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@xxxxxxxxxxx>
>>>>>>>
>>>>>>> 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@xxxxxxxxxxx>
>>>>>>> Co-developed-by: Wasim Nazir <wasim.nazir@xxxxxxxxxxxxxxxx>
>>>>>>> Signed-off-by: Wasim Nazir <wasim.nazir@xxxxxxxxxxxxxxxx>
>>>>>>> ---
>>>>>>> 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@87c4000 {
>>>>>>> + 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
