netdev - Re: [PATCH 2/5] arm64: dts: qcom: lemans: Add SDHC controller and SDC pin configuration

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Message-ID: <aLmwRSROlgXxw3bI@hu-wasimn-hyd.qualcomm.com>
Date: Thu, 4 Sep 2025 20:59:09 +0530
From: Wasim Nazir <wasim.nazir@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Richard Cochran <richardcochran@...il.com>, kernel@....qualcomm.com,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, Monish Chunara <quic_mchunara@...cinc.com>
Subject: Re: [PATCH 2/5] arm64: dts: qcom: lemans: Add SDHC controller and
 SDC pin configuration

On Thu, Sep 04, 2025 at 04:34:05PM +0200, Konrad Dybcio wrote:
> On 9/4/25 3:35 PM, Dmitry Baryshkov wrote:
> > On Wed, Sep 03, 2025 at 09:58:33PM +0530, Wasim Nazir wrote:
> >> On Wed, Sep 03, 2025 at 06:12:59PM +0200, Konrad Dybcio wrote:
> >>> On 8/27/25 3:20 AM, Dmitry Baryshkov wrote:
> >>>> On Tue, Aug 26, 2025 at 11:51:01PM +0530, Wasim Nazir wrote:
> >>>>> From: Monish Chunara <quic_mchunara@...cinc.com>
> >>>>>
> >>>>> Introduce the SDHC v5 controller node for the Lemans platform.
> >>>>> This controller supports either eMMC or SD-card, but only one
> >>>>> can be active at a time. SD-card is the preferred configuration
> >>>>> on Lemans targets, so describe this controller.
> >>>>>
> >>>>> Define the SDC interface pins including clk, cmd, and data lines
> >>>>> to enable proper communication with the SDHC controller.
> >>>>>
> >>>>> Signed-off-by: Monish Chunara <quic_mchunara@...cinc.com>
> >>>>> Co-developed-by: Wasim Nazir <wasim.nazir@....qualcomm.com>
> >>>>> Signed-off-by: Wasim Nazir <wasim.nazir@....qualcomm.com>
> >>>>> ---
> >>>>>  arch/arm64/boot/dts/qcom/lemans.dtsi | 70 ++++++++++++++++++++++++++++++++++++
> >>>>>  1 file changed, 70 insertions(+)
> >>>>>
> >>>>> diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
> >>>>> index 99a566b42ef2..a5a3cdba47f3 100644
> >>>>> --- a/arch/arm64/boot/dts/qcom/lemans.dtsi
> >>>>> +++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
> >>>>> @@ -3834,6 +3834,36 @@ apss_tpdm2_out: endpoint {
> >>>>>  			};
> >>>>>  		};
> >>>>>  
> >>>>> +		sdhc: mmc@...4000 {
> >>>>> +			compatible = "qcom,sa8775p-sdhci", "qcom,sdhci-msm-v5";
> >>>>> +			reg = <0x0 0x087c4000 0x0 0x1000>;
> >>>>> +
> >>>>> +			interrupts = <GIC_SPI 383 IRQ_TYPE_LEVEL_HIGH>,
> >>>>> +				     <GIC_SPI 521 IRQ_TYPE_LEVEL_HIGH>;
> >>>>> +			interrupt-names = "hc_irq", "pwr_irq";
> >>>>> +
> >>>>> +			clocks = <&gcc GCC_SDCC1_AHB_CLK>,
> >>>>> +				 <&gcc GCC_SDCC1_APPS_CLK>;
> >>>>> +			clock-names = "iface", "core";
> >>>>> +
> >>>>> +			interconnects = <&aggre1_noc MASTER_SDC 0 &mc_virt SLAVE_EBI1 0>,
> >>>>> +					<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_SDC1 0>;
> >>>>> +			interconnect-names = "sdhc-ddr", "cpu-sdhc";
> >>>>> +
> >>>>> +			iommus = <&apps_smmu 0x0 0x0>;
> >>>>> +			dma-coherent;
> >>>>> +
> >>>>> +			resets = <&gcc GCC_SDCC1_BCR>;
> >>>>> +
> >>>>> +			no-sdio;
> >>>>> +			no-mmc;
> >>>>> +			bus-width = <4>;
> >>>>
> >>>> This is the board configuration, it should be defined in the EVK DTS.
> >>>
> >>> Unless the controller is actually incapable of doing non-SDCards
> >>>
> >>> But from the limited information I can find, this one should be able
> >>> to do both
> >>>
> >>
> >> It’s doable, but the bus width differs when this controller is used for
> >> eMMC, which is supported on the Mezz board. So, it’s cleaner to define
> >> only what’s needed for each specific usecase on the board.
> > 
> > `git grep no-sdio arch/arm64/boot/dts/qcom/` shows that we have those
> > properties inside the board DT. I don't see a reason to deviate.
> 
> Just to make sure we're clear
> 
> I want the author to keep bus-width in SoC dt and move the other
> properties to the board dt
> 

I'll move the no-sdio and no-mmc properties to the board-specific device
tree file, and keep the bus-width configuration in the SoC-level file.


-- 
Regards,
Wasim