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.
--
With best wishes
Dmitry
