linux-kernel - Re: [PATCH v9 2/4] phy: qcom-qmp-usb: add support for updated qcm2290 / sm6115 binding

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Date:   Tue, 2 May 2023 10:14:00 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-phy@...ts.infradead.org, agross@...nel.org,
        linux-kernel@...r.kernel.org, andersson@...nel.org,
        bhupesh.linux@...il.com, krzysztof.kozlowski@...aro.org,
        robh+dt@...nel.org, konrad.dybcio@...aro.org, kishon@...nel.org,
        vkoul@...nel.org, krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v9 2/4] phy: qcom-qmp-usb: add support for updated qcm2290
 / sm6115 binding

On Tue, 2 May 2023 at 05:43, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On 01/05/2023 22:24, Bhupesh Sharma wrote:
> > Add support for the new qcm2290 / sm6115 binding.
> >
> > The USB QMP phy on these devices supports 2 lanes. Also note that the
> > binding now does not describe every register subregion and instead
> > the driver holds the corresponding offsets. This also includes
> > the PCS_MISC region.
> >
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > ---
> >   drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 22 ++++++++++++++++++++++
> >   1 file changed, 22 insertions(+)
> >
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> > index a49711c5a63d..aa143c081805 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
> > @@ -1414,6 +1414,10 @@ struct qmp_usb_offsets {
> >       u16 pcs_usb;
> >       u16 tx;
> >       u16 rx;
> > +     /* for PHYs with >= 2 lanes */
> > +     u16 tx2;
> > +     u16 rx2;
> > +     u16 pcs_misc;
> >   };
> >
> >   /* struct qmp_phy_cfg - per-PHY initialization config */
> > @@ -1558,6 +1562,16 @@ static const char * const qmp_phy_vreg_l[] = {
> >       "vdda-phy", "vdda-pll",
> >   };
> >
> > +static const struct qmp_usb_offsets qmp_usb_offsets_v3 = {
> > +     .serdes         = 0,
> > +     .pcs            = 0xc00,
> > +     .tx             = 0x200,
> > +     .rx             = 0x400,
> > +     .tx2            = 0x600,
> > +     .rx2            = 0x800,
> > +     .pcs_misc       = 0xa00,
> > +};
> > +
> >   static const struct qmp_usb_offsets qmp_usb_offsets_v5 = {
> >       .serdes         = 0,
> >       .pcs            = 0x0200,
> > @@ -1922,6 +1936,8 @@ static const struct qmp_phy_cfg sm8350_usb3_uniphy_cfg = {
> >   static const struct qmp_phy_cfg qcm2290_usb3phy_cfg = {
> >       .lanes                  = 2,
> >
> > +     .offsets                = &qmp_usb_offsets_v3,
> > +
> >       .serdes_tbl             = qcm2290_usb3_serdes_tbl,
> >       .serdes_tbl_num         = ARRAY_SIZE(qcm2290_usb3_serdes_tbl),
> >       .tx_tbl                 = qcm2290_usb3_tx_tbl,
> > @@ -2497,6 +2513,12 @@ static int qmp_usb_parse_dt(struct qmp_usb *qmp)
> >       qmp->tx = base + offs->tx;
> >       qmp->rx = base + offs->rx;
> >
> > +     if (cfg->lanes >= 2) {
> > +             qmp->tx2 = base + offs->tx2;
> > +             qmp->rx2 = base + offs->rx2;
> > +             qmp->pcs_misc = base + offs->pcs_misc;
>
> pcs_misc should also be usable for a single-lane PHYs.

Ok. I will make it generic in the next version.

Thanks,
Bhupesh