From: "Nuno Sá via B4 Relay" <devnull+nuno.sa.analog.com@kernel.org>
To: linux-gpio@vger.kernel.org, linux-pwm@vger.kernel.org,
devicetree@vger.kernel.org, linux-input@vger.kernel.org
Cc: "Lee Jones" <lee@kernel.org>, "Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Uwe Kleine-König" <ukleinek@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Bartosz Golaszewski" <brgl@bgdev.pl>,
"Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
"Liu Ying" <victor.liu@nxp.com>
Subject: [PATCH 06/18] mfd: adp5585: add support for adp5589
Date: Thu, 13 Mar 2025 14:19:23 +0000 [thread overview]
Message-ID: <20250313-dev-adp5589-fw-v1-6-20e80d4bd4ea@analog.com> (raw)
In-Reply-To: <20250313-dev-adp5589-fw-v1-0-20e80d4bd4ea@analog.com>
From: Nuno Sá <nuno.sa@analog.com>
The ADP5589 is a 19 I/O port expander with built-in keypad matrix decoder,
programmable logic, reset generator, and PWM generator.
This patch adds the foundation to add support for the adp5589 gpio and pwm
drivers. Most importantly, we need to differentiate between some
registers addresses. It also hints to future keymap support.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
drivers/mfd/adp5585.c | 215 ++++++++++++++++++++++++++++++++++++++++++--
include/linux/mfd/adp5585.h | 57 +++++++++++-
2 files changed, 264 insertions(+), 8 deletions(-)
diff --git a/drivers/mfd/adp5585.c b/drivers/mfd/adp5585.c
index fafe3ad93ea196e1eb8e79fecba58f36f12167eb..2fedc1c7cd08a7b3a8c7188d3e7cdfdf3122a214 100644
--- a/drivers/mfd/adp5585.c
+++ b/drivers/mfd/adp5585.c
@@ -25,6 +25,13 @@ static const struct mfd_cell adp5585_devs[] = {
};
+static const struct mfd_cell adp5589_devs[] = {
+ MFD_CELL_NAME("adp5589-keys"),
+ MFD_CELL_NAME("adp5589-gpio"),
+ MFD_CELL_NAME("adp5589-pwm"),
+
+};
+
static const struct regmap_range adp5585_volatile_ranges[] = {
regmap_reg_range(ADP5585_ID, ADP5585_GPI_STATUS_B),
};
@@ -34,6 +41,15 @@ static const struct regmap_access_table adp5585_volatile_regs = {
.n_yes_ranges = ARRAY_SIZE(adp5585_volatile_ranges),
};
+static const struct regmap_range adp5589_volatile_ranges[] = {
+ regmap_reg_range(ADP5585_ID, ADP5589_GPI_STATUS_C),
+};
+
+static const struct regmap_access_table adp5589_volatile_regs = {
+ .yes_ranges = adp5589_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(adp5589_volatile_ranges),
+};
+
/*
* Chip variants differ in the default configuration of pull-up and pull-down
* resistors, and therefore have different default register values:
@@ -77,10 +93,52 @@ static const u8 adp5585_regmap_defaults_04[ADP5585_MAX_REG + 1] = {
/* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00,
};
+static const u8 adp5589_regmap_defaults_00[ADP5589_MAX_REG + 1] = {
+ /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x18 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x48 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static const u8 adp5589_regmap_defaults_01[ADP5589_MAX_REG + 1] = {
+ /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x18 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00,
+ /* 0x40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x48 */ 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00,
+};
+
+static const u8 adp5589_regmap_defaults_02[ADP5589_MAX_REG + 1] = {
+ /* 0x00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x18 */ 0x00, 0x41, 0x01, 0x00, 0x11, 0x04, 0x00, 0x00,
+ /* 0x20 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x28 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* 0x48 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
enum adp5585_regmap_type {
ADP5585_REGMAP_00,
ADP5585_REGMAP_02,
ADP5585_REGMAP_04,
+ ADP5589_REGMAP_00,
+ ADP5589_REGMAP_01,
+ ADP5589_REGMAP_02,
};
static const struct regmap_config adp5585_regmap_configs[] = {
@@ -111,6 +169,131 @@ static const struct regmap_config adp5585_regmap_configs[] = {
.reg_defaults_raw = adp5585_regmap_defaults_04,
.num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_04),
},
+ [ADP5589_REGMAP_00] = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = ADP5589_MAX_REG,
+ .volatile_table = &adp5585_volatile_regs,
+ .cache_type = REGCACHE_MAPLE,
+ .reg_defaults_raw = adp5589_regmap_defaults_00,
+ .num_reg_defaults_raw = sizeof(adp5589_regmap_defaults_00),
+ },
+ [ADP5589_REGMAP_01] = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = ADP5589_MAX_REG,
+ .volatile_table = &adp5585_volatile_regs,
+ .cache_type = REGCACHE_MAPLE,
+ .reg_defaults_raw = adp5589_regmap_defaults_01,
+ .num_reg_defaults_raw = sizeof(adp5589_regmap_defaults_01),
+ },
+ [ADP5589_REGMAP_02] = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = ADP5589_MAX_REG,
+ .volatile_table = &adp5585_volatile_regs,
+ .cache_type = REGCACHE_MAPLE,
+ .reg_defaults_raw = adp5589_regmap_defaults_02,
+ .num_reg_defaults_raw = sizeof(adp5589_regmap_defaults_02),
+ },
+};
+
+static const struct adp5585_regs adp5585_regs = {
+ .debounce_dis_a = ADP5585_DEBOUNCE_DIS_A,
+ .rpull_cfg_a = ADP5585_RPULL_CONFIG_A,
+ .gpo_data_a = ADP5585_GPO_DATA_OUT_A,
+ .gpo_out_a = ADP5585_GPO_OUT_MODE_A,
+ .gpio_dir_a = ADP5585_GPIO_DIRECTION_A,
+ .gpi_stat_a = ADP5585_GPI_STATUS_A,
+ .pwm_cfg = ADP5585_PWM_CFG,
+ .pwm_offt_low = ADP5585_PWM_OFFT_LOW,
+ .pwm_ont_low = ADP5585_PWM_ONT_LOW,
+ .gen_cfg = ADP5585_GENERAL_CFG,
+ .ext_cfg = ADP5585_PIN_CONFIG_C,
+};
+
+static const struct adp5585_regs adp5589_regs = {
+ .debounce_dis_a = ADP5589_DEBOUNCE_DIS_A,
+ .rpull_cfg_a = ADP5589_RPULL_CONFIG_A,
+ .gpo_data_a = ADP5589_GPO_DATA_OUT_A,
+ .gpo_out_a = ADP5589_GPO_OUT_MODE_A,
+ .gpio_dir_a = ADP5589_GPIO_DIRECTION_A,
+ .gpi_stat_a = ADP5589_GPI_STATUS_A,
+ .pwm_cfg = ADP5589_PWM_CFG,
+ .pwm_offt_low = ADP5589_PWM_OFFT_LOW,
+ .pwm_ont_low = ADP5589_PWM_ONT_LOW,
+ .gen_cfg = ADP5589_GENERAL_CFG,
+ .ext_cfg = ADP5589_PIN_CONFIG_D,
+};
+
+static const struct adp5585_info adp5585_info = {
+ .adp5585_devs = adp5585_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5585_REGMAP_00],
+ .n_devs = ARRAY_SIZE(adp5585_devs),
+ .id = ADP5585_MAN_ID_VALUE,
+ .regs = &adp5585_regs,
+ .max_rows = ADP5585_MAX_ROW_NUM,
+ .max_cols = ADP5585_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5585_01_info = {
+ .adp5585_devs = adp5585_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5585_REGMAP_00],
+ .n_devs = ARRAY_SIZE(adp5585_devs),
+ .id = ADP5585_MAN_ID_VALUE,
+ .regs = &adp5585_regs,
+ .max_rows = ADP5585_MAX_ROW_NUM,
+ .max_cols = ADP5585_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5585_02_info = {
+ .adp5585_devs = adp5585_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5585_REGMAP_02],
+ .n_devs = ARRAY_SIZE(adp5585_devs),
+ .id = ADP5585_MAN_ID_VALUE,
+ .regs = &adp5585_regs,
+ .max_rows = ADP5585_MAX_ROW_NUM,
+ .max_cols = ADP5585_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5585_04_info = {
+ .adp5585_devs = adp5585_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5585_REGMAP_04],
+ .n_devs = ARRAY_SIZE(adp5585_devs),
+ .id = ADP5585_MAN_ID_VALUE,
+ .regs = &adp5585_regs,
+ .max_rows = ADP5585_MAX_ROW_NUM,
+ .max_cols = ADP5585_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5589_info = {
+ .adp5585_devs = adp5589_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5589_REGMAP_00],
+ .n_devs = ARRAY_SIZE(adp5589_devs),
+ .id = ADP5589_MAN_ID_VALUE,
+ .regs = &adp5589_regs,
+ .max_rows = ADP5589_MAX_ROW_NUM,
+ .max_cols = ADP5589_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5589_01_info = {
+ .adp5585_devs = adp5589_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5589_REGMAP_01],
+ .n_devs = ARRAY_SIZE(adp5589_devs),
+ .id = ADP5589_MAN_ID_VALUE,
+ .regs = &adp5589_regs,
+ .max_rows = ADP5589_MAX_ROW_NUM,
+ .max_cols = ADP5589_MAX_COL_NUM,
+};
+
+static const struct adp5585_info adp5589_02_info = {
+ .adp5585_devs = adp5589_devs,
+ .regmap_config = &adp5585_regmap_configs[ADP5589_REGMAP_02],
+ .n_devs = ARRAY_SIZE(adp5589_devs),
+ .id = ADP5589_MAN_ID_VALUE,
+ .regs = &adp5589_regs,
+ .max_rows = ADP5589_MAX_ROW_NUM,
+ .max_cols = ADP5589_MAX_COL_NUM,
};
static void adp5585_osc_disable(void *data)
@@ -122,7 +305,7 @@ static void adp5585_osc_disable(void *data)
static int adp5585_i2c_probe(struct i2c_client *i2c)
{
- const struct regmap_config *regmap_config;
+ const struct adp5585_info *info;
struct adp5585_dev *adp5585;
unsigned int id;
int ret;
@@ -133,8 +316,13 @@ static int adp5585_i2c_probe(struct i2c_client *i2c)
i2c_set_clientdata(i2c, adp5585);
- regmap_config = i2c_get_match_data(i2c);
- adp5585->regmap = devm_regmap_init_i2c(i2c, regmap_config);
+ info = i2c_get_match_data(i2c);
+ if (!info)
+ return -ENODEV;
+
+ adp5585->info = info;
+
+ adp5585->regmap = devm_regmap_init_i2c(i2c, info->regmap_config);
if (IS_ERR(adp5585->regmap))
return dev_err_probe(&i2c->dev, PTR_ERR(adp5585->regmap),
"Failed to initialize register map\n");
@@ -144,7 +332,8 @@ static int adp5585_i2c_probe(struct i2c_client *i2c)
return dev_err_probe(&i2c->dev, ret,
"Failed to read device ID\n");
- if ((id & ADP5585_MAN_ID_MASK) != ADP5585_MAN_ID_VALUE)
+ id &= ADP5585_MAN_ID_MASK;
+ if (id != adp5585->info->id)
return dev_err_probe(&i2c->dev, -ENODEV,
"Invalid device ID 0x%02x\n", id);
@@ -158,8 +347,8 @@ static int adp5585_i2c_probe(struct i2c_client *i2c)
return ret;
ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
- adp5585_devs, ARRAY_SIZE(adp5585_devs),
- NULL, 0, NULL);
+ adp5585->info->adp5585_devs,
+ adp5585->info->n_devs, NULL, 0, NULL);
if (ret)
return dev_err_probe(&i2c->dev, ret,
"Failed to add child devices\n");
@@ -203,7 +392,19 @@ static const struct of_device_id adp5585_of_match[] = {
.data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
}, {
.compatible = "adi,adp5585-04",
- .data = &adp5585_regmap_configs[ADP5585_REGMAP_04],
+ .data = &adp5585_04_info,
+ }, {
+ .compatible = "adi,adp5589-00",
+ .data = &adp5589_info,
+ }, {
+ .compatible = "adi,adp5589-01",
+ .data = &adp5589_01_info,
+ }, {
+ .compatible = "adi,adp5589-02",
+ .data = &adp5589_02_info,
+ }, {
+ .compatible = "adi,adp5589",
+ .data = &adp5589_info,
},
{ /* sentinel */ }
};
diff --git a/include/linux/mfd/adp5585.h b/include/linux/mfd/adp5585.h
index 016033cd68e46757aca86d21dd37025fd354b801..dffe1449de01dacf8fe78cf0e87d1f176d11f620 100644
--- a/include/linux/mfd/adp5585.h
+++ b/include/linux/mfd/adp5585.h
@@ -104,9 +104,11 @@
#define ADP5585_INT_CFG BIT(1)
#define ADP5585_RST_CFG BIT(0)
#define ADP5585_INT_EN 0x3c
-
#define ADP5585_MAX_REG ADP5585_INT_EN
+#define ADP5585_MAX_ROW_NUM 6
+#define ADP5585_MAX_COL_NUM 5
+
/*
* Bank 0 covers pins "GPIO 1/R0" to "GPIO 6/R5", numbered 0 to 5 by the
* driver, and bank 1 covers pins "GPIO 7/C0" to "GPIO 11/C4", numbered 6 to
@@ -117,10 +119,63 @@
#define ADP5585_BANK(n) ((n) >= 6 ? 1 : 0)
#define ADP5585_BIT(n) ((n) >= 6 ? BIT((n) - 6) : BIT(n))
+/* ADP5589 */
+#define ADP5589_MAN_ID_VALUE 0x10
+#define ADP5589_GPI_STATUS_A 0x16
+#define ADP5589_GPI_STATUS_C 0x18
+#define ADP5589_RPULL_CONFIG_A 0x19
+#define ADP5589_DEBOUNCE_DIS_A 0x27
+#define ADP5589_GPO_DATA_OUT_A 0x2a
+#define ADP5589_GPO_OUT_MODE_A 0x2d
+#define ADP5589_GPIO_DIRECTION_A 0x30
+#define ADP5589_PWM_OFFT_LOW 0x3e
+#define ADP5589_PWM_ONT_LOW 0x40
+#define ADP5589_PWM_CFG 0x42
+#define ADP5589_PIN_CONFIG_D 0x4C
+#define ADP5589_GENERAL_CFG 0x4d
+#define ADP5589_INT_EN 0x4e
+#define ADP5589_MAX_REG ADP5589_INT_EN
+
+#define ADP5589_MAX_ROW_NUM 8
+#define ADP5589_MAX_COL_NUM 11
+
+/*
+ * Bank 0 covers pins "GPIO 1/R0" to "GPIO 8/R7", numbered 0 to 7 by the
+ * driver, bank 1 covers pins "GPIO 9/C0" to "GPIO 16/C7", numbered 8 to
+ * 15 and bank 3 covers pins "GPIO 17/C8" to "GPIO 19/C10", numbered 16 to 18.
+ */
+#define ADP5589_BANK(n) ((n) >> 3)
+#define ADP5589_BIT(n) BIT((n) & 0x7)
+
+struct adp5585_regs {
+ unsigned int debounce_dis_a;
+ unsigned int rpull_cfg_a;
+ unsigned int gpo_data_a;
+ unsigned int gpo_out_a;
+ unsigned int gpio_dir_a;
+ unsigned int gpi_stat_a;
+ unsigned int pwm_cfg;
+ unsigned int pwm_offt_low;
+ unsigned int pwm_ont_low;
+ unsigned int gen_cfg;
+ unsigned int ext_cfg;
+};
+
+struct adp5585_info {
+ const struct mfd_cell *adp5585_devs;
+ const struct regmap_config *regmap_config;
+ const struct adp5585_regs *regs;
+ unsigned int n_devs;
+ unsigned int id;
+ u8 max_rows;
+ u8 max_cols;
+};
+
struct regmap;
struct adp5585_dev {
struct regmap *regmap;
+ const struct adp5585_info *info;
};
#endif
--
2.48.1
next prev parent reply other threads:[~2025-03-13 14:19 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-13 14:19 [PATCH 00/18] mfd: adp5585: support keymap events and drop legacy Input driver Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 01/18] dt-bindings: mfd: adp5585: ease on the required properties Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 02/18] mfd: adp5585: enable oscilator during probe Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 03/18] pwm: adp5585: don't control OSC_EN in the pwm driver Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 04/18] mfd: adp5585: make use of MFD_CELL_NAME() Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 05/18] dt-bindings: mfd: adp5585: document adp5589 I/O expander Nuno Sá via B4 Relay
2025-03-14 8:49 ` Krzysztof Kozlowski
2025-03-14 9:38 ` Nuno Sá
2025-03-17 7:41 ` Krzysztof Kozlowski
2025-03-17 9:30 ` Nuno Sá
2025-03-17 10:41 ` Krzysztof Kozlowski
2025-03-13 14:19 ` Nuno Sá via B4 Relay [this message]
2025-03-14 9:12 ` [PATCH 06/18] mfd: adp5585: add support for adp5589 kernel test robot
2025-03-14 9:23 ` kernel test robot
2025-03-14 9:32 ` Nuno Sá
2025-03-13 14:19 ` [PATCH 07/18] gpio: adp5585: add support for the ad5589 expander Nuno Sá via B4 Relay
2025-03-14 10:53 ` Linus Walleij
2025-03-13 14:19 ` [PATCH 08/18] pwm: adp5585: add support for adp5589 Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 09/18] dt-bindings: mfd: adp5585: add properties for input events Nuno Sá via B4 Relay
2025-03-17 15:53 ` Rob Herring
2025-03-17 16:08 ` Nuno Sá
2025-03-13 14:19 ` [PATCH 10/18] mfd: adp5585: add support for key events Nuno Sá via B4 Relay
2025-03-14 9:43 ` kernel test robot
2025-03-13 14:19 ` [PATCH 11/18] gpio: adp5585: support gpi events Nuno Sá via B4 Relay
2025-03-14 10:54 ` Linus Walleij
2025-03-13 14:19 ` [PATCH 12/18] Input: adp5585: Add Analog Devices ADP5585/89 support Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 13/18] Input: adp5589: remove the driver Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 14/18] mfd: adp5585: support getting vdd regulator Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 15/18] dt-bindings: mfd: adp5585: document reset gpio Nuno Sá via B4 Relay
2025-03-14 8:52 ` Krzysztof Kozlowski
2025-03-13 14:19 ` [PATCH 16/18] mfd: adp5585: add support for a reset pin Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 17/18] pwm: adp5585: make sure to include mod_devicetable.h Nuno Sá via B4 Relay
2025-03-13 14:19 ` [PATCH 18/18] gpio: " Nuno Sá via B4 Relay
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