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

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Message-ID: <57ae28ea-85fd-4f8b-8e74-1efba33f0cd2@oss.qualcomm.com>
Date: Fri, 5 Sep 2025 13:14:29 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Wasim Nazir <wasim.nazir@....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 9/4/25 7:32 PM, Dmitry Baryshkov wrote:
> 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 think bus-width is also a property of the board. In the end, it's a
> question of schematics whether we route 1 wire or all 4 wires. git-log
> shows that bus-width is being sent in both files (and probalby we should
> sort that out).

Actually this is the controller capability, so if it can do 8, it should
be 8 and the MMC core will do whatever it pleases (the not-super-sure
docs that I have say 8 for this platform)

Konrad