gpio: mvebu: Add clk support to prevent lockup

The kirkwood SoC GPIO cores use the runit clock. Add code to
clk_prepare_enable() runit, otherwise there is a danger of locking up
the SoC by accessing the GPIO registers when runit clock is not
ticking.

Reported-by: Simon Baatz <gmbnomis@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Simon Baatz <gmbnomis@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
index 19709fbe12cf..cf8e8926a034 100644
--- a/arch/arm/boot/dts/kirkwood.dtsi
+++ b/arch/arm/boot/dts/kirkwood.dtsi
@@ -38,6 +38,7 @@
                         interrupt-controller;
                         #interrupt-cells = <2>;
                         interrupts = <35>, <36>, <37>, <38>;
+                        clocks = <&gate_clk 7>;
                 };
 
                 gpio1: gpio@10140 {
@@ -49,6 +50,7 @@
                         interrupt-controller;
                         #interrupt-cells = <2>;
                         interrupts = <39>, <40>, <41>;
+                        clocks = <&gate_clk 7>;
                 };
 
                 serial@12000 {