RE: [PATCH 3/5] regulator: da9062: add voltage selection gpio support

From: Adam Thomson
Date: Tue Sep 24 2019 - 05:48:53 EST

On 17 September 2019 13:43, Marco Felsch wrote:

> The DA9062/1 devices can switch their regulator voltages between
> voltage-A (active) and voltage-B (suspend) settings. Switching the
> voltages can be controlled by ther internal state-machine or by a gpio
> input signal and can be configured for each individual regulator. This
> commit adds the gpio-based voltage switching support.
>
> Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
> ---
> drivers/regulator/da9062-regulator.c | 149 +++++++++++++++++++++++++++
> 1 file changed, 149 insertions(+)
>
> diff --git a/drivers/regulator/da9062-regulator.c b/drivers/regulator/da9062-
> regulator.c
> index 9b2ca472f70c..9d6eb7625948 100644
> --- a/drivers/regulator/da9062-regulator.c
> +++ b/drivers/regulator/da9062-regulator.c
> @@ -7,6 +7,7 @@
> #include <linux/module.h>
> #include <linux/init.h>
> #include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/slab.h>
> #include <linux/of.h>
> #include <linux/platform_device.h>
> @@ -15,6 +16,7 @@
> #include <linux/regulator/machine.h>
> #include <linux/regulator/of_regulator.h>
> #include <linux/mfd/da9062/core.h>
> +#include <linux/mfd/da9062/gpio.h>
> #include <linux/mfd/da9062/registers.h>
>
> /* Regulator IDs */
> @@ -50,6 +52,7 @@ struct da9062_regulator_info {
> struct reg_field sleep;
> struct reg_field suspend_sleep;
> unsigned int suspend_vsel_reg;
> + struct reg_field vsel_gpi;
> /* Event detection bit */
> struct reg_field oc_event;
> };
> @@ -65,6 +68,7 @@ struct da9062_regulator {
> struct regmap_field *suspend;
> struct regmap_field *sleep;
> struct regmap_field *suspend_sleep;
> + struct regmap_field *vsel_gpi;
> };
>
> /* Encapsulates all information for the regulators driver */
> @@ -351,6 +355,65 @@ static const struct regulator_ops da9062_ldo_ops = {
> .set_suspend_mode = da9062_ldo_set_suspend_mode,
> };
>
> +static int da9062_config_gpi(struct device_node *np,
> + const struct regulator_desc *desc,
> + struct regulator_config *cfg, const char *gpi_id)
> +{
> + struct da9062_regulator *regl = cfg->driver_data;
> + struct gpio_desc *gpi;
> + unsigned int nr;
> + int ret;
> + char *prop, *label;
> +
> + prop = kasprintf(GFP_KERNEL, "dlg,%s-sense-gpios", gpi_id);
> + if (!prop)
> + return -ENOMEM;
> + label = kasprintf(GFP_KERNEL, "%s-%s-gpi", desc->name, gpi_id);
> + if (!label) {
> + ret = -ENOMEM;
> + goto free;

If we use the generic bindings names then the above will change I guess.

> + }
> +
> + /*
> + * We only must ensure that the gpio device is probed before the
> + * regulator driver so no need to store the reference global. Luckily
> + * devm_* releases the gpio upon a unbound action.
> + */
> + gpi = devm_gpiod_get_from_of_node(cfg->dev, np, prop, 0, GPIOD_IN |
> + GPIOD_FLAGS_BIT_NONEXCLUSIVE,
> label);
> + if (IS_ERR(gpi)) {
> + ret = PTR_ERR(gpi);
> + goto free;
> + }
> +
> + if (!gpi) {
> + ret = 0;
> + goto free;
> + }
> +
> + /* We need the local number */
> + nr = da9062_gpio_get_hwgpio(gpi);
> + if (nr < 1 || nr > 3) {
> + ret = -EINVAL;
> + goto free;
> + }
> +
> + ret = regmap_field_write(regl->vsel_gpi, nr);

Actually thinking about this some more, should we really be setting alternate
functions of the GPIO here? Would this not be done through GPIO/Pinmux
frameworks? That way the GPIO would be blocked off from other's requesting it.
This seems a little unsafe, unless I'm mistaken.

> +
> +free:
> + kfree(prop);
> + kfree(label);
> +
> + return ret;
> +}
> +
> +static int da9062_parse_dt(struct device_node *np,
> + const struct regulator_desc *desc,
> + struct regulator_config *cfg)
> +{
> + return da9062_config_gpi(np, desc, cfg, "vsel");
> +}
> +
> /* DA9061 Regulator information */
> static const struct da9062_regulator_info local_da9061_regulator_info[] = {
> {
> @@ -358,6 +421,7 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> .desc.name = "DA9061 BUCK1",
> .desc.of_match = of_match_ptr("buck1"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (300) * 1000,
> .desc.uV_step = (10) * 1000,
> @@ -388,12 +452,17 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK1_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK1_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK1_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK1_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK1_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9061_ID_BUCK2,
> .desc.name = "DA9061 BUCK2",
> .desc.of_match = of_match_ptr("buck2"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (800) * 1000,
> .desc.uV_step = (20) * 1000,
> @@ -424,12 +493,17 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK3_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK3_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK3_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK3_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK3_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9061_ID_BUCK3,
> .desc.name = "DA9061 BUCK3",
> .desc.of_match = of_match_ptr("buck3"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (530) * 1000,
> .desc.uV_step = (10) * 1000,
> @@ -460,12 +534,17 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK4_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK4_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK4_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK4_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK4_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9061_ID_LDO1,
> .desc.name = "DA9061 LDO1",
> .desc.of_match = of_match_ptr("ldo1"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -489,6 +568,10 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO1_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO1_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO1_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO1_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO1_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO1_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -499,6 +582,7 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> .desc.name = "DA9061 LDO2",
> .desc.of_match = of_match_ptr("ldo2"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -522,6 +606,10 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO2_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO2_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO2_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO2_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO2_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO2_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -532,6 +620,7 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> .desc.name = "DA9061 LDO3",
> .desc.of_match = of_match_ptr("ldo3"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -555,6 +644,10 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO3_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO3_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO3_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO3_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO3_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO3_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -565,6 +658,7 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> .desc.name = "DA9061 LDO4",
> .desc.of_match = of_match_ptr("ldo4"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -588,6 +682,10 @@ static const struct da9062_regulator_info
> local_da9061_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO4_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO4_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO4_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO4_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO4_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO4_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -602,6 +700,7 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> .desc.name = "DA9062 BUCK1",
> .desc.of_match = of_match_ptr("buck1"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (300) * 1000,
> .desc.uV_step = (10) * 1000,
> @@ -632,12 +731,17 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK1_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK1_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK1_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK1_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK1_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9062_ID_BUCK2,
> .desc.name = "DA9062 BUCK2",
> .desc.of_match = of_match_ptr("buck2"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (300) * 1000,
> .desc.uV_step = (10) * 1000,
> @@ -668,12 +772,17 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK2_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK2_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK2_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK2_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK2_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9062_ID_BUCK3,
> .desc.name = "DA9062 BUCK3",
> .desc.of_match = of_match_ptr("buck3"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (800) * 1000,
> .desc.uV_step = (20) * 1000,
> @@ -704,12 +813,17 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK3_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK3_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK3_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK3_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK3_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9062_ID_BUCK4,
> .desc.name = "DA9062 BUCK4",
> .desc.of_match = of_match_ptr("buck4"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_buck_ops,
> .desc.min_uV = (530) * 1000,
> .desc.uV_step = (10) * 1000,
> @@ -740,12 +854,17 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_BUCK4_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_BUCK4_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_BUCK4_CONT,
> + __builtin_ffs((int)DA9062AA_VBUCK4_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VBUCK4_GPI_MASK) - 1),
> },
> {
> .desc.id = DA9062_ID_LDO1,
> .desc.name = "DA9062 LDO1",
> .desc.of_match = of_match_ptr("ldo1"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -769,6 +888,10 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO1_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO1_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO1_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO1_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO1_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO1_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -779,6 +902,7 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> .desc.name = "DA9062 LDO2",
> .desc.of_match = of_match_ptr("ldo2"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -802,6 +926,10 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO2_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO2_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO2_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO2_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO2_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO2_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -812,6 +940,7 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> .desc.name = "DA9062 LDO3",
> .desc.of_match = of_match_ptr("ldo3"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -835,6 +964,10 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO3_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO3_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO3_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO3_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO3_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO3_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -845,6 +978,7 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> .desc.name = "DA9062 LDO4",
> .desc.of_match = of_match_ptr("ldo4"),
> .desc.regulators_node = of_match_ptr("regulators"),
> + .desc.of_parse_cb = da9062_parse_dt,
> .desc.ops = &da9062_ldo_ops,
> .desc.min_uV = (900) * 1000,
> .desc.uV_step = (50) * 1000,
> @@ -868,6 +1002,10 @@ static const struct da9062_regulator_info
> local_da9062_regulator_info[] = {
> __builtin_ffs((int)DA9062AA_LDO4_CONF_MASK) - 1,
> sizeof(unsigned int) * 8 -
> __builtin_clz(DA9062AA_LDO4_CONF_MASK) - 1),
> + .vsel_gpi = REG_FIELD(DA9062AA_LDO4_CONT,
> + __builtin_ffs((int)DA9062AA_VLDO4_GPI_MASK) - 1,
> + sizeof(unsigned int) * 8 -
> + __builtin_clz(DA9062AA_VLDO4_GPI_MASK) - 1),
> .oc_event = REG_FIELD(DA9062AA_STATUS_D,
> __builtin_ffs((int)DA9062AA_LDO4_ILIM_MASK) - 1,
> sizeof(unsigned int) * 8 -
> @@ -988,6 +1126,15 @@ static int da9062_regulator_probe(struct
> platform_device *pdev)
> return PTR_ERR(regl->suspend_sleep);
> }
>
> + if (regl->info->vsel_gpi.reg) {
> + regl->vsel_gpi = devm_regmap_field_alloc(
> + &pdev->dev,
> + chip->regmap,
> + regl->info->vsel_gpi);
> + if (IS_ERR(regl->vsel_gpi))
> + return PTR_ERR(regl->vsel_gpi);
> + }
> +
> /* Register regulator */
> memset(&config, 0, sizeof(config));
> config.dev = chip->dev;
> @@ -997,6 +1144,8 @@ static int da9062_regulator_probe(struct
> platform_device *pdev)
> regl->rdev = devm_regulator_register(&pdev->dev, &regl->desc,
> &config);
> if (IS_ERR(regl->rdev)) {
> + if (PTR_ERR(regl->rdev) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> dev_err(&pdev->dev,
> "Failed to register %s regulator\n",
> regl->desc.name);
> --
> 2.20.1