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Commit 064380a1 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Sebastian Reichel
Browse files

power/reset: at91-poweroff: get and use slow clock 



Commit dca1a4b5 ("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.

Get and use the slow clock as it is necessary for the at91 shutdown
controller.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
parent 6dd1ad1f

drivers/power/reset/at91-poweroff.c

+15 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
 * warranty of any kind, whether express or implied.

 */



#include <linux/clk.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>
@@ -48,6 +49,7 @@ static const char *shdwc_wakeup_modes[] = { 
};



static void __iomem *at91_shdwc_base;

static struct clk *sclk;



static void __init at91_wakeup_status(void)

{
@@ -122,6 +124,7 @@ static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev) 
static int __init at91_poweroff_probe(struct platform_device *pdev)

{

	struct resource *res;

	int ret;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res);
@@ -130,6 +133,16 @@ static int __init at91_poweroff_probe(struct platform_device *pdev) 
		return PTR_ERR(at91_shdwc_base);

	}



	sclk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(sclk))

		return PTR_ERR(sclk);



	ret = clk_prepare_enable(sclk);

	if (ret) {

		dev_err(&pdev->dev, "Could not enable slow clock\n");

		return ret;

	}



	at91_wakeup_status();



	if (pdev->dev.of_node)
@@ -145,6 +158,8 @@ static int __exit at91_poweroff_remove(struct platform_device *pdev) 
	if (pm_power_off == at91_poweroff)

		pm_power_off = NULL;



	clk_disable_unprepare(sclk);



	return 0;

}