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>
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@ -8,8 +8,9 @@
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* All enquiries to support@picochip.com
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*/
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#include <linux/acpi.h>
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#include <linux/gpio/driver.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/gpio/driver.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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@ -98,6 +99,7 @@ struct dwapb_gpio {
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struct irq_domain *domain;
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unsigned int flags;
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struct reset_control *rst;
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struct clk *clk;
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};
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static inline u32 gpio_reg_v2_convert(unsigned int offset)
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@ -670,6 +672,16 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
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if (IS_ERR(gpio->regs))
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return PTR_ERR(gpio->regs);
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/* Optional bus clock */
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gpio->clk = devm_clk_get(&pdev->dev, "bus");
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if (!IS_ERR(gpio->clk)) {
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err = clk_prepare_enable(gpio->clk);
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if (err) {
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dev_info(&pdev->dev, "Cannot enable clock\n");
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return err;
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}
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}
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gpio->flags = 0;
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if (dev->of_node) {
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const struct of_device_id *of_devid;
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@ -712,6 +724,7 @@ static int dwapb_gpio_remove(struct platform_device *pdev)
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dwapb_gpio_unregister(gpio);
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dwapb_irq_teardown(gpio);
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reset_control_assert(gpio->rst);
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clk_disable_unprepare(gpio->clk);
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return 0;
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}
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@ -757,6 +770,8 @@ static int dwapb_gpio_suspend(struct device *dev)
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}
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spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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clk_disable_unprepare(gpio->clk);
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return 0;
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}
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@ -768,6 +783,9 @@ static int dwapb_gpio_resume(struct device *dev)
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unsigned long flags;
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int i;
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if (!IS_ERR(gpio->clk))
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clk_prepare_enable(gpio->clk);
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spin_lock_irqsave(&gc->bgpio_lock, flags);
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for (i = 0; i < gpio->nr_ports; i++) {
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unsigned int offset;
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