[LINUX PATCH V3 3/9] gpio: gpio-xilinx: Add clock support

From: Srinivas Neeli
Date: Thu Nov 12 2020 - 12:13:30 EST


Adds clock support to the Xilinx GPIO driver.

Signed-off-by: Srinivas Neeli <srinivas.neeli@xxxxxxxxxx>
---
Chnages in V3:
-Created separate patch for Clock changes.
---
drivers/gpio/gpio-xilinx.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 17a8a8f90d84..99d603bfb6f0 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -6,6 +6,7 @@
*/

#include <linux/bitops.h>
+#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
@@ -38,6 +39,7 @@
* @gpio_state: GPIO state shadow register
* @gpio_dir: GPIO direction shadow register
* @gpio_lock: Lock used for synchronization
+ * @clk: clock resource for this driver
*/
struct xgpio_instance {
struct gpio_chip gc;
@@ -46,6 +48,7 @@ struct xgpio_instance {
u32 gpio_state[2];
u32 gpio_dir[2];
spinlock_t gpio_lock[2];
+ struct clk *clk;
};

static inline int xgpio_index(struct xgpio_instance *chip, int gpio)
@@ -333,11 +336,25 @@ static int xgpio_probe(struct platform_device *pdev)
return PTR_ERR(chip->regs);
}

+ chip->clk = devm_clk_get_optional(&pdev->dev, NULL);
+ if (IS_ERR(chip->clk)) {
+ if (PTR_ERR(chip->clk) != -EPROBE_DEFER)
+ dev_dbg(&pdev->dev, "Input clock not found\n");
+ return PTR_ERR(chip->clk);
+ }
+
+ status = clk_prepare_enable(chip->clk);
+ if (status < 0) {
+ dev_err(&pdev->dev, "Failed to prepare clk\n");
+ return status;
+ }
+
xgpio_save_regs(chip);

status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
if (status) {
dev_err(&pdev->dev, "failed to add GPIO chip\n");
+ clk_disable_unprepare(chip->clk);
return status;
}

--
2.7.4