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

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Commit dca1a4b5ff ("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: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Alexandre Belloni 2015-08-11 11:12:50 +02:00 committed by Sebastian Reichel
parent 6dd1ad1f23
commit 064380a12e
1 changed files with 15 additions and 0 deletions
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15
drivers/power/reset/at91-poweroff.c
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@ -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;
}