bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch b/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
new file mode 100644
index 0000000000..ca66626711
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0128-gpiolib-Don-t-prevent-IRQ-usage-of-output-GPIOs.patch
@@ -0,0 +1,48 @@
+From 122b21149cada59805040895f3d679ceb0e00063 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Tue, 24 Apr 2018 14:42:27 +0100
+Subject: [PATCH] gpiolib: Don't prevent IRQ usage of output GPIOs
+
+Upstream Linux deems using output GPIOs to generate IRQs as a bogus
+use case, even though the BCM2835 GPIO controller is capable of doing
+so. A number of users would like to make use of this facility, so
+disable the checks.
+
+See: https://github.com/raspberrypi/linux/issues/2527
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/gpio/gpiolib.c | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+--- a/drivers/gpio/gpiolib.c
++++ b/drivers/gpio/gpiolib.c
+@@ -55,6 +55,8 @@
+ #define	extra_checks	0
+ #endif
+ 
++#define dont_test_bit(b,d) (0)
++
+ /* Device and char device-related information */
+ static DEFINE_IDA(gpio_ida);
+ static dev_t gpio_devt;
+@@ -3084,8 +3086,8 @@ int gpiod_direction_output(struct gpio_d
+ 		value = !!value;
+ 
+ 	/* GPIOs used for enabled IRQs shall not be set as output */
+-	if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
+-	    test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
++	if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
++	    dont_test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
+ 		gpiod_err(desc,
+ 			  "%s: tried to set a GPIO tied to an IRQ as output\n",
+ 			  __func__);
+@@ -3887,7 +3889,7 @@ int gpiochip_lock_as_irq(struct gpio_chi
+ 		}
+ 	}
+ 
+-	if (test_bit(FLAG_IS_OUT, &desc->flags)) {
++	if (dont_test_bit(FLAG_IS_OUT, &desc->flags)) {
+ 		chip_err(chip,
+ 			 "%s: tried to flag a GPIO set as output for IRQ\n",
+ 			 __func__);