[PATCH 0/2] regulator: Add regulator driver for the MC34708 PMIC

[PATCH 0/2] regulator: Add regulator driver for the MC34708 PMIC

[Martin Fuzzey]

Add regulator driver and associated DT bindings for the regulators in the
Freescale MC34708 PMIC.

[PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Martin Fuzzey]

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
---
 .../bindings/regulator/mc34708-regulator.txt       |  198 ++++++++++++++++++++
 1 file changed, 198 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regulator/mc34708-regulator.txt

diff --git a/Documentation/devicetree/bindings/regulator/mc34708-regulator.txt b/Documentation/devicetree/bindings/regulator/mc34708-regulator.txt
new file mode 100644
index 0000000..35efae0
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/mc34708-regulator.txt
@@ -0,0 +1,198 @@
+Regulators included in the Freescale MC34708 PMIC
+
+Required properties:
+- compatible: "fsl,mc34708"
+- reg: I2C slave address
+
+
+Regulators subnode:
+-------------------
+This node contains children following the standard regulator binding format
+described in Documentation/devicetree/bindings/regulator/regulator.txt
+
+The allowed node names are:
+	Switchers:
+		sw1, sw2, sw3, sw4a, sw4b, sw5, swbst
+	LDOs:
+		vpll, vrefddr, vusb, vusb2, vdac, vgen1, vgen2
+
+The mode values are:
+	Switchers:
+		1 : Pulse Frequency Modulation (PFM) [for low loads]
+		2 : Auto
+		3 : Pulse Width Modulation (PWM) [for high loads]
+	LDOs:
+		1 : Low power
+		2 : Normal
+
+Optional properties:
+The input supply of regulators are the optional properties on the
+regulator node.
+
+- vinsw1-supply : phandle to input supply for sw1 regulator
+- vinsw2-supply : phandle to input supply for sw2 regulator
+- vinsw3-supply : phandle to input supply for sw3 regulator
+- vinsw4a-supply : phandle to input supply for sw4a regulator
+- vinsw4b-supply : phandle to input supply for sw4b regulator
+- vinsw5-supply : phandle to input supply for sw5 regulator
+- vinswbst-supply : phandle to input supply for swbst regulator
+- vinrefddr-supply : phandle to input supply for vrefddr regulator (/2)
+
+
+Example:
+&i2c3 {
+	pmic: mc34708@08 {
+		compatible = "fsl,mc34708";
+		reg = <0x08>;
+		regulators {
+#define PMIC_REGMODE_SW_PFM	1
+#define PMIC_REGMODE_SW_AUTO	2
+#define PMIC_REGMODE_SW_PWM	3
+#define PMIC_REGMODE_LDO_LP	1
+#define PMIC_REGMODE_LDO_NORMAL	2
+
+			vinrefddr-supply = <&pmic_sw4a_reg>;
+			pmic_sw1_reg: sw1 {
+				/* CPU Core */
+				regulator-name = "SW1";
+				regulator-min-microvolt = <650000>;
+				regulator-max-microvolt = <1437500>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_SW_PWM>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <850000>;
+					regulator-mode = <PMIC_REGMODE_SW_PFM>;
+				};
+			};
+
+			pmic_sw2_reg: sw2 {
+				/* SOC Periperals */
+				regulator-name = "SW2";
+				regulator-min-microvolt = <650000>;
+				regulator-max-microvolt = <1437500>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_SW_PWM>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-suspend-microvolt = <950000>;
+					regulator-mode = <PMIC_REGMODE_SW_PFM>;
+				};
+			};
+
+			pmic_sw3_reg: sw3 {
+				regulator-name = "SW3";
+				regulator-min-microvolt = <650000>;
+				regulator-max-microvolt = <1425000>;
+			};
+
+			pmic_sw4a_reg: sw4a {
+				/* DDR Ram */
+				regulator-name = "SW4A";
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_SW_PWM>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-mode = <PMIC_REGMODE_SW_PFM>;
+				};
+			};
+
+			pmic_sw5_reg: sw5 {
+				/* 1v8 power */
+				regulator-name = "SW5";
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <1975000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_SW_PWM>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-mode = <PMIC_REGMODE_SW_PFM>;
+				};
+			};
+
+			pmic_swbst_reg: swbst {
+				regulator-name = "SWBST";
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_SW_AUTO>;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
+			};
+
+			pmic_vpll_reg: vpll {
+				regulator-name = "VPLL";
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			pmic_vrefddr_reg: vrefddr {
+				regulator-name = "VREFDDR";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			pmic_vusb_reg: vusb {
+				regulator-name = "VUSB";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			pmic_vusb2_reg: vusb2 {
+				regulator-name = "VUSB2";
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <3000000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
+			};
+
+			pmic_vdac_reg: vdac {
+				regulator-name = "VDAC";
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <2775000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_LDO_NORMAL>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-mode = <PMIC_REGMODE_LDO_LP>;
+				};
+			};
+
+			pmic_vgen1_reg: vgen1 {
+				regulator-name = "VGEN1";
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <1550000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-state-mem {
+					regulator-off-in-suspend;
+				};
+			};
+
+			pmic_vgen2_reg: vgen2 {
+				regulator-name = "VGEN2";
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-initial-mode = <PMIC_REGMODE_LDO_NORMAL>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+					regulator-mode = <PMIC_REGMODE_LDO_LP>;
+				};
+			};
+		};
+	};
+};

Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Mark Brown]

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On Tue, Apr 28, 2015 at 04:17:38PM +0200, Martin Fuzzey wrote:

> +			pmic_sw3_reg: sw3 {
> +				regulator-name = "SW3";
> +				regulator-min-microvolt = <650000>;
> +				regulator-max-microvolt = <1425000>;
> +			};

These examples look awfully like you're just listiong the maximum range
allowed by the PMIC for all the supplies which is almost never something
someone would want to do on a real board.  Similarly all the names are
just the name of the regulator rather than something that looks like a
board specific name.

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Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Stefan Wahren]

Hi Martin,

> Martin Fuzzey <mfuzzey@parkeon.com> hat am 28. April 2015 um 16:17
> geschrieben:
>
>
> Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>

a commit message would be nice and the subject should specify dt-bindings
instead of regulator subsystem.

Stefan

Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Mark Brown]

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On Fri, May 01, 2015 at 12:34:21PM +0200, Stefan Wahren wrote:

> a commit message would be nice and the subject should specify dt-bindings
> instead of regulator subsystem.

No, it shouldn't.  DT bindings for a subsystem go through the subsystem
and the subsystem maintainer needs to see them to read them.

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Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Stefan Wahren]

Hi Mark,

> Mark Brown <broonie@kernel.org> hat am 1. Mai 2015 um 13:01 geschrieben:
>
>
> On Fri, May 01, 2015 at 12:34:21PM +0200, Stefan Wahren wrote:
>
> > a commit message would be nice and the subject should specify dt-bindings
> > instead of regulator subsystem.
>
> No, it shouldn't. DT bindings for a subsystem go through the subsystem
> and the subsystem maintainer needs to see them to read them.

sorry for my bad expressing. 

I tought the subject line should be something like:

DT: add binding documentation for mc34708 regulator

Stefan

Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Mark Brown]

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On Fri, May 01, 2015 at 02:33:44PM +0200, Stefan Wahren wrote:
> > Mark Brown <broonie@kernel.org> hat am 1. Mai 2015 um 13:01 geschrieben:

> > On Fri, May 01, 2015 at 12:34:21PM +0200, Stefan Wahren wrote:

> > > a commit message would be nice and the subject should specify dt-bindings
> > > instead of regulator subsystem.

> > No, it shouldn't. DT bindings for a subsystem go through the subsystem
> > and the subsystem maintainer needs to see them to read them.

> sorry for my bad expressing. 

> I tought the subject line should be something like:

> DT: add binding documentation for mc34708 regulator

No, it shouldn't.  The subject line should start "regulator: " like all
other regulator commits.

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Re: [PATCH 1/2] Regulator: mc34708: Add DT binding documentation

[Javier Martinez Canillas]

Hello Martin,

I haven't looked at your regulator driver in detail so this is not a
full review but I just noticed something so I wanted mention.

> +
> +
> +Example:
> +&i2c3 {
> +       pmic: mc34708@08 {
> +               compatible = "fsl,mc34708";
> +               reg = <0x08>;
> +               regulators {
> +#define PMIC_REGMODE_SW_PFM    1
> +#define PMIC_REGMODE_SW_AUTO   2
> +#define PMIC_REGMODE_SW_PWM    3
> +#define PMIC_REGMODE_LDO_LP    1
> +#define PMIC_REGMODE_LDO_NORMAL        2
> +

I see that you are defining these constants in your driver too (albeit
with slightly different names). These kind of constants that are
shared between the driver implementation and the Device Tree source
files should be added to include/dt-bindings/regulator/ and included
in both the driver and the DTS.

Best regards,
Javier

[PATCH 2/2] Regulator: add driver for Freescale MC34708

[Martin Fuzzey]

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
---
 drivers/regulator/Kconfig             |    7 
 drivers/regulator/Makefile            |    1 
 drivers/regulator/mc34708-regulator.c | 1266 +++++++++++++++++++++++++++++++++
 3 files changed, 1274 insertions(+)
 create mode 100644 drivers/regulator/mc34708-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 31ac1bf..0d03c39 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -440,6 +440,13 @@ config REGULATOR_MC13892
 	  Say y here to support the regulators found on the Freescale MC13892
 	  PMIC.
 
+config REGULATOR_MC34708
+	tristate "Freescale MC34708 regulator driver"
+	depends on MFD_MC13XXX
+	help
+	  Say y here to support the regulators found on the Freescale MC34708
+	  and MC34709 PMICs.
+
 config REGULATOR_PALMAS
 	tristate "TI Palmas PMIC Regulators"
 	depends on MFD_PALMAS
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index c1b4fba..6382f6c 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_MC34708) += mc34708-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
diff --git a/drivers/regulator/mc34708-regulator.c b/drivers/regulator/mc34708-regulator.c
new file mode 100644
index 0000000..b5ff727
--- /dev/null
+++ b/drivers/regulator/mc34708-regulator.c
@@ -0,0 +1,1266 @@
+/*
+ * Driver for regulators in the Fresscale MC34708/9 PMICs
+ *
+ * The hardware uses different schemes for the three types of regulators:
+ *
+ * The SWx regulators:
+ *	A single register field multiplexes enable/disable and mode
+ *	selection, for both normal and standby state.
+ *	Independent voltage control in normal and standby states.
+ *
+ * The SWBST regulator:
+ *	One register field for combined enable/disable and mode selection
+ *	in normal state and a second field for standby state.
+ *	Single voltage control for both normal and standby states.
+ *
+ * The LDO regulators:
+ *	Enable bit (not multiplexed with mode)
+ *	Single voltage control for both normal and standby states.
+ *	Standby and Mode bits shared by standby and normal states
+ *
+ * The mc13xxx-regulator-core is not a good fit for the above so it is
+ * not used.
+ *
+ * Copyright 2015 Parkeon
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/mfd/mc13xxx.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+struct mc34708_hw_mode {
+	s8	normal;
+	s8	alt_normal;
+	s8	standby;
+};
+
+struct mc34708_regulator;
+
+/* Common to regulators of the same type */
+struct mc34708_regulator_kind {
+	int (*setup)(struct mc34708_regulator *);
+	unsigned int (*of_map_mode)(unsigned int);
+	const struct mc34708_hw_mode *hw_modes;
+	int num_hw_modes;
+	const struct regulator_ops ops;
+};
+
+/* Specific for each regulator */
+struct mc34708_regulator_def {
+	const char *name;
+	const struct mc34708_regulator_kind *kind;
+	const char *supply_name;
+	unsigned int enable_reg;
+	unsigned int enable_mask;
+	unsigned int n_voltages;
+	unsigned int fixed_uV;
+	unsigned int min_uV;
+	unsigned int uV_step;
+	const unsigned int *volt_table;
+	unsigned int vsel_reg;
+	unsigned int vsel_mask;
+	unsigned int vsel_stdby_mask;
+	unsigned int mode_reg;
+	unsigned int mode_mask;
+	unsigned int mode_stdby_mask;
+};
+
+struct mc34708_regulator {
+	struct device *dev;
+	struct mc13xxx  *mc13xxx;
+	const struct mc34708_regulator_def *def;
+	struct regulator_desc desc;
+	struct regulator_config config;
+	unsigned int req_mode_normal;
+	unsigned int req_mode_standby;
+	bool suspend_off;
+};
+
+struct mc34708_drv_data {
+	u32 saved_regmode0;
+	struct	mc34708_regulator regulators[0];
+};
+
+/* ********************************************************************** */
+/* Common helpers */
+/* ********************************************************************** */
+
+static int mc34708_read_bits(struct mc34708_regulator *mc34708_reg,
+			     unsigned int reg, u32 mask)
+{
+	int ret;
+	u32 val;
+
+	ret = mc13xxx_reg_read(mc34708_reg->mc13xxx, reg, &val);
+	if (ret < 0)
+		return ret;
+
+	val &= mask;
+	val >>= ffs(mask) - 1;
+
+	return val;
+}
+
+static int mc34708_update_bits(struct mc34708_regulator *mc34708_reg,
+			       unsigned int reg, u32 mask, u32 val)
+{
+	val <<= ffs(mask) - 1;
+
+	return mc13xxx_reg_rmw(mc34708_reg->mc13xxx, reg, mask, val);
+}
+
+static int mc34708_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_read_bits(mc34708_reg,
+				rdev->desc->vsel_reg, rdev->desc->vsel_mask);
+}
+
+static int mc34708_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					rdev->desc->vsel_reg,
+					rdev->desc->vsel_mask,
+					sel);
+}
+
+static int mc34708_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int sel;
+
+	sel = regulator_map_voltage_linear(rdev, uV, uV);
+	if (sel < 0)
+		return sel;
+
+	return mc34708_update_bits(mc34708_reg,
+					rdev->desc->vsel_reg,
+					mc34708_reg->def->vsel_stdby_mask,
+					sel);
+}
+
+static const struct mc34708_hw_mode *mc34708_get_hw_mode(
+	struct mc34708_regulator *mc34708_reg)
+{
+	int val;
+	const struct mc34708_hw_mode *hwmode;
+
+	val = mc34708_read_bits(mc34708_reg,
+				mc34708_reg->def->mode_reg,
+				mc34708_reg->def->mode_mask);
+	if (val < 0)
+		return ERR_PTR(val);
+
+	BUG_ON(val >= mc34708_reg->def->kind->num_hw_modes);
+	hwmode = &mc34708_reg->def->kind->hw_modes[val];
+
+	dev_dbg(mc34708_reg->dev, "%s: HwMode=0x%x => normal=%d standby=%d\n",
+		mc34708_reg->def->name, val,
+		hwmode->normal, hwmode->standby);
+
+	return hwmode;
+}
+
+static int mc34708_sw_find_hw_mode_sel(
+	const struct mc34708_regulator_kind *kind,
+	unsigned int normal,
+	unsigned int standby)
+{
+	const struct mc34708_hw_mode *mode;
+	int i;
+
+	for (i = 0, mode = kind->hw_modes;
+			i < kind->num_hw_modes; i++, mode++) {
+		if (mode->normal == -1 || mode->standby == -1)
+			continue;
+
+		if (mode->standby != standby)
+			continue;
+
+		if ((mode->normal == normal) ||
+		    (normal && (mode->alt_normal == normal)))
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int mc34708_update_hw_mode(
+	struct mc34708_regulator *mc34708_reg,
+	unsigned int normal,
+	unsigned int standby)
+{
+	int sel;
+
+	sel = mc34708_sw_find_hw_mode_sel(mc34708_reg->def->kind,
+					  normal, standby);
+	if (sel < 0) {
+		dev_err(mc34708_reg->dev,
+			"%s: no hardware mode for normal=%d standby=%d\n",
+			mc34708_reg->def->name,
+			normal,
+			standby);
+
+		return sel;
+	}
+
+	dev_dbg(mc34708_reg->dev, "%s: normal=%d standby=%d => HwMODE=0x%x\n",
+		mc34708_reg->def->name,
+		normal,
+		standby,
+		sel);
+
+	return mc34708_update_bits(mc34708_reg,
+					mc34708_reg->def->mode_reg,
+					mc34708_reg->def->mode_mask,
+					sel);
+}
+
+/* ********************************************************************** */
+/* SWx regulator support */
+/* ********************************************************************** */
+
+/*
+ * Mapping of SWxMODE bits to mode in normal and standby state.
+ * The hardware has the follwoing modes (in order of increasing power):
+ *	OFF
+ *	PFM (Pulse Frequency Modulation) for low loads
+ *	APS (Automatic Pulse Skip)
+ *	PWM (Pulse Width Modulation) for high loads
+ *
+ * Not all combinations are possible. The mode in normal state cannot
+ * be lower power than that in standby state.
+ *
+ * We map these to Linux regulator modes as follows:
+ *	PFM : REGULATOR_MODE_STANDBY
+ *	PWM : REGULATOR_MODE_FAST
+ *	APS : REGULATOR_MODE_NORMAL
+ *	OFF : 0
+ *	Reserved : -1
+ */
+static const struct mc34708_hw_mode mc34708_sw_modes[] = {
+	{ .normal = 0,			    .standby = 0 },
+	{ .normal = REGULATOR_MODE_FAST,    .standby = 0 },
+	{ .normal = -1,			    .standby = -1 },
+	{ .normal = REGULATOR_MODE_STANDBY, .standby = 0 },
+	{ .normal = REGULATOR_MODE_NORMAL,  .standby = 0 },
+	{ .normal = REGULATOR_MODE_FAST,    .standby = REGULATOR_MODE_FAST },
+	{ .normal = REGULATOR_MODE_FAST,    .standby = REGULATOR_MODE_NORMAL },
+	{ .normal = 0,			    .standby = 0 },
+	{ .normal = REGULATOR_MODE_NORMAL,  .standby = REGULATOR_MODE_NORMAL },
+	{ .normal = -1,			    .standby = -1 },
+	{ .normal = -1,			    .standby = -1 },
+	{ .normal = -1,			    .standby = -1 },
+	{ .normal = REGULATOR_MODE_NORMAL,  .standby = REGULATOR_MODE_STANDBY },
+	{ .normal = REGULATOR_MODE_FAST,    .standby = REGULATOR_MODE_STANDBY },
+	{ .normal = -1,			    .standby = -1 },
+	{ .normal = REGULATOR_MODE_STANDBY, .standby = REGULATOR_MODE_STANDBY },
+};
+
+#define MC34708_SW_OPMODE_PFM	1
+#define MC34708_SW_OPMODE_APS	2
+#define MC34708_SW_OPMODE_PWM	3
+
+static unsigned int mc34708_sw_of_map_mode(unsigned int mode)
+{
+	switch (mode) {
+	case MC34708_SW_OPMODE_PFM:
+		return REGULATOR_MODE_STANDBY;
+	case MC34708_SW_OPMODE_APS:
+		return REGULATOR_MODE_NORMAL;
+	case MC34708_SW_OPMODE_PWM:
+		return REGULATOR_MODE_FAST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mc34708_sw_setup(struct mc34708_regulator *mc34708_reg)
+{
+	const struct mc34708_hw_mode *hw_mode;
+
+	hw_mode = mc34708_get_hw_mode(mc34708_reg);
+	if (IS_ERR(hw_mode))
+		return PTR_ERR(hw_mode);
+
+	/*
+	 * Be safe and bail out without touching hardware if
+	 * the initial state is "reserved"
+	 */
+	if (hw_mode->normal < 0) {
+		dev_err(mc34708_reg->dev,
+			"%s in reserved mode for normal\n",
+			mc34708_reg->def->name);
+		return -EINVAL;
+	}
+	if (hw_mode->standby < 0) {
+		dev_err(mc34708_reg->dev,
+			"%s in reserved mode for standby\n",
+			mc34708_reg->def->name);
+		return -EINVAL;
+	}
+
+	if (hw_mode->normal > 0)
+		mc34708_reg->req_mode_normal = hw_mode->normal;
+	else
+		/*
+		 * If regulator is intially off we don't know the mode
+		 * but we need a mode to be able to enable it later.
+		 */
+		mc34708_reg->req_mode_normal = REGULATOR_MODE_NORMAL;
+
+	mc34708_reg->req_mode_standby = hw_mode->standby;
+	if (!hw_mode->standby)
+		mc34708_reg->suspend_off = true;
+
+	return 0;
+}
+
+static int mc34708_sw_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_hw_mode(mc34708_reg,
+						mc34708_reg->req_mode_normal,
+						mc34708_reg->req_mode_standby);
+}
+
+static int mc34708_sw_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_hw_mode(mc34708_reg,
+						0,
+						mc34708_reg->req_mode_standby);
+}
+
+static int mc34708_sw_is_enabled(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	const struct mc34708_hw_mode *hw_mode;
+
+	hw_mode = mc34708_get_hw_mode(mc34708_reg);
+	if (IS_ERR(hw_mode))
+		return PTR_ERR(hw_mode);
+
+	return hw_mode->normal > 0;
+}
+
+static unsigned int mc34708_sw_get_mode(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_reg->req_mode_normal;
+}
+
+static int mc34708_sw_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int enabled, ret;
+
+	enabled = mc34708_sw_is_enabled(rdev);
+	if (enabled < 0)
+		return enabled;
+
+	if (enabled) {
+		ret = mc34708_update_hw_mode(mc34708_reg,
+					     mode,
+					     mc34708_reg->req_mode_standby);
+		if (ret)
+			return ret;
+	}
+
+	mc34708_reg->req_mode_normal = mode;
+
+	return 0;
+}
+
+static int mc34708_sw_set_suspend_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mc34708_reg->req_mode_normal,
+				     mc34708_reg->req_mode_standby);
+	if (!ret)
+		mc34708_reg->suspend_off = false;
+
+	return ret;
+}
+
+static int mc34708_sw_set_suspend_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mc34708_reg->req_mode_normal,
+				     0);
+	if (!ret)
+		mc34708_reg->suspend_off = true;
+
+	return ret;
+}
+
+static int mc34708_sw_set_suspend_mode(struct regulator_dev *rdev,
+				       unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int enabled, ret;
+
+	enabled = mc34708_sw_is_enabled(rdev);
+	if (enabled < 0)
+		return enabled;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     enabled ? mc34708_reg->req_mode_normal : 0,
+				     mc34708_reg->suspend_off ? 0 : mode);
+	if (!ret)
+		mc34708_reg->req_mode_standby = mode;
+
+	return ret;
+}
+
+/* ********************************************************************** */
+/* SWBST regulator support */
+/* ********************************************************************** */
+
+static int mc34708_swbst_mode_to_hwmode(unsigned int mode)
+{
+	switch (mode) {
+	case REGULATOR_MODE_IDLE:
+	case REGULATOR_MODE_STANDBY:
+		return  MC34708_SW_OPMODE_PFM;
+
+	case REGULATOR_MODE_NORMAL:
+		return MC34708_SW_OPMODE_APS;
+
+	case REGULATOR_MODE_FAST:
+		return MC34708_SW_OPMODE_PWM;
+
+	default:
+		return -EINVAL;
+	};
+}
+
+static int mc34708_swbst_hwmode_to_mode(unsigned int hwmode)
+{
+	return mc34708_sw_of_map_mode(hwmode);
+}
+
+static int mc34708_swbst_setup(struct mc34708_regulator *mc34708_reg)
+{
+	int val, mode;
+
+	val = mc34708_read_bits(mc34708_reg,
+				mc34708_reg->def->mode_reg,
+				mc34708_reg->def->mode_mask);
+	if (val < 0)
+		return val;
+
+	if (val > 0) {
+		mode = mc34708_swbst_hwmode_to_mode(val);
+		if (mode < 0)
+			return mode;
+
+		mc34708_reg->req_mode_normal = mode;
+	} else {
+		/*
+		 * If regulator is intially off we don't know the mode
+		 * but we need a mode to be able to enable it later.
+		 */
+		mc34708_reg->req_mode_normal = REGULATOR_MODE_NORMAL;
+	}
+
+	dev_dbg(mc34708_reg->dev,
+		"%s: Initial normal mode hw=%d linux=%d\n",
+		mc34708_reg->def->name, val, mc34708_reg->req_mode_normal);
+
+	val = mc34708_read_bits(mc34708_reg,
+				mc34708_reg->def->mode_reg,
+				mc34708_reg->def->mode_stdby_mask);
+	if (val < 0)
+		return val;
+
+	if (val > 0) {
+		mode = mc34708_swbst_hwmode_to_mode(val);
+		if (mode < 0)
+			return mode;
+
+		mc34708_reg->req_mode_standby = mode;
+	} else {
+		/*
+		 * If regulator is intially off we don't know the mode
+		 * but we need a mode to be able to enable it later.
+		 */
+		mc34708_reg->req_mode_standby = REGULATOR_MODE_STANDBY;
+	}
+
+	dev_dbg(mc34708_reg->dev, "Initial standby mode hw=%d linux=%d\n",
+		val,
+		mc34708_reg->req_mode_standby);
+
+	return 0;
+}
+
+static int mc34708_swbst_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					mc34708_reg->def->mode_reg,
+					mc34708_reg->def->mode_mask,
+					mc34708_reg->req_mode_normal);
+}
+
+static int mc34708_swbst_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					mc34708_reg->def->mode_reg,
+					mc34708_reg->def->mode_mask,
+					0);
+}
+
+static int mc34708_swbst_is_enabled(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int val;
+
+	val = mc34708_read_bits(mc34708_reg,
+				mc34708_reg->def->mode_reg,
+				mc34708_reg->def->mode_mask);
+
+	if (val < 0)
+		return val;
+
+	return val == 0 ? 0 : 1;
+}
+
+static unsigned int mc34708_swbst_get_mode(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_reg->req_mode_normal;
+}
+
+static int mc34708_swbst_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int enabled, hwmode, ret;
+
+	hwmode = mc34708_swbst_mode_to_hwmode(mode);
+	if (hwmode < 0)
+		return hwmode;
+
+	enabled = mc34708_swbst_is_enabled(rdev);
+	if (enabled < 0)
+		return enabled;
+
+	if (enabled) {
+		ret = mc34708_update_bits(mc34708_reg,
+					  mc34708_reg->def->mode_reg,
+					  mc34708_reg->def->mode_mask,
+					  hwmode);
+		if (ret)
+			return ret;
+	}
+
+	mc34708_reg->req_mode_normal = mode;
+
+	return 0;
+}
+
+static int mc34708_swbst_set_suspend_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int hwmode;
+
+	hwmode = mc34708_swbst_mode_to_hwmode(mc34708_reg->req_mode_standby);
+	if (hwmode < 0)
+		return hwmode;
+
+	return mc34708_update_bits(mc34708_reg,
+					mc34708_reg->def->mode_reg,
+					mc34708_reg->def->mode_stdby_mask,
+					hwmode);
+}
+
+static int mc34708_swbst_set_suspend_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					mc34708_reg->def->mode_reg,
+					mc34708_reg->def->mode_stdby_mask,
+					0);
+}
+
+static int mc34708_swbst_set_suspend_mode(struct regulator_dev *rdev,
+					  unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret, hwmode;
+
+	hwmode = mc34708_swbst_mode_to_hwmode(mode);
+	if (hwmode < 0)
+		return hwmode;
+
+	ret = mc34708_update_bits(mc34708_reg,
+				  mc34708_reg->def->mode_reg,
+				  mc34708_reg->def->mode_stdby_mask,
+				  hwmode);
+	if (!ret)
+		mc34708_reg->req_mode_standby = mode;
+
+	return ret;
+}
+
+/* ********************************************************************** */
+/* LDO regulator support */
+/* ********************************************************************** */
+
+/*
+ * 3 types mode / standby configuration for LDOs:
+ *	No mode configuration
+ *	Single bit mode cofiguration (standby bit)
+ *	2 bit mode configuration mode, standby
+ *
+ * LDO states (excluding enable bit)
+ *	VxMODE	VxSTBY		Normal	Standby
+ *	0	0		ON	ON
+ *	0	1		ON	OFF
+ *	1	0		LP	LP
+ *	1	1		ON	LP
+ *
+ * Note that it is not possible to have Normal=LP, Standby=OFF
+ * If this state is requested we will use Normal=ON, Standby=OFF until exit
+ * from suspend.
+ * Hence the .alt_normal below which is used for extra matching
+ */
+static const struct mc34708_hw_mode mc34708_ldo_modes[] = {
+	{
+		.normal = REGULATOR_MODE_NORMAL,
+		.standby = REGULATOR_MODE_NORMAL
+	},
+	{
+		.normal = REGULATOR_MODE_NORMAL,
+		.alt_normal =  REGULATOR_MODE_STANDBY,
+		.standby = 0
+	},
+	{
+		.normal = REGULATOR_MODE_STANDBY,
+		.standby = REGULATOR_MODE_STANDBY
+	},
+	{
+		.normal = REGULATOR_MODE_NORMAL,
+		.standby = REGULATOR_MODE_STANDBY
+	},
+};
+
+#define MC34708_LDO_OPMODE_LOWPOWER	1
+#define MC34708_LDO_OPMODE_NORMAL	2
+
+static unsigned int mc34708_ldo_of_map_mode(unsigned int mode)
+{
+	switch (mode) {
+	case MC34708_LDO_OPMODE_NORMAL:
+		return REGULATOR_MODE_NORMAL;
+	case MC34708_LDO_OPMODE_LOWPOWER:
+		return REGULATOR_MODE_STANDBY;
+	default:
+		return -EINVAL;
+	}
+}
+
+static bool mc34708_ldo_has_mode_bit(struct mc34708_regulator *mc34708_reg)
+{
+	unsigned int mask = mc34708_reg->def->mode_mask;
+
+	if (!mask)
+		return false;
+
+	mask >>= ffs(mask) - 1;
+
+	return mask == 3;
+}
+
+static int mc34708_ldo_setup(struct mc34708_regulator *mc34708_reg)
+{
+	const struct mc34708_hw_mode *hw_mode;
+
+	hw_mode = mc34708_get_hw_mode(mc34708_reg);
+	if (IS_ERR(hw_mode))
+		return PTR_ERR(hw_mode);
+
+	mc34708_reg->req_mode_normal = hw_mode->normal;
+	if (hw_mode->standby) {
+		mc34708_reg->suspend_off = false;
+		mc34708_reg->req_mode_standby = hw_mode->standby;
+	} else {
+		/* If configured for off in standby we still need a mode to
+		 * use when .set_suspend_enable() is called.
+		 * That mode depends if the regulator has a mode bit.
+		 */
+		mc34708_reg->suspend_off = true;
+		if (mc34708_ldo_has_mode_bit(mc34708_reg))
+			mc34708_reg->req_mode_standby = REGULATOR_MODE_STANDBY;
+		else
+			mc34708_reg->req_mode_standby = REGULATOR_MODE_NORMAL;
+	}
+
+	return 0;
+}
+
+static int mc34708_ldo_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					rdev->desc->enable_reg,
+					rdev->desc->enable_mask,
+					1);
+}
+
+static int mc34708_ldo_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_update_bits(mc34708_reg,
+					rdev->desc->enable_reg,
+					rdev->desc->enable_mask,
+					0);
+}
+
+static int mc34708_ldo_is_enabled(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_read_bits(mc34708_reg,
+					rdev->desc->enable_reg,
+					rdev->desc->enable_mask);
+}
+
+static int mc34708_ldo_vhalf_get_voltage(struct regulator_dev *rdev)
+{
+	int ret;
+
+	if (!rdev->supply)
+		return -EINVAL;
+
+	ret = regulator_get_voltage(rdev->supply);
+	if (ret > 0)
+		ret /= 2;
+
+	return ret;
+}
+
+static unsigned int mc34708_ldo_get_mode(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+
+	return mc34708_reg->req_mode_normal;
+}
+
+static int mc34708_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	if (!mc34708_ldo_has_mode_bit(mc34708_reg))
+		return 0;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mode,
+				     mc34708_reg->req_mode_standby);
+	if (!ret)
+		mc34708_reg->req_mode_normal = mode;
+
+	return ret;
+}
+
+static int mc34708_ldo_set_suspend_enable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mc34708_reg->req_mode_normal,
+				     mc34708_reg->req_mode_standby);
+	if (!ret)
+		mc34708_reg->suspend_off = false;
+
+	return ret;
+}
+
+static int mc34708_ldo_set_suspend_disable(struct regulator_dev *rdev)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mc34708_reg->req_mode_normal,
+				     0);
+	if (!ret)
+		mc34708_reg->suspend_off = true;
+
+	return ret;
+}
+
+static int mc34708_ldo_set_suspend_mode(struct regulator_dev *rdev,
+					unsigned int mode)
+{
+	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
+	int ret;
+
+	if (!mc34708_ldo_has_mode_bit(mc34708_reg))
+		return 0;
+
+	ret = mc34708_update_hw_mode(mc34708_reg,
+				     mc34708_reg->req_mode_normal,
+				     mc34708_reg->suspend_off ? 0 : mode);
+	if (!ret)
+		mc34708_reg->req_mode_standby = mode;
+
+	return ret;
+}
+
+static const struct mc34708_regulator_kind mc34708_sw_kind = {
+	.setup		= mc34708_sw_setup,
+	.hw_modes	= mc34708_sw_modes,
+	.num_hw_modes	= ARRAY_SIZE(mc34708_sw_modes),
+	.of_map_mode	= mc34708_sw_of_map_mode,
+	.ops = {
+		.enable			= mc34708_sw_enable,
+		.disable		= mc34708_sw_disable,
+		.is_enabled		= mc34708_sw_is_enabled,
+
+		.list_voltage		= regulator_list_voltage_linear,
+		.get_voltage_sel	= mc34708_get_voltage_sel,
+		.set_voltage_sel	= mc34708_set_voltage_sel,
+
+		.get_mode		= mc34708_sw_get_mode,
+		.set_mode		= mc34708_sw_set_mode,
+
+		.set_suspend_voltage	= mc34708_set_suspend_voltage,
+		.set_suspend_enable	= mc34708_sw_set_suspend_enable,
+		.set_suspend_disable	= mc34708_sw_set_suspend_disable,
+		.set_suspend_mode	= mc34708_sw_set_suspend_mode,
+	},
+};
+
+static const struct mc34708_regulator_kind mc34708_swbst_kind = {
+	.setup		= mc34708_swbst_setup,
+	.of_map_mode	= mc34708_sw_of_map_mode,
+	.ops = {
+		.enable			= mc34708_swbst_enable,
+		.disable		= mc34708_swbst_disable,
+		.is_enabled		= mc34708_swbst_is_enabled,
+
+		.list_voltage		= regulator_list_voltage_linear,
+		.get_voltage_sel	= mc34708_get_voltage_sel,
+		.set_voltage_sel	= mc34708_set_voltage_sel,
+
+		.get_mode		= mc34708_swbst_get_mode,
+		.set_mode		= mc34708_swbst_set_mode,
+
+		.set_suspend_enable	= mc34708_swbst_set_suspend_enable,
+		.set_suspend_disable	= mc34708_swbst_set_suspend_disable,
+		.set_suspend_mode	= mc34708_swbst_set_suspend_mode,
+	},
+};
+
+static const struct mc34708_regulator_kind mc34708_ldo_kind = {
+	.setup		= mc34708_ldo_setup,
+	.hw_modes	= mc34708_ldo_modes,
+	.num_hw_modes	= ARRAY_SIZE(mc34708_ldo_modes),
+	.of_map_mode	= mc34708_ldo_of_map_mode,
+	.ops = {
+		.enable			= mc34708_ldo_enable,
+		.disable		= mc34708_ldo_disable,
+		.is_enabled		= mc34708_ldo_is_enabled,
+
+		.list_voltage		= regulator_list_voltage_table,
+		.get_voltage_sel	= mc34708_get_voltage_sel,
+		.set_voltage_sel	= mc34708_set_voltage_sel,
+
+		.get_mode		= mc34708_ldo_get_mode,
+		.set_mode		= mc34708_ldo_set_mode,
+
+		.set_suspend_enable	= mc34708_ldo_set_suspend_enable,
+		.set_suspend_disable	= mc34708_ldo_set_suspend_disable,
+		.set_suspend_mode	= mc34708_ldo_set_suspend_mode,
+	},
+};
+
+static const struct mc34708_regulator_kind mc34708_ldo_fixed_kind = {
+	.ops = {
+		.enable			= mc34708_ldo_enable,
+		.disable		= mc34708_ldo_disable,
+		.is_enabled		= mc34708_ldo_is_enabled,
+	},
+};
+
+static const struct mc34708_regulator_kind mc34708_ldo_vhalf_kind = {
+	.ops = {
+		.enable			= mc34708_ldo_enable,
+		.disable		= mc34708_ldo_disable,
+		.is_enabled		= mc34708_ldo_is_enabled,
+		.get_voltage		= mc34708_ldo_vhalf_get_voltage,
+	},
+};
+
+static const unsigned int mc34708_pll_volt_table[] = {
+	1200000, 1250000, 1500000, 1800000
+};
+
+static const unsigned int mc34708_vusb2_volt_table[] = {
+	2500000, 2600000, 2750000, 3000000
+};
+
+static const unsigned int mc34708_vdac_volt_table[] = {
+	2500000, 2600000, 270000, 2775000
+};
+
+static const unsigned int mc34708_vgen1_volt_table[] = {
+	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000
+};
+
+static const unsigned int mc34708_vgen2_volt_table[] = {
+	2500000, 2700000, 2800000, 2900000, 3000000, 3100000, 3150000, 3300000
+};
+
+static struct mc34708_regulator_def mc34708_regulator_defs[] = {
+	/* Buck regulators */
+	{
+		.name			= "sw1",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw1",
+		.min_uV			= 650000,
+		.uV_step		= 12500,
+		.n_voltages		= 64,
+		.vsel_reg		= 0x18,
+		.vsel_mask		= (0x3f << 0),
+		.vsel_stdby_mask	= (0x3f << 6),
+		.mode_reg		= 0x1c,
+		.mode_mask		= (0xf << 0),
+	},
+	{
+		.name			= "sw2",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw2",
+		.min_uV			= 650000,
+		.uV_step		= 12500,
+		.n_voltages		= 64,
+		.vsel_reg		= 0x19,
+		.vsel_mask		= (0x3f << 0),
+		.vsel_stdby_mask	= (0x3f << 6),
+		.mode_reg		= 0x1c,
+		.mode_mask		= (0xf << 14),
+	},
+	{
+		.name			= "sw3",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw3",
+		.min_uV			= 650000,
+		.uV_step		= 25000,
+		.n_voltages		= 32,
+		.vsel_reg		= 0x19,
+		.vsel_mask		= (0x1f << 12),
+		.vsel_stdby_mask	= (0x1f << 18),
+		.mode_reg		= 0x1d,
+		.mode_mask		= (0xf << 0),
+	},
+	{
+		.name			= "sw4a",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw4a",
+		.min_uV			= 1200000,
+		.uV_step		= 25000,
+		.n_voltages		= 27,
+		.vsel_reg		= 0x1a,
+		.vsel_mask		= (0x1f << 0),
+		.vsel_stdby_mask	= (0x1f << 5),
+		.mode_reg		= 0x1d,
+		.mode_mask		= (0xf << 6),
+	},
+	{
+		.name			= "sw4b",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw4b",
+		.min_uV			= 1200000,
+		.uV_step		= 25000,
+		.n_voltages		= 27,
+		.vsel_reg		= 0x1a,
+		.vsel_mask		= (0x1f << 12),
+		.vsel_stdby_mask	= (0x1f << 17),
+		.mode_reg		= 0x1d,
+		.mode_mask		= (0xf << 12),
+	},
+	{
+		.name			= "sw5",
+		.kind			= &mc34708_sw_kind,
+		.supply_name		= "vinsw5",
+		.min_uV			= 1200000,
+		.uV_step		= 25000,
+		.n_voltages		= 27,
+		.vsel_reg		= 0x1b,
+		.vsel_mask		= (0x1f << 0),
+		.vsel_stdby_mask	= (0x1f << 10),
+		.mode_reg		= 0x1d,
+		.mode_mask		= (0xf << 18),
+	},
+
+	/* SWBST regulator */
+	{
+		.name			= "swbst",
+		.kind			= &mc34708_swbst_kind,
+		.supply_name		= "vinswbst",
+		.min_uV			= 5000000,
+		.uV_step		= 50000,
+		.n_voltages		= 4,
+		.vsel_reg		= 0x1f,
+		.vsel_mask		= (0x3 << 0),
+		.mode_reg		= 0x1f,
+		.mode_mask		= (0x3 << 2),
+		.mode_stdby_mask	= (0x3 << 5),
+	},
+
+	/* LDO regulators */
+	{
+		.name			= "vpll",
+		.kind			= &mc34708_ldo_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 15),
+		.volt_table		= mc34708_pll_volt_table,
+		.n_voltages		= ARRAY_SIZE(mc34708_pll_volt_table),
+		.mode_reg		= 0x20,
+		.mode_mask		= (1 << 16),
+	},
+	{
+		.name			= "vrefddr",
+		.kind			= &mc34708_ldo_vhalf_kind,
+		.supply_name		= "vinrefddr",
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 10),
+	},
+	{
+		.name			= "vusb",
+		.kind			= &mc34708_ldo_fixed_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 3),
+		.fixed_uV		= 3300000,
+		.n_voltages		= 1,
+	},
+	{
+		.name			= "vusb2",
+		.kind			= &mc34708_ldo_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 18),
+		.volt_table		= mc34708_vusb2_volt_table,
+		.n_voltages		= ARRAY_SIZE(mc34708_vusb2_volt_table),
+		.mode_reg		= 0x20,
+		.mode_mask		= (3 << 19),
+	},
+	{
+		.name			= "vdac",
+		.kind			= &mc34708_ldo_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 4),
+		.volt_table		= mc34708_vdac_volt_table,
+		.n_voltages		= ARRAY_SIZE(mc34708_vdac_volt_table),
+		.mode_reg		= 0x20,
+		.mode_mask		= (3 << 5),
+	},
+	{
+		.name			= "vgen1",
+		.kind			= &mc34708_ldo_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 0),
+		.volt_table		= mc34708_vgen1_volt_table,
+		.n_voltages		= ARRAY_SIZE(mc34708_vgen1_volt_table),
+		.mode_reg		= 0x20,
+		.mode_mask		= (1 << 1),
+	},
+	{
+		.name			= "vgen2",
+		.kind			= &mc34708_ldo_kind,
+		.enable_reg		= 0x20,
+		.enable_mask		= (1 << 12),
+		.volt_table		= mc34708_vgen2_volt_table,
+		.n_voltages		= ARRAY_SIZE(mc34708_vgen2_volt_table),
+		.mode_reg		= 0x20,
+		.mode_mask		= (3 << 13),
+	},
+};
+
+/*
+ * Setting some LDO standby states also requires changing the normal state.
+ * Therefore save the LDO configuration register on suspend and restore it
+ * on resume.
+ *
+ * This works because .set_suspend_X are called by the platform suspend handler
+ * AFTER device suspend
+ */
+#define MC34708_REG_REGMODE0 0x20
+
+static int mc34708_suspend(struct device *dev)
+{
+	struct mc34708_drv_data *mc34708_data = dev_get_drvdata(dev);
+
+	return mc13xxx_reg_read(mc34708_data->regulators[0].mc13xxx,
+				MC34708_REG_REGMODE0,
+				&mc34708_data->saved_regmode0);
+}
+
+static int mc34708_resume(struct device *dev)
+{
+	struct mc34708_drv_data *mc34708_data = dev_get_drvdata(dev);
+
+	return mc13xxx_reg_write(mc34708_data->regulators[0].mc13xxx,
+				MC34708_REG_REGMODE0,
+				mc34708_data->saved_regmode0);
+}
+
+static int mc34708_regulator_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int num_regs;
+	struct mc34708_drv_data *mc34708_data;
+	struct mc34708_regulator *mc34708_reg;
+	struct device_node *regs_np, *reg_np;
+	struct regulator_dev *rdev;
+	int ret;
+	int i;
+
+	regs_np = of_get_child_by_name(dev->parent->of_node, "regulators");
+	if (!regs_np)
+		return -ENODEV;
+
+	dev->of_node = regs_np;
+
+	num_regs = of_get_child_count(regs_np);
+	mc34708_data = devm_kzalloc(dev, sizeof(*mc34708_data) +
+					num_regs * sizeof(*mc34708_reg),
+					GFP_KERNEL);
+	if (!mc34708_data) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	dev_set_drvdata(dev, mc34708_data);
+
+	mc34708_reg = mc34708_data->regulators;
+	for_each_child_of_node(regs_np, reg_np) {
+		const struct mc34708_regulator_def *rd;
+		bool found;
+
+		found = false;
+		for (i = 0; i < ARRAY_SIZE(mc34708_regulator_defs); i++) {
+			rd = &mc34708_regulator_defs[i];
+
+			if (!of_node_cmp(reg_np->name, rd->name)) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			dev_warn(dev, "Unknown regulator '%s'\n", reg_np->name);
+			continue;
+		}
+
+		mc34708_reg->mc13xxx = dev_get_drvdata(dev->parent);
+		mc34708_reg->dev = dev;
+		mc34708_reg->def = rd;
+		mc34708_reg->desc.name = rd->name;
+		mc34708_reg->desc.supply_name = rd->supply_name;
+		mc34708_reg->desc.enable_reg = rd->enable_reg;
+		mc34708_reg->desc.enable_mask = rd->enable_mask;
+		mc34708_reg->desc.n_voltages = rd->n_voltages;
+		mc34708_reg->desc.fixed_uV = rd->fixed_uV;
+		mc34708_reg->desc.min_uV = rd->min_uV;
+		mc34708_reg->desc.uV_step = rd->uV_step;
+		mc34708_reg->desc.volt_table = rd->volt_table;
+		mc34708_reg->desc.vsel_reg = rd->vsel_reg;
+		mc34708_reg->desc.vsel_mask = rd->vsel_mask;
+		mc34708_reg->desc.of_map_mode = rd->kind->of_map_mode;
+		mc34708_reg->desc.ops = &rd->kind->ops;
+
+		mc34708_reg->config.init_data = of_get_regulator_init_data(dev,
+							reg_np,
+							&mc34708_reg->desc);
+		mc34708_reg->config.dev = dev;
+		mc34708_reg->config.of_node = reg_np;
+		mc34708_reg->config.driver_data = mc34708_reg;
+
+		if (rd->kind->setup) {
+			ret = rd->kind->setup(mc34708_reg);
+			if (ret)
+				goto out;
+		}
+
+		rdev = devm_regulator_register(dev,
+					       &mc34708_reg->desc,
+					       &mc34708_reg->config);
+		if (IS_ERR(rdev)) {
+			ret = PTR_ERR(rdev);
+			dev_err(dev,
+				"Failed to register regulator %s (%d)\n",
+				rd->name, ret);
+			goto out;
+		}
+
+		mc34708_reg++;
+	}
+
+	ret = 0;
+
+out:
+	of_node_put(regs_np);
+
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(mc34708_pm, mc34708_suspend, mc34708_resume);
+
+static struct platform_driver mc34708_regulator_driver = {
+	.driver	= {
+		.name	= "mc34708-regulator",
+		.pm	= &mc34708_pm,
+	},
+	.probe	= mc34708_regulator_probe,
+};
+
+static int __init mc34708_regulator_init(void)
+{
+	return platform_driver_register(&mc34708_regulator_driver);
+}
+subsys_initcall(mc34708_regulator_init);
+
+static void __exit mc34708_regulator_exit(void)
+{
+	platform_driver_unregister(&mc34708_regulator_driver);
+}
+module_exit(mc34708_regulator_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Martin Fuzzey <mfuzzey@parkeon.com>");
+MODULE_DESCRIPTION("Regulator Driver for Freescale MC34708 PMIC");
+MODULE_ALIAS("platform:mc34708-regulator");

Re: [PATCH 2/2] Regulator: add driver for Freescale MC34708

[Paul Bolle]

Just a nit: a license mismatch.

On Tue, 2015-04-28 at 16:17 +0200, Martin Fuzzey wrote:
> --- /dev/null
> +++ b/drivers/regulator/mc34708-regulator.c

> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of the
> + * License, or (at your option) any later version.

This states the license is GPL v2 or later.

> +MODULE_LICENSE("GPL v2");

And, according to inlcude/linux/module.h, this states the license is
(just) GPL v2. So I think either to comment at the top of this file or
the ident used in the MODULE_LICENSE() macro should be changed.

Thanks,


Paul Bolle

Re: [PATCH 2/2] Regulator: add driver for Freescale MC34708

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 5639 bytes --]

On Tue, Apr 28, 2015 at 04:17:40PM +0200, Martin Fuzzey wrote:
> Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>

Please use subject lines reflecting the style for the subsystem.

> +static int mc34708_read_bits(struct mc34708_regulator *mc34708_reg,
> +			     unsigned int reg, u32 mask)
> +{
> +	int ret;
> +	u32 val;
> +
> +	ret = mc13xxx_reg_read(mc34708_reg->mc13xxx, reg, &val);
> +	if (ret < 0)
> +		return ret;
> +
> +	val &= mask;
> +	val >>= ffs(mask) - 1;

Ick, this looks confusing - it's wrapping something which should hopefully
be a regmap in multiple layer.  The bitfield access helper does seem
reasonable though.

> +static int mc34708_update_bits(struct mc34708_regulator *mc34708_reg,
> +			       unsigned int reg, u32 mask, u32 val)
> +{
> +	val <<= ffs(mask) - 1;
> +
> +	return mc13xxx_reg_rmw(mc34708_reg->mc13xxx, reg, mask, val);

This is a wrapper for the widely used _update_bits() interface which has
a different interface - that's *definitely* confusing.

> +static int mc34708_get_voltage_sel(struct regulator_dev *rdev)
> +{
> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
> +
> +	return mc34708_read_bits(mc34708_reg,
> +				rdev->desc->vsel_reg, rdev->desc->vsel_mask);
> +}

Don't open code this, use the standard regmap helpers.

> +	val = mc34708_read_bits(mc34708_reg,
> +				mc34708_reg->def->mode_reg,
> +				mc34708_reg->def->mode_mask);
> +	if (val < 0)
> +		return ERR_PTR(val);
> +
> +	BUG_ON(val >= mc34708_reg->def->kind->num_hw_modes);

This is too severe, could be a hardware error.

> +static int mc34708_sw_find_hw_mode_sel(
> +	const struct mc34708_regulator_kind *kind,
> +	unsigned int normal,
> +	unsigned int standby)
> +{
> +	const struct mc34708_hw_mode *mode;
> +	int i;
> +
> +	for (i = 0, mode = kind->hw_modes;
> +			i < kind->num_hw_modes; i++, mode++) {
> +		if (mode->normal == -1 || mode->standby == -1)
> +			continue;
> +
> +		if (mode->standby != standby)
> +			continue;
> +
> +		if ((mode->normal == normal) ||
> +		    (normal && (mode->alt_normal == normal)))
> +			return i;
> +	}

I honestly don't really know what the above is supposed to do.  It's
mapping something to something but what exactly is unclear...  skipping
most of the rest of the mode code.

> +static int mc34708_swbst_mode_to_hwmode(unsigned int mode)
> +{
> +	switch (mode) {
> +	case REGULATOR_MODE_IDLE:
> +	case REGULATOR_MODE_STANDBY:
> +		return  MC34708_SW_OPMODE_PFM;

No, this is broken - you're mapping two different modes to one hardware
setting.  If the device doesn't support something it just doesn't
support it, let the upper layers work out how to handle that.

Also an extra space there.

> +static int mc34708_swbst_setup(struct mc34708_regulator *mc34708_reg)
> +{
> +	int val, mode;
> +
> +	val = mc34708_read_bits(mc34708_reg,
> +				mc34708_reg->def->mode_reg,
> +				mc34708_reg->def->mode_mask);
> +	if (val < 0)
> +		return val;
> +
> +	if (val > 0) {
> +		mode = mc34708_swbst_hwmode_to_mode(val);
> +		if (mode < 0)
> +			return mode;
> +
> +		mc34708_reg->req_mode_normal = mode;
> +	} else {
> +		/*
> +		 * If regulator is intially off we don't know the mode
> +		 * but we need a mode to be able to enable it later.
> +		 */
> +		mc34708_reg->req_mode_normal = REGULATOR_MODE_NORMAL;
> +	}

I don't really understand what the above is supposed to do, some
comments would probably help.

> +static int mc34708_swbst_enable(struct regulator_dev *rdev)
> +{
> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
> +
> +	return mc34708_update_bits(mc34708_reg,
> +					mc34708_reg->def->mode_reg,
> +					mc34708_reg->def->mode_mask,
> +					mc34708_reg->req_mode_normal);
> +}

Again use the standard regmap helpers.

> +static int mc34708_ldo_set_suspend_enable(struct regulator_dev *rdev)
> +{
> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
> +	int ret;
> +
> +	ret = mc34708_update_hw_mode(mc34708_reg,
> +				     mc34708_reg->req_mode_normal,
> +				     mc34708_reg->req_mode_standby);
> +	if (!ret)
> +		mc34708_reg->suspend_off = false;

This looks like it should be a noop.  It also seems very familiar from
some of the other code.

> +static int mc34708_ldo_set_suspend_mode(struct regulator_dev *rdev,
> +					unsigned int mode)
> +{
> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
> +	int ret;
> +
> +	if (!mc34708_ldo_has_mode_bit(mc34708_reg))
> +		return 0;

Again, if the driver doesn't support something don't implement it.

> +static const unsigned int mc34708_vgen1_volt_table[] = {
> +	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000
> +};

This looks like a linear mapping, use the standard helpers please.

> +/*
> + * Setting some LDO standby states also requires changing the normal state.
> + * Therefore save the LDO configuration register on suspend and restore it
> + * on resume.
> + *
> + * This works because .set_suspend_X are called by the platform suspend handler
> + * AFTER device suspend
> + */

That's not something you can rely on, I suggest omitting this for now
and doing it separately.

> +	num_regs = of_get_child_count(regs_np);
> +	mc34708_data = devm_kzalloc(dev, sizeof(*mc34708_data) +
> +					num_regs * sizeof(*mc34708_reg),
> +					GFP_KERNEL);
> +	if (!mc34708_data) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	dev_set_drvdata(dev, mc34708_data);
> +
> +	mc34708_reg = mc34708_data->regulators;
> +	for_each_child_of_node(regs_np, reg_np) {

No, this is broken - your driver should like all the others register all
the regulators on the device uncondtionally.  It should also be using
.of_match to allow the core to look up the init data.

[-- Attachment #2: Digital signature --]
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Re: [PATCH 2/2] Regulator: add driver for Freescale MC34708

[Martin Fuzzey]

Thank you for the review.

On 30/04/15 21:45, Mark Brown wrote:
> On Tue, Apr 28, 2015 at 04:17:40PM +0200, Martin Fuzzey wrote:
>> Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
> Please use subject lines reflecting the style for the subsystem.
>
You mean
regulator: mc34708: Add driver?

I ommitted the mc34708 part because it's a new driver

>> +static int mc34708_read_bits(struct mc34708_regulator *mc34708_reg,
>> +			     unsigned int reg, u32 mask)
>> +{
>> +	int ret;
>> +	u32 val;
>> +
>> +	ret = mc13xxx_reg_read(mc34708_reg->mc13xxx, reg, &val);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	val &= mask;
>> +	val >>= ffs(mask) - 1;
> Ick, this looks confusing - it's wrapping something which should hopefully
> be a regmap in multiple layer.  The bitfield access helper does seem
> reasonable though.

The reason for this wrapping stuff is that this is not a standalone 
driver, rather a "subdriver" of the mc13xxx MFD driver.
That already exists and supports the mc34708 (for the RTC for example) 
but not yet the regulator parts.
It does not expose regmap (although it does use it internally).
>> +static int mc34708_update_bits(struct mc34708_regulator *mc34708_reg,
>> +			       unsigned int reg, u32 mask, u32 val)
>> +{
>> +	val <<= ffs(mask) - 1;
>> +
>> +	return mc13xxx_reg_rmw(mc34708_reg->mc13xxx, reg, mask, val);
> This is a wrapper for the widely used _update_bits() interface which has
> a different interface - that's *definitely* confusing.
You are referring to the fact that the "val" parameter in my function is 
the non shifted value?
I think this makes the call sites much cleaner.
I get your point about it having the same name but different semantics 
as other functions though.
Would you be happier if I rename this to mc34708_set_bitfield() for example?


>> +static int mc34708_get_voltage_sel(struct regulator_dev *rdev)
>> +{
>> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
>> +
>> +	return mc34708_read_bits(mc34708_reg,
>> +				rdev->desc->vsel_reg, rdev->desc->vsel_mask);
>> +}
> Don't open code this, use the standard regmap helpers.
See above.
>
>> +	val = mc34708_read_bits(mc34708_reg,
>> +				mc34708_reg->def->mode_reg,
>> +				mc34708_reg->def->mode_mask);
>> +	if (val < 0)
>> +		return ERR_PTR(val);
>> +
>> +	BUG_ON(val >= mc34708_reg->def->kind->num_hw_modes);
> This is too severe, could be a hardware error.
The purpose of this function is to read a number of bits from the 
hardware and convert this to a hardware mode based on a lookup table.
The size of this lookup table should encompase all the possible values 
read from that bitfield.
Hence a hardware error alone won't trigger this unless the table size 
itself is wrong (a code BUG, not a hardware error).

I could change the check to use the mask though, rather than the value 
read from hardware to make this clearer.
>> +static int mc34708_sw_find_hw_mode_sel(
>> +	const struct mc34708_regulator_kind *kind,
>> +	unsigned int normal,
>> +	unsigned int standby)
>> +{
>> +	const struct mc34708_hw_mode *mode;
>> +	int i;
>> +
>> +	for (i = 0, mode = kind->hw_modes;
>> +			i < kind->num_hw_modes; i++, mode++) {
>> +		if (mode->normal == -1 || mode->standby == -1)
>> +			continue;
>> +
>> +		if (mode->standby != standby)
>> +			continue;
>> +
>> +		if ((mode->normal == normal) ||
>> +		    (normal && (mode->alt_normal == normal)))
>> +			return i;
>> +	}
> I honestly don't really know what the above is supposed to do.  It's
> mapping something to something but what exactly is unclear...  skipping
> most of the rest of the mode code.
The mode code is indeed complicated, but mostly because the hardware 
doesn't map directly nor orthogonally to the regulator framework concepts.

I tried to explain this in the block comments at the start of each the 
code for each type of regulator.
Looks like I failed :(

For the switching regulators:
There is a  4 bit "mode" field (which I call hwmode to distinguish from 
the regulator framework concept of mode.
This field encodes:
* The enable / disable state when the standby signal is not asserted 
(there is no seperate enable bit)
* The enable / disable state when the standby signal is not asserted
* The operating mode when the standby signal is asserted
* The operating mode when the standby signal is not asserted

Not all of the 16 possible values are valid. There is no documented or 
discernable direct mapping of the individual bits.

For the LDO regulators:
There is a dedicated enable bit (ouf)
There are 2 bits (VxMode, VxSTBY) controlling the regulator operating 
mode when the standaby signal is or is not asserted. However these bits 
are not seperate.
 From the comment block:

  *    VxMODE    VxSTBY        Normal    Standby
  *    0    0        ON    ON
  *    0    1        ON    OFF
  *    1    0        LP    LP
  *    1    1        ON    LP
  *

So, the function above takes the desired regulator modes for the normal 
and standby states (or 0 for off) and finds the corresponding hwmode 
(value to write to the register bits).

Then the way I handle all this is just use mc34708_sw_find_hw_mode_sel() 
to recalculate the hardware mode by walking the tables every time 
something needs to change.
The table is different depending on the regulator type.

This turned out to be *much* simpler that the initial open code approach 
I first tried.


>> +static int mc34708_swbst_mode_to_hwmode(unsigned int mode)
>> +{
>> +	switch (mode) {
>> +	case REGULATOR_MODE_IDLE:
>> +	case REGULATOR_MODE_STANDBY:
>> +		return  MC34708_SW_OPMODE_PFM;
> No, this is broken - you're mapping two different modes to one hardware
> setting.  If the device doesn't support something it just doesn't
> support it, let the upper layers work out how to handle that.
Ok
> Also an extra space there.
>
>> +static int mc34708_swbst_setup(struct mc34708_regulator *mc34708_reg)
>> +{
>> +	int val, mode;
>> +
>> +	val = mc34708_read_bits(mc34708_reg,
>> +				mc34708_reg->def->mode_reg,
>> +				mc34708_reg->def->mode_mask);
>> +	if (val < 0)
>> +		return val;
>> +
>> +	if (val > 0) {
>> +		mode = mc34708_swbst_hwmode_to_mode(val);
>> +		if (mode < 0)
>> +			return mode;
>> +
>> +		mc34708_reg->req_mode_normal = mode;
>> +	} else {
>> +		/*
>> +		 * If regulator is intially off we don't know the mode
>> +		 * but we need a mode to be able to enable it later.
>> +		 */
>> +		mc34708_reg->req_mode_normal = REGULATOR_MODE_NORMAL;
>> +	}
> I don't really understand what the above is supposed to do, some
> comments would probably help.
We need to store the desired modes (for normal and standby state) since 
.set_mode() and .set_suspend_mode() are not always called before 
enable() / disable().
For example, for a .enable() on a switching regulator requires the 
desired normal and standby mode to be known (to find the appropriate 
value for the hardware mode bits since there is no hardware enable bit.
I try to determine the current mode at startup to initialise the desired 
mode for a later enable by reading the registers but that is only 
possible if the regulator is already enabled.
The hardware has no concept of "disabled but will be in PFM mode when 
enabled" for example.

>> +static int mc34708_ldo_set_suspend_enable(struct regulator_dev *rdev)
>> +{
>> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
>> +	int ret;
>> +
>> +	ret = mc34708_update_hw_mode(mc34708_reg,
>> +				     mc34708_reg->req_mode_normal,
>> +				     mc34708_reg->req_mode_standby);
>> +	if (!ret)
>> +		mc34708_reg->suspend_off = false;
> This looks like it should be a noop.  It also seems very familiar from
> some of the other code.
It's not a noop.

If .set_suspend_disable() is called then later .set_suspend_enable() the 
regulator needs to be recofigured.
Note that neither .set_suspend_enable(), nor .set_suspend_disable() 
change the stored modes (req_mode_normal, req_mode_standby) since the 
regulator framework seperates the concept of enable and mode but this 
hardware does not.
>> +static int mc34708_ldo_set_suspend_mode(struct regulator_dev *rdev,
>> +					unsigned int mode)
>> +{
>> +	struct mc34708_regulator *mc34708_reg = rdev->reg_data;
>> +	int ret;
>> +
>> +	if (!mc34708_ldo_has_mode_bit(mc34708_reg))
>> +		return 0;
> Again, if the driver doesn't support something don't implement it.
>
Ok
>> +static const unsigned int mc34708_vgen1_volt_table[] = {
>> +	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000
>> +};
> This looks like a linear mapping, use the standard helpers please.
Ok
>> +/*
>> + * Setting some LDO standby states also requires changing the normal state.
>> + * Therefore save the LDO configuration register on suspend and restore it
>> + * on resume.
>> + *
>> + * This works because .set_suspend_X are called by the platform suspend handler
>> + * AFTER device suspend
>> + */
> That's not something you can rely on, I suggest omitting this for now
> and doing it separately.
>
>> +	num_regs = of_get_child_count(regs_np);
>> +	mc34708_data = devm_kzalloc(dev, sizeof(*mc34708_data) +
>> +					num_regs * sizeof(*mc34708_reg),
>> +					GFP_KERNEL);
>> +	if (!mc34708_data) {
>> +		ret = -ENOMEM;
>> +		goto out;
>> +	}
>> +
>> +	dev_set_drvdata(dev, mc34708_data);
>> +
>> +	mc34708_reg = mc34708_data->regulators;
>> +	for_each_child_of_node(regs_np, reg_np) {
> No, this is broken - your driver should like all the others register all
> the regulators on the device uncondtionally.  It should also be using
> .of_match to allow the core to look up the init data.
Ok

Re: [PATCH 2/2] Regulator: add driver for Freescale MC34708

[Mark Brown]

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On Mon, May 11, 2015 at 11:04:39AM +0200, Martin Fuzzey wrote:

Please leave blank lines between paragraphs and between old text and new
text, it makes things a lot easier to read - this is extremely difficult
to follow.

> On 30/04/15 21:45, Mark Brown wrote:
> >On Tue, Apr 28, 2015 at 04:17:40PM +0200, Martin Fuzzey wrote:
> >>Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
> >Please use subject lines reflecting the style for the subsystem.

> You mean
> regulator: mc34708: Add driver?

> I ommitted the mc34708 part because it's a new driver

That and the fact that you spelt regulator Regulator.

> >Ick, this looks confusing - it's wrapping something which should hopefully
> >be a regmap in multiple layer.  The bitfield access helper does seem
> >reasonable though.

> The reason for this wrapping stuff is that this is not a standalone driver,
> rather a "subdriver" of the mc13xxx MFD driver.
> That already exists and supports the mc34708 (for the RTC for example) but
> not yet the regulator parts.
> It does not expose regmap (although it does use it internally).

Well, fix that then...

> Would you be happier if I rename this to mc34708_set_bitfield() for example?

I guess, it would probably be preferable to go with the more common
_update_bits() pattern though.

> Then the way I handle all this is just use mc34708_sw_find_hw_mode_sel() to
> recalculate the hardware mode by walking the tables every time something
> needs to change.
> The table is different depending on the regulator type.
> 
> This turned out to be *much* simpler that the initial open code approach I
> first tried.

This all needs to be apparent to someone reading the code.  Probably
having comments about what individual functions are supposed to be doing
would help a lot here.

> >I don't really understand what the above is supposed to do, some
> >comments would probably help.

> We need to store the desired modes (for normal and standby state) since
> .set_mode() and .set_suspend_mode() are not always called before enable() /
> disable().

The point is that this needs to be something someone reading the code
could reasonably be expected to understand.

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Re: [PATCH 2/2] Regulator: add driver for Freescale MC34708

[Stefan Wahren]

Hi Martin,

> Martin Fuzzey <mfuzzey@parkeon.com> hat am 28. April 2015 um 16:17
> geschrieben:
>
>
> [...]
> diff --git a/drivers/regulator/mc34708-regulator.c
> b/drivers/regulator/mc34708-regulator.c
> new file mode 100644
> index 0000000..b5ff727
> --- /dev/null
> +++ b/drivers/regulator/mc34708-regulator.c
> @@ -0,0 +1,1266 @@
> +/*
> + * Driver for regulators in the Fresscale MC34708/9 PMICs
> + *

just a typo: Freescale

Stefan

Re: [PATCH 0/2] regulator: Add regulator driver for the MC34708 PMIC

[Stefan Wahren]

Hi Martin,

> Martin Fuzzey <mfuzzey@parkeon.com> hat am 28. April 2015 um 16:17
> geschrieben:
>
>
> Add regulator driver and associated DT bindings for the regulators in the
> Freescale MC34708 PMIC.

from my understanding this PMIC is used typically for i.MX50/53 SoCs. So in this
case
it would make sense to mention it here and CC this patch series also to the IMX
maintainers.

Btw 

git format-patch --cover-letter

is your friend.

Stefan

>
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