github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-29 17:43:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

gpio: mmio: get chip label and GPIO base from device properties

Browse Source 
Ahead of removing struct bgpio_pdata support from the gpio-mmio generic
module, let's add support for getting the relevant values from generic
device properties. "label" is a semi-standardized property in some GPIO
drivers so let's go with it. There's no standard "base" property, so
let's use the name "gpio-mmio,base" to tie it to this driver
specifically. The number of GPIOs will be retrieved using
gpiochip_get_ngpios() so there's no need to look it up in the software
node.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250701-gpio-mmio-pdata-v2-2-ebf34d273497@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2025-07-01 13:49:36 +02:00
parent e567269e24
commit c4a8348405
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpio/gpio-mmio.c
View File

@ -715,6 +715,9 @@ MODULE_DEVICE_TABLE(of, bgpio_of_match);
static struct bgpio_pdata *bgpio_parse_fw(struct device *dev, unsigned long *flags)
{
struct bgpio_pdata *pdata;
const char *label;
unsigned int base;
int ret;
if (!dev_fwnode(dev))
return NULL;
@ -731,6 +734,18 @@ static struct bgpio_pdata *bgpio_parse_fw(struct device *dev, unsigned long *fla
if (device_property_read_bool(dev, "no-output"))
*flags |= BGPIOF_NO_OUTPUT;
ret = device_property_read_string(dev, "label", &label);
if (!ret)
pdata->label = label;
/*
* This property *must not* be used in device-tree sources, it's only
* meant to be passed to the driver from board files and MFD core.
*/
ret = device_property_read_u32(dev, "gpio-mmio,base", &base);
if (!ret && base <= INT_MAX)
pdata->base = base;
return pdata;
}