diff options
| author | Sanchayan Maity <maitysanchayan@gmail.com> | 2014-11-07 18:34:28 +0530 |
|---|---|---|
| committer | Stefan Agner <stefan.agner@toradex.com> | 2014-11-19 10:39:40 +0100 |
| commit | 620899a047917abfca04facacc29e556776a4971 (patch) | |
| tree | 98372e2694ba008f11e276f45e9432906237a2cc /drivers | |
| parent | 3624a7ae3e5796cddf5d3700b83b441d7363d387 (diff) | |
drivers/rtc/rtc-snvs: Add clock support
This patch adds clock enable and disable support for
the SNVS peripheral, which is required for using the
RTC within the SNVS block.
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/rtc-snvs.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c index fa384fe28988..d4a651268174 100644 --- a/drivers/rtc/rtc-snvs.c +++ b/drivers/rtc/rtc-snvs.c @@ -17,6 +17,7 @@ #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/rtc.h> +#include <linux/clk.h> /* These register offsets are relative to LP (Low Power) range */ #define SNVS_LPCR 0x04 @@ -39,6 +40,7 @@ struct snvs_rtc_data { void __iomem *ioaddr; int irq; spinlock_t lock; + struct clk *clk; }; static u32 rtc_read_lp_counter(void __iomem *ioaddr) @@ -260,6 +262,18 @@ static int snvs_rtc_probe(struct platform_device *pdev) if (data->irq < 0) return data->irq; + data->clk = devm_clk_get(&pdev->dev, "snvs-rtc"); + if (IS_ERR(data->clk)) { + data->clk = NULL; + } else { + ret = clk_prepare_enable(data->clk); + if (ret) { + dev_err(&pdev->dev, + "Could not prepare or enable the snvs clock\n"); + return ret; + } + } + platform_set_drvdata(pdev, data); spin_lock_init(&data->lock); @@ -280,7 +294,7 @@ static int snvs_rtc_probe(struct platform_device *pdev) if (ret) { dev_err(&pdev->dev, "failed to request irq %d: %d\n", data->irq, ret); - return ret; + goto error_rtc_device_register; } data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, @@ -288,10 +302,16 @@ static int snvs_rtc_probe(struct platform_device *pdev) if (IS_ERR(data->rtc)) { ret = PTR_ERR(data->rtc); dev_err(&pdev->dev, "failed to register rtc: %d\n", ret); - return ret; + goto error_rtc_device_register; } return 0; + +error_rtc_device_register: + if (data->clk) + clk_disable_unprepare(data->clk); + + return ret; } #ifdef CONFIG_PM_SLEEP @@ -302,16 +322,26 @@ static int snvs_rtc_suspend(struct device *dev) if (device_may_wakeup(dev)) enable_irq_wake(data->irq); + if (data->clk) + clk_disable_unprepare(data->clk); + return 0; } static int snvs_rtc_resume(struct device *dev) { struct snvs_rtc_data *data = dev_get_drvdata(dev); + int ret; if (device_may_wakeup(dev)) disable_irq_wake(data->irq); + if (data->clk) { + ret = clk_prepare_enable(data->clk); + if (ret) + return ret; + } + return 0; } #endif |