Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-01 10:45:49 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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: Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20241204070415.1034449-6-mika.westerberg@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Alan Borzeszkowski 2024-12-04 09:04:13 +02:00 committed by Bartosz Golaszewski
parent 15636b00a0
commit 0588504d28
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpio/gpio-graniterapids.c
View File

@ -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,