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gpio: nomadik: handle variadic GPIO count

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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>
This commit is contained in:
Théo Lebrun 2024-02-28 12:28:21 +01:00 committed by Linus Walleij
parent 8d74c3dc8f
commit 50bc2a4953
1 changed files with 7 additions and 2 deletions
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9
drivers/gpio/gpio-nomadik.c
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@ -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;