linux-kernel - Re: [PATCH v1 5/9] phy: qcom-qmp: Get dp

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Date:   Wed, 26 Aug 2020 14:32:37 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, 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>,
        Manu Gautam <mgautam@...eaurora.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        Sean Paul <seanpaul@...omium.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v1 5/9] phy: qcom-qmp: Get dp_com I/O resource by index

Quoting Bjorn Andersson (2020-08-25 21:36:16)
> On Tue 25 Aug 21:47 CDT 2020, Stephen Boyd wrote:
> 
> > The dp_com resource is always at index 1 according to the dts files in
> > the kernel. Get this resource by index so that we don't need to make
> > future additions to the DT binding use 'reg-names'.
> > 
> 
> Afaict the DT binding for the USB/DP phy defines that there should be a
> reg name of "dp_com" and the current dts files all specifies this. Am I
> missing something?

Yes the binding enforces this but this patch is removing that
enforcement and instead mandating that dp_com is always at index 1 (i.e.
the second one) so that we can add the DP serdes region directly after
and avoid adding yet another reg-names property. I changed the binding
for this usb3-dp phy compatible to make reg-names optional as well. I
don't see any gain from using reg-names.

> 
> PS. Why isn't this a devm_platform_ioremap_resource{,_byname}()?

Sure. I'll roll that into this patch.