Commit 0588504d authored by Alan Borzeszkowski's avatar Alan Borzeszkowski Committed by Bartosz Golaszewski
Browse files

gpio: graniterapids: Determine if GPIO pad can be used by driver 



Add check of HOSTSW_MODE bit to determine if GPIO pad can be used by the
driver.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarAlan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: default avatarAndy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20241204070415.1034449-6-mika.westerberg@linux.intel.com


Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
parent 15636b00

drivers/gpio/gpio-graniterapids.c

+16 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#define GNR_GPI_STATUS_OFFSET	0x14

#define GNR_GPI_ENABLE_OFFSET	0x24



#define GNR_CFG_DW_HOSTSW_MODE	BIT(27)

#define GNR_CFG_DW_RX_MASK	GENMASK(23, 22)

#define GNR_CFG_DW_RX_DISABLE	FIELD_PREP(GNR_CFG_DW_RX_MASK, 2)

#define GNR_CFG_DW_RX_EDGE	FIELD_PREP(GNR_CFG_DW_RX_MASK, 1)
@@ -90,6 +91,20 @@ static int gnr_gpio_configure_line(struct gpio_chip *gc, unsigned int gpio, 
	return 0;

}



static int gnr_gpio_request(struct gpio_chip *gc, unsigned int gpio)

{

	struct gnr_gpio *priv = gpiochip_get_data(gc);

	u32 dw;



	dw = readl(gnr_gpio_get_padcfg_addr(priv, gpio));

	if (!(dw & GNR_CFG_DW_HOSTSW_MODE)) {

		dev_warn(gc->parent, "GPIO %u is not owned by host", gpio);

		return -EBUSY;

	}



	return 0;

}



static int gnr_gpio_get(struct gpio_chip *gc, unsigned int gpio)

{

	const struct gnr_gpio *priv = gpiochip_get_data(gc);
@@ -141,6 +156,7 @@ static int gnr_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, in 


static const struct gpio_chip gnr_gpio_chip = {

	.owner		  = THIS_MODULE,

	.request	  = gnr_gpio_request,

	.get		  = gnr_gpio_get,

	.set		  = gnr_gpio_set,

	.get_direction    = gnr_gpio_get_direction,