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Subject[PATCH v2] gpio: dwapb: Add support for a bus clock
Date
Enable an optional bus clock provided by DT.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
---
v2:
- Fix include order.
- Use a clock name.
- Check errors from clk_prepare_enable()
- Add calls to enable/disable the clock in PM
---
drivers/gpio/gpio-dwapb.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index b0704a8..226977f 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;
--
2.7.4
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