsetof(struct rk3066_cru, cru_softrst_con[0]);
+		ret = rockchip_reset_bind(dev, reg_offset, 9);
+		if (ret)
+			dev_dbg(dev, "Warning: software reset driver bind failed\n");
+	}
+
+	return 0;
+}
+
+static const struct udevice_id rk3066_clk_ids[] = {
+	{ .compatible = "rockchip,rk3066a-cru" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_rk3066a_cru) = {
+	.name		= "rockchip_rk3066a_cru",
+	.id		= UCLASS_CLK,
+	.ops		= &rk3066_clk_ops,
+	.probe		= rk3066_clk_probe,
+	.bind		= rk3066_clk_bind,
+	.of_match	= rk3066_clk_ids,
+	.of_to_plat	= rk3066_clk_of_to_plat,
+	.priv_auto	= sizeof(struct rk3066_clk_priv),
+	.plat_auto	= sizeof(struct rk3066_clk_plat),
+};