linux-kernel - Re: [PATCH v2] usb: host: ehci-platform: add support for optional external vbus supply

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Date:   Tue, 20 Feb 2018 15:02:41 +0200
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Amelie Delaunay <amelie.delaunay@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tony Prisk <linux@...sktech.co.nz>,
        Alan Stern <stern@...land.harvard.edu>
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Amelie Delaunay <amelie.delaunay@...com>
Subject: Re: [PATCH v2] usb: host: ehci-platform: add support for optional external vbus supply


Hi,

Amelie Delaunay <amelie.delaunay@...com> writes:
> On some boards, especially when vbus supply requires large current,
> and the charge pump on the PHY isn't enough, an external vbus power switch
> may be used.
> Add support for this optional external vbus supply in ehci-platform.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
>
> ---
> Changes in v2:
>  * Address Roger Quadros comments: move regulator_enable/disable from
> ehci_platform_power_on/off to ehci_platform_port_power.
> ---
>  Documentation/devicetree/bindings/usb/usb-ehci.txt |  1 +
>  drivers/usb/host/ehci-platform.c                   | 31 ++++++++++++++++++++++
>  2 files changed, 32 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> index 3efde12..fc480cd 100644
> --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> @@ -19,6 +19,7 @@ Optional properties:
>   - phys : phandle + phy specifier pair
>   - phy-names : "usb"
>   - resets : phandle + reset specifier pair
> + - vbus-supply : phandle of regulator supplying vbus
>  
>  Example (Sequoia 440EPx):
>      ehci@...00300 {
> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
> index b065a96..05be100 100644
> --- a/drivers/usb/host/ehci-platform.c
> +++ b/drivers/usb/host/ehci-platform.c
> @@ -29,6 +29,7 @@
>  #include <linux/of.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/reset.h>
>  #include <linux/usb.h>
>  #include <linux/usb/hcd.h>
> @@ -46,6 +47,7 @@ struct ehci_platform_priv {
>  	struct reset_control *rsts;
>  	struct phy **phys;
>  	int num_phys;
> +	struct regulator *vbus_supply;
>  	bool reset_on_resume;
>  };
>  
> @@ -76,6 +78,25 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
>  	return 0;
>  }
>  
> +static int ehci_platform_port_power(struct usb_hcd *hcd, int portnum,
> +				    bool enable)
> +{
> +	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
> +	int ret = 0;
> +
> +	if (priv->vbus_supply) {

you can reduce indentation here:

	if (!priv->vbus_supply)
        	return 0;

-- 
balbi