rockchip: rk3036: Add clock driver
authorhuang lin <hl@rock-chips.com>
Tue, 17 Nov 2015 06:20:16 +0000 (14:20 +0800)
committerSimon Glass <sjg@chromium.org>
Tue, 1 Dec 2015 15:07:22 +0000 (08:07 -0700)
Add a driver for setting up and modifying the various PLLs, peripheral
clocks and mmc clocks on RK3036

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
arch/arm/include/asm/arch-rockchip/cru_rk3036.h [new file with mode: 0644]
drivers/clk/Makefile
drivers/clk/clk_rk3036.c [new file with mode: 0644]

diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3036.h b/arch/arm/include/asm/arch-rockchip/cru_rk3036.h
new file mode 100644 (file)
index 0000000..7ecc8ee
--- /dev/null
@@ -0,0 +1,168 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+#ifndef _ASM_ARCH_CRU_RK3036_H
+#define _ASM_ARCH_CRU_RK3036_H
+
+#include <common.h>
+
+#define OSC_HZ         (24 * 1000 * 1000)
+
+#define APLL_HZ                (600 * 1000000)
+#define GPLL_HZ                (594 * 1000000)
+
+#define CORE_PERI_HZ   150000000
+#define CORE_ACLK_HZ   300000000
+
+#define CPU_ACLK_HZ    150000000
+#define CPU_HCLK_HZ    300000000
+#define CPU_PCLK_HZ    300000000
+
+#define PERI_ACLK_HZ   148500000
+#define PERI_HCLK_HZ   148500000
+#define PERI_PCLK_HZ   74250000
+
+struct rk3036_cru {
+       struct rk3036_pll {
+               unsigned int con0;
+               unsigned int con1;
+               unsigned int con2;
+               unsigned int con3;
+       } pll[4];
+       unsigned int cru_mode_con;
+       unsigned int cru_clksel_con[35];
+       unsigned int cru_clkgate_con[11];
+       unsigned int reserved;
+       unsigned int cru_glb_srst_fst_value;
+       unsigned int cru_glb_srst_snd_value;
+       unsigned int reserved1[2];
+       unsigned int cru_softrst_con[9];
+       unsigned int cru_misc_con;
+       unsigned int reserved2[2];
+       unsigned int cru_glb_cnt_th;
+       unsigned int cru_sdmmc_con[2];
+       unsigned int cru_sdio_con[2];
+       unsigned int cru_emmc_con[2];
+       unsigned int reserved3;
+       unsigned int cru_rst_st;
+       unsigned int reserved4[0x23];
+       unsigned int cru_pll_mask_con;
+};
+check_member(rk3036_cru, cru_pll_mask_con, 0x01f0);
+
+struct pll_div {
+       u32 refdiv;
+       u32 fbdiv;
+       u32 postdiv1;
+       u32 postdiv2;
+       u32 frac;
+};
+
+enum {
+       /* PLLCON0*/
+       PLL_POSTDIV1_MASK       = 7,
+       PLL_POSTDIV1_SHIFT      = 12,
+       PLL_FBDIV_MASK          = 0xfff,
+       PLL_FBDIV_SHIFT         = 0,
+
+       /* PLLCON1 */
+       PLL_DSMPD_MASK          = 1,
+       PLL_DSMPD_SHIFT         = 12,
+       PLL_LOCK_STATUS_MASK    = 1,
+       PLL_LOCK_STATUS_SHIFT   = 10,
+       PLL_POSTDIV2_MASK       = 7,
+       PLL_POSTDIV2_SHIFT      = 6,
+       PLL_REFDIV_MASK         = 0x3f,
+       PLL_REFDIV_SHIFT        = 0,
+       PLL_RST_SHIFT           = 14,
+
+       /* CRU_MODE */
+       GPLL_MODE_MASK          = 3,
+       GPLL_MODE_SHIFT         = 12,
+       GPLL_MODE_SLOW          = 0,
+       GPLL_MODE_NORM,
+       GPLL_MODE_DEEP,
+       DPLL_MODE_MASK          = 1,
+       DPLL_MODE_SHIFT         = 4,
+       DPLL_MODE_SLOW          = 0,
+       DPLL_MODE_NORM,
+       APLL_MODE_MASK          = 1,
+       APLL_MODE_SHIFT         = 0,
+       APLL_MODE_SLOW          = 0,
+       APLL_MODE_NORM,
+
+       /* CRU_CLK_SEL0_CON */
+       CPU_CLK_PLL_SEL_MASK    = 3,
+       CPU_CLK_PLL_SEL_SHIFT   = 14,
+       CPU_CLK_PLL_SEL_APLL    = 0,
+       CPU_CLK_PLL_SEL_DPLL,
+       CPU_CLK_PLL_SEL_GPLL,
+       ACLK_CPU_DIV_MASK       = 0x1f,
+       ACLK_CPU_DIV_SHIFT      = 8,
+       CORE_CLK_PLL_SEL_MASK   = 1,
+       CORE_CLK_PLL_SEL_SHIFT  = 7,
+       CORE_CLK_PLL_SEL_APLL   = 0,
+       CORE_CLK_PLL_SEL_GPLL,
+       CORE_DIV_CON_MASK       = 0x1f,
+       CORE_DIV_CON_SHIFT      = 0,
+
+       /* CRU_CLK_SEL1_CON */
+       CPU_PCLK_DIV_MASK       = 7,
+       CPU_PCLK_DIV_SHIFT      = 12,
+       CPU_HCLK_DIV_MASK       = 3,
+       CPU_HCLK_DIV_SHIFT      = 8,
+       CORE_ACLK_DIV_MASK      = 7,
+       CORE_ACLK_DIV_SHIFT     = 4,
+       CORE_PERI_DIV_MASK      = 0xf,
+       CORE_PERI_DIV_SHIFT     = 0,
+
+       /* CRU_CLKSEL10_CON */
+       PERI_PLL_SEL_MASK       = 3,
+       PERI_PLL_SEL_SHIFT      = 14,
+       PERI_PLL_APLL           = 0,
+       PERI_PLL_DPLL,
+       PERI_PLL_GPLL,
+       PERI_PCLK_DIV_MASK      = 3,
+       PERI_PCLK_DIV_SHIFT     = 12,
+       PERI_HCLK_DIV_MASK      = 3,
+       PERI_HCLK_DIV_SHIFT     = 8,
+       PERI_ACLK_DIV_MASK      = 0x1f,
+       PERI_ACLK_DIV_SHIFT     = 0,
+
+       /* CRU_CLKSEL11_CON */
+       SDIO_DIV_MASK           = 0x7f,
+       SDIO_DIV_SHIFT          = 8,
+       MMC0_DIV_MASK           = 0x7f,
+       MMC0_DIV_SHIFT          = 0,
+
+       /* CRU_CLKSEL12_CON */
+       EMMC_PLL_MASK           = 3,
+       EMMC_PLL_SHIFT          = 12,
+       EMMC_SEL_APLL           = 0,
+       EMMC_SEL_DPLL,
+       EMMC_SEL_GPLL,
+       EMMC_SEL_24M,
+       SDIO_PLL_MASK           = 3,
+       SDIO_PLL_SHIFT          = 10,
+       SDIO_SEL_APLL           = 0,
+       SDIO_SEL_DPLL,
+       SDIO_SEL_GPLL,
+       SDIO_SEL_24M,
+       MMC0_PLL_MASK           = 3,
+       MMC0_PLL_SHIFT          = 8,
+       MMC0_SEL_APLL           = 0,
+       MMC0_SEL_DPLL,
+       MMC0_SEL_GPLL,
+       MMC0_SEL_24M,
+       EMMC_DIV_MASK           = 0x7f,
+       EMMC_DIV_SHIFT          = 0,
+
+       /* CRU_SOFTRST5_CON */
+       DDRCTRL_PSRST_SHIFT     = 11,
+       DDRCTRL_SRST_SHIFT      = 10,
+       DDRPHY_PSRST_SHIFT      = 9,
+       DDRPHY_SRST_SHIFT       = 8,
+};
+#endif
index 008ec100a1a8e5f7b121f402513c81e31fb7419c..4a6a4a8d728546a1ebc4d43a78dd09f4d7272f01 100644 (file)
@@ -6,5 +6,6 @@
 #
 
 obj-$(CONFIG_CLK) += clk-uclass.o
+obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
 obj-$(CONFIG_SANDBOX) += clk_sandbox.o
diff --git a/drivers/clk/clk_rk3036.c b/drivers/clk/clk_rk3036.c
new file mode 100644 (file)
index 0000000..6c802b6
--- /dev/null
@@ -0,0 +1,414 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:    GPL-2.0
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3036.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/periph.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct rk3036_clk_plat {
+       enum rk_clk_id clk_id;
+};
+
+struct rk3036_clk_priv {
+       struct rk3036_cru *cru;
+       ulong rate;
+};
+
+enum {
+       VCO_MAX_HZ      = 2400U * 1000000,
+       VCO_MIN_HZ      = 600 * 1000000,
+       OUTPUT_MAX_HZ   = 2400U * 1000000,
+       OUTPUT_MIN_HZ   = 24 * 1000000,
+};
+
+#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_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
+                        OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
+                        #hz "Hz cannot be hit with PLL "\
+                        "divisors on line " __stringify(__LINE__));
+
+/* use interge mode*/
+static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
+static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
+
+static inline unsigned int log2(unsigned int value)
+{
+       return fls(value) - 1;
+}
+
+static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
+                        const struct pll_div *div)
+{
+       int pll_id = rk_pll_id(clk_id);
+       struct rk3036_pll *pll = &cru->pll[pll_id];
+
+       /* All PLLs have same VCO and output frequency range restrictions. */
+       uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
+       uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
+
+       debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
+                vco=%u Hz, output=%u Hz\n",
+                       pll, div->fbdiv, div->refdiv, div->postdiv1,
+                       div->postdiv2, 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);
+
+       /* use interger mode */
+       rk_clrreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
+
+       rk_clrsetreg(&pll->con0,
+                    PLL_POSTDIV1_MASK << PLL_POSTDIV1_SHIFT | PLL_FBDIV_MASK,
+                    (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
+       rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK << PLL_POSTDIV2_SHIFT |
+                       PLL_REFDIV_MASK << PLL_REFDIV_SHIFT,
+                       (div->postdiv2 << PLL_POSTDIV2_SHIFT |
+                        div->refdiv << PLL_REFDIV_SHIFT));
+
+       /* waiting for pll lock */
+       while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
+               udelay(1);
+
+       return 0;
+}
+
+static void rkclk_init(struct rk3036_cru *cru)
+{
+       u32 aclk_div;
+       u32 hclk_div;
+       u32 pclk_div;
+
+       /* pll enter slow-mode */
+       rk_clrsetreg(&cru->cru_mode_con,
+                    GPLL_MODE_MASK << GPLL_MODE_SHIFT |
+                    APLL_MODE_MASK << APLL_MODE_SHIFT,
+                    GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
+                    APLL_MODE_SLOW << APLL_MODE_SHIFT);
+
+       /* init pll */
+       rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
+       rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
+
+       /*
+        * select apll as core clock pll source and
+        * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+        * core hz : apll = 1:1
+        */
+       aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
+       assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
+
+       pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
+       assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
+
+       rk_clrsetreg(&cru->cru_clksel_con[0],
+                    CORE_CLK_PLL_SEL_MASK << CORE_CLK_PLL_SEL_SHIFT |
+                    CORE_DIV_CON_MASK << CORE_DIV_CON_SHIFT,
+                    CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
+                    0 << CORE_DIV_CON_SHIFT);
+
+       rk_clrsetreg(&cru->cru_clksel_con[1],
+                    CORE_ACLK_DIV_MASK << CORE_ACLK_DIV_SHIFT |
+                    CORE_PERI_DIV_MASK << CORE_PERI_DIV_SHIFT,
+                    aclk_div << CORE_ACLK_DIV_SHIFT |
+                    pclk_div << CORE_PERI_DIV_SHIFT);
+
+       /*
+        * select apll as cpu clock pll source and
+        * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+        */
+       aclk_div = APLL_HZ / CPU_ACLK_HZ - 1;
+       assert((aclk_div + 1) * CPU_ACLK_HZ == APLL_HZ && aclk_div < 0x1f);
+
+       pclk_div = APLL_HZ / CPU_PCLK_HZ - 1;
+       assert((pclk_div + 1) * CPU_PCLK_HZ == APLL_HZ && pclk_div < 0x7);
+
+       hclk_div = APLL_HZ / CPU_HCLK_HZ - 1;
+       assert((hclk_div + 1) * CPU_HCLK_HZ == APLL_HZ && hclk_div < 0x3);
+
+       rk_clrsetreg(&cru->cru_clksel_con[0],
+                    CPU_CLK_PLL_SEL_MASK << CPU_CLK_PLL_SEL_SHIFT |
+                    ACLK_CPU_DIV_MASK << ACLK_CPU_DIV_SHIFT,
+                    CPU_CLK_PLL_SEL_APLL << CPU_CLK_PLL_SEL_SHIFT |
+                    aclk_div << ACLK_CPU_DIV_SHIFT);
+
+       rk_clrsetreg(&cru->cru_clksel_con[1],
+                    CPU_PCLK_DIV_MASK << CPU_PCLK_DIV_SHIFT |
+                    CPU_HCLK_DIV_MASK << CPU_HCLK_DIV_SHIFT,
+                    pclk_div << CPU_PCLK_DIV_SHIFT |
+                    hclk_div << CPU_HCLK_DIV_SHIFT);
+
+       /*
+        * select gpll as 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 = log2(PERI_ACLK_HZ / PERI_HCLK_HZ);
+       assert((1 << hclk_div) * PERI_HCLK_HZ ==
+               PERI_ACLK_HZ && (pclk_div < 0x4));
+
+       pclk_div = log2(PERI_ACLK_HZ / PERI_PCLK_HZ);
+       assert((1 << pclk_div) * PERI_PCLK_HZ ==
+               PERI_ACLK_HZ && pclk_div < 0x8);
+
+       rk_clrsetreg(&cru->cru_clksel_con[10],
+                    PERI_PLL_SEL_MASK << PERI_PLL_SEL_SHIFT |
+                    PERI_PCLK_DIV_MASK << PERI_PCLK_DIV_SHIFT |
+                    PERI_HCLK_DIV_MASK << PERI_HCLK_DIV_SHIFT |
+                    PERI_ACLK_DIV_MASK << PERI_ACLK_DIV_SHIFT,
+                    PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
+                    pclk_div << PERI_PCLK_DIV_SHIFT |
+                    hclk_div << PERI_HCLK_DIV_SHIFT |
+                    aclk_div << PERI_ACLK_DIV_SHIFT);
+
+       /* PLL enter normal-mode */
+       rk_clrsetreg(&cru->cru_mode_con,
+                    GPLL_MODE_MASK << GPLL_MODE_SHIFT |
+                    APLL_MODE_MASK << APLL_MODE_SHIFT,
+                    GPLL_MODE_NORM << GPLL_MODE_SHIFT |
+                    APLL_MODE_NORM << APLL_MODE_SHIFT);
+}
+
+/* Get pll rate by id */
+static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
+                                  enum rk_clk_id clk_id)
+{
+       uint32_t refdiv, fbdiv, postdiv1, postdiv2;
+       uint32_t con;
+       int pll_id = rk_pll_id(clk_id);
+       struct rk3036_pll *pll = &cru->pll[pll_id];
+       static u8 clk_shift[CLK_COUNT] = {
+               0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
+               GPLL_MODE_SHIFT, 0xff
+       };
+       static u8 clk_mask[CLK_COUNT] = {
+               0xff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xff,
+               GPLL_MODE_MASK, 0xff
+       };
+       uint shift;
+       uint mask;
+
+       con = readl(&cru->cru_mode_con);
+       shift = clk_shift[clk_id];
+       mask = clk_mask[clk_id];
+
+       switch ((con >> shift) & mask) {
+       case GPLL_MODE_SLOW:
+               return OSC_HZ;
+       case GPLL_MODE_NORM:
+
+               /* normal mode */
+               con = readl(&pll->con0);
+               postdiv1 = (con >> PLL_POSTDIV1_SHIFT) & PLL_POSTDIV1_MASK;
+               fbdiv = (con >> PLL_FBDIV_SHIFT) & PLL_FBDIV_MASK;
+               con = readl(&pll->con1);
+               postdiv2 = (con >> PLL_POSTDIV2_SHIFT) & PLL_POSTDIV2_MASK;
+               refdiv = (con >> PLL_REFDIV_SHIFT) & PLL_REFDIV_MASK;
+               return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
+       case GPLL_MODE_DEEP:
+       default:
+               return 32768;
+       }
+}
+
+static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
+                                 enum periph_id periph)
+{
+       uint src_rate;
+       uint div, mux;
+       u32 con;
+
+       switch (periph) {
+       case PERIPH_ID_EMMC:
+               con = readl(&cru->cru_clksel_con[12]);
+               mux = (con >> EMMC_PLL_SHIFT) & EMMC_PLL_MASK;
+               div = (con >> EMMC_DIV_SHIFT) & EMMC_DIV_MASK;
+               break;
+       case PERIPH_ID_SDCARD:
+               con = readl(&cru->cru_clksel_con[12]);
+               mux = (con >> MMC0_PLL_SHIFT) & MMC0_PLL_MASK;
+               div = (con >> MMC0_DIV_SHIFT) & MMC0_DIV_MASK;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
+       return DIV_TO_RATE(src_rate, div);
+}
+
+static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
+                                 enum periph_id periph, uint freq)
+{
+       int src_clk_div;
+       int mux;
+
+       debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
+
+       /* mmc clock auto divide 2 in internal */
+       src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
+
+       if (src_clk_div > 0x7f) {
+               src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
+               mux = EMMC_SEL_24M;
+       } else {
+               mux = EMMC_SEL_GPLL;
+       }
+
+       switch (periph) {
+       case PERIPH_ID_EMMC:
+               rk_clrsetreg(&cru->cru_clksel_con[12],
+                            EMMC_PLL_MASK << EMMC_PLL_SHIFT |
+                            EMMC_DIV_MASK << EMMC_DIV_SHIFT,
+                            mux << EMMC_PLL_SHIFT |
+                            (src_clk_div - 1) << EMMC_DIV_SHIFT);
+               break;
+       case PERIPH_ID_SDCARD:
+               rk_clrsetreg(&cru->cru_clksel_con[11],
+                            MMC0_PLL_MASK << MMC0_PLL_SHIFT |
+                            MMC0_DIV_MASK << MMC0_DIV_SHIFT,
+                            mux << MMC0_PLL_SHIFT |
+                            (src_clk_div - 1) << MMC0_DIV_SHIFT);
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
+}
+
+static ulong rk3036_clk_get_rate(struct udevice *dev)
+{
+       struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+       struct rk3036_clk_priv *priv = dev_get_priv(dev);
+
+       debug("%s\n", dev->name);
+       return rkclk_pll_get_rate(priv->cru, plat->clk_id);
+}
+
+static ulong rk3036_clk_set_rate(struct udevice *dev, ulong rate)
+{
+       debug("%s\n", dev->name);
+
+       return 0;
+}
+
+ulong rk3036_set_periph_rate(struct udevice *dev, int periph, ulong rate)
+{
+       struct rk3036_clk_priv *priv = dev_get_priv(dev);
+       ulong new_rate;
+
+       switch (periph) {
+       case PERIPH_ID_EMMC:
+               new_rate = rockchip_mmc_set_clk(priv->cru, clk_get_rate(dev),
+                                               periph, rate);
+               break;
+       default:
+               return -ENOENT;
+       }
+
+       return new_rate;
+}
+
+static struct clk_ops rk3036_clk_ops = {
+       .get_rate       = rk3036_clk_get_rate,
+       .set_rate       = rk3036_clk_set_rate,
+       .set_periph_rate = rk3036_set_periph_rate,
+};
+
+static int rk3036_clk_probe(struct udevice *dev)
+{
+       struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+       struct rk3036_clk_priv *priv = dev_get_priv(dev);
+
+       if (plat->clk_id != CLK_OSC) {
+               struct rk3036_clk_priv *parent_priv = dev_get_priv(dev->parent);
+
+               priv->cru = parent_priv->cru;
+               return 0;
+       }
+       priv->cru = (struct rk3036_cru *)dev_get_addr(dev);
+       rkclk_init(priv->cru);
+
+       return 0;
+}
+
+static const char *const clk_name[] = {
+       "osc",
+       "apll",
+       "dpll",
+       "cpll",
+       "gpll",
+       "mpll",
+};
+
+static int rk3036_clk_bind(struct udevice *dev)
+{
+       struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+       int pll, ret;
+
+       /* We only need to set up the root clock */
+       if (dev->of_offset == -1) {
+               plat->clk_id = CLK_OSC;
+               return 0;
+       }
+
+       /* Create devices for P main clocks */
+       for (pll = 1; pll < CLK_COUNT; pll++) {
+               struct udevice *child;
+               struct rk3036_clk_plat *cplat;
+
+               debug("%s %s\n", __func__, clk_name[pll]);
+               ret = device_bind_driver(dev, "clk_rk3036", clk_name[pll],
+                                        &child);
+               if (ret)
+                       return ret;
+
+               cplat = dev_get_platdata(child);
+               cplat->clk_id = pll;
+       }
+
+       /* The reset driver does not have a device node, so bind it here */
+       ret = device_bind_driver(gd->dm_root, "rk3036_reset", "reset", &dev);
+       if (ret)
+               debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
+
+       return 0;
+}
+
+static const struct udevice_id rk3036_clk_ids[] = {
+       { .compatible = "rockchip,rk3036-cru" },
+       { }
+};
+
+U_BOOT_DRIVER(clk_rk3036) = {
+       .name           = "clk_rk3036",
+       .id             = UCLASS_CLK,
+       .of_match       = rk3036_clk_ids,
+       .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
+       .platdata_auto_alloc_size = sizeof(struct rk3036_clk_plat),
+       .ops            = &rk3036_clk_ops,
+       .bind           = rk3036_clk_bind,
+       .probe          = rk3036_clk_probe,
+};