linux-kernel - Re: [PATCH v2 08/10] phy: qcom-qmp: Add support for sc7180 DP phy

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Message-ID: <159959064579.454335.278344660530279025@swboyd.mtv.corp.google.com>
Date:   Tue, 08 Sep 2020 11:44:05 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Jonathan Marek <jonathan@...ek.ca>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        Vara Reddy <varar@...eaurora.org>,
        Tanmay Shah <tanmay@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        Sean Paul <seanpaul@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v2 08/10] phy: qcom-qmp: Add support for sc7180 DP phy

Quoting Jonathan Marek (2020-09-03 16:29:43)
> On 9/2/20 7:02 PM, Stephen Boyd wrote:
> 
> ...
> 
> > +static const struct qmp_phy_cfg sc7180_dpphy_cfg = {
> > +     .type                   = PHY_TYPE_DP,
> > +     .nlanes                 = 1,
> > +
> > +     .serdes_tbl             = qmp_v3_dp_serdes_tbl,
> > +     .serdes_tbl_num         = ARRAY_SIZE(qmp_v3_dp_serdes_tbl),
> > +     .tx_tbl                 = qmp_v3_dp_tx_tbl,
> > +     .tx_tbl_num             = ARRAY_SIZE(qmp_v3_dp_tx_tbl),
> > +
> > +     .serdes_tbl_rbr         = qmp_v3_dp_serdes_tbl_rbr,
> > +     .serdes_tbl_rbr_num     = ARRAY_SIZE(qmp_v3_dp_serdes_tbl_rbr),
> > +     .serdes_tbl_hbr         = qmp_v3_dp_serdes_tbl_hbr,
> > +     .serdes_tbl_hbr_num     = ARRAY_SIZE(qmp_v3_dp_serdes_tbl_hbr),
> > +     .serdes_tbl_hbr2        = qmp_v3_dp_serdes_tbl_hbr2,
> > +     .serdes_tbl_hbr2_num    = ARRAY_SIZE(qmp_v3_dp_serdes_tbl_hbr2),
> > +     .serdes_tbl_hbr3        = qmp_v3_dp_serdes_tbl_hbr3,
> > +     .serdes_tbl_hbr3_num    = ARRAY_SIZE(qmp_v3_dp_serdes_tbl_hbr3),
> > +
> > +     .clk_list               = qmp_v3_phy_clk_l,
> > +     .num_clks               = ARRAY_SIZE(qmp_v3_phy_clk_l),
> > +     .reset_list             = sc7180_usb3phy_reset_l,
> > +     .num_resets             = ARRAY_SIZE(sc7180_usb3phy_reset_l),
> > +     .vreg_list              = qmp_phy_vreg_l,
> > +     .num_vregs              = ARRAY_SIZE(qmp_phy_vreg_l),
> 
> You need a ".regs = qmp_v3_usb3phy_regs_layout," here, otherwise phy 
> init functions like qcom_qmp_phy_serdes_init() can crash on a NULL 
> reference.
> 

Ah got it. I didn't see a problem because the USB phy probes first for
me.