Unverified Commit 4e70b26c authored by Samuel Holland's avatar Samuel Holland Committed by Mark Brown
Browse files

regulator: sun20i: Add Allwinner D1 LDOs driver 



D1 contains two pairs of LDOs, "analog" LDOs and "system" LDOs. They are
similar and can share a driver, but only the system LDOs have a DT
binding defined so far.

The system LDOs have a single linear range. The voltage step is not an
integer, so a custom .list_voltage is needed to get the rounding right.

Signed-off-by: default avatarSamuel Holland <samuel@sholland.org>
Reviewed-by: default avatarAndre Przywara <andre.przywara@arm.com>
Reviewed-by: default avatarJernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: default avatarChen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20240509153107.438220-3-wens@kernel.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 622bab18

drivers/regulator/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -1415,6 +1415,14 @@ config REGULATOR_STW481X_VMMC 
	  This driver supports the internal VMMC regulator in the STw481x

	  PMIC chips.



config REGULATOR_SUN20I

	tristate "Allwinner D1 internal LDOs"

	depends on ARCH_SUNXI || COMPILE_TEST

	select MFD_SYSCON

	default ARCH_SUNXI

	help

	  This driver supports the internal LDOs in the Allwinner D1 SoC.



config REGULATOR_SY7636A

	tristate "Silergy SY7636A voltage regulator"

	depends on MFD_SY7636A

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -163,6 +163,7 @@ obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o 
obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o

obj-$(CONFIG_REGULATOR_STPMIC1) += stpmic1_regulator.o

obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o

obj-$(CONFIG_REGULATOR_SUN20I) += sun20i-regulator.o

obj-$(CONFIG_REGULATOR_SY7636A) += sy7636a-regulator.o

obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o

obj-$(CONFIG_REGULATOR_SY8824X) += sy8824x.o

drivers/regulator/sun20i-regulator.c

0 → 100644
+157 −0
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// SPDX-License-Identifier: GPL-2.0-only

//

// Copyright (c) 2021-2022 Samuel Holland <samuel@sholland.org>

//



#include <linux/mfd/syscon.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>



#define SUN20I_SYS_LDO_CTRL_REG		0x150



struct sun20i_regulator_data {

	const struct regulator_desc	*descs;

	unsigned int			ndescs;

};



/* regulator_list_voltage_linear() modified for the non-integral uV_step. */

static int sun20i_d1_system_ldo_list_voltage(struct regulator_dev *rdev,

					     unsigned int selector)

{

	const struct regulator_desc *desc = rdev->desc;

	unsigned int fraction, uV;



	if (selector >= desc->n_voltages)

		return -EINVAL;



	uV = desc->min_uV + (desc->uV_step * selector);

	fraction = selector + (desc->min_uV % 4);



	if (uV > 1606667)

		uV += 6667;

	else

		fraction++;



	/* Produce correctly-rounded absolute voltages. */

	return uV + (fraction / 3);

}



static const struct regulator_ops sun20i_d1_system_ldo_ops = {

	.list_voltage		= sun20i_d1_system_ldo_list_voltage,

	.map_voltage		= regulator_map_voltage_ascend,

	.set_voltage_sel	= regulator_set_voltage_sel_regmap,

	.get_voltage_sel	= regulator_get_voltage_sel_regmap,

};



static const struct regulator_desc sun20i_d1_system_ldo_descs[] = {

	{

		.name		= "ldoa",

		.supply_name	= "ldo-in",

		.of_match	= "ldoa",

		.ops		= &sun20i_d1_system_ldo_ops,

		.type		= REGULATOR_VOLTAGE,

		.owner		= THIS_MODULE,

		.n_voltages	= 32,

		.min_uV		= 1593333,

		.uV_step	= 13333, /* repeating */

		.vsel_reg	= SUN20I_SYS_LDO_CTRL_REG,

		.vsel_mask	= GENMASK(7, 0),

	},

	{

		.name		= "ldob",

		.supply_name	= "ldo-in",

		.of_match	= "ldob",

		.ops		= &sun20i_d1_system_ldo_ops,

		.type		= REGULATOR_VOLTAGE,

		.owner		= THIS_MODULE,

		.n_voltages	= 64,

		.min_uV		= 1166666,

		.uV_step	= 13333, /* repeating */

		.vsel_reg	= SUN20I_SYS_LDO_CTRL_REG,

		.vsel_mask	= GENMASK(15, 8),

	},

};



static const struct sun20i_regulator_data sun20i_d1_system_ldos = {

	.descs	= sun20i_d1_system_ldo_descs,

	.ndescs	= ARRAY_SIZE(sun20i_d1_system_ldo_descs),

};



static struct regmap *sun20i_regulator_get_regmap(struct device *dev)

{

	struct regmap *regmap;



	/*

	 * First try the syscon interface. The system control device is not

	 * compatible with "syscon", so fall back to getting the regmap from

	 * its platform device. This is ugly, but required for devicetree

	 * backward compatibility.

	 */

	regmap = syscon_node_to_regmap(dev->parent->of_node);

	if (!IS_ERR(regmap))

		return regmap;



	regmap = dev_get_regmap(dev->parent, NULL);

	if (regmap)

		return regmap;



	return ERR_PTR(-EPROBE_DEFER);

}



static int sun20i_regulator_probe(struct platform_device *pdev)

{

	const struct sun20i_regulator_data *data;

	struct device *dev = &pdev->dev;

	struct regulator_config config;

	struct regmap *regmap;



	data = of_device_get_match_data(dev);

	if (!data)

		return -EINVAL;



	regmap = sun20i_regulator_get_regmap(dev);

	if (IS_ERR(regmap))

		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to get regmap\n");



	config = (struct regulator_config) {

		.dev	= dev,

		.regmap	= regmap,

	};



	for (unsigned int i = 0; i < data->ndescs; ++i) {

		const struct regulator_desc *desc = &data->descs[i];

		struct regulator_dev *rdev;



		rdev = devm_regulator_register(dev, desc, &config);

		if (IS_ERR(rdev))

			return PTR_ERR(rdev);

	}



	return 0;

}



static const struct of_device_id sun20i_regulator_of_match[] = {

	{

		.compatible = "allwinner,sun20i-d1-system-ldos",

		.data = &sun20i_d1_system_ldos,

	},

	{ },

};

MODULE_DEVICE_TABLE(of, sun20i_regulator_of_match);



static struct platform_driver sun20i_regulator_driver = {

	.probe	= sun20i_regulator_probe,

	.driver	= {

		.name		= "sun20i-regulator",

		.of_match_table	= sun20i_regulator_of_match,

	},

};

module_platform_driver(sun20i_regulator_driver);



MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>");

MODULE_DESCRIPTION("Allwinner D1 internal LDO driver");

MODULE_LICENSE("GPL");