Pekon Gupta <pekon@xxxxxx> writes:
> From: avinash philip <avinashphilip@xxxxxx>
>
> In low power modes of AM335X platforms, peripherals power is cut off.
> This patch supports low power sleep transition support for ELM driver.
This series needs a bit more description about what "low power sleep
transition" is, and how adding runtime PM calls makes this transition
happen.
Kevin
> Signed-off-by: Philip Avinash <avinashphilip@xxxxxx>
> Signed-off-by: Pekon Gupta <pekon@xxxxxx>
> ---
> drivers/mtd/devices/elm.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
> index dccef9f..171efcd 100644
> --- a/drivers/mtd/devices/elm.c
> +++ b/drivers/mtd/devices/elm.c
> @@ -20,6 +20,7 @@
> #include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/of.h>
> +#include <linux/sched.h>
> #include <linux/pm_runtime.h>
> #include <linux/platform_data/elm.h>
>
> @@ -385,6 +386,23 @@ static int elm_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static int elm_suspend(struct device *dev)
> +{
> + pm_runtime_put_sync(dev);
> + return 0;
> +}
> +
> +static int elm_resume(struct device *dev)
> +{
> + struct elm_info *info = dev_get_drvdata(dev);
> +
> + pm_runtime_get_sync(dev);
> + elm_config(dev, info->bch_type);
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(elm_pm_ops, elm_suspend, elm_resume);
> +
> #ifdef CONFIG_OF
> static const struct of_device_id elm_of_match[] = {
> { .compatible = "ti,am3352-elm" },
> @@ -398,6 +416,7 @@ static struct platform_driver elm_driver = {
> .name = "elm",
> .owner = THIS_MODULE,
> .of_match_table = of_match_ptr(elm_of_match),
> + .pm = &elm_pm_ops,
> },
> .probe = elm_probe,
> .remove = elm_remove,
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