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gpio: mvebu: Add clk support to prevent lockup

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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>
This commit is contained in:
Andrew Lunn 2013-02-03 11:34:26 +01:00 committed by Jason Cooper
parent 7bf5b408b4
commit de88747f51
2 changed files with 9 additions and 0 deletions
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2
arch/arm/boot/dts/kirkwood.dtsi
View File

@ -38,6 +38,7 @@ gpio0: gpio@10100 {
interrupt-controller;
#interrupt-cells = <2>;
interrupts = <35>, <36>, <37>, <38>;
clocks = <&gate_clk 7>;
};
gpio1: gpio@10140 {
@ -49,6 +50,7 @@ gpio1: gpio@10140 {
interrupt-controller;
#interrupt-cells = <2>;
interrupts = <39>, <40>, <41>;
clocks = <&gate_clk 7>;
};
serial@12000 {

7
drivers/gpio/gpio-mvebu.c
View File

@ -42,6 +42,7 @@
#include <linux/io.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/pinctrl/consumer.h>
/*
@ -496,6 +497,7 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
struct resource *res;
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
struct clk *clk;
unsigned int ngpios;
int soc_variant;
int i, cpu, id;
@ -529,6 +531,11 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
return id;
}
clk = devm_clk_get(&pdev->dev, NULL);
/* Not all SoCs require a clock.*/
if (!IS_ERR(clk))
clk_prepare_enable(clk);
mvchip->soc_variant = soc_variant;
mvchip->chip.label = dev_name(&pdev->dev);
mvchip->chip.dev = &pdev->dev;