linux-kernel - Re: [PATCH v5 1/1] arm64: dts: qcom: ipq6018: add sdhci node

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Date: Thu, 7 Mar 2024 09:27:53 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Robert Marko <robimarko@...il.com>
Cc: Chukun Pan <amadeus@....edu.cn>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Rob Herring <robh@...nel.org>, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/1] arm64: dts: qcom: ipq6018: add sdhci node

On Wed, 6 Mar 2024 at 22:35, Robert Marko <robimarko@...il.com> wrote:
>
>
> On 06. 03. 2024. 20:43, Dmitry Baryshkov wrote:
> > On Wed, 6 Mar 2024 at 14:31, Chukun Pan <amadeus@....edu.cn> wrote:
> >> Add node to support mmc controller inside of IPQ6018.
> >> This controller supports both eMMC and SD cards.
> >>
> >> Tested with:
> >>    eMMC (HS200)
> >>    SD Card (SDR50/SDR104)
> >>
> >> Signed-off-by: Chukun Pan <amadeus@....edu.cn>
> >> ---
> >>   arch/arm64/boot/dts/qcom/ipq6018.dtsi | 19 +++++++++++++++++++
> >>   1 file changed, 19 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> >> index 322eced0b876..420c192bccd9 100644
> >> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> >> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> >> @@ -441,6 +441,25 @@ dwc_1: usb@...0000 {
> >>                          };
> >>                  };
> >>
> >> +               sdhc: mmc@...4000 {
> >> +                       compatible = "qcom,ipq6018-sdhci", "qcom,sdhci-msm-v5";
> >> +                       reg = <0x0 0x07804000 0x0 0x1000>,
> >> +                             <0x0 0x07805000 0x0 0x1000>;
> >> +                       reg-names = "hc", "cqhci";
> >> +
> >> +                       interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>,
> >> +                                    <GIC_SPI 138 IRQ_TYPE_LEVEL_HIGH>;
> >> +                       interrupt-names = "hc_irq", "pwr_irq";
> >> +
> >> +                       clocks = <&gcc GCC_SDCC1_AHB_CLK>,
> >> +                                <&gcc GCC_SDCC1_APPS_CLK>,
> >> +                                <&xo>;
> >> +                       clock-names = "iface", "core", "xo";
> >> +                       resets = <&gcc GCC_SDCC1_BCR>;
> >> +                       max-frequency = <192000000>;
> > If I understand correctly, GCC_SDCC1_APPS_CLK support frequencies up
> > to 384 MHz, but here you are limiting it to 192 MHz. Why is it so?
> >
> > I am not sure that 384MHz is actually supported as IPQ6018 datasheet
> > clearly indicates that HS400 mode is not supported.

I didn't check the datasheet, I opened the gcc-ipq6018.c

> >
> > Regards,
> > Robert
> >
> >> +                       status = "disabled";
> >> +               };
> >> +
> >>                  blsp_dma: dma-controller@...4000 {
> >>                          compatible = "qcom,bam-v1.7.0";
> >>                          reg = <0x0 0x07884000 0x0 0x2b000>;
> >> --
> >> 2.25.1
> >>
> >>
> >



-- 
With best wishes
Dmitry