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authorDoug Berger <opendmb@gmail.com>2024-04-24 11:50:38 -0700
committerBartosz Golaszewski <bartosz.golaszewski@linaro.org>2024-04-26 09:32:54 +0200
commite818cd3c8a345c046edff00b5ad0be4d39f7e4d4 (patch)
treeb2e1b5c63c3e64b7b836a8965ffc667c1b9ffcad /drivers/gpio
parent7c66f8173360556ac0c3c38a91234af5a0a5a4a9 (diff)
gpio: of: support gpio-ranges for multiple gpiochip devices
Some drivers (e.g. gpio-mt7621 and gpio-brcmstb) have multiple gpiochip banks within a single device. Unfortunately, the gpio-ranges property of the device node was being applied to every gpiochip of the device with device relative GPIO offset values rather than gpiochip relative GPIO offset values. This commit makes use of the gpio_chip offset value which can be non-zero for such devices to split the device node gpio-ranges property into GPIO offset ranges that can be applied to each of the relevant gpiochips of the device. Signed-off-by: Doug Berger <opendmb@gmail.com> Acked-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://lore.kernel.org/r/20240424185039.1707812-3-opendmb@gmail.com Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib-of.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index cb0cefaec37e..d75f6ee37028 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -1037,7 +1037,7 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
struct of_phandle_args pinspec;
struct pinctrl_dev *pctldev;
struct device_node *np;
- int index = 0, ret;
+ int index = 0, ret, trim;
const char *name;
static const char group_names_propname[] = "gpio-ranges-group-names";
struct property *group_names;
@@ -1059,7 +1059,14 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
if (!pctldev)
return -EPROBE_DEFER;
+ /* Ignore ranges outside of this GPIO chip */
+ if (pinspec.args[0] >= (chip->offset + chip->ngpio))
+ continue;
+ if (pinspec.args[0] + pinspec.args[2] <= chip->offset)
+ continue;
+
if (pinspec.args[2]) {
+ /* npins != 0: linear range */
if (group_names) {
of_property_read_string_index(np,
group_names_propname,
@@ -1070,7 +1077,19 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
break;
}
}
- /* npins != 0: linear range */
+
+ /* Trim the range to fit this GPIO chip */
+ if (chip->offset > pinspec.args[0]) {
+ trim = chip->offset - pinspec.args[0];
+ pinspec.args[2] -= trim;
+ pinspec.args[1] += trim;
+ pinspec.args[0] = 0;
+ } else {
+ pinspec.args[0] -= chip->offset;
+ }
+ if ((pinspec.args[0] + pinspec.args[2]) > chip->ngpio)
+ pinspec.args[2] = chip->ngpio - pinspec.args[0];
+
ret = gpiochip_add_pin_range(chip,
pinctrl_dev_get_devname(pctldev),
pinspec.args[0],