diff options
| author | Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com> | 2024-12-04 09:04:13 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-12-10 10:35:13 +0100 |
| commit | 0588504d28dedde6789aec17a6ece6fa8e477725 (patch) | |
| tree | 772cdd3badb887545035fffcaa5fee12f3a1cf43 /drivers/gpio | |
| parent | 15636b00a055474033426b94b6372728b2163a1e (diff) | |
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: 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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-graniterapids.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-graniterapids.c b/drivers/gpio/gpio-graniterapids.c index ec2931a65723..b12abe77299c 100644 --- a/drivers/gpio/gpio-graniterapids.c +++ b/drivers/gpio/gpio-graniterapids.c @@ -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, |