drm/msm/dsi: Add DSI PLL clock driver support

DSI byte clock and pixel clocks are sourced from DSI PLL.
This change adds the DSI PLL source clock driver under
common clock framework.

This change handles DSI 28nm PLL only.

Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Wentao Xu <wentaox@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 652 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
new file mode 100644
index 000000000000..eb8ac3097ff5
--- /dev/null
+++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
@@ -0,0 +1,652 @@
+/*
+ * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#include "dsi_pll.h"
+#include "dsi.xml.h"
+
+/*
+ * DSI PLL 28nm - clock diagram (eg: DSI0):
+ *
+ *         dsi0analog_postdiv_clk
+ *                             |         dsi0indirect_path_div2_clk
+ *                             |          |
+ *                   +------+  |  +----+  |  |\   dsi0byte_mux
+ *  dsi0vco_clk --o--| DIV1 |--o--| /2 |--o--| \   |
+ *                |  +------+     +----+     | m|  |  +----+
+ *                |                          | u|--o--| /4 |-- dsi0pllbyte
+ *                |                          | x|     +----+
+ *                o--------------------------| /
+ *                |                          |/
+ *                |          +------+
+ *                o----------| DIV3 |------------------------- dsi0pll
+ *                           +------+
+ */
+
+#define POLL_MAX_READS			10
+#define POLL_TIMEOUT_US		50
+
+#define NUM_PROVIDED_CLKS		2
+
+#define VCO_REF_CLK_RATE		19200000
+#define VCO_MIN_RATE			350000000
+#define VCO_MAX_RATE			750000000
+
+#define DSI_BYTE_PLL_CLK		0
+#define DSI_PIXEL_PLL_CLK		1
+
+#define LPFR_LUT_SIZE			10
+struct lpfr_cfg {
+	unsigned long vco_rate;
+	u32 resistance;
+};
+
+/* Loop filter resistance: */
+static const struct lpfr_cfg lpfr_lut[LPFR_LUT_SIZE] = {
+	{ 479500000,  8 },
+	{ 480000000, 11 },
+	{ 575500000,  8 },
+	{ 576000000, 12 },
+	{ 610500000,  8 },
+	{ 659500000,  9 },
+	{ 671500000, 10 },
+	{ 672000000, 14 },
+	{ 708500000, 10 },
+	{ 750000000, 11 },
+};
+
+struct pll_28nm_cached_state {
+	unsigned long vco_rate;
+	u8 postdiv3;
+	u8 postdiv1;
+	u8 byte_mux;
+};
+
+struct dsi_pll_28nm {
+	struct msm_dsi_pll base;
+
+	int id;
+	struct platform_device *pdev;
+	void __iomem *mmio;
+
+	int vco_delay;
+
+	/* private clocks: */
+	struct clk *clks[NUM_DSI_CLOCKS_MAX];
+	u32 num_clks;
+
+	/* clock-provider: */
+	struct clk *provided_clks[NUM_PROVIDED_CLKS];
+	struct clk_onecell_data clk_data;
+
+	struct pll_28nm_cached_state cached_state;
+};
+
+#define to_pll_28nm(x)	container_of(x, struct dsi_pll_28nm, base)
+
+static bool pll_28nm_poll_for_ready(struct dsi_pll_28nm *pll_28nm,
+				u32 nb_tries, u32 timeout_us)
+{
+	bool pll_locked = false;
+	u32 val;
+
+	while (nb_tries--) {
+		val = pll_read(pll_28nm->mmio + REG_DSI_28nm_PHY_PLL_STATUS);
+		pll_locked = !!(val & DSI_28nm_PHY_PLL_STATUS_PLL_RDY);
+
+		if (pll_locked)
+			break;
+
+		udelay(timeout_us);
+	}
+	DBG("DSI PLL is %slocked", pll_locked ? "" : "*not* ");
+
+	return pll_locked;
+}
+
+static void pll_28nm_software_reset(struct dsi_pll_28nm *pll_28nm)
+{
+	void __iomem *base = pll_28nm->mmio;
+
+	/*
+	 * Add HW recommended delays after toggling the software
+	 * reset bit off and back on.
+	 */
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_TEST_CFG,
+			DSI_28nm_PHY_PLL_TEST_CFG_PLL_SW_RESET, 1);
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_TEST_CFG, 0x00, 1);
+}
+
+/*
+ * Clock Callbacks
+ */
+static int dsi_pll_28nm_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	struct device *dev = &pll_28nm->pdev->dev;
+	void __iomem *base = pll_28nm->mmio;
+	unsigned long div_fbx1000, gen_vco_clk;
+	u32 refclk_cfg, frac_n_mode, frac_n_value;
+	u32 sdm_cfg0, sdm_cfg1, sdm_cfg2, sdm_cfg3;
+	u32 cal_cfg10, cal_cfg11;
+	u32 rem;
+	int i;
+
+	VERB("rate=%lu, parent's=%lu", rate, parent_rate);
+
+	/* Force postdiv2 to be div-4 */
+	pll_write(base + REG_DSI_28nm_PHY_PLL_POSTDIV2_CFG, 3);
+
+	/* Configure the Loop filter resistance */
+	for (i = 0; i < LPFR_LUT_SIZE; i++)
+		if (rate <= lpfr_lut[i].vco_rate)
+			break;
+	if (i == LPFR_LUT_SIZE) {
+		dev_err(dev, "unable to get loop filter resistance. vco=%lu\n",
+				rate);
+		return -EINVAL;
+	}
+	pll_write(base + REG_DSI_28nm_PHY_PLL_LPFR_CFG, lpfr_lut[i].resistance);
+
+	/* Loop filter capacitance values : c1 and c2 */
+	pll_write(base + REG_DSI_28nm_PHY_PLL_LPFC1_CFG, 0x70);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_LPFC2_CFG, 0x15);
+
+	rem = rate % VCO_REF_CLK_RATE;
+	if (rem) {
+		refclk_cfg = DSI_28nm_PHY_PLL_REFCLK_CFG_DBLR;
+		frac_n_mode = 1;
+		div_fbx1000 = rate / (VCO_REF_CLK_RATE / 500);
+		gen_vco_clk = div_fbx1000 * (VCO_REF_CLK_RATE / 500);
+	} else {
+		refclk_cfg = 0x0;
+		frac_n_mode = 0;
+		div_fbx1000 = rate / (VCO_REF_CLK_RATE / 1000);
+		gen_vco_clk = div_fbx1000 * (VCO_REF_CLK_RATE / 1000);
+	}
+
+	DBG("refclk_cfg = %d", refclk_cfg);
+
+	rem = div_fbx1000 % 1000;
+	frac_n_value = (rem << 16) / 1000;
+
+	DBG("div_fb = %lu", div_fbx1000);
+	DBG("frac_n_value = %d", frac_n_value);
+
+	DBG("Generated VCO Clock: %lu", gen_vco_clk);
+	rem = 0;
+	sdm_cfg1 = pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG1);
+	sdm_cfg1 &= ~DSI_28nm_PHY_PLL_SDM_CFG1_DC_OFFSET__MASK;
+	if (frac_n_mode) {
+		sdm_cfg0 = 0x0;
+		sdm_cfg0 |= DSI_28nm_PHY_PLL_SDM_CFG0_BYP_DIV(0);
+		sdm_cfg1 |= DSI_28nm_PHY_PLL_SDM_CFG1_DC_OFFSET(
+				(u32)(((div_fbx1000 / 1000) & 0x3f) - 1));
+		sdm_cfg3 = frac_n_value >> 8;
+		sdm_cfg2 = frac_n_value & 0xff;
+	} else {
+		sdm_cfg0 = DSI_28nm_PHY_PLL_SDM_CFG0_BYP;
+		sdm_cfg0 |= DSI_28nm_PHY_PLL_SDM_CFG0_BYP_DIV(
+				(u32)(((div_fbx1000 / 1000) & 0x3f) - 1));
+		sdm_cfg1 |= DSI_28nm_PHY_PLL_SDM_CFG1_DC_OFFSET(0);
+		sdm_cfg2 = 0;
+		sdm_cfg3 = 0;
+	}
+
+	DBG("sdm_cfg0=%d", sdm_cfg0);
+	DBG("sdm_cfg1=%d", sdm_cfg1);
+	DBG("sdm_cfg2=%d", sdm_cfg2);
+	DBG("sdm_cfg3=%d", sdm_cfg3);
+
+	cal_cfg11 = (u32)(gen_vco_clk / (256 * 1000000));
+	cal_cfg10 = (u32)((gen_vco_clk % (256 * 1000000)) / 1000000);
+	DBG("cal_cfg10=%d, cal_cfg11=%d", cal_cfg10, cal_cfg11);
+
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CHGPUMP_CFG, 0x02);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG3,    0x2b);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG4,    0x06);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2,  0x0d);
+
+	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG1, sdm_cfg1);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG2,
+		DSI_28nm_PHY_PLL_SDM_CFG2_FREQ_SEED_7_0(sdm_cfg2));
+	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG3,
+		DSI_28nm_PHY_PLL_SDM_CFG3_FREQ_SEED_15_8(sdm_cfg3));
+	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG4, 0x00);
+
+	/* Add hardware recommended delay for correct PLL configuration */
+	if (pll_28nm->vco_delay)
+		udelay(pll_28nm->vco_delay);
+
+	pll_write(base + REG_DSI_28nm_PHY_PLL_REFCLK_CFG, refclk_cfg);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_PWRGEN_CFG, 0x00);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_VCOLPF_CFG, 0x31);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_SDM_CFG0,   sdm_cfg0);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG0,   0x12);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG6,   0x30);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG7,   0x00);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG8,   0x60);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG9,   0x00);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG10,  cal_cfg10 & 0xff);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG11,  cal_cfg11 & 0xff);
+	pll_write(base + REG_DSI_28nm_PHY_PLL_EFUSE_CFG,  0x20);
+
+	return 0;
+}
+
+static int dsi_pll_28nm_clk_is_enabled(struct clk_hw *hw)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+
+	return pll_28nm_poll_for_ready(pll_28nm, POLL_MAX_READS,
+					POLL_TIMEOUT_US);
+}
+
+static unsigned long dsi_pll_28nm_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	void __iomem *base = pll_28nm->mmio;
+	u32 sdm0, doubler, sdm_byp_div;
+	u32 sdm_dc_off, sdm_freq_seed, sdm2, sdm3;
+	u32 ref_clk = VCO_REF_CLK_RATE;
+	unsigned long vco_rate;
+
+	VERB("parent_rate=%lu", parent_rate);
+
+	/* Check to see if the ref clk doubler is enabled */
+	doubler = pll_read(base + REG_DSI_28nm_PHY_PLL_REFCLK_CFG) &
+			DSI_28nm_PHY_PLL_REFCLK_CFG_DBLR;
+	ref_clk += (doubler * VCO_REF_CLK_RATE);
+
+	/* see if it is integer mode or sdm mode */
+	sdm0 = pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG0);
+	if (sdm0 & DSI_28nm_PHY_PLL_SDM_CFG0_BYP) {
+		/* integer mode */
+		sdm_byp_div = FIELD(
+				pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG0),
+				DSI_28nm_PHY_PLL_SDM_CFG0_BYP_DIV) + 1;
+		vco_rate = ref_clk * sdm_byp_div;
+	} else {
+		/* sdm mode */
+		sdm_dc_off = FIELD(
+				pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG1),
+				DSI_28nm_PHY_PLL_SDM_CFG1_DC_OFFSET);
+		DBG("sdm_dc_off = %d", sdm_dc_off);
+		sdm2 = FIELD(pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG2),
+				DSI_28nm_PHY_PLL_SDM_CFG2_FREQ_SEED_7_0);
+		sdm3 = FIELD(pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG3),
+				DSI_28nm_PHY_PLL_SDM_CFG3_FREQ_SEED_15_8);
+		sdm_freq_seed = (sdm3 << 8) | sdm2;
+		DBG("sdm_freq_seed = %d", sdm_freq_seed);
+
+		vco_rate = (ref_clk * (sdm_dc_off + 1)) +
+			mult_frac(ref_clk, sdm_freq_seed, BIT(16));
+		DBG("vco rate = %lu", vco_rate);
+	}
+
+	DBG("returning vco rate = %lu", vco_rate);
+
+	return vco_rate;
+}
+
+static const struct clk_ops clk_ops_dsi_pll_28nm_vco = {
+	.round_rate = msm_dsi_pll_helper_clk_round_rate,
+	.set_rate = dsi_pll_28nm_clk_set_rate,
+	.recalc_rate = dsi_pll_28nm_clk_recalc_rate,
+	.prepare = msm_dsi_pll_helper_clk_prepare,
+	.unprepare = msm_dsi_pll_helper_clk_unprepare,
+	.is_enabled = dsi_pll_28nm_clk_is_enabled,
+};
+
+/*
+ * PLL Callbacks
+ */
+static int dsi_pll_28nm_enable_seq_hpm(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	struct device *dev = &pll_28nm->pdev->dev;
+	void __iomem *base = pll_28nm->mmio;
+	u32 max_reads = 5, timeout_us = 100;
+	bool locked;
+	u32 val;
+	int i;
+
+	DBG("id=%d", pll_28nm->id);
+
+	pll_28nm_software_reset(pll_28nm);
+
+	/*
+	 * PLL power up sequence.
+	 * Add necessary delays recommended by hardware.
+	 */
+	val = DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRDN_B;
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 1);
+
+	val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRGEN_PWRDN_B;
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 200);
+
+	val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 500);
+
+	val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_ENABLE;
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 600);
+
+	for (i = 0; i < 2; i++) {
+		/* DSI Uniphy lock detect setting */
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2,
+				0x0c, 100);
+		pll_write(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2, 0x0d);
+
+		/* poll for PLL ready status */
+		locked = pll_28nm_poll_for_ready(pll_28nm,
+						max_reads, timeout_us);
+		if (locked)
+			break;
+
+		pll_28nm_software_reset(pll_28nm);
+
+		/*
+		 * PLL power up sequence.
+		 * Add necessary delays recommended by hardware.
+		 */
+		val = DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRDN_B;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 1);
+
+		val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRGEN_PWRDN_B;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 200);
+
+		val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 250);
+
+		val &= ~DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 200);
+
+		val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 500);
+
+		val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_ENABLE;
+		pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 600);
+	}
+
+	if (unlikely(!locked))
+		dev_err(dev, "DSI PLL lock failed\n");
+	else
+		DBG("DSI PLL Lock success");
+
+	return locked ? 0 : -EINVAL;
+}
+
+static int dsi_pll_28nm_enable_seq_lp(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	struct device *dev = &pll_28nm->pdev->dev;
+	void __iomem *base = pll_28nm->mmio;
+	bool locked;
+	u32 max_reads = 10, timeout_us = 50;
+	u32 val;
+
+	DBG("id=%d", pll_28nm->id);
+
+	pll_28nm_software_reset(pll_28nm);
+
+	/*
+	 * PLL power up sequence.
+	 * Add necessary delays recommended by hardware.
+	 */
+	pll_write_ndelay(base + REG_DSI_28nm_PHY_PLL_CAL_CFG1, 0x34, 500);
+
+	val = DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRDN_B;
+	pll_write_ndelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 500);
+
+	val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRGEN_PWRDN_B;
+	pll_write_ndelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 500);
+
+	val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B |
+		DSI_28nm_PHY_PLL_GLB_CFG_PLL_ENABLE;
+	pll_write_ndelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 500);
+
+	/* DSI PLL toggle lock detect setting */
+	pll_write_ndelay(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2, 0x04, 500);
+	pll_write_udelay(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2, 0x05, 512);
+
+	locked = pll_28nm_poll_for_ready(pll_28nm, max_reads, timeout_us);
+
+	if (unlikely(!locked))
+		dev_err(dev, "DSI PLL lock failed\n");
+	else
+		DBG("DSI PLL lock success");
+
+	return locked ? 0 : -EINVAL;
+}
+
+static void dsi_pll_28nm_disable_seq(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+
+	DBG("id=%d", pll_28nm->id);
+	pll_write(pll_28nm->mmio + REG_DSI_28nm_PHY_PLL_GLB_CFG, 0x00);
+}
+
+static void dsi_pll_28nm_save_state(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	struct pll_28nm_cached_state *cached_state = &pll_28nm->cached_state;
+	void __iomem *base = pll_28nm->mmio;
+
+	cached_state->postdiv3 =
+			pll_read(base + REG_DSI_28nm_PHY_PLL_POSTDIV3_CFG);
+	cached_state->postdiv1 =
+			pll_read(base + REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG);
+	cached_state->byte_mux = pll_read(base + REG_DSI_28nm_PHY_PLL_VREG_CFG);
+	cached_state->vco_rate = __clk_get_rate(pll->clk_hw.clk);
+}
+
+static int dsi_pll_28nm_restore_state(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	struct pll_28nm_cached_state *cached_state = &pll_28nm->cached_state;
+	void __iomem *base = pll_28nm->mmio;
+	int ret;
+
+	if ((cached_state->vco_rate != 0) &&
+		(cached_state->vco_rate == __clk_get_rate(pll->clk_hw.clk))) {
+		ret = dsi_pll_28nm_clk_set_rate(&pll->clk_hw,
+						cached_state->vco_rate, 0);
+		if (ret) {
+			dev_err(&pll_28nm->pdev->dev,
+				"restore vco rate failed. ret=%d\n", ret);
+			return ret;
+		}
+
+		pll_write(base + REG_DSI_28nm_PHY_PLL_POSTDIV3_CFG,
+				cached_state->postdiv3);
+		pll_write(base + REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG,
+				cached_state->postdiv1);
+		pll_write(base + REG_DSI_28nm_PHY_PLL_VREG_CFG,
+				cached_state->byte_mux);
+
+		cached_state->vco_rate = 0;
+	}
+
+	return 0;
+}
+
+static int dsi_pll_28nm_get_provider(struct msm_dsi_pll *pll,
+				struct clk **byte_clk_provider,
+				struct clk **pixel_clk_provider)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+
+	if (byte_clk_provider)
+		*byte_clk_provider = pll_28nm->provided_clks[DSI_BYTE_PLL_CLK];
+	if (pixel_clk_provider)
+		*pixel_clk_provider =
+				pll_28nm->provided_clks[DSI_PIXEL_PLL_CLK];
+
+	return 0;
+}
+
+static void dsi_pll_28nm_destroy(struct msm_dsi_pll *pll)
+{
+	struct dsi_pll_28nm *pll_28nm = to_pll_28nm(pll);
+	int i;
+
+	msm_dsi_pll_helper_unregister_clks(pll_28nm->pdev,
+					pll_28nm->clks, pll_28nm->num_clks);
+
+	for (i = 0; i < NUM_PROVIDED_CLKS; i++)
+		pll_28nm->provided_clks[i] = NULL;
+
+	pll_28nm->num_clks = 0;
+	pll_28nm->clk_data.clks = NULL;
+	pll_28nm->clk_data.clk_num = 0;
+}
+
+static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm)
+{
+	char clk_name[32], parent1[32], parent2[32], vco_name[32];
+	struct clk_init_data vco_init = {
+		.parent_names = (const char *[]){ "xo" },
+		.num_parents = 1,
+		.name = vco_name,
+		.ops = &clk_ops_dsi_pll_28nm_vco,
+	};
+	struct device *dev = &pll_28nm->pdev->dev;
+	struct clk **clks = pll_28nm->clks;
+	struct clk **provided_clks = pll_28nm->provided_clks;
+	int num = 0;
+	int ret;
+
+	DBG("%d", pll_28nm->id);
+
+	snprintf(vco_name, 32, "dsi%dvco_clk", pll_28nm->id);
+	pll_28nm->base.clk_hw.init = &vco_init;
+	clks[num++] = clk_register(dev, &pll_28nm->base.clk_hw);
+
+	snprintf(clk_name, 32, "dsi%danalog_postdiv_clk", pll_28nm->id);
+	snprintf(parent1, 32, "dsi%dvco_clk", pll_28nm->id);
+	clks[num++] = clk_register_divider(dev, clk_name,
+			parent1, CLK_SET_RATE_PARENT,
+			pll_28nm->mmio +
+			REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG,
+			0, 4, 0, NULL);
+
+	snprintf(clk_name, 32, "dsi%dindirect_path_div2_clk", pll_28nm->id);
+	snprintf(parent1, 32, "dsi%danalog_postdiv_clk", pll_28nm->id);
+	clks[num++] = clk_register_fixed_factor(dev, clk_name,
+			parent1, CLK_SET_RATE_PARENT,
+			1, 2);
+
+	snprintf(clk_name, 32, "dsi%dpll", pll_28nm->id);
+	snprintf(parent1, 32, "dsi%dvco_clk", pll_28nm->id);
+	clks[num++] = provided_clks[DSI_PIXEL_PLL_CLK] =
+			clk_register_divider(dev, clk_name,
+				parent1, 0, pll_28nm->mmio +
+				REG_DSI_28nm_PHY_PLL_POSTDIV3_CFG,
+				0, 8, 0, NULL);
+
+	snprintf(clk_name, 32, "dsi%dbyte_mux", pll_28nm->id);
+	snprintf(parent1, 32, "dsi%dvco_clk", pll_28nm->id);
+	snprintf(parent2, 32, "dsi%dindirect_path_div2_clk", pll_28nm->id);
+	clks[num++] = clk_register_mux(dev, clk_name,
+			(const char *[]){
+				parent1, parent2
+			}, 2, CLK_SET_RATE_PARENT, pll_28nm->mmio +
+			REG_DSI_28nm_PHY_PLL_VREG_CFG, 1, 1, 0, NULL);
+
+	snprintf(clk_name, 32, "dsi%dpllbyte", pll_28nm->id);
+	snprintf(parent1, 32, "dsi%dbyte_mux", pll_28nm->id);
+	clks[num++] = provided_clks[DSI_BYTE_PLL_CLK] =
+			clk_register_fixed_factor(dev, clk_name,
+				parent1, CLK_SET_RATE_PARENT, 1, 4);
+
+	pll_28nm->num_clks = num;
+
+	pll_28nm->clk_data.clk_num = NUM_PROVIDED_CLKS;
+	pll_28nm->clk_data.clks = provided_clks;
+
+	ret = of_clk_add_provider(dev->of_node,
+			of_clk_src_onecell_get, &pll_28nm->clk_data);
+	if (ret) {
+		dev_err(dev, "failed to register clk provider: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+struct msm_dsi_pll *msm_dsi_pll_28nm_init(struct platform_device *pdev,
+					enum msm_dsi_phy_type type, int id)
+{
+	struct dsi_pll_28nm *pll_28nm;
+	struct msm_dsi_pll *pll;
+	int ret;
+
+	if (!pdev)
+		return ERR_PTR(-ENODEV);
+
+	pll_28nm = devm_kzalloc(&pdev->dev, sizeof(*pll_28nm), GFP_KERNEL);
+	if (!pll_28nm)
+		return ERR_PTR(-ENOMEM);
+
+	pll_28nm->pdev = pdev;
+	pll_28nm->id = id;
+
+	pll_28nm->mmio = msm_ioremap(pdev, "dsi_pll", "DSI_PLL");
+	if (IS_ERR_OR_NULL(pll_28nm->mmio)) {
+		dev_err(&pdev->dev, "%s: failed to map pll base\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	pll = &pll_28nm->base;
+	pll->min_rate = VCO_MIN_RATE;
+	pll->max_rate = VCO_MAX_RATE;
+	pll->get_provider = dsi_pll_28nm_get_provider;
+	pll->destroy = dsi_pll_28nm_destroy;
+	pll->disable_seq = dsi_pll_28nm_disable_seq;
+	pll->save_state = dsi_pll_28nm_save_state;
+	pll->restore_state = dsi_pll_28nm_restore_state;
+
+	if (type == MSM_DSI_PHY_28NM_HPM) {
+		pll_28nm->vco_delay = 1;
+
+		pll->en_seq_cnt = 3;
+		pll->enable_seqs[0] = dsi_pll_28nm_enable_seq_hpm;
+		pll->enable_seqs[1] = dsi_pll_28nm_enable_seq_hpm;
+		pll->enable_seqs[2] = dsi_pll_28nm_enable_seq_hpm;
+	} else if (type == MSM_DSI_PHY_28NM_LP) {
+		pll_28nm->vco_delay = 1000;
+
+		pll->en_seq_cnt = 1;
+		pll->enable_seqs[0] = dsi_pll_28nm_enable_seq_lp;
+	} else {
+		dev_err(&pdev->dev, "phy type (%d) is not 28nm\n", type);
+		return ERR_PTR(-EINVAL);
+	}
+
+	ret = pll_28nm_register(pll_28nm);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register PLL: %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	return pll;
+}
+