linux-hardening - Re: [PATCH v6 4/6] arm64: dts: qcom: sm6125: Add UFS nodes

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Date:   Mon, 9 Jan 2023 13:18:18 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Lux Aliaga <they@...t.lgbt>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, vkoul@...nel.org,
        kishon@...nel.org, alim.akhtar@...sung.com, avri.altman@....com,
        bvanassche@....org, keescook@...omium.org, tony.luck@...el.com,
        gpiccoli@...lia.com
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-scsi@...r.kernel.org, linux-hardening@...r.kernel.org,
        phone-devel@...r.kernel.org, martin.botka@...ainline.org,
        marijn.suijten@...ainline.org
Subject: Re: [PATCH v6 4/6] arm64: dts: qcom: sm6125: Add UFS nodes



On 8.01.2023 20:53, Lux Aliaga wrote:
> Adds a UFS host controller node and its corresponding PHY to
> the sm6125 platform.
> 
> Signed-off-by: Lux Aliaga <they@...t.lgbt>
> ---
>  arch/arm64/boot/dts/qcom/sm6125.dtsi | 57 ++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6125.dtsi b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> index df5453fcf2b9..cec7071d5279 100644
> --- a/arch/arm64/boot/dts/qcom/sm6125.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> @@ -511,6 +511,63 @@ sdhc_2: mmc@...4000 {
>  			status = "disabled";
>  		};
>  
> +		ufs_mem_hc: ufs@...4000 {
> +			compatible = "qcom,sm6125-ufshc", "qcom,ufshc", "jedec,ufs-2.0";
> +			reg = <0x04804000 0x3000>, <0x04810000 0x8000>;
You need reg-names for ICE to probe, otherwise the second reg sits unused.

> +			interrupts = <GIC_SPI 356 IRQ_TYPE_LEVEL_HIGH>;
> +			phys = <&ufs_mem_phy>;
> +			phy-names = "ufsphy";
> +			lanes-per-direction = <1>;
> +			#reset-cells = <1>;
> +			resets = <&gcc GCC_UFS_PHY_BCR>;
> +			reset-names = "rst";
> +			iommus = <&apps_smmu 0x200 0x0>;
> +
> +			clock-names = "core_clk",
> +				      "bus_aggr_clk",
> +				      "iface_clk",
> +				      "core_clk_unipro",
> +				      "ref_clk",
> +				      "tx_lane0_sync_clk",
> +				      "rx_lane0_sync_clk",
> +				      "ice_core_clk";
> +			clocks = <&gcc GCC_UFS_PHY_AXI_CLK>,
> +				 <&gcc GCC_SYS_NOC_UFS_PHY_AXI_CLK>,
> +				 <&gcc GCC_UFS_PHY_AHB_CLK>,
> +				 <&gcc GCC_UFS_PHY_UNIPRO_CORE_CLK>,
> +				 <&rpmcc RPM_SMD_XO_CLK_SRC>,
> +				 <&gcc GCC_UFS_PHY_TX_SYMBOL_0_CLK>,
> +				 <&gcc GCC_UFS_PHY_RX_SYMBOL_0_CLK>,
> +				 <&gcc GCC_UFS_PHY_ICE_CORE_CLK>;
> +			freq-table-hz = <50000000 240000000>,
> +					<0 0>,
> +					<0 0>,
> +					<37500000 150000000>,
> +					<0 0>,
> +					<0 0>,
> +					<0 0>,
> +					<75000000 300000000>;
> +
> +			status = "disabled";
> +		};
> +
> +		ufs_mem_phy: phy@...7000 {
> +			compatible = "qcom,sm6125-qmp-ufs-phy";
> +			reg = <0x04807000 0x1c4>;
Isn't this too small? Downstream says 0xdb8, but it's probably even bigger..
> +
> +			clock-names = "ref", "ref_aux";
We recently started an endless quest, trying to unify property
order [1], please adjust this to:

compat
reg
clocks
clock-names
[freq-table-hz seems fitting here tbf]
resets
reset-names
power-domains
#phy-cells
status

so in your case, put power-domains after reset-names and flip
clocks/clock-names

similarly for the node above this order would look good:

compat
reg
reg-names
interrupts
clocks
clock-names
resets
reset-names
reset-cells
phys
phy-names
lines-per-direction
iommus
status


Konrad 

[1] https://github.com/konradybcio-work/dt_review
> +			clocks = <&gcc GCC_UFS_MEM_CLKREF_CLK>, <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
> +
> +			power-domains = <&gcc UFS_PHY_GDSC>;
> +
> +			resets = <&ufs_mem_hc 0>;
> +			reset-names = "ufsphy";
> +
> +			#phy-cells = <0>;
> +
> +			status = "disabled";
> +		};
> +
>  		gpi_dma0: dma-controller@...0000 {
>  			compatible = "qcom,sm6125-gpi-dma", "qcom,sdm845-gpi-dma";
>  			reg = <0x04a00000 0x60000>;