[PATCH v2 23/30] gpio: nomadik: handle variadic GPIO count

Théo Lebrun
2024-02-28T11:33:04Z

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>
---
drivers/gpio/gpio-nomadik.c | 9 +++++++--
1 file 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;

--
2.44.0