[PATCH 18/20] power/reset: at91-poweroff: get and use slow clock
From: Alexandre Belloni <hidden>
Date: 2015-07-30 00:23:38
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 shutdown
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-poweroff.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
index 9847cfb7e23d..fadd1a41729b 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 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 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)
--
2.1.4