diff options
| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2015-08-11 12:12:48 +0300 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2015-09-22 16:18:52 +0300 |
| commit | 2b2c6148fe851042cefbf272146b77634a4da39d (patch) | |
| tree | 8988ea9ab2c0b3869f2f400a29cdfc33d1cb0cd6 /drivers/power | |
| parent | 6e64180a7c0219d769e05b6dbe5af4a073c1eb92 (diff) | |
| download | linux-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.c | 17 |
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; } |