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gpio: gpio-xilinx: Add clock support 

Adds clock support to the Xilinx GPIO driver.

Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/1605201148-4508-4-git-send-email-srinivas.neeli@xilinx.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Srinivas Neeli 2020-11-12 22:42:22 +05:30 committed by Linus Walleij
parent 700a2b53bd
commit 65bbe531b5
1 changed files with 17 additions and 0 deletions
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17
drivers/gpio/gpio-xilinx.c
View File

@ -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)
@ -334,11 +337,25 @@ 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;
}