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gpio: tps68470: Add i2c daisy chain support

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The tps68470 daisy chain make use of gpio 1 and 2. When in use, these
gpios must be configured as inputs without pull-up.

Signed-off-by: Antti Laakso <antti.laakso@linux.intel.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Antti Laakso 2026-03-11 15:19:09 +02:00 committed by Hans Verkuil
parent 13abea4776
commit eac4a8e26d
1 changed files with 20 additions and 1 deletions
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21
drivers/gpio/gpio-tps68470.c
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@ -120,6 +120,17 @@ static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
TPS68470_GPIO_MODE_MASK, 0x00);
}
static int tps68470_enable_i2c_daisy_chain(struct gpio_chip *gc)
{
int ret;
ret = tps68470_gpio_input(gc, 1);
if (ret)
return ret;
return tps68470_gpio_input(gc, 2);
}
static const char *tps68470_names[TPS68470_N_GPIO] = {
"gpio.0", "gpio.1", "gpio.2", "gpio.3",
"gpio.4", "gpio.5", "gpio.6",
@ -129,6 +140,7 @@ static const char *tps68470_names[TPS68470_N_GPIO] = {
static int tps68470_gpio_probe(struct platform_device *pdev)
{
struct tps68470_gpio_data *tps68470_gpio;
int ret;
tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
GFP_KERNEL);
@ -149,7 +161,14 @@ static int tps68470_gpio_probe(struct platform_device *pdev)
tps68470_gpio->gc.base = -1;
tps68470_gpio->gc.parent = &pdev->dev;
return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
if (ret)
return ret;
if (device_property_present(&pdev->dev, "daisy-chain-enable"))
ret = tps68470_enable_i2c_daisy_chain(&tps68470_gpio->gc);
return ret;
}
static struct platform_driver tps68470_gpio_driver = {