linux-kernel - Re: [PATCH v5 2/2] usb: chipidea: imx: Add binding to disable USB 60Mhz clock

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Message-ID: <20160923194728.GA7120@rob-hp-laptop>
Date:   Fri, 23 Sep 2016 14:47:28 -0500
From:   Rob Herring <robh@...nel.org>
To:     Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
Cc:     Peter.Chen@....com, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] usb: chipidea: imx: Add binding to disable USB
 60Mhz clock

On Wed, Sep 21, 2016 at 11:07:07AM +0200, Fabien Lahoudere wrote:
> This binding allow to disable the internal 60Mhz clock for USB host2 or
> host3.
> 
> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
> ---
>  Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt |  1 +
>  drivers/usb/chipidea/ci_hdrc_imx.c                     |  2 ++
>  drivers/usb/chipidea/ci_hdrc_imx.h                     |  1 +
>  drivers/usb/chipidea/usbmisc_imx.c                     | 13 +++++++++++++
>  4 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> index 0e03344..f83da66 100644
> --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> @@ -84,6 +84,7 @@ i.mx specific properties
>  - over-current-active-high: over current signal polarity is high active,
>    typically over current signal polarity is low active.
>  - external-vbus-divider: enables off-chip resistor divider for Vbus
> +- disable-int60ck: disable internal 60MHz clock for usb host2 or host3 on imx53

Doesn't this depend on something else like the type of phy connected? If 
not, when can you do this or not?

Rob