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 <[email protected]> --- drivers/power/reset/at91-poweroff.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) 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; } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
