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SubjectRe: [PATCH 1/2] usb: usb3503: add PM functions
Hello,

On 2014-07-10 07:22, Joonyoung Shim wrote:
> The usb3503 needs to switch to standby mode while suspending and should
> switch to hub mode when resumed. Also we can control clock on PM
> function.
>
> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
> drivers/usb/misc/usb3503.c | 34 ++++++++++++++++++++++++++++++++--
> 1 file changed, 32 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
> index 652855b..47cb143 100644
> --- a/drivers/usb/misc/usb3503.c
> +++ b/drivers/usb/misc/usb3503.c
> @@ -149,8 +149,6 @@ static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
>
> case USB3503_MODE_STANDBY:
> usb3503_reset(hub, 0);
> -
> - hub->mode = mode;
> dev_info(dev, "switched to STANDBY mode\n");
> break;
>
> @@ -347,6 +345,37 @@ static int usb3503_platform_probe(struct platform_device *pdev)
> return usb3503_probe(hub);
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int usb3503_i2c_suspend(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct usb3503 *hub = i2c_get_clientdata(client);
> +
> + usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
> +
> + if (hub->clk)
> + clk_disable_unprepare(hub->clk);
> +
> + return 0;
> +}
> +
> +static int usb3503_i2c_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct usb3503 *hub = i2c_get_clientdata(client);
> +
> + if (hub->clk)
> + clk_prepare_enable(hub->clk);
> +
> + usb3503_switch_mode(hub, hub->mode);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
> + usb3503_i2c_resume);
> +
> static const struct i2c_device_id usb3503_id[] = {
> { USB3503_I2C_NAME, 0 },
> { }
> @@ -365,6 +394,7 @@ MODULE_DEVICE_TABLE(of, usb3503_of_match);
> static struct i2c_driver usb3503_i2c_driver = {
> .driver = {
> .name = USB3503_I2C_NAME,
> + .pm = &usb3503_i2c_pm_ops,
> .of_match_table = of_match_ptr(usb3503_of_match),
> },
> .probe = usb3503_i2c_probe,

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland



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