korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-15 00:04:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

pinctrl: bcm2835: Make pin freeing behavior configurable

Browse Source 
Until now after a bcm2835 pin was freed its pinmux was set to GPIO_IN.
So in case it was configured as GPIO_OUT before the configured output
level also get lost. As long as GPIO sysfs was used this wasn't
actually a problem because the pins and their possible output level
were kept by sysfs.

Since more and more Raspberry Pi users start using libgpiod they are
confused about this behavior. So make the pin freeing behavior of
GPIO_OUT configurable via module parameter. In case
pinctrl-bcm2835.persist_gpio_outputs is set to 1, the output level is
kept.

This patch based on the downstream work of Phil Elwell.

Link: https://github.com/raspberrypi/linux/pull/6117
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Message-ID: <20240503062745.11298-1-wahrenst@gmx.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stefan Wahren 2024-05-03 08:27:45 +02:00 committed by Linus Walleij
parent 4ad4f6e2fd
commit 8ff05989b4
1 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/pinctrl/bcm/pinctrl-bcm2835.c
View File

@ -244,6 +244,10 @@ static const char * const irq_type_names[] = {
[IRQ_TYPE_LEVEL_LOW] = "level-low",
};
static bool persist_gpio_outputs;
module_param(persist_gpio_outputs, bool, 0644);
MODULE_PARM_DESC(persist_gpio_outputs, "Enable GPIO_OUT persistence when pin is freed");
static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
{
return readl(pc->base + reg);
@ -926,6 +930,13 @@ static int bcm2835_pmx_free(struct pinctrl_dev *pctldev,
unsigned offset)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
if (fsel == BCM2835_FSEL_GPIO_IN)
return 0;
if (persist_gpio_outputs && fsel == BCM2835_FSEL_GPIO_OUT)
return 0;
/* disable by setting to GPIO_IN */
bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
@ -970,10 +981,7 @@ static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
/* disable by setting to GPIO_IN */
bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
bcm2835_pmx_free(pctldev, offset);
}
static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
@ -1419,6 +1427,9 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
goto out_remove;
}
dev_info(dev, "GPIO_OUT persistence: %s\n",
persist_gpio_outputs ? "yes" : "no");
return 0;
out_remove: