[PATCH] pinctrl: bcm2835: Make pin freeing behavior configurable

[Stefan Wahren]

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.strict_gpiod is set to 0, 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 at gmx.net>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index f5a9372d43bd..a5b2096c97fc 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -244,6 +244,10 @@ static const char * const irq_type_names[] = {
 	[IRQ_TYPE_LEVEL_LOW] = "level-low",
 };

+static bool strict_gpiod = true;
+module_param(strict_gpiod, bool, 0644);
+MODULE_PARM_DESC(strict_gpiod, "unless true, GPIO_OUT remain when pin freed");
+
 static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
 {
 	return readl(pc->base + reg);
@@ -926,6 +930,14 @@ 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;
+
+	/* preserve GPIO_OUT in non-strict mode */
+	if (!strict_gpiod && 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 +982,7 @@ 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 +1428,9 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
 		goto out_remove;
 	}

+	dev_info(dev, "GPIO_OUT remain when pin freed: %s\n",
+		 strict_gpiod ? "no" : "yes");
+
 	return 0;

 out_remove:
--
2.34.1