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>
---
Changelog:
v3:
- make use of <linux/gpio/private.h>
- add comment to vsel_gpi
- append vsel_gpi to da9062_regulator_info instead of insert it in the
middle
v2:
- use new public api gpiod_to_offset()
- add -ENOENT error check to mimic devm_gpio_optional
- add local gpio check for hardening the code
---
drivers/regulator/da9062-regulator.c | 174 +++++++++++++++++++++++++++
1 file changed, 174 insertions(+)
diff --git a/drivers/regulator/da9062-regulator.c b/drivers/regulator/da9062-regulator.c
index 710e67081d53..6117e631236b 100644
--- a/drivers/regulator/da9062-regulator.c
+++ b/drivers/regulator/da9062-regulator.c
@@ -7,6 +7,8 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/private.h> /* for gpiod_to_offset() */
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -52,6 +54,16 @@ struct da9062_regulator_info {
unsigned int suspend_vsel_reg;
/* Event detection bit */
struct reg_field oc_event;
+ /*
+ * The DA9062 can use its own general purpose inputs to control the
+ * regulators. Each regulator can be configured independently. So the
+ * DA9062 is a consumer of its own provided general purpose inputs.
+ *
+ * vsel_gpi:
+ * The input port which is used by a regulator to select between
+ * voltage-a/b settings.
+ */
+ struct reg_field vsel_gpi;
};
/* Single regulator settings */
@@ -65,6 +77,7 @@ 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 +364,81 @@ 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 device *hw = regl->hw->dev;
+ struct device_node *gpio_np;
+ 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;
+ }
+
+ /*
+ * 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 remove action. The gpio's are
+ * optional so we need to check for ENOENT. Also we need to check for
+ * the GPIOLIB support. Do nothing if the property or the gpiolib is
+ * missing.
+ */
+ 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);
+ if (ret == -ENOENT || ret == -ENOSYS)
+ ret = 0;
+ goto free;
+ }
+
+ /*
+ * Only local gpios are valid. The gpio-controller is within the
+ * mfd-root node.
+ */
+ gpio_np = of_parse_phandle(np, prop, 0);
+ if (gpio_np != hw->of_node) {
+ of_node_put(gpio_np);
+ dev_err(hw, "Failed to request %s.\n", prop);
+ ret = -EINVAL;
+ goto free;
+ }
+ of_node_put(gpio_np);
+
+ /* We need the local number */
+ nr = gpiod_to_offset(gpi);
+ if (nr < 1 || nr > 3) {
+ ret = -EINVAL;
+ goto free;
+ }
+
+ ret = regmap_field_write(regl->vsel_gpi, nr);
+
+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 +446,7 @@ 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 +477,17 @@ 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 +518,17 @@ 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 +559,17 @@ 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 +593,10 @@ 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 +607,7 @@ 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 +631,10 @@ 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 +645,7 @@ 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 +669,10 @@ 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 +683,7 @@ 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 +707,10 @@ 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 +725,7 @@ 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 +756,17 @@ 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 +797,17 @@ 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 +838,17 @@ 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 +879,17 @@ 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 +913,10 @@ 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 +927,7 @@ 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 +951,10 @@ 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 +965,7 @@ 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 +989,10 @@ 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 +1003,7 @@ 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 +1027,10 @@ 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 +1151,15 @@ 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 +1169,8 @@ static int da9062_regulator_probe(struct platform_device *pdev)
regl->rdev = devm_regulator_register(&pdev->dev, ®l->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
[PATCH v3 4/6] regulator: da9062: add voltage selection gpio support
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
- Subject: [PATCH v3 4/6] regulator: da9062: add voltage selection gpio support
- From: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
- Date: Fri, 29 Nov 2019 18:25:35 +0100
- In-reply-to: <20191129172537.31410-1-m.felsch@pengutronix.de>
- References: <20191129172537.31410-1-m.felsch@pengutronix.de>
- References:
- [PATCH v3 0/6] DA9062 PMIC features
- From: Marco Felsch
- [PATCH v3 0/6] DA9062 PMIC features
- Prev by Date: [PATCH v3 1/6] gpio: treewide rename gpio_chip_hwgpio to gpiod_to_offset
- Next by Date: [PATCH v3 5/6] dt-bindings: mfd: da9062: add regulator gpio enable/disable documentation
- Previous by thread: Re: [PATCH v3 1/6] gpio: treewide rename gpio_chip_hwgpio to gpiod_to_offset
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