linux-kernel - Re: [PATCH v7 3/5] phy: Add set

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Message-ID: <5884715D.7050709@ti.com>
Date:   Sun, 22 Jan 2017 14:16:21 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Stephen Boyd <stephen.boyd@...aro.org>,
        Peter Chen <peter.chen@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
        <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v7 3/5] phy: Add set_vbus callback

Hi,

On Saturday 21 January 2017 12:20 AM, Stephen Boyd wrote:
> Some USB PHYs need to be told about vbus changing state
> explicitly. For example the qcom USB HS PHY needs to toggle a bit
> when vbus goes from low to high (VBUSVLDEXT) to cause the
> "session valid" signal to toggle. This signal will pull up D+
> when the phy starts running. If the vbus signal isn't routed to
> the PHY this "session valid" signal won't ever toggle, so we have
> to toggle it explicitly. This callback is used to do that.
> 
> Cc: Peter Chen <peter.chen@....com>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
> 
> New patch
> 
>  drivers/phy/phy-core.c  | 15 +++++++++++++++
>  include/linux/phy/phy.h | 10 ++++++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index a268f4d6f3e9..8b1a6bfa5133 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -357,6 +357,21 @@ int phy_set_mode(struct phy *phy, enum phy_mode mode)
>  }
>  EXPORT_SYMBOL_GPL(phy_set_mode);
>  
> +int phy_set_vbus(struct phy *phy, int on)
> +{
> +	int ret;
> +
> +	if (!phy || !phy->ops->set_vbus)
> +		return 0;
> +
> +	mutex_lock(&phy->mutex);
> +	ret = phy->ops->set_vbus(phy, on);
> +	mutex_unlock(&phy->mutex);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_set_vbus);
> +
>  int phy_reset(struct phy *phy)
>  {
>  	int ret;
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index 78bb0d7f6b11..4d1ebde7fb14 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -36,6 +36,7 @@ enum phy_mode {
>   * @power_on: powering on the phy
>   * @power_off: powering off the phy
>   * @set_mode: set the mode of the phy
> + * @set_vbus: enable/disable vbus in the phy (USB)
>   * @reset: resetting the phy
>   * @owner: the module owner containing the ops
>   */
> @@ -45,6 +46,7 @@ struct phy_ops {
>  	int	(*power_on)(struct phy *phy);
>  	int	(*power_off)(struct phy *phy);
>  	int	(*set_mode)(struct phy *phy, enum phy_mode mode);
> +	int	(*set_vbus)(struct phy *phy, int on);

please avoid adding usb specific ops in generic phy ops.

Thanks
Kishon