mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-21 23:57:36 -04:00
Code Issues Packages Projects Releases Wiki Activity

gpio: regmap: Don't set a fixed direction line

Browse Source 
If a GPIO line has a fixed direction, report an error if a consumer
anyway tries to set the direction to something other than what it is
hardcoded to.

This didn't happen much before because what we supported was all lines
input or output and then the implementer would probably not specify the
direction registers, but with sparse fixed direction we can have
a mixture so let's take this into account.

As a consequence, since gpio_regmap_set_direction() can now fail, alter
the semantics in gpio_regmap_direction_output() such that we first check
if we can set the direction to output before we set the value and the
direction.

Suggested-by: Sashiko <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260507-regmap-gpio-sparse-fixed-dir-v1-1-a2e5855e2701%40kernel.org
Signed-off-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Alex Elder <elder@riscstar.com>
Tested-by: Alex Elder <elder@riscstar.com>
Link: https://patch.msgid.link/20260511-regmap-gpio-sparse-fixed-dir-v3-2-1429ec453be7@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Linus Walleij
2026-05-11 21:43:44 +02:00
committed by Bartosz Golaszewski
parent 68d801eabd
commit 806e7acf7f
1 changed files with 37 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/gpio/gpio-regmap.c
View File

@@ -196,6 +196,22 @@ static int gpio_regmap_get_direction(struct gpio_chip *chip,
return GPIO_LINE_DIRECTION_IN;
}
static int gpio_regmap_try_direction_fixed(struct gpio_regmap *gpio,
unsigned int offset, bool output)
{
if (test_bit(offset, gpio->fixed_direction_output)) {
if (output)
return 0;
else
return -EINVAL;
} else {
if (output)
return -EINVAL;
else
return 0;
}
}
static int gpio_regmap_set_direction(struct gpio_chip *chip,
unsigned int offset, bool output)
{
@@ -203,6 +219,13 @@ static int gpio_regmap_set_direction(struct gpio_chip *chip,
unsigned int base, val, reg, mask;
int invert, ret;
/*
* If the direction is fixed, only accept the fixed
* direction in this call.
*/
if (gpio_regmap_fixed_direction(gpio, offset))
return gpio_regmap_try_direction_fixed(gpio, offset, output);
if (gpio->reg_dir_out_base) {
base = gpio_regmap_addr(gpio->reg_dir_out_base);
invert = 0;
@@ -234,6 +257,20 @@ static int gpio_regmap_direction_input(struct gpio_chip *chip,
static int gpio_regmap_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct gpio_regmap *gpio = gpiochip_get_data(chip);
int ret;
/*
* First check if this is gonna work on a fixed direction line,
* if it doesn't (i.e. this is a fixed input line), then do not
* attempt to set the output value either and just bail out.
*/
if (gpio_regmap_fixed_direction(gpio, offset)) {
ret = gpio_regmap_try_direction_fixed(gpio, offset, true);
if (ret)
return ret;
}
gpio_regmap_set(chip, offset, value);
return gpio_regmap_set_direction(chip, offset, true);