Changes in v5:
- andy.shevchenko review:
- Use ENOTSUPP instead of EOPNOTSUPP.
- Nits:
- Use Datasheet tag in commit message and cover.
- Indentation, use 80 column width for Kconfig and 100
colums for C files.
- Format comment.
- Link to v4: https://lore.kernel.org/r/20230511-tps65219-add-gpio-support-v4-0-b5d6a764d722@baylibre.com
GPIO interface consist in 3 pins:
Two GPIOS are output only: GPO1, GPO2.
GPIO0 is used for multi device support:
- The input-functionality is only used in multi-PMIC configuration
- In single-PMIC, it can be used as an output
The configuration is static and flashed in NVM in factory.
Description tps65219.pdf chapter 7.3.13
Linux must not change MULTI_DEVICE_ENABLE bit at run time.
This was done for test purpose only to check input/output
correct behavior on EVM board (no access to different NVM config).
Tested on k3-am62x-lp-sk board. This board MULTI_DEVICE_ENABLE=0
Despite the register bits are out of order,
driver is remapping in natural order:
GPIO0 is gpiochip line 0
GPO1/2 are gpiochip line 1/2
Initial version by Jon Cormier on TI Mainline.
Ported upstream by Jerome Neanne
Changes in v4:
- andy.shevchenko review:
- Nits:
- move blank line before link in this cover.
- Kconfig indentation.
- Formatting: Comments; indentation; line length 100.
- Do not split string literals.
- Add var *dev = gpio->tps->dev and replace to get shorter blocks.
- Evaluate GPIO0 MULTI_DEVICE_ENABLE only once.
- Explicit include of bits.h
Change to CONFIG_DEBUG_GPIO: debug options from Kconfig for GPIO only.
- Link to v3: https://lore.kernel.org/r/20230511-tps65219-add-gpio-support-v3-0-19837a34d820@baylibre.com
Changes in v3:
- Linus Walleij Review:
- put test code under IS_ENABLED(DEBUG)
- Bartosz Golaszewski Review:
- nits: alphabetical ordering for includes, newline after
return,
- Add error message on regmap_update_bits failure.
- Change variable name in: tps65219_template_chip so that it's
clear that gpio_chip get's a copy of this template structure.
- Link to v2: https://lore.kernel.org/r/20230511-tps65219-add-gpio-support-v2-0-60feb64d649a@baylibre.com
Changes in v2:
andy.shevchenko review:
- Typo and indentation in commit message.
- Clarify Co-developer role.
- Specify name for module.
- Code simplification for tps65219_gpio_set
- Put test code into #if 0 ... #endif to make it easier to re-use
- Formatting for .driver
- remove dupplicated error management => dead code
- Link to v1: https://lore.kernel.org/all/[email protected]/
Datasheet: https://www.ti.com/lit/ds/symlink/tps65219.pdf
Co-developed-by: Jonathan Cormier <[email protected]>
Signed-off-by: Jonathan Cormier <[email protected]>
Signed-off-by: Jerome Neanne <[email protected]>
Jerome Neanne (2):
gpio: tps65219: add GPIO support for TPS65219 PMIC
mfd: tps65219: Add gpio cell instance
MAINTAINERS | 1 +
drivers/gpio/Kconfig | 13 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-tps65219.c | 167 +++++++++++++++++++++++++++++++++++
drivers/mfd/tps65219.c | 7 +-
5 files changed, 188 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpio/gpio-tps65219.c
--
2.34.1
---
Jerome Neanne (2):
gpio: tps65219: add GPIO support for TPS65219 PMIC
mfd: tps65219: Add gpio cell instance
MAINTAINERS | 1 +
drivers/gpio/Kconfig | 16 ++++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-tps65219.c | 185 +++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/tps65219.c | 2 +-
5 files changed, 204 insertions(+), 1 deletion(-)
---
base-commit: 8ded96e4d9a6da88bdbad61350cc6147b7c0c00c
change-id: 20230511-tps65219-add-gpio-support-322bdb4e0297
Best regards,
--
Jerome Neanne <[email protected]>
Add support for TPS65219 PMICs GPIO interface.
3 GPIO pins:
- GPIO0 only is IO but input mode reserved for MULTI_DEVICE_ENABLE usage.
- GPIO1 and GPIO2 are Output only and referred as GPO1 and GPO2 in spec.
GPIO0 is statically configured as input or output prior to Linux boot.
it is used for MULTI_DEVICE_ENABLE function.
This setting is statically configured by NVM.
GPIO0 can't be used as a generic GPIO (specification Table 8-34).
It's either a GPO when MULTI_DEVICE_EN=0 or a GPI when MULTI_DEVICE_EN=1.
Datasheet describes specific usage for non standard GPIO.
Datasheet: https://www.ti.com/lit/ds/symlink/tps65219.pdf
Co-developed-by: Jonathan Cormier <[email protected]>
Signed-off-by: Jonathan Cormier <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Jerome Neanne <[email protected]>
---
MAINTAINERS | 1 +
drivers/gpio/Kconfig | 16 ++++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-tps65219.c | 185 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 203 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index c0cde28c62c6..d912b7465e84 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15398,6 +15398,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git
F: arch/arm/configs/omap2plus_defconfig
F: arch/arm/mach-omap2/
F: drivers/bus/ti-sysc.c
+F: drivers/gpio/gpio-tps65219.c
F: drivers/i2c/busses/i2c-omap.c
F: drivers/irqchip/irq-omap-intc.c
F: drivers/mfd/*omap*.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5521f060d58e..047af064335d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1440,6 +1440,22 @@ config GPIO_TPS65218
Select this option to enable GPIO driver for the TPS65218
chip family.
+config GPIO_TPS65219
+ tristate "TPS65219 GPIO"
+ depends on MFD_TPS65219
+ default MFD_TPS65219
+ help
+ Select this option to enable GPIO driver for the TPS65219 chip
+ family.
+ GPIO0 is statically configured as either input or output prior to
+ Linux boot. It is used for MULTI_DEVICE_ENABLE function. This setting
+ is statically configured by NVM. GPIO0 can't be used as a generic
+ GPIO. It's either a GPO when MULTI_DEVICE_EN=0 or a GPI when
+ MULTI_DEVICE_EN=1.
+
+ This driver can also be built as a module. If so, the module will be
+ called gpio_tps65219.
+
config GPIO_TPS6586X
bool "TPS6586X GPIO"
depends on MFD_TPS6586X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 20036af3acb1..7843b16f5d59 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_GPIO_TN48M_CPLD) += gpio-tn48m.o
obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o
obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
+obj-$(CONFIG_GPIO_TPS65219) += gpio-tps65219.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
diff --git a/drivers/gpio/gpio-tps65219.c b/drivers/gpio/gpio-tps65219.c
new file mode 100644
index 000000000000..7b38aa360112
--- /dev/null
+++ b/drivers/gpio/gpio-tps65219.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPIO driver for TI TPS65219 PMICs
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/bits.h>
+#include <linux/gpio/driver.h>
+#include <linux/mfd/tps65219.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define TPS65219_GPIO0_DIR_MASK BIT(3)
+#define TPS65219_GPIO0_OFFSET 2
+#define TPS65219_GPIO0_IDX 0
+#define TPS65219_GPIO_DIR_IN 1
+#define TPS65219_GPIO_DIR_OUT 0
+
+struct tps65219_gpio {
+ struct gpio_chip gpio_chip;
+ struct tps65219 *tps;
+};
+
+static int tps65219_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct tps65219_gpio *gpio = gpiochip_get_data(gc);
+ int ret, val;
+
+ if (offset != TPS65219_GPIO0_IDX)
+ return GPIO_LINE_DIRECTION_OUT;
+
+ ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG, &val);
+ if (ret)
+ return ret;
+
+ return !!(val & TPS65219_GPIO0_DIR_MASK);
+}
+
+static int tps65219_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct tps65219_gpio *gpio = gpiochip_get_data(gc);
+ struct device *dev = gpio->tps->dev;
+ int ret, val;
+
+ if (offset != TPS65219_GPIO0_IDX) {
+ dev_err(dev, "GPIO%d is output only, cannot get\n", offset);
+ return -ENOTSUPP;
+ }
+
+ ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_CTRL, &val);
+ if (ret)
+ return ret;
+
+ ret = !!(val & BIT(TPS65219_MFP_GPIO_STATUS_MASK));
+ dev_warn(dev, "GPIO%d = %d, MULTI_DEVICE_ENABLE, not a standard GPIO\n", offset, ret);
+
+ /*
+ * Depending on NVM config, return an error if direction is output, otherwise the GPIO0
+ * status bit.
+ */
+
+ if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
+ return -ENOTSUPP;
+
+ return ret;
+}
+
+static void tps65219_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ struct tps65219_gpio *gpio = gpiochip_get_data(gc);
+ struct device *dev = gpio->tps->dev;
+ int v, mask, bit;
+
+ bit = (offset == TPS65219_GPIO0_IDX) ? TPS65219_GPIO0_OFFSET : offset - 1;
+
+ mask = BIT(bit);
+ v = value ? mask : 0;
+
+ if (regmap_update_bits(gpio->tps->regmap, TPS65219_REG_GENERAL_CONFIG, mask, v))
+ dev_err(dev, "GPIO%d, set to value %d failed.\n", offset, value);
+}
+
+static int tps65219_gpio_change_direction(struct gpio_chip *gc, unsigned int offset,
+ unsigned int direction)
+{
+ struct tps65219_gpio *gpio = gpiochip_get_data(gc);
+ struct device *dev = gpio->tps->dev;
+
+ /*
+ * Documentation is stating that GPIO0 direction must not be changed in Linux:
+ * Table 8-34. MFP_1_CONFIG(3): MULTI_DEVICE_ENABLE, should only be changed in INITIALIZE
+ * state (prior to ON Request).
+ * Set statically by NVM, changing direction in application can cause a hang.
+ * Below can be used for test purpose only.
+ */
+
+ if (IS_ENABLED(CONFIG_DEBUG_GPIO)) {
+ int ret = regmap_update_bits(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG,
+ TPS65219_GPIO0_DIR_MASK, direction);
+ if (ret) {
+ dev_err(dev,
+ "GPIO DEBUG enabled: Fail to change direction to %u for GPIO%d.\n",
+ direction, offset);
+ return ret;
+ }
+ }
+
+ dev_err(dev,
+ "GPIO%d direction set by NVM, change to %u failed, not allowed by specification\n",
+ offset, direction);
+
+ return -ENOTSUPP;
+}
+
+static int tps65219_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
+{
+ struct tps65219_gpio *gpio = gpiochip_get_data(gc);
+ struct device *dev = gpio->tps->dev;
+
+ if (offset != TPS65219_GPIO0_IDX) {
+ dev_err(dev, "GPIO%d is output only, cannot change to input\n", offset);
+ return -ENOTSUPP;
+ }
+
+ if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_IN)
+ return 0;
+
+ return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_IN);
+}
+
+static int tps65219_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value)
+{
+ tps65219_gpio_set(gc, offset, value);
+ if (offset != TPS65219_GPIO0_IDX)
+ return 0;
+
+ if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
+ return 0;
+
+ return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_OUT);
+}
+
+static const struct gpio_chip tps65219_template_chip = {
+ .label = "tps65219-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = tps65219_gpio_get_direction,
+ .direction_input = tps65219_gpio_direction_input,
+ .direction_output = tps65219_gpio_direction_output,
+ .get = tps65219_gpio_get,
+ .set = tps65219_gpio_set,
+ .base = -1,
+ .ngpio = 3,
+ .can_sleep = true,
+};
+
+static int tps65219_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
+ struct tps65219_gpio *gpio;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->tps = tps;
+ gpio->gpio_chip = tps65219_template_chip;
+ gpio->gpio_chip.parent = tps->dev;
+
+ return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
+}
+
+static struct platform_driver tps65219_gpio_driver = {
+ .driver = {
+ .name = "tps65219-gpio",
+ },
+ .probe = tps65219_gpio_probe,
+};
+module_platform_driver(tps65219_gpio_driver);
+
+MODULE_ALIAS("platform:tps65219-gpio");
+MODULE_AUTHOR("Jonathan Cormier <[email protected]>");
+MODULE_DESCRIPTION("TPS65219 GPIO driver");
+MODULE_LICENSE("GPL");
--
2.34.1
Wed, Jun 07, 2023 at 04:39:31PM +0200, Jerome Neanne kirjoitti:
> Add support for TPS65219 PMICs GPIO interface.
>
> 3 GPIO pins:
> - GPIO0 only is IO but input mode reserved for MULTI_DEVICE_ENABLE usage.
> - GPIO1 and GPIO2 are Output only and referred as GPO1 and GPO2 in spec.
>
> GPIO0 is statically configured as input or output prior to Linux boot.
> it is used for MULTI_DEVICE_ENABLE function.
> This setting is statically configured by NVM.
> GPIO0 can't be used as a generic GPIO (specification Table 8-34).
> It's either a GPO when MULTI_DEVICE_EN=0 or a GPI when MULTI_DEVICE_EN=1.
>
> Datasheet describes specific usage for non standard GPIO.
Reviewed-by: Andy Shevchenko <[email protected]>
I forgot if I asked about gpio-regmap use possibility, but it can be done
as a followup if seems valuable.
> Datasheet: https://www.ti.com/lit/ds/symlink/tps65219.pdf
> Co-developed-by: Jonathan Cormier <[email protected]>
> Signed-off-by: Jonathan Cormier <[email protected]>
> Reviewed-by: Linus Walleij <[email protected]>
> Signed-off-by: Jerome Neanne <[email protected]>
> ---
> MAINTAINERS | 1 +
> drivers/gpio/Kconfig | 16 ++++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-tps65219.c | 185 +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 203 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c0cde28c62c6..d912b7465e84 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15398,6 +15398,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git
> F: arch/arm/configs/omap2plus_defconfig
> F: arch/arm/mach-omap2/
> F: drivers/bus/ti-sysc.c
> +F: drivers/gpio/gpio-tps65219.c
> F: drivers/i2c/busses/i2c-omap.c
> F: drivers/irqchip/irq-omap-intc.c
> F: drivers/mfd/*omap*.c
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 5521f060d58e..047af064335d 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -1440,6 +1440,22 @@ config GPIO_TPS65218
> Select this option to enable GPIO driver for the TPS65218
> chip family.
>
> +config GPIO_TPS65219
> + tristate "TPS65219 GPIO"
> + depends on MFD_TPS65219
> + default MFD_TPS65219
> + help
> + Select this option to enable GPIO driver for the TPS65219 chip
> + family.
> + GPIO0 is statically configured as either input or output prior to
> + Linux boot. It is used for MULTI_DEVICE_ENABLE function. This setting
> + is statically configured by NVM. GPIO0 can't be used as a generic
> + GPIO. It's either a GPO when MULTI_DEVICE_EN=0 or a GPI when
> + MULTI_DEVICE_EN=1.
> +
> + This driver can also be built as a module. If so, the module will be
> + called gpio_tps65219.
> +
> config GPIO_TPS6586X
> bool "TPS6586X GPIO"
> depends on MFD_TPS6586X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 20036af3acb1..7843b16f5d59 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -160,6 +160,7 @@ obj-$(CONFIG_GPIO_TN48M_CPLD) += gpio-tn48m.o
> obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
> obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o
> obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
> +obj-$(CONFIG_GPIO_TPS65219) += gpio-tps65219.o
> obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
> obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
> obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
> diff --git a/drivers/gpio/gpio-tps65219.c b/drivers/gpio/gpio-tps65219.c
> new file mode 100644
> index 000000000000..7b38aa360112
> --- /dev/null
> +++ b/drivers/gpio/gpio-tps65219.c
> @@ -0,0 +1,185 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * GPIO driver for TI TPS65219 PMICs
> + *
> + * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/mfd/tps65219.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define TPS65219_GPIO0_DIR_MASK BIT(3)
> +#define TPS65219_GPIO0_OFFSET 2
> +#define TPS65219_GPIO0_IDX 0
> +#define TPS65219_GPIO_DIR_IN 1
> +#define TPS65219_GPIO_DIR_OUT 0
> +
> +struct tps65219_gpio {
> + struct gpio_chip gpio_chip;
> + struct tps65219 *tps;
> +};
> +
> +static int tps65219_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
> +{
> + struct tps65219_gpio *gpio = gpiochip_get_data(gc);
> + int ret, val;
> +
> + if (offset != TPS65219_GPIO0_IDX)
> + return GPIO_LINE_DIRECTION_OUT;
> +
> + ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG, &val);
> + if (ret)
> + return ret;
> +
> + return !!(val & TPS65219_GPIO0_DIR_MASK);
> +}
> +
> +static int tps65219_gpio_get(struct gpio_chip *gc, unsigned int offset)
> +{
> + struct tps65219_gpio *gpio = gpiochip_get_data(gc);
> + struct device *dev = gpio->tps->dev;
> + int ret, val;
> +
> + if (offset != TPS65219_GPIO0_IDX) {
> + dev_err(dev, "GPIO%d is output only, cannot get\n", offset);
> + return -ENOTSUPP;
> + }
> +
> + ret = regmap_read(gpio->tps->regmap, TPS65219_REG_MFP_CTRL, &val);
> + if (ret)
> + return ret;
> +
> + ret = !!(val & BIT(TPS65219_MFP_GPIO_STATUS_MASK));
> + dev_warn(dev, "GPIO%d = %d, MULTI_DEVICE_ENABLE, not a standard GPIO\n", offset, ret);
> +
> + /*
> + * Depending on NVM config, return an error if direction is output, otherwise the GPIO0
> + * status bit.
> + */
> +
> + if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
> + return -ENOTSUPP;
> +
> + return ret;
> +}
> +
> +static void tps65219_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
> +{
> + struct tps65219_gpio *gpio = gpiochip_get_data(gc);
> + struct device *dev = gpio->tps->dev;
> + int v, mask, bit;
> +
> + bit = (offset == TPS65219_GPIO0_IDX) ? TPS65219_GPIO0_OFFSET : offset - 1;
> +
> + mask = BIT(bit);
> + v = value ? mask : 0;
> +
> + if (regmap_update_bits(gpio->tps->regmap, TPS65219_REG_GENERAL_CONFIG, mask, v))
> + dev_err(dev, "GPIO%d, set to value %d failed.\n", offset, value);
> +}
> +
> +static int tps65219_gpio_change_direction(struct gpio_chip *gc, unsigned int offset,
> + unsigned int direction)
> +{
> + struct tps65219_gpio *gpio = gpiochip_get_data(gc);
> + struct device *dev = gpio->tps->dev;
> +
> + /*
> + * Documentation is stating that GPIO0 direction must not be changed in Linux:
> + * Table 8-34. MFP_1_CONFIG(3): MULTI_DEVICE_ENABLE, should only be changed in INITIALIZE
> + * state (prior to ON Request).
> + * Set statically by NVM, changing direction in application can cause a hang.
> + * Below can be used for test purpose only.
> + */
> +
> + if (IS_ENABLED(CONFIG_DEBUG_GPIO)) {
> + int ret = regmap_update_bits(gpio->tps->regmap, TPS65219_REG_MFP_1_CONFIG,
> + TPS65219_GPIO0_DIR_MASK, direction);
> + if (ret) {
> + dev_err(dev,
> + "GPIO DEBUG enabled: Fail to change direction to %u for GPIO%d.\n",
> + direction, offset);
> + return ret;
> + }
> + }
> +
> + dev_err(dev,
> + "GPIO%d direction set by NVM, change to %u failed, not allowed by specification\n",
> + offset, direction);
> +
> + return -ENOTSUPP;
> +}
> +
> +static int tps65219_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
> +{
> + struct tps65219_gpio *gpio = gpiochip_get_data(gc);
> + struct device *dev = gpio->tps->dev;
> +
> + if (offset != TPS65219_GPIO0_IDX) {
> + dev_err(dev, "GPIO%d is output only, cannot change to input\n", offset);
> + return -ENOTSUPP;
> + }
> +
> + if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_IN)
> + return 0;
> +
> + return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_IN);
> +}
> +
> +static int tps65219_gpio_direction_output(struct gpio_chip *gc, unsigned int offset, int value)
> +{
> + tps65219_gpio_set(gc, offset, value);
> + if (offset != TPS65219_GPIO0_IDX)
> + return 0;
> +
> + if (tps65219_gpio_get_direction(gc, offset) == TPS65219_GPIO_DIR_OUT)
> + return 0;
> +
> + return tps65219_gpio_change_direction(gc, offset, TPS65219_GPIO_DIR_OUT);
> +}
> +
> +static const struct gpio_chip tps65219_template_chip = {
> + .label = "tps65219-gpio",
> + .owner = THIS_MODULE,
> + .get_direction = tps65219_gpio_get_direction,
> + .direction_input = tps65219_gpio_direction_input,
> + .direction_output = tps65219_gpio_direction_output,
> + .get = tps65219_gpio_get,
> + .set = tps65219_gpio_set,
> + .base = -1,
> + .ngpio = 3,
> + .can_sleep = true,
> +};
> +
> +static int tps65219_gpio_probe(struct platform_device *pdev)
> +{
> + struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
> + struct tps65219_gpio *gpio;
> +
> + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> + if (!gpio)
> + return -ENOMEM;
> +
> + gpio->tps = tps;
> + gpio->gpio_chip = tps65219_template_chip;
> + gpio->gpio_chip.parent = tps->dev;
> +
> + return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
> +}
> +
> +static struct platform_driver tps65219_gpio_driver = {
> + .driver = {
> + .name = "tps65219-gpio",
> + },
> + .probe = tps65219_gpio_probe,
> +};
> +module_platform_driver(tps65219_gpio_driver);
> +
> +MODULE_ALIAS("platform:tps65219-gpio");
> +MODULE_AUTHOR("Jonathan Cormier <[email protected]>");
> +MODULE_DESCRIPTION("TPS65219 GPIO driver");
> +MODULE_LICENSE("GPL");
>
> --
> 2.34.1
>
--
With Best Regards,
Andy Shevchenko
On Wed, Jun 7, 2023 at 4:39 PM Jerome Neanne <[email protected]> wrote:
>
> Add support for TPS65219 PMICs GPIO interface.
>
> 3 GPIO pins:
> - GPIO0 only is IO but input mode reserved for MULTI_DEVICE_ENABLE usage.
> - GPIO1 and GPIO2 are Output only and referred as GPO1 and GPO2 in spec.
>
> GPIO0 is statically configured as input or output prior to Linux boot.
> it is used for MULTI_DEVICE_ENABLE function.
> This setting is statically configured by NVM.
> GPIO0 can't be used as a generic GPIO (specification Table 8-34).
> It's either a GPO when MULTI_DEVICE_EN=0 or a GPI when MULTI_DEVICE_EN=1.
>
> Datasheet describes specific usage for non standard GPIO.
>
> Datasheet: https://www.ti.com/lit/ds/symlink/tps65219.pdf
> Co-developed-by: Jonathan Cormier <[email protected]>
> Signed-off-by: Jonathan Cormier <[email protected]>
> Reviewed-by: Linus Walleij <[email protected]>
> Signed-off-by: Jerome Neanne <[email protected]>
> ---
Applied, thanks!
Bart