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gpiolib: Override gpiochip numbers with DT aliases

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In the same way that other subsystems support the setting of device
id numbers from Device Tree aliases, allow gpiochip numbers to be
derived from "gpiochip<n>" aliases.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2024-05-02 16:17:02 +01:00
committed by Dom Cobley
parent 2f0aa553b6
commit ac2e9d4f1f
1 changed files with 12 additions and 1 deletions
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13
drivers/gpio/gpiolib.c
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@@ -118,6 +118,7 @@ static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc);
static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc);
static bool gpiolib_initialized;
static int first_dynamic_gpiochip_num = -1;
const char *gpiod_get_label(struct gpio_desc *desc)
{
@@ -1038,6 +1039,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
unsigned int desc_index;
int base = 0;
int ret;
int id;
/*
* First: allocate and populate the internal stat container, and
@@ -1057,7 +1059,16 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
device_set_node(&gdev->dev, gpiochip_choose_fwnode(gc));
ret = ida_alloc(&gpio_ida, GFP_KERNEL);
if (first_dynamic_gpiochip_num < 0) {
id = of_alias_get_highest_id("gpiochip");
first_dynamic_gpiochip_num = (id >= 0) ? (id + 1) : 0;
}
id = of_alias_get_id(gdev->dev.of_node, "gpiochip");
if (id < 0)
id = first_dynamic_gpiochip_num;
ret = ida_alloc_range(&gpio_ida, id, ~0, GFP_KERNEL);
if (ret < 0)
goto err_free_gdev;
gdev->id = ret;