Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC driver updates from Arnd Bergmann:
 "As usual, the drivers/tee and drivers/reset subsystems get merged
  here, with the expected set of smaller updates and some new hardware
  support. The tee subsystem now supports device drivers to be attached
  to a tee, the first example here is a random number driver with its
  implementation in the secure world.

  Three new power domain drivers get added for specific chip families:
   - Broadcom BCM283x chips (used in Raspberry Pi)
   - Qualcomm Snapdragon phone chips
   - Xilinx ZynqMP FPGA SoCs

  One new driver is added to talk to the BPMP firmware on NVIDIA
  Tegra210

  Existing drivers are extended for new SoC variants from NXP, NVIDIA,
  Amlogic and Qualcomm"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (113 commits)
  tee: optee: update optee_msg.h and optee_smc.h to dual license
  tee: add cancellation support to client interface
  dpaa2-eth: configure the cache stashing amount on a queue
  soc: fsl: dpio: configure cache stashing destination
  soc: fsl: dpio: enable frame data cache stashing per software portal
  soc: fsl: guts: make fsl_guts_get_svr() static
  hwrng: make symbol 'optee_rng_id_table' static
  tee: optee: Fix unsigned comparison with less than zero
  hwrng: Fix unsigned comparison with less than zero
  tee: fix possible error pointer ctx dereferencing
  hwrng: optee: Initialize some structs using memset instead of braces
  tee: optee: Initialize some structs using memset instead of braces
  soc: fsl: dpio: fix memory leak of a struct qbman on error exit path
  clk: tegra: dfll: Make symbol 'tegra210_cpu_cvb_tables' static
  soc: qcom: llcc-slice: Fix typos
  qcom: soc: llcc-slice: Consolidate some code
  qcom: soc: llcc-slice: Clear the global drv_data pointer on error
  drivers: soc: xilinx: Add ZynqMP power domain driver
  firmware: xilinx: Add APIs to control node status/power
  dt-bindings: power: Add ZynqMP power domain bindings
  ...

1 files changed, 387 insertions, 72 deletions

diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
index 609e363dabf8..0400e5b1d627 100644
--- a/drivers/clk/tegra/clk-dfll.c
+++ b/drivers/clk/tegra/clk-dfll.c
@@ -1,7 +1,7 @@
 /*
  * clk-dfll.c - Tegra DFLL clock source common code
  *
- * Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved.
+ * Copyright (C) 2012-2019 NVIDIA Corporation. All rights reserved.
  *
  * Aleksandr Frid <afrid@nvidia.com>
  * Paul Walmsley <pwalmsley@nvidia.com>
@@ -47,6 +47,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
@@ -243,6 +244,12 @@ enum dfll_tune_range {
 	DFLL_TUNE_LOW = 1,
 };
 
+
+enum tegra_dfll_pmu_if {
+	TEGRA_DFLL_PMU_I2C = 0,
+	TEGRA_DFLL_PMU_PWM = 1,
+};
+
 /**
  * struct dfll_rate_req - target DFLL rate request data
  * @rate: target frequency, after the postscaling
@@ -300,10 +307,19 @@ struct tegra_dfll {
 	u32				i2c_reg;
 	u32				i2c_slave_addr;
 
-	/* i2c_lut array entries are regulator framework selectors */
-	unsigned			i2c_lut[MAX_DFLL_VOLTAGES];
-	int				i2c_lut_size;
-	u8				lut_min, lut_max, lut_safe;
+	/* lut array entries are regulator framework selectors or PWM values*/
+	unsigned			lut[MAX_DFLL_VOLTAGES];
+	unsigned long			lut_uv[MAX_DFLL_VOLTAGES];
+	int				lut_size;
+	u8				lut_bottom, lut_min, lut_max, lut_safe;
+
+	/* PWM interface */
+	enum tegra_dfll_pmu_if		pmu_if;
+	unsigned long			pwm_rate;
+	struct pinctrl			*pwm_pin;
+	struct pinctrl_state		*pwm_enable_state;
+	struct pinctrl_state		*pwm_disable_state;
+	u32				reg_init_uV;
 };
 
 #define clk_hw_to_dfll(_hw) container_of(_hw, struct tegra_dfll, dfll_clk_hw)
@@ -490,6 +506,34 @@ static void dfll_set_mode(struct tegra_dfll *td,
 }
 
 /*
+ * DVCO rate control
+ */
+
+static unsigned long get_dvco_rate_below(struct tegra_dfll *td, u8 out_min)
+{
+	struct dev_pm_opp *opp;
+	unsigned long rate, prev_rate;
+	unsigned long uv, min_uv;
+
+	min_uv = td->lut_uv[out_min];
+	for (rate = 0, prev_rate = 0; ; rate++) {
+		opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
+		if (IS_ERR(opp))
+			break;
+
+		uv = dev_pm_opp_get_voltage(opp);
+		dev_pm_opp_put(opp);
+
+		if (uv && uv > min_uv)
+			return prev_rate;
+
+		prev_rate = rate;
+	}
+
+	return prev_rate;
+}
+
+/*
  * DFLL-to-I2C controller interface
  */
 
@@ -518,6 +562,118 @@ static int dfll_i2c_set_output_enabled(struct tegra_dfll *td, bool enable)
 	return 0;
 }
 
+
+/*
+ * DFLL-to-PWM controller interface
+ */
+
+/**
+ * dfll_pwm_set_output_enabled - enable/disable PWM voltage requests
+ * @td: DFLL instance
+ * @enable: whether to enable or disable the PWM voltage requests
+ *
+ * Set the master enable control for PWM control value updates. If disabled,
+ * then the PWM signal is not driven. Also configure the PWM output pad
+ * to the appropriate state.
+ */
+static int dfll_pwm_set_output_enabled(struct tegra_dfll *td, bool enable)
+{
+	int ret;
+	u32 val, div;
+
+	if (enable) {
+		ret = pinctrl_select_state(td->pwm_pin, td->pwm_enable_state);
+		if (ret < 0) {
+			dev_err(td->dev, "setting enable state failed\n");
+			return -EINVAL;
+		}
+		val = dfll_readl(td, DFLL_OUTPUT_CFG);
+		val &= ~DFLL_OUTPUT_CFG_PWM_DIV_MASK;
+		div = DIV_ROUND_UP(td->ref_rate, td->pwm_rate);
+		val |= (div << DFLL_OUTPUT_CFG_PWM_DIV_SHIFT)
+				& DFLL_OUTPUT_CFG_PWM_DIV_MASK;
+		dfll_writel(td, val, DFLL_OUTPUT_CFG);
+		dfll_wmb(td);
+
+		val |= DFLL_OUTPUT_CFG_PWM_ENABLE;
+		dfll_writel(td, val, DFLL_OUTPUT_CFG);
+		dfll_wmb(td);
+	} else {
+		ret = pinctrl_select_state(td->pwm_pin, td->pwm_disable_state);
+		if (ret < 0)
+			dev_warn(td->dev, "setting disable state failed\n");
+
+		val = dfll_readl(td, DFLL_OUTPUT_CFG);
+		val &= ~DFLL_OUTPUT_CFG_PWM_ENABLE;
+		dfll_writel(td, val, DFLL_OUTPUT_CFG);
+		dfll_wmb(td);
+	}
+
+	return 0;
+}
+
+/**
+ * dfll_set_force_output_value - set fixed value for force output
+ * @td: DFLL instance
+ * @out_val: value to force output
+ *
+ * Set the fixed value for force output, DFLL will output this value when
+ * force output is enabled.
+ */
+static u32 dfll_set_force_output_value(struct tegra_dfll *td, u8 out_val)
+{
+	u32 val = dfll_readl(td, DFLL_OUTPUT_FORCE);
+
+	val = (val & DFLL_OUTPUT_FORCE_ENABLE) | (out_val & OUT_MASK);
+	dfll_writel(td, val, DFLL_OUTPUT_FORCE);
+	dfll_wmb(td);
+
+	return dfll_readl(td, DFLL_OUTPUT_FORCE);
+}
+
+/**
+ * dfll_set_force_output_enabled - enable/disable force output
+ * @td: DFLL instance
+ * @enable: whether to enable or disable the force output
+ *
+ * Set the enable control for fouce output with fixed value.
+ */
+static void dfll_set_force_output_enabled(struct tegra_dfll *td, bool enable)
+{
+	u32 val = dfll_readl(td, DFLL_OUTPUT_FORCE);
+
+	if (enable)
+		val |= DFLL_OUTPUT_FORCE_ENABLE;
+	else
+		val &= ~DFLL_OUTPUT_FORCE_ENABLE;
+
+	dfll_writel(td, val, DFLL_OUTPUT_FORCE);
+	dfll_wmb(td);
+}
+
+/**
+ * dfll_force_output - force output a fixed value
+ * @td: DFLL instance
+ * @out_sel: value to force output
+ *
+ * Set the fixed value for force output, DFLL will output this value.
+ */
+static int dfll_force_output(struct tegra_dfll *td, unsigned int out_sel)
+{
+	u32 val;
+
+	if (out_sel > OUT_MASK)
+		return -EINVAL;
+
+	val = dfll_set_force_output_value(td, out_sel);
+	if ((td->mode < DFLL_CLOSED_LOOP) &&
+	    !(val & DFLL_OUTPUT_FORCE_ENABLE)) {
+		dfll_set_force_output_enabled(td, true);
+	}
+
+	return 0;
+}
+
 /**
  * dfll_load_lut - load the voltage lookup table
  * @td: struct tegra_dfll *
@@ -539,7 +695,7 @@ static void dfll_load_i2c_lut(struct tegra_dfll *td)
 			lut_index = i;
 
 		val = regulator_list_hardware_vsel(td->vdd_reg,
-						     td->i2c_lut[lut_index]);
+						     td->lut[lut_index]);
 		__raw_writel(val, td->lut_base + i * 4);
 	}
 
@@ -594,24 +750,41 @@ static void dfll_init_out_if(struct tegra_dfll *td)
 {
 	u32 val;
 
-	td->lut_min = 0;
-	td->lut_max = td->i2c_lut_size - 1;
-	td->lut_safe = td->lut_min + 1;
+	td->lut_min = td->lut_bottom;
+	td->lut_max = td->lut_size - 1;
+	td->lut_safe = td->lut_min + (td->lut_min < td->lut_max ? 1 : 0);
+
+	/* clear DFLL_OUTPUT_CFG before setting new value */
+	dfll_writel(td, 0, DFLL_OUTPUT_CFG);
+	dfll_wmb(td);
 
-	dfll_i2c_writel(td, 0, DFLL_OUTPUT_CFG);
 	val = (td->lut_safe << DFLL_OUTPUT_CFG_SAFE_SHIFT) |
-		(td->lut_max << DFLL_OUTPUT_CFG_MAX_SHIFT) |
-		(td->lut_min << DFLL_OUTPUT_CFG_MIN_SHIFT);
-	dfll_i2c_writel(td, val, DFLL_OUTPUT_CFG);
-	dfll_i2c_wmb(td);
+	      (td->lut_max << DFLL_OUTPUT_CFG_MAX_SHIFT) |
+	      (td->lut_min << DFLL_OUTPUT_CFG_MIN_SHIFT);
+	dfll_writel(td, val, DFLL_OUTPUT_CFG);
+	dfll_wmb(td);
 
 	dfll_writel(td, 0, DFLL_OUTPUT_FORCE);
 	dfll_i2c_writel(td, 0, DFLL_INTR_EN);
 	dfll_i2c_writel(td, DFLL_INTR_MAX_MASK | DFLL_INTR_MIN_MASK,
 			DFLL_INTR_STS);
 
-	dfll_load_i2c_lut(td);
-	dfll_init_i2c_if(td);
+	if (td->pmu_if == TEGRA_DFLL_PMU_PWM) {
+		u32 vinit = td->reg_init_uV;
+		int vstep = td->soc->alignment.step_uv;
+		unsigned long vmin = td->lut_uv[0];
+
+		/* set initial voltage */
+		if ((vinit >= vmin) && vstep) {
+			unsigned int vsel;
+
+			vsel = DIV_ROUND_UP((vinit - vmin), vstep);
+			dfll_force_output(td, vsel);
+		}
+	} else {
+		dfll_load_i2c_lut(td);
+		dfll_init_i2c_if(td);
+	}
 }
 
 /*
@@ -631,17 +804,17 @@ static void dfll_init_out_if(struct tegra_dfll *td)
 static int find_lut_index_for_rate(struct tegra_dfll *td, unsigned long rate)
 {
 	struct dev_pm_opp *opp;
-	int i, uv;
+	int i, align_step;
 
 	opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
 	if (IS_ERR(opp))
 		return PTR_ERR(opp);
 
-	uv = dev_pm_opp_get_voltage(opp);
+	align_step = dev_pm_opp_get_voltage(opp) / td->soc->alignment.step_uv;
 	dev_pm_opp_put(opp);
 
-	for (i = 0; i < td->i2c_lut_size; i++) {
-		if (regulator_list_voltage(td->vdd_reg, td->i2c_lut[i]) == uv)
+	for (i = td->lut_bottom; i < td->lut_size; i++) {
+		if ((td->lut_uv[i] / td->soc->alignment.step_uv) >= align_step)
 			return i;
 	}
 
@@ -863,9 +1036,14 @@ static int dfll_lock(struct tegra_dfll *td)
 			return -EINVAL;
 		}
 
-		dfll_i2c_set_output_enabled(td, true);
+		if (td->pmu_if == TEGRA_DFLL_PMU_PWM)
+			dfll_pwm_set_output_enabled(td, true);
+		else
+			dfll_i2c_set_output_enabled(td, true);
+
 		dfll_set_mode(td, DFLL_CLOSED_LOOP);
 		dfll_set_frequency_request(td, req);
+		dfll_set_force_output_enabled(td, false);
 		return 0;
 
 	default:
@@ -889,7 +1067,10 @@ static int dfll_unlock(struct tegra_dfll *td)
 	case DFLL_CLOSED_LOOP:
 		dfll_set_open_loop_config(td);
 		dfll_set_mode(td, DFLL_OPEN_LOOP);
-		dfll_i2c_set_output_enabled(td, false);
+		if (td->pmu_if == TEGRA_DFLL_PMU_PWM)
+			dfll_pwm_set_output_enabled(td, false);
+		else
+			dfll_i2c_set_output_enabled(td, false);
 		return 0;
 
 	case DFLL_OPEN_LOOP:
@@ -1171,15 +1352,17 @@ static int attr_registers_show(struct seq_file *s, void *data)
 		seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
 			   dfll_i2c_readl(td, offs));
 
-	seq_puts(s, "\nINTEGRATED I2C CONTROLLER REGISTERS:\n");
-	offs = DFLL_I2C_CLK_DIVISOR;
-	seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
-		   __raw_readl(td->i2c_controller_base + offs));
-
-	seq_puts(s, "\nLUT:\n");
-	for (offs = 0; offs <  4 * MAX_DFLL_VOLTAGES; offs += 4)
+	if (td->pmu_if == TEGRA_DFLL_PMU_I2C) {
+		seq_puts(s, "\nINTEGRATED I2C CONTROLLER REGISTERS:\n");
+		offs = DFLL_I2C_CLK_DIVISOR;
 		seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
-			   __raw_readl(td->lut_base + offs));
+			   __raw_readl(td->i2c_controller_base + offs));
+
+		seq_puts(s, "\nLUT:\n");
+		for (offs = 0; offs <  4 * MAX_DFLL_VOLTAGES; offs += 4)
+			seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
+				   __raw_readl(td->lut_base + offs));
+	}
 
 	return 0;
 }
@@ -1349,15 +1532,21 @@ di_err1:
  */
 static int find_vdd_map_entry_exact(struct tegra_dfll *td, int uV)
 {
-	int i, n_voltages, reg_uV;
+	int i, n_voltages, reg_uV,reg_volt_id, align_step;
+
+	if (WARN_ON(td->pmu_if == TEGRA_DFLL_PMU_PWM))
+		return -EINVAL;
 
+	align_step = uV / td->soc->alignment.step_uv;
 	n_voltages = regulator_count_voltages(td->vdd_reg);
 	for (i = 0; i < n_voltages; i++) {
 		reg_uV = regulator_list_voltage(td->vdd_reg, i);
 		if (reg_uV < 0)
 			break;
 
-		if (uV == reg_uV)
+		reg_volt_id = reg_uV / td->soc->alignment.step_uv;
+
+		if (align_step == reg_volt_id)
 			return i;
 	}
 
@@ -1371,15 +1560,21 @@ static int find_vdd_map_entry_exact(struct tegra_dfll *td, int uV)
  * */
 static int find_vdd_map_entry_min(struct tegra_dfll *td, int uV)
 {
-	int i, n_voltages, reg_uV;
+	int i, n_voltages, reg_uV, reg_volt_id, align_step;
 
+	if (WARN_ON(td->pmu_if == TEGRA_DFLL_PMU_PWM))
+		return -EINVAL;
+
+	align_step = uV / td->soc->alignment.step_uv;
 	n_voltages = regulator_count_voltages(td->vdd_reg);
 	for (i = 0; i < n_voltages; i++) {
 		reg_uV = regulator_list_voltage(td->vdd_reg, i);
 		if (reg_uV < 0)
 			break;
 
-		if (uV <= reg_uV)
+		reg_volt_id = reg_uV / td->soc->alignment.step_uv;
+
+		if (align_step <= reg_volt_id)
 			return i;
 	}
 
@@ -1387,9 +1582,61 @@ static int find_vdd_map_entry_min(struct tegra_dfll *td, int uV)
 	return -EINVAL;
 }
 
+/*
+ * dfll_build_pwm_lut - build the PWM regulator lookup table
+ * @td: DFLL instance
+ * @v_max: Vmax from OPP table
+ *
+ * Look-up table in h/w is ignored when PWM is used as DFLL interface to PMIC.
+ * In this case closed loop output is controlling duty cycle directly. The s/w
+ * look-up that maps PWM duty cycle to voltage is still built by this function.
+ */
+static int dfll_build_pwm_lut(struct tegra_dfll *td, unsigned long v_max)
+{
+	int i;
+	unsigned long rate, reg_volt;
+	u8 lut_bottom = MAX_DFLL_VOLTAGES;
+	int v_min = td->soc->cvb->min_millivolts * 1000;
+
+	for (i = 0; i < MAX_DFLL_VOLTAGES; i++) {
+		reg_volt = td->lut_uv[i];
+
+		/* since opp voltage is exact mv */
+		reg_volt = (reg_volt / 1000) * 1000;
+		if (reg_volt > v_max)
+			break;
+
+		td->lut[i] = i;
+		if ((lut_bottom == MAX_DFLL_VOLTAGES) && (reg_volt >= v_min))
+			lut_bottom = i;
+	}
+
+	/* determine voltage boundaries */
+	td->lut_size = i;
+	if ((lut_bottom == MAX_DFLL_VOLTAGES) ||
+	    (lut_bottom + 1 >= td->lut_size)) {
+		dev_err(td->dev, "no voltage above DFLL minimum %d mV\n",
+			td->soc->cvb->min_millivolts);
+		return -EINVAL;
+	}
+	td->lut_bottom = lut_bottom;
+
+	/* determine rate boundaries */
+	rate = get_dvco_rate_below(td, td->lut_bottom);
+	if (!rate) {
+		dev_err(td->dev, "no opp below DFLL minimum voltage %d mV\n",
+			td->soc->cvb->min_millivolts);
+		return -EINVAL;
+	}
+	td->dvco_rate_min = rate;
+
+	return 0;
+}
+
 /**
  * dfll_build_i2c_lut - build the I2C voltage register lookup table
  * @td: DFLL instance
+ * @v_max: Vmax from OPP table
  *
  * The DFLL hardware has 33 bytes of look-up table RAM that must be filled with
  * PMIC voltage register values that span the entire DFLL operating range.
@@ -1397,33 +1644,24 @@ static int find_vdd_map_entry_min(struct tegra_dfll *td, int uV)
  * the soc-specific platform driver (td->soc->opp_dev) and the PMIC
  * register-to-voltage mapping queried from the regulator framework.
  *
- * On success, fills in td->i2c_lut and returns 0, or -err on failure.
+ * On success, fills in td->lut and returns 0, or -err on failure.
  */
-static int dfll_build_i2c_lut(struct tegra_dfll *td)
+static int dfll_build_i2c_lut(struct tegra_dfll *td, unsigned long v_max)
 {
+	unsigned long rate, v, v_opp;
 	int ret = -EINVAL;
-	int j, v, v_max, v_opp;
-	int selector;
-	unsigned long rate;
-	struct dev_pm_opp *opp;
-	int lut;
-
-	rate = ULONG_MAX;
-	opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
-	if (IS_ERR(opp)) {
-		dev_err(td->dev, "couldn't get vmax opp, empty opp table?\n");
-		goto out;
-	}
-	v_max = dev_pm_opp_get_voltage(opp);
-	dev_pm_opp_put(opp);
+	int j, selector, lut;
 
 	v = td->soc->cvb->min_millivolts * 1000;
 	lut = find_vdd_map_entry_exact(td, v);
 	if (lut < 0)
 		goto out;
-	td->i2c_lut[0] = lut;
+	td->lut[0] = lut;
+	td->lut_bottom = 0;
 
 	for (j = 1, rate = 0; ; rate++) {
+		struct dev_pm_opp *opp;
+
 		opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
 		if (IS_ERR(opp))
 			break;
@@ -1435,39 +1673,64 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
 		dev_pm_opp_put(opp);
 
 		for (;;) {
-			v += max(1, (v_max - v) / (MAX_DFLL_VOLTAGES - j));
+			v += max(1UL, (v_max - v) / (MAX_DFLL_VOLTAGES - j));
 			if (v >= v_opp)
 				break;
 
 			selector = find_vdd_map_entry_min(td, v);
 			if (selector < 0)
 				goto out;
-			if (selector != td->i2c_lut[j - 1])
-				td->i2c_lut[j++] = selector;
+			if (selector != td->lut[j - 1])
+				td->lut[j++] = selector;
 		}
 
 		v = (j == MAX_DFLL_VOLTAGES - 1) ? v_max : v_opp;
 		selector = find_vdd_map_entry_exact(td, v);
 		if (selector < 0)
 			goto out;
-		if (selector != td->i2c_lut[j - 1])
-			td->i2c_lut[j++] = selector;
+		if (selector != td->lut[j - 1])
+			td->lut[j++] = selector;
 
 		if (v >= v_max)
 			break;
 	}
-	td->i2c_lut_size = j;
+	td->lut_size = j;
 
 	if (!td->dvco_rate_min)
 		dev_err(td->dev, "no opp above DFLL minimum voltage %d mV\n",
 			td->soc->cvb->min_millivolts);
-	else
+	else {
 		ret = 0;
+		for (j = 0; j < td->lut_size; j++)
+			td->lut_uv[j] =
+				regulator_list_voltage(td->vdd_reg,
+						       td->lut[j]);
+	}
 
 out:
 	return ret;
 }
 
+static int dfll_build_lut(struct tegra_dfll *td)
+{
+	unsigned long rate, v_max;
+	struct dev_pm_opp *opp;
+
+	rate = ULONG_MAX;
+	opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
+	if (IS_ERR(opp)) {
+		dev_err(td->dev, "couldn't get vmax opp, empty opp table?\n");
+		return -EINVAL;
+	}
+	v_max = dev_pm_opp_get_voltage(opp);
+	dev_pm_opp_put(opp);
+
+	if (td->pmu_if == TEGRA_DFLL_PMU_PWM)
+		return dfll_build_pwm_lut(td, v_max);
+	else
+		return dfll_build_i2c_lut(td, v_max);
+}
+
 /**
  * read_dt_param - helper function for reading required parameters from the DT
  * @td: DFLL instance
@@ -1526,11 +1789,56 @@ static int dfll_fetch_i2c_params(struct tegra_dfll *td)
 	}
 	td->i2c_reg = vsel_reg;
 
-	ret = dfll_build_i2c_lut(td);
-	if (ret) {
-		dev_err(td->dev, "couldn't build I2C LUT\n");
+	return 0;
+}
+
+static int dfll_fetch_pwm_params(struct tegra_dfll *td)
+{
+	int ret, i;
+	u32 pwm_period;
+
+	if (!td->soc->alignment.step_uv || !td->soc->alignment.offset_uv) {
+		dev_err(td->dev,
+			"Missing step or alignment info for PWM regulator");
+		return -EINVAL;
+	}
+	for (i = 0; i < MAX_DFLL_VOLTAGES; i++)
+		td->lut_uv[i] = td->soc->alignment.offset_uv +
+				i * td->soc->alignment.step_uv;
+
+	ret = read_dt_param(td, "nvidia,pwm-tristate-microvolts",
+			    &td->reg_init_uV);
+	if (!ret) {
+		dev_err(td->dev, "couldn't get initialized voltage\n");
+		return ret;
+	}
+
+	ret = read_dt_param(td, "nvidia,pwm-period-nanoseconds", &pwm_period);
+	if (!ret) {
+		dev_err(td->dev, "couldn't get PWM period\n");
 		return ret;
 	}
+	td->pwm_rate = (NSEC_PER_SEC / pwm_period) * (MAX_DFLL_VOLTAGES - 1);
+
+	td->pwm_pin = devm_pinctrl_get(td->dev);
+	if (IS_ERR(td->pwm_pin)) {
+		dev_err(td->dev, "DT: missing pinctrl device\n");
+		return PTR_ERR(td->pwm_pin);
+	}
+
+	td->pwm_enable_state = pinctrl_lookup_state(td->pwm_pin,
+						    "dvfs_pwm_enable");
+	if (IS_ERR(td->pwm_enable_state)) {
+		dev_err(td->dev, "DT: missing pwm enabled state\n");
+		return PTR_ERR(td->pwm_enable_state);
+	}
+
+	td->pwm_disable_state = pinctrl_lookup_state(td->pwm_pin,
+						     "dvfs_pwm_disable");
+	if (IS_ERR(td->pwm_disable_state)) {
+		dev_err(td->dev, "DT: missing pwm disabled state\n");
+		return PTR_ERR(td->pwm_disable_state);
+	}
 
 	return 0;
 }
@@ -1597,16 +1905,6 @@ int tegra_dfll_register(struct platform_device *pdev,
 
 	td->soc = soc;
 
-	td->vdd_reg = devm_regulator_get(td->dev, "vdd-cpu");
-	if (IS_ERR(td->vdd_reg)) {
-		ret = PTR_ERR(td->vdd_reg);
-		if (ret != -EPROBE_DEFER)
-			dev_err(td->dev, "couldn't get vdd_cpu regulator: %d\n",
-				ret);
-
-		return ret;
-	}
-
 	td->dvco_rst = devm_reset_control_get(td->dev, "dvco");
 	if (IS_ERR(td->dvco_rst)) {
 		dev_err(td->dev, "couldn't get dvco reset\n");
@@ -1619,10 +1917,27 @@ int tegra_dfll_register(struct platform_device *pdev,
 		return ret;
 	}
 
-	ret = dfll_fetch_i2c_params(td);
+	if (of_property_read_bool(td->dev->of_node, "nvidia,pwm-to-pmic")) {
+		td->pmu_if = TEGRA_DFLL_PMU_PWM;
+		ret = dfll_fetch_pwm_params(td);
+	} else  {
+		td->vdd_reg = devm_regulator_get(td->dev, "vdd-cpu");
+		if (IS_ERR(td->vdd_reg)) {
+			dev_err(td->dev, "couldn't get vdd_cpu regulator\n");
+			return PTR_ERR(td->vdd_reg);
+		}
+		td->pmu_if = TEGRA_DFLL_PMU_I2C;
+		ret = dfll_fetch_i2c_params(td);
+	}
 	if (ret)
 		return ret;
 
+	ret = dfll_build_lut(td);
+	if (ret) {
+		dev_err(td->dev, "couldn't build LUT\n");
+		return ret;
+	}
+
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(td->dev, "no control register resource\n");