[PATCH v2 23/30] gpio: nomadik: handle variadic GPIO count
From: Théo Lebrun <theo.lebrun@bootlin.com>
Date: 2024-02-28 11:28:29
Also in:
linux-devicetree, linux-gpio, linux-mips, lkml
Subsystem:
arm/nomadik/ux500 architectures, gpio subsystem, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds
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 <redacted> 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
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