linux-kernel - Re: [PATCH 14/14] phy: qcom-qmp-combo: add support for updated sc8280xp binding

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Date:   Mon, 14 Nov 2022 13:58:29 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/14] phy: qcom-qmp-combo: add support for updated
 sc8280xp binding

On Sat, Nov 12, 2022 at 02:36:23PM +0300, Dmitry Baryshkov wrote:
> On 11/11/2022 12:24, Johan Hovold wrote:
> > Add support for the new SC8280XP binding.
> > 
> > Note that the binding does not try to describe every register subregion
> > and instead the driver holds the corresponding offsets.
> > 
> > Also note that (possibly) unlike on earlier platforms, the TX registers
> > are used by both the USB and DP implementation.
> > 
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 143 ++++++++++++++++++++--
> >   1 file changed, 133 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > index 0a4d53e6c586..544a7e55bf14 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > @@ -798,9 +798,25 @@ static const u8 qmp_dp_v5_voltage_swing_hbr_rbr[4][4] = {
> >   
> >   struct qmp_combo;
> >   
> > +struct qmp_combo_offsets {
> > +	u16 com;
> > +	u16 txa;
> > +	u16 rxa;
> > +	u16 txb;
> > +	u16 rxb;
> 
> 
> Yes, txa/txb are more in spite of the vendor headers. I'd sill suggest 
> to use tx/tx2 and rx/rx2 as used everywhere in the QMP driver.

I don't see any reason for making up names when we can use names that
match the hardware and do the conversion in one place when parsing the
devicetree.

If anything we should probably rename tx/tx2 at some point (as either
tx0/tx1 or txa/txb).

> > +	u16 usb3_serdes;
> > +	u16 usb3_pcs_misc;
> > +	u16 usb3_pcs;
> > +	u16 usb3_pcs_usb;
> > +	u16 dp_serdes;
> > +	u16 dp_dp_phy;
> > +};
> > +

Johan