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Date: Wed, 17 Apr 2013 14:51:34 +0100
From: Graeme Gregory <gg@...mlogic.co.uk>
To: Laxman Dewangan <ldewangan@...dia.com>
CC: broonie@...nel.org, sameo@...ux.intel.com, ian@...mlogic.co.uk,
linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 2/3] regulator: palmas: support for external regulator
through control outputs
This looks good to me with one proviso!
SYSEN1/2 are not necessarily for regulators as given by the name, they
are more for use indicating to other chips that power is now
available/stable.
But it will not break things to have them exposed in regulator API so I
shall leave this to Mark.
Graeme
On 17/04/13 10:43, Laxman Dewangan wrote:
> Palmas device have control outputs like REGEN1, REGEN2, REGEN3,
> SYSEN1 and SYSEN2. These control outputs can be used for controlling
> external voltage switches to enabled/disable voltage outputs.
>
> Add support of these control outputs through regulator framework.
>
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
> drivers/regulator/palmas-regulator.c | 95 +++++++++++++++++++++++++++++----
> include/linux/mfd/palmas.h | 6 ++
> 2 files changed, 89 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
> index 7c7992b..28080a7 100644
> --- a/drivers/regulator/palmas-regulator.c
> +++ b/drivers/regulator/palmas-regulator.c
> @@ -166,6 +166,26 @@ static const struct regs_info palmas_regs_info[] = {
> .vsel_addr = PALMAS_LDOUSB_VOLTAGE,
> .ctrl_addr = PALMAS_LDOUSB_CTRL,
> },
> + {
> + .name = "REGEN1",
> + .ctrl_addr = PALMAS_REGEN1_CTRL,
> + },
> + {
> + .name = "REGEN2",
> + .ctrl_addr = PALMAS_REGEN2_CTRL,
> + },
> + {
> + .name = "REGEN3",
> + .ctrl_addr = PALMAS_REGEN3_CTRL,
> + },
> + {
> + .name = "SYSEN1",
> + .ctrl_addr = PALMAS_SYSEN1_CTRL,
> + },
> + {
> + .name = "SYSEN2",
> + .ctrl_addr = PALMAS_SYSEN2_CTRL,
> + },
> };
>
> #define SMPS_CTRL_MODE_OFF 0x00
> @@ -423,6 +443,12 @@ static struct regulator_ops palmas_ops_ldo = {
> .map_voltage = regulator_map_voltage_linear,
> };
>
> +static struct regulator_ops palmas_ops_extreg = {
> + .is_enabled = regulator_is_enabled_regmap,
> + .enable = regulator_enable_regmap,
> + .disable = regulator_disable_regmap,
> +};
> +
> /*
> * setup the hardware based sleep configuration of the SMPS/LDO regulators
> * from the platform data. This is different to the software based control
> @@ -524,6 +550,28 @@ static int palmas_ldo_init(struct palmas *palmas, int id,
> return 0;
> }
>
> +static int palmas_extreg_init(struct palmas *palmas, int id,
> + struct palmas_reg_init *reg_init)
> +{
> + unsigned int addr;
> + int ret;
> + unsigned int val = 0;
> +
> + addr = palmas_regs_info[id].ctrl_addr;
> +
> + if (reg_init->mode_sleep)
> + val = PALMAS_REGEN1_CTRL_MODE_SLEEP;
> +
> + ret = palmas_update_bits(palmas, PALMAS_RESOURCE_BASE,
> + addr, PALMAS_REGEN1_CTRL_MODE_SLEEP, val);
> + if (ret < 0) {
> + dev_err(palmas->dev, "Resource reg 0x%02x update failed %d\n",
> + addr, ret);
> + return ret;
> + }
> + return 0;
> +}
> +
> static struct of_regulator_match palmas_matches[] = {
> { .name = "smps12", },
> { .name = "smps123", },
> @@ -546,6 +594,11 @@ static struct of_regulator_match palmas_matches[] = {
> { .name = "ldo9", },
> { .name = "ldoln", },
> { .name = "ldousb", },
> + { .name = "regen1", },
> + { .name = "regen2", },
> + { .name = "regen3", },
> + { .name = "sysen1", },
> + { .name = "sysen2", },
> };
>
> static void palmas_dt_to_pdata(struct device *dev,
> @@ -764,21 +817,34 @@ static int palmas_regulators_probe(struct platform_device *pdev)
> /* Register the regulators */
> pmic->desc[id].name = palmas_regs_info[id].name;
> pmic->desc[id].id = id;
> - pmic->desc[id].n_voltages = PALMAS_LDO_NUM_VOLTAGES;
> -
> - pmic->desc[id].ops = &palmas_ops_ldo;
> -
> pmic->desc[id].type = REGULATOR_VOLTAGE;
> pmic->desc[id].owner = THIS_MODULE;
> - pmic->desc[id].min_uV = 900000;
> - pmic->desc[id].uV_step = 50000;
> - pmic->desc[id].linear_min_sel = 1;
> - pmic->desc[id].vsel_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
> +
> + if (id < PALMAS_REG_REGEN1) {
> + pmic->desc[id].n_voltages = PALMAS_LDO_NUM_VOLTAGES;
> + pmic->desc[id].ops = &palmas_ops_ldo;
> + pmic->desc[id].min_uV = 900000;
> + pmic->desc[id].uV_step = 50000;
> + pmic->desc[id].linear_min_sel = 1;
> + pmic->desc[id].vsel_reg =
> + PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
> palmas_regs_info[id].vsel_addr);
> - pmic->desc[id].vsel_mask = PALMAS_LDO1_VOLTAGE_VSEL_MASK;
> - pmic->desc[id].enable_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
> + pmic->desc[id].vsel_mask =
> + PALMAS_LDO1_VOLTAGE_VSEL_MASK;
> + pmic->desc[id].enable_reg =
> + PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
> + palmas_regs_info[id].ctrl_addr);
> + pmic->desc[id].enable_mask =
> + PALMAS_LDO1_CTRL_MODE_ACTIVE;
> + } else {
> + pmic->desc[id].n_voltages = 1;
> + pmic->desc[id].ops = &palmas_ops_extreg;
> + pmic->desc[id].enable_reg =
> + PALMAS_BASE_TO_REG(PALMAS_RESOURCE_BASE,
> palmas_regs_info[id].ctrl_addr);
> - pmic->desc[id].enable_mask = PALMAS_LDO1_CTRL_MODE_ACTIVE;
> + pmic->desc[id].enable_mask =
> + PALMAS_REGEN1_CTRL_MODE_ACTIVE;
> + }
>
> if (pdata)
> config.init_data = pdata->reg_data[id];
> @@ -804,7 +870,12 @@ static int palmas_regulators_probe(struct platform_device *pdev)
> if (pdata) {
> reg_init = pdata->reg_init[id];
> if (reg_init) {
> - ret = palmas_ldo_init(palmas, id, reg_init);
> + if (id < PALMAS_REG_REGEN1)
> + ret = palmas_ldo_init(palmas,
> + id, reg_init);
> + else
> + ret = palmas_extreg_init(palmas,
> + id, reg_init);
> if (ret) {
> regulator_unregister(pmic->rdev[id]);
> goto err_unregister_regulator;
> diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
> index 4a066d0..fb04d07 100644
> --- a/include/linux/mfd/palmas.h
> +++ b/include/linux/mfd/palmas.h
> @@ -164,6 +164,12 @@ enum palmas_regulators {
> PALMAS_REG_LDO9,
> PALMAS_REG_LDOLN,
> PALMAS_REG_LDOUSB,
> + /* External regulators */
> + PALMAS_REG_REGEN1,
> + PALMAS_REG_REGEN2,
> + PALMAS_REG_REGEN3,
> + PALMAS_REG_SYSEN1,
> + PALMAS_REG_SYSEN2,
> /* Total number of regulators */
> PALMAS_NUM_REGS,
> };
--
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