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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-08-11 12:12:48 +0300
committerSebastian Reichel <sre@kernel.org>2015-09-22 16:18:52 +0300
commit2b2c6148fe851042cefbf272146b77634a4da39d (patch)
tree8988ea9ab2c0b3869f2f400a29cdfc33d1cb0cd6 /drivers/power
parent6e64180a7c0219d769e05b6dbe5af4a073c1eb92 (diff)
downloadlinux-2b2c6148fe851042cefbf272146b77634a4da39d.tar.xz
power/reset: at91-reset: get and use slow clock
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 reset controller. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/at91-reset.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c
index 6374f5c9ee91..3d9c43a66806 100644
--- a/drivers/power/reset/at91-reset.c
+++ b/drivers/power/reset/at91-reset.c
@@ -11,6 +11,7 @@
* warranty of any kind, whether express or implied.
*/
+#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
@@ -46,6 +47,7 @@ enum reset_type {
};
static void __iomem *at91_ramc_base[2], *at91_rstc_base;
+static struct clk *sclk;
/*
* unless the SDRAM is cleanly shutdown before we hit the
@@ -205,9 +207,21 @@ static int __init at91_reset_probe(struct platform_device *pdev)
match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
at91_restart_nb.notifier_call = match->data;
+ 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;
+ }
+
ret = register_restart_handler(&at91_restart_nb);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(sclk);
return ret;
+ }
at91_reset_status(pdev);
@@ -217,6 +231,7 @@ static int __init at91_reset_probe(struct platform_device *pdev)
static int __exit at91_reset_remove(struct platform_device *pdev)
{
unregister_restart_handler(&at91_restart_nb);
+ clk_disable_unprepare(sclk);
return 0;
}