linux-kernel - Re: [PATCH 1/2] usb: usb3503: add PM functions

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Date:	Mon, 14 Jul 2014 13:57:15 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Joonyoung Shim <jy0922.shim@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, broonie@...aro.org, tobetter@...il.com
Subject: Re: [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@...sung.com>

Acked-by: Marek Szyprowski <m.szyprowski@...sung.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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