Commit ee30928a authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Mark Brown
Browse files

regulator: fan53555: add support for Silergy SYR82x regulators 



Silergy SYR82x regulators share the exact same functionality and register layout
as the Fairchild FAN53555 regulators. Therefore extend the driver to add
support for them.

Both types use the same vendor id in their ID1 register, so it's not possible
to distinguish them automatically.

Similarly, the types also do not match. Type 8 used by the SYR827 and SYR828
start at 712.5mV and increment in 12.5mv steps, while the FAN53555 type 8
starts at 600mV and increments in 10mV steps.

Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 91f23d8f

Documentation/devicetree/bindings/regulator/fan53555.txt

+1 −1
Original line number Diff line number Diff line 
Binding for Fairchild FAN53555 regulators



Required properties:

  - compatible: "fcs,fan53555"

  - compatible: one of "fcs,fan53555", "silergy,syr827", "silergy,syr828"

  - reg: I2C address



Optional properties:

Documentation/devicetree/bindings/vendor-prefixes.txt

+1 −0
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ sil Silicon Image 
silabs	Silicon Laboratories

simtek

sii	Seiko Instruments, Inc.

silergy	Silergy Corp.

sirf	SiRF Technology, Inc.

smsc	Standard Microsystems Corporation

snps 	Synopsys, Inc.

drivers/regulator/fan53555.c

+87 −15
Original line number Diff line number Diff line
@@ -52,6 +52,11 @@ 


#define FAN53555_NVOLTAGES	64	/* Numbers of voltages */



enum fan53555_vendor {

	FAN53555_VENDOR_FAIRCHILD = 0,

	FAN53555_VENDOR_SILERGY,

};



/* IC Type */

enum {

	FAN53555_CHIP_ID_00 = 0,
@@ -62,7 +67,12 @@ enum { 
	FAN53555_CHIP_ID_05,

};



enum {

	SILERGY_SYR82X = 8,

};



struct fan53555_device_info {

	enum fan53555_vendor vendor;

	struct regmap *regmap;

	struct device *dev;

	struct regulator_desc desc;
@@ -183,6 +193,47 @@ static struct regulator_ops fan53555_regulator_ops = { 
	.set_ramp_delay = fan53555_set_ramp,

};



static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)

{

	/* Init voltage range and step */

	switch (di->chip_id) {

	case FAN53555_CHIP_ID_00:

	case FAN53555_CHIP_ID_01:

	case FAN53555_CHIP_ID_03:

	case FAN53555_CHIP_ID_05:

		di->vsel_min = 600000;

		di->vsel_step = 10000;

		break;

	case FAN53555_CHIP_ID_04:

		di->vsel_min = 603000;

		di->vsel_step = 12826;

		break;

	default:

		dev_err(di->dev,

			"Chip ID %d not supported!\n", di->chip_id);

		return -EINVAL;

	}



	return 0;

}



static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)

{

	/* Init voltage range and step */

	switch (di->chip_id) {

	case SILERGY_SYR82X:

		di->vsel_min = 712500;

		di->vsel_step = 12500;

		break;

	default:

		dev_err(di->dev,

			"Chip ID %d not supported!\n", di->chip_id);

		return -EINVAL;

	}



	return 0;

}



/* For 00,01,03,05 options:

 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.

 * For 04 option:
@@ -191,6 +242,8 @@ static struct regulator_ops fan53555_regulator_ops = { 
static int fan53555_device_setup(struct fan53555_device_info *di,

				struct fan53555_platform_data *pdata)

{

	int ret = 0;



	/* Setup voltage control register */

	switch (pdata->sleep_vsel_id) {

	case FAN53555_VSEL_ID_0:
@@ -205,26 +258,21 @@ static int fan53555_device_setup(struct fan53555_device_info *di, 
		dev_err(di->dev, "Invalid VSEL ID!\n");

		return -EINVAL;

	}

	/* Init voltage range and step */

	switch (di->chip_id) {

	case FAN53555_CHIP_ID_00:

	case FAN53555_CHIP_ID_01:

	case FAN53555_CHIP_ID_03:

	case FAN53555_CHIP_ID_05:

		di->vsel_min = 600000;

		di->vsel_step = 10000;



	switch (di->vendor) {

	case FAN53555_VENDOR_FAIRCHILD:

		ret = fan53555_voltages_setup_fairchild(di);

		break;

	case FAN53555_CHIP_ID_04:

		di->vsel_min = 603000;

		di->vsel_step = 12826;

	case FAN53555_VENDOR_SILERGY:

		ret = fan53555_voltages_setup_silergy(di);

		break;

	default:

		dev_err(di->dev,

			"Chip ID[%d]\n not supported!\n", di->chip_id);

			"vendor %d not supported!\n", di->chip_id);

		return -EINVAL;

	}



	return 0;

	return ret;

}



static int fan53555_regulator_register(struct fan53555_device_info *di,
@@ -278,6 +326,13 @@ static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev, 
static const struct of_device_id fan53555_dt_ids[] = {

	{

		.compatible = "fcs,fan53555",

		.data = (void *)FAN53555_VENDOR_FAIRCHILD

	}, {

		.compatible = "silergy,syr827",

		.data = (void *)FAN53555_VENDOR_SILERGY,

	}, {

		.compatible = "silergy,syr828",

		.data = (void *)FAN53555_VENDOR_SILERGY,

	},

	{ }

};
@@ -307,7 +362,16 @@ static int fan53555_regulator_probe(struct i2c_client *client, 
	if (!di)

		return -ENOMEM;



	if (!client->dev.of_node) {

	if (client->dev.of_node) {

		const struct of_device_id *match;



		match = of_match_device(of_match_ptr(fan53555_dt_ids),

					&client->dev);

		if (!match)

			return -ENODEV;



		di->vendor = (int) match->data;

	} else {

		/* if no ramp constraint set, get the pdata ramp_delay */

		if (!di->regulator->constraints.ramp_delay) {

			int slew_idx = (pdata->slew_rate & 0x7)
@@ -316,6 +380,8 @@ static int fan53555_regulator_probe(struct i2c_client *client, 
			di->regulator->constraints.ramp_delay

						= slew_rates[slew_idx];

		}



		di->vendor = id->driver_data;

	}



	di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
@@ -363,7 +429,13 @@ static int fan53555_regulator_probe(struct i2c_client *client, 
}



static const struct i2c_device_id fan53555_id[] = {

	{"fan53555", -1},

	{

		.name = "fan53555",

		.driver_data = FAN53555_VENDOR_FAIRCHILD

	}, {

		.name = "syr82x",

		.driver_data = FAN53555_VENDOR_SILERGY

	},

	{ },

};

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