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Subject[PATCH] gpio: mxc: add clock operation
Date
i.MX6SLL has GPIO clock gates in CCM CCGR, need
to enable them before accessing registers, add
optional clock operation for GPIO driver.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
drivers/gpio/gpio-mxc.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 11ec722..8fc37c4 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -60,6 +60,7 @@ struct mxc_gpio_hwdata {
struct mxc_gpio_port {
struct list_head node;
void __iomem *base;
+ struct clk *clk;
int irq;
int irq_high;
struct irq_domain *domain;
@@ -434,6 +435,17 @@ static int mxc_gpio_probe(struct platform_device *pdev)
if (port->irq < 0)
return port->irq;

+ /* the controller clock is optional */
+ port->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(port->clk))
+ port->clk = NULL;
+
+ err = clk_prepare_enable(port->clk);
+ if (err) {
+ dev_err(&pdev->dev, "Unable to enable clock.\n");
+ return err;
+ }
+
/* disable the interrupt and clear the status */
writel(0, port->base + GPIO_IMR);
writel(~0, port->base + GPIO_ISR);
@@ -502,6 +514,7 @@ static int mxc_gpio_probe(struct platform_device *pdev)
out_irqdomain_remove:
irq_domain_remove(port->domain);
out_bgio:
+ clk_disable_unprepare(port->clk);
dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
return err;
}
--
2.7.4
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