diff options
| author | Théo Lebrun <theo.lebrun@bootlin.com> | 2024-02-28 12:28:21 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2024-02-29 10:36:20 +0100 |
| commit | 50bc2a4953cceb70f90d37fd513dd1231367aa4d (patch) | |
| tree | 4e8b47bd64f90245a3ec0b5ed199275cb7a410f9 /drivers/gpio/gpio-nomadik.c | |
| parent | 8d74c3dc8f99d9867254004ed49508c13295cacd (diff) | |
| download | lwn-50bc2a4953cceb70f90d37fd513dd1231367aa4d.tar.gz lwn-50bc2a4953cceb70f90d37fd513dd1231367aa4d.zip | |
gpio: nomadik: handle variadic GPIO count
Read the "ngpios" property to determine the number of GPIOs for a bank.
If not available, fallback to NMK_GPIO_PER_CHIP ie 32 ie the current
behavior.
The IP block always supports 32 GPIOs, but platforms can expose a lesser
amount. The Mobileye EyeQ5 is in this case; one bank is 29 GPIOs and
the other is 23.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://lore.kernel.org/r/20240228-mbly-gpio-v2-23-3ba757474006@bootlin.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-nomadik.c')
| -rw-r--r-- | drivers/gpio/gpio-nomadik.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c index ca5c28965224..19394dc7e34a 100644 --- a/drivers/gpio/gpio-nomadik.c +++ b/drivers/gpio/gpio-nomadik.c @@ -488,7 +488,7 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np, struct gpio_chip *chip; struct clk *clk; void __iomem *base; - u32 id; + u32 id, ngpio; gpio_dev = bus_find_device_by_of_node(&platform_bus_type, np); if (!gpio_dev) { @@ -518,10 +518,15 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np, return ERR_PTR(-ENOMEM); } + if (device_property_read_u32(gpio_dev, "ngpios", &ngpio)) { + ngpio = NMK_GPIO_PER_CHIP; + dev_dbg(&pdev->dev, "populate: using default ngpio (%d)\n", ngpio); + } + nmk_chip->bank = id; chip = &nmk_chip->chip; chip->base = -1; - chip->ngpio = NMK_GPIO_PER_CHIP; + chip->ngpio = ngpio; chip->label = dev_name(gpio_dev); chip->parent = gpio_dev; |