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gpio: dwapb: Add debounce reference clock support 

Aside from the APB reference clock DW GPIO controller can have a
dedicated clock connected to setup a debounce time interval for
GPIO-based IRQs. Since this functionality is optional the corresponding
clock source is also optional. Due to this lets handle the debounce
clock in the same way as it has been developed for the APB reference
clock, but using the bulk request/enable-disable methods.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200323195401.30338-6-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Serge Semin 2020-03-23 22:54:00 +03:00 committed by Linus Walleij
parent 3ea8094c3b
commit 5c544c92d6
1 changed files with 22 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpio/gpio-dwapb.c
View File

@ -62,6 +62,8 @@
#define GPIO_INTSTATUS_V2 0x3c
#define GPIO_PORTA_EOI_V2 0x40
#define DWAPB_NR_CLOCKS 2
struct dwapb_gpio;
#ifdef CONFIG_PM_SLEEP
@ -97,7 +99,7 @@ struct dwapb_gpio {
struct irq_domain *domain;
unsigned int flags;
struct reset_control *rst;
struct clk *clk;
struct clk_bulk_data clks[DWAPB_NR_CLOCKS];
};
static inline u32 gpio_reg_v2_convert(unsigned int offset)
@ -689,16 +691,19 @@ 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_optional(&pdev->dev, "bus");
if (IS_ERR(gpio->clk)) {
dev_err(&pdev->dev, "Cannot get APB clock\n");
return PTR_ERR(gpio->clk);
/* Optional bus and debounce clocks */
gpio->clks[0].id = "bus";
gpio->clks[1].id = "db";
err = devm_clk_bulk_get_optional(&pdev->dev, DWAPB_NR_CLOCKS,
gpio->clks);
if (err) {
dev_err(&pdev->dev, "Cannot get APB/Debounce clocks\n");
return err;
}
err = clk_prepare_enable(gpio->clk);
err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
if (err) {
dev_err(&pdev->dev, "Cannot enable APB clock\n");
dev_err(&pdev->dev, "Cannot enable APB/Debounce clocks\n");
return err;
}
@ -727,7 +732,7 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
out_unregister:
dwapb_gpio_unregister(gpio);
dwapb_irq_teardown(gpio);
clk_disable_unprepare(gpio->clk);
clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
return err;
}
@ -739,7 +744,7 @@ 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);
clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
return 0;
}
@ -784,7 +789,7 @@ static int dwapb_gpio_suspend(struct device *dev)
}
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
clk_disable_unprepare(gpio->clk);
clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
return 0;
}
@ -794,9 +799,13 @@ static int dwapb_gpio_resume(struct device *dev)
struct dwapb_gpio *gpio = dev_get_drvdata(dev);
struct gpio_chip *gc = &gpio->ports[0].gc;
unsigned long flags;
int i;
int i, err;
clk_prepare_enable(gpio->clk);
err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
if (err) {
dev_err(gpio->dev, "Cannot reenable APB/Debounce clocks\n");
return err;
}
spin_lock_irqsave(&gc->bgpio_lock, flags);
for (i = 0; i < gpio->nr_ports; i++) {