[OpenWrt-Devel] [PATCH] ralink: Add support for GPIO as interrupt-controller

[Daniel Santos]

The gpio-ralink driver has everything it needs to be used as an
interrupt controller except for device tree support.  This simple patch
adds that support by configuring the irq domain to use two cells and
adding the appropriate documentation to the devicetree bindings.

Signed-off-by: Daniel Santos <daniel.santos at pobox.com>
---
 ...-Add-support-for-GPIO-as-interrupt-contro.patch | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 target/linux/ramips/patches-4.14/0029-gpio-ralink-Add-support-for-GPIO-as-interrupt-contro.patch

diff --git a/target/linux/ramips/patches-4.14/0029-gpio-ralink-Add-support-for-GPIO-as-interrupt-contro.patch b/target/linux/ramips/patches-4.14/0029-gpio-ralink-Add-support-for-GPIO-as-interrupt-contro.patch
new file mode 100644
index 0000000000..d93f39c746
--- /dev/null
+++ b/target/linux/ramips/patches-4.14/0029-gpio-ralink-Add-support-for-GPIO-as-interrupt-contro.patch
@@ -0,0 +1,51 @@
+From 57fa7f2f4ef6f78ce1d30509c0d111aa3791b524 Mon Sep 17 00:00:00 2001
+From: Daniel Santos <daniel.santos at pobox.com>
+Date: Sun, 4 Nov 2018 20:24:32 -0600
+Subject: gpio-ralink: Add support for GPIO as interrupt-controller
+
+Signed-off-by: Daniel Santos <daniel.santos at pobox.com>
+---
+ Documentation/devicetree/bindings/gpio/gpio-ralink.txt | 6 ++++++
+ drivers/gpio/gpio-ralink.c                             | 2 +-
+ 2 files changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/Documentation/devicetree/bindings/gpio/gpio-ralink.txt b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
+index 5cd17f225fe3..2775449614d4 100644
+--- a/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
++++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
+@@ -17,6 +17,9 @@ Required properties:
+ 
+ Optional properties:
+ - ralink,gpio-base : Specify the GPIO chips base number
++- interrupt-controller : marks this as an interrupt controller
++- #interrupt-cells : a standard two-cell interrupt flag, see
++  interrupt-controller/interrupts.txt
+ 
+ Example:
+ 
+@@ -28,6 +31,9 @@ Example:
+ 
+ 		reg = <0x600 0x34>;
+ 
++		interrupt-controller;
++		#interrupt-cells = <2>;
++
+ 		interrupt-parent = <&intc>;
+ 		interrupts = <6>;
+ 
+diff --git a/drivers/gpio/gpio-ralink.c b/drivers/gpio/gpio-ralink.c
+index 27910e384013..b6e30083d012 100644
+--- a/drivers/gpio/gpio-ralink.c
++++ b/drivers/gpio/gpio-ralink.c
+@@ -220,7 +220,7 @@ static int gpio_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+ }
+ 
+ static const struct irq_domain_ops irq_domain_ops = {
+-	.xlate = irq_domain_xlate_onecell,
++	.xlate = irq_domain_xlate_twocell,
+ 	.map = gpio_map,
+ };
+ 
+-- 
+2.16.4
+
-- 
2.16.4


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