From 2b2c6148fe851042cefbf272146b77634a4da39d Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Tue, 11 Aug 2015 11:12:48 +0200 Subject: 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 Signed-off-by: Sebastian Reichel --- drivers/power/reset/at91-reset.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'drivers/power/reset/at91-reset.c') 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 #include #include #include @@ -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; } -- cgit v1.2.3-55-g7522