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Subject[PATCH v3 5/5] power/reset: at91-poweroff: get and use slow clock
Date
Commit dca1a4b5ff6e ("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>
---
drivers/power/reset/at91-poweroff.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
index 3e698d916c4f..e9e24df35f26 100644
--- a/drivers/power/reset/at91-poweroff.c
+++ b/drivers/power/reset/at91-poweroff.c
@@ -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;
}

--
2.1.4


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