diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0728-regulator-gpio-Allow-nonexclusive-GPIO-access.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0728-regulator-gpio-Allow-nonexclusive-GPIO-access.patch | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0728-regulator-gpio-Allow-nonexclusive-GPIO-access.patch b/target/linux/brcm2708/patches-4.19/950-0728-regulator-gpio-Allow-nonexclusive-GPIO-access.patch deleted file mode 100644 index e0ffaae209..0000000000 --- a/target/linux/brcm2708/patches-4.19/950-0728-regulator-gpio-Allow-nonexclusive-GPIO-access.patch +++ /dev/null @@ -1,79 +0,0 @@ -From f6d983b7bc9ae79d0eb4dea7bc30a1ad5ff428a7 Mon Sep 17 00:00:00 2001 -From: Linus Walleij <linus.walleij@linaro.org> -Date: Fri, 12 Oct 2018 14:54:12 +0200 -Subject: [PATCH] regulator/gpio: Allow nonexclusive GPIO access - -commit b0ce7b29bfcd090ddba476f45a75ec0a797b048a upstream. - -[ This is a partial cherry-pick, omitting the regulator -change which isn't required ] - -This allows nonexclusive (simultaneous) access to a single -GPIO line for the fixed regulator enable line. This happens -when several regulators use the same GPIO for enabling and -disabling a regulator, and all need a handle on their GPIO -descriptor. - -This solution with a special flag is not entirely elegant -and should ideally be replaced by something more careful as -this makes it possible for several consumers to -enable/disable the same GPIO line to the left and right -without any consistency. The current use inside the regulator -core should however be fine as it takes special care to -handle this. - -For the state of the GPIO backend, this is still the -lesser evil compared to going back to global GPIO -numbers. - -Cc: Marek Szyprowski <m.szyprowski@samsung.com> -Cc: Jon Hunter <jonathanh@nvidia.com> -Fixes: efdfeb079cc3 ("regulator: fixed: Convert to use GPIO descriptor only") -Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> -Tested-by: Jon Hunter <jonathanh@nvidia.com> -Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> -Signed-off-by: Linus Walleij <linus.walleij@linaro.org> -Signed-off-by: Mark Brown <broonie@kernel.org> ---- - drivers/gpio/gpiolib.c | 19 +++++++++++++++++-- - include/linux/gpio/consumer.h | 1 + - 2 files changed, 18 insertions(+), 2 deletions(-) - ---- a/drivers/gpio/gpiolib.c -+++ b/drivers/gpio/gpiolib.c -@@ -3979,8 +3979,23 @@ struct gpio_desc *__must_check gpiod_get - * the device name as label - */ - status = gpiod_request(desc, con_id ? con_id : devname); -- if (status < 0) -- return ERR_PTR(status); -+ if (status < 0) { -+ if (status == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) { -+ /* -+ * This happens when there are several consumers for -+ * the same GPIO line: we just return here without -+ * further initialization. It is a bit if a hack. -+ * This is necessary to support fixed regulators. -+ * -+ * FIXME: Make this more sane and safe. -+ */ -+ dev_info(dev, "nonexclusive access to GPIO for %s\n", -+ con_id ? con_id : devname); -+ return desc; -+ } else { -+ return ERR_PTR(status); -+ } -+ } - - status = gpiod_configure_flags(desc, con_id, lookupflags, flags); - if (status < 0) { ---- a/include/linux/gpio/consumer.h -+++ b/include/linux/gpio/consumer.h -@@ -30,6 +30,7 @@ struct gpio_descs { - #define GPIOD_FLAGS_BIT_DIR_OUT BIT(1) - #define GPIOD_FLAGS_BIT_DIR_VAL BIT(2) - #define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3) -+#define GPIOD_FLAGS_BIT_NONEXCLUSIVE BIT(4) - - /** - * Optional flags that can be passed to one of gpiod_* to configure direction |