[PATCH 17/20] power/reset: at91-reset: get and use slow clock
From: Alexandre Belloni <hidden>
Date: 2015-07-30 00:24:28
Also in:
linux-pm, lkml
Subsystem:
system reset/shutdown drivers, the rest · Maintainers:
Sebastian Reichel, Linus Torvalds
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 <redacted>
---
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Dmitry Eremin-Solenikov <redacted>
Cc: linux-pm at vger.kernel.org
drivers/power/reset/at91-reset.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c
index 3e8f478385c1..cd277570af6e 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
@@ -199,6 +201,15 @@ static int at91_reset_probe(struct platform_device *pdev) { int ret; + 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 = at91_reset_of_probe(pdev); if (ret)
--
2.1.4