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gpio: vf610: add optional clock support 

Some SoCs need the gpio clock to be enabled before accessing
HW registers. This patch add the optional clock handling.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
A.s. Dong 2018-11-10 14:21:18 +00:00 committed by Linus Walleij
parent 1a5287a3db
commit 91393622bc
1 changed files with 44 additions and 0 deletions
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44
drivers/gpio/gpio-vf610.c
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@ -7,6 +7,7 @@
* Author: Stefan Agner <stefan@agner.ch>.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
@ -32,6 +33,8 @@ struct vf610_gpio_port {
void __iomem *gpio_base;
const struct fsl_gpio_soc_data *sdata;
u8 irqc[VF610_GPIO_PER_PORT];
struct clk *clk_port;
struct clk *clk_gpio;
int irq;
};
@ -271,6 +274,33 @@ static int vf610_gpio_probe(struct platform_device *pdev)
if (port->irq < 0)
return port->irq;
port->clk_port = devm_clk_get(&pdev->dev, "port");
if (!IS_ERR(port->clk_port)) {
ret = clk_prepare_enable(port->clk_port);
if (ret)
return ret;
} else if (port->clk_port == ERR_PTR(-EPROBE_DEFER)) {
/*
* Percolate deferrals, for anything else,
* just live without the clocking.
*/
return PTR_ERR(port->clk_port);
}
port->clk_gpio = devm_clk_get(&pdev->dev, "gpio");
if (!IS_ERR(port->clk_gpio)) {
ret = clk_prepare_enable(port->clk_gpio);
if (ret) {
clk_disable_unprepare(port->clk_port);
return ret;
}
} else if (port->clk_gpio == ERR_PTR(-EPROBE_DEFER)) {
clk_disable_unprepare(port->clk_port);
return PTR_ERR(port->clk_gpio);
}
platform_set_drvdata(pdev, port);
gc = &port->gc;
gc->of_node = np;
gc->parent = dev;
@ -305,12 +335,26 @@ static int vf610_gpio_probe(struct platform_device *pdev)
return 0;
}
static int vf610_gpio_remove(struct platform_device *pdev)
{
struct vf610_gpio_port *port = platform_get_drvdata(pdev);
gpiochip_remove(&port->gc);
if (!IS_ERR(port->clk_port))
clk_disable_unprepare(port->clk_port);
if (!IS_ERR(port->clk_gpio))
clk_disable_unprepare(port->clk_gpio);
return 0;
}
static struct platform_driver vf610_gpio_driver = {
.driver = {
.name = "gpio-vf610",
.of_match_table = vf610_gpio_dt_ids,
},
.probe = vf610_gpio_probe,
.remove = vf610_gpio_remove,
};
builtin_platform_driver(vf610_gpio_driver);