linux-kernel - Re: [PATCH v7 09/12] dt-bindings: PCI: qcom: Add SM8550 compatible

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Date:   Fri, 3 Feb 2023 12:35:28 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v7 09/12] dt-bindings: PCI: qcom: Add SM8550 compatible

On 23-02-03 11:03:05, Johan Hovold wrote:
> On Fri, Feb 03, 2023 at 10:18:04AM +0200, Abel Vesa wrote:
> > Add the SM8550 platform to the binding.
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > ---
> > 
> > This patchset relies on the following patchset:
> > https://lore.kernel.org/all/20230117224148.1914627-1-abel.vesa@linaro.org/
> > 
> > The v6 of this patch is:
> > https://lore.kernel.org/all/20230202123902.3831491-10-abel.vesa@linaro.org/
> > 
> > Changes since v6:
> >  * none
> > 
> > Changes since v5:
> >  * added Krzysztof's R-b tag
> > 
> > Changes since v4:
> >  * dropped _serdes infix from ln_shrd table name and from every ln_shrd
> >    variable name
> >  * added hyphen between "no CSR" in both places
> >  * dropped has_ln_shrd_serdes_tbl
> >  * reordered qmp_pcie_offsets_v6_20 by struct members
> >  * added rollback for no-CSR reset in qmp_pcie_init fail path
> >  * moved ln_shrd offset calculation after port_b
> >  * dropped the minItems for interconnects
> >  * made iommu related properties global
> >  * renamed noc_aggr_4 back to noc_aggr
> > 
> > Changes since v3:
> >  * renamed noc_aggr to noc_aggr_4, as found in the driver
> > 
> > Changes since v2:
> >  * dropped the pipe from clock-names
> >  * removed the pcie instance number from aggre clock-names comment
> >  * renamed aggre clock-names to noc_aggr
> >  * dropped the _pcie infix from cnoc_pcie_sf_axi
> >  * renamed pcie_1_link_down_reset to simply link_down
> >  * added enable-gpios back, since pcie1 node will use it
> > 
> > Changes since v1:
> >  * Switched to single compatible for both PCIes (qcom,pcie-sm8550)
> >  * dropped enable-gpios property
> >  * dropped interconnects related properties, the power-domains
> >  * properties
> >    and resets related properties the sm8550 specific allOf:if:then
> >  * dropped pipe_mux, phy_pipe and ref clocks from the sm8550 specific
> >    allOf:if:then clock-names array and decreased the minItems and
> >    maxItems for clocks property accordingly
> >  * added "minItems: 1" to interconnects, since sm8550 pcie uses just one,
> >    same for interconnect-names
>  
> > +  enable-gpios:
> > +    description: GPIO controlled connection to ENABLE# signal
> > +    maxItems: 1
> 
> What is this gpio used for? Describing it as "ENABLE#" looks wrong as
> AFAIK it's not part of the PCIe interface.

Oups, that should've been dropped here as well, as I did in the dts/dtsi
patches.

> 
> There's also no driver support being adding for this gpio as part of
> this series and you don't use it for either controller on the MTP.
> 
> Are you relying on firmware to enable this one currently perhaps?
> 
> > +
> >    perst-gpios:
> >      description: GPIO controlled connection to PERST# signal
> >      maxItems: 1
> 
> Johan