From 50bc2a4953cceb70f90d37fd513dd1231367aa4d Mon Sep 17 00:00:00 2001 From: =?utf8?q?Th=C3=A9o=20Lebrun?= Date: Wed, 28 Feb 2024 12:28:21 +0100 Subject: [PATCH] gpio: nomadik: handle variadic GPIO count MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Théo Lebrun Link: https://lore.kernel.org/r/20240228-mbly-gpio-v2-23-3ba757474006@bootlin.com Signed-off-by: Linus Walleij --- 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 ca5c28965224b..19394dc7e34a0 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; -- 2.30.2