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

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Message-ID: <tqm4sxoya3hue7mof3uqo4nu2b77ionmxi65ewfxtjouvn5xlt@d6ala2j2msbn>
Date: Thu, 4 Sep 2025 16:35:04 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Wasim Nazir <wasim.nazir@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....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 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.

-- 
With best wishes
Dmitry