diff options
| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2015-08-11 11:12:50 +0200 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2015-09-22 15:18:53 +0200 |
| commit | 064380a12e12412f25db049a503126228babbae5 (patch) | |
| tree | db3e1034ffb2f560e1c69e74eb8015dba80aeef3 /drivers/power | |
| parent | 6dd1ad1f236e7e683e92efd6b5b3953615900701 (diff) | |
power/reset: at91-poweroff: 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 shutdown
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-poweroff.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c index 3e698d916c4f..e9e24df35f26 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 __init 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 __init 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) @@ -145,6 +158,8 @@ static int __exit at91_poweroff_remove(struct platform_device *pdev) if (pm_power_off == at91_poweroff) pm_power_off = NULL; + clk_disable_unprepare(sclk); + return 0; } |