diff options
| author | Phil Edworthy <phil.edworthy@renesas.com> | 2018-03-12 18:30:56 +0000 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-03-27 15:18:19 +0200 |
| commit | e6bf37736f6495fb87ce5525d1f6fd2adce307f1 (patch) | |
| tree | a6abee670fbfc56abc02ede30b8e4a9d2fac69cb /drivers/gpio/gpio-dwapb.c | |
| parent | 13b5319e92a94036ce2131f76510e108428daec8 (diff) | |
| download | linux-e6bf37736f6495fb87ce5525d1f6fd2adce307f1.tar.gz | |
gpio: dwapb: Add support for a bus clock
Enable an optional bus clock provided by DT. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-dwapb.c')
| -rw-r--r-- | drivers/gpio/gpio-dwapb.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index b0704a883513..226977f78482 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -8,8 +8,9 @@ * All enquiries to support@picochip.com */ #include <linux/acpi.h> -#include <linux/gpio/driver.h> +#include <linux/clk.h> #include <linux/err.h> +#include <linux/gpio/driver.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -98,6 +99,7 @@ struct dwapb_gpio { struct irq_domain *domain; unsigned int flags; struct reset_control *rst; + struct clk *clk; }; static inline u32 gpio_reg_v2_convert(unsigned int offset) @@ -670,6 +672,16 @@ static int dwapb_gpio_probe(struct platform_device *pdev) if (IS_ERR(gpio->regs)) return PTR_ERR(gpio->regs); + /* Optional bus clock */ + gpio->clk = devm_clk_get(&pdev->dev, "bus"); + if (!IS_ERR(gpio->clk)) { + err = clk_prepare_enable(gpio->clk); + if (err) { + dev_info(&pdev->dev, "Cannot enable clock\n"); + return err; + } + } + gpio->flags = 0; if (dev->of_node) { const struct of_device_id *of_devid; @@ -712,6 +724,7 @@ static int dwapb_gpio_remove(struct platform_device *pdev) dwapb_gpio_unregister(gpio); dwapb_irq_teardown(gpio); reset_control_assert(gpio->rst); + clk_disable_unprepare(gpio->clk); return 0; } @@ -757,6 +770,8 @@ static int dwapb_gpio_suspend(struct device *dev) } spin_unlock_irqrestore(&gc->bgpio_lock, flags); + clk_disable_unprepare(gpio->clk); + return 0; } @@ -768,6 +783,9 @@ static int dwapb_gpio_resume(struct device *dev) unsigned long flags; int i; + if (!IS_ERR(gpio->clk)) + clk_prepare_enable(gpio->clk); + spin_lock_irqsave(&gc->bgpio_lock, flags); for (i = 0; i < gpio->nr_ports; i++) { unsigned int offset; |