diff options
| author |   Andrew Lunn <andrew@lunn.ch> | 2013-02-03 11:34:26 +0100 |
|---|---|---|
| committer |   Jason Cooper <jason@lakedaemon.net> | 2013-03-08 21:34:34 +0000 |
| commit | de88747f514a4e0cca416a8871de2302f4f77790 (patch) | |
| tree | a0a44be0a4ca5f16784bed1ee835b9ec85ddda5a /drivers/gpio | |
| parent | ARM: kirkwood: fix to retain gbe MAC addresses for DT kernels (diff) | |
| download | linux-dev-de88747f514a4e0cca416a8871de2302f4f77790.tar.xz linux-dev-de88747f514a4e0cca416a8871de2302f4f77790.zip | |
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-mvebu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index 7472182967ce..61a6fde6c089 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -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; |