linux-kernel - Re: [PATCH 1/5] phy: sun4i: add support for USB phy0

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Date:	Wed, 29 Oct 2014 14:46:34 +0100
From:	Roman Byshko <rbyshko@...il.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Mark Rutland <mark.rutland@....com>,
	devicetree <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/5] phy: sun4i: add support for USB phy0

Hi all,

sorry for missing Signed-offs, they will be added, of course.

>>> +     /* Regulation 45 ohms */
>>> +     if (phy->index == 0)
>>> +             sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
>>
>> What is this code supposed to do?
>>
>> Some define for this bit and/or a better comment would be nice.
>
> From Allwinner's sources: "Enable/Disable USB res45 Calibration"
>
> which I think refers to the internal 45 ohm termination resistors
> for the USB data lines. But I'm not an expert on USB hardware.

Same with me. I will however change the comment to make it more informative.

Thanks for your review,
Roman
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