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

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Date:	Thu, 30 Oct 2014 17:40:15 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Roman Byshko <rbyshko@...il.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,

On Wed, Oct 29, 2014 at 10:24:12AM +0800, Chen-Yu Tsai wrote:
> On Wed, Oct 29, 2014 at 5:47 AM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi Roman,
> >
> > Thanks for your patches
> >
> > On Mon, Oct 27, 2014 at 10:43:01PM +0100, Roman Byshko wrote:
> >> The driver for sun4i USB phys currently supports
> >> only phy1 and phy2 which are used for USB host
> >> controllers. This patch adds support for USB phy0,
> >> which is used by the musb hdrc USB controller.
> >
> > Like Andreas already pointed out, your signed-off-by is missing from
> > all your patches.
> >
> >> ---
> >>  drivers/phy/phy-sun4i-usb.c | 9 ++++++---
> >>  1 file changed, 6 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> >> index 0baf5ef..a24728b 100644
> >> --- a/drivers/phy/phy-sun4i-usb.c
> >> +++ b/drivers/phy/phy-sun4i-usb.c
> >> @@ -157,6 +157,10 @@ static int sun4i_usb_phy_init(struct phy *_phy)
> >>               return ret;
> >>       }
> >>
> >> +     /* 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.

That would make a great comment ;)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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