linux-kernel - Re: [PATCH 5/5] arm64: dts: qcom: sc7180: Update Q6V5 MSS node

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Message-ID: <20200420055005.GI1516868@builder.lan>
Date:   Sun, 19 Apr 2020 22:50:05 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     agross@...nel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, evgreen@...omium.org,
        ohad@...ery.com, mka@...omium.org, dianders@...omium.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: qcom: sc7180: Update Q6V5 MSS node

On Fri 17 Apr 07:26 PDT 2020, Sibi Sankar wrote:

> Add TCSR node and update MSS node to support MSA based Modem boot on
> SC7180 SoCs.
> 
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
> 
> Depends on the following bindings:
> iommus: https://patchwork.kernel.org/patch/11443101/
> spare-regs: https://patchwork.kernel.org/patch/11491425/
> 
>  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 42 +++++++++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sc7180.dtsi    |  5 +++
>  2 files changed, 47 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> index e613d70cc0198..6f472872be1a3 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> @@ -319,6 +319,48 @@ &qupv3_id_1 {
>  	status = "okay";
>  };
>  
> +&remoteproc_mpss {
> +	compatible = "qcom,sc7180-mss-pil";
> +	reg = <0 0x04080000 0 0x410>, <0 0x04180000 0 0x48>;

I think we should overspecify the properties in the platform dtsi,
whenever possible - it shouldn't be a problem that the pas driver
doesn't use all the properties provided by the binding.

As such I think you should move the reg, clocks, resets, halt regs and
power-domains to the platform.

> +	reg-names = "qdsp6", "rmb";
> +
> +	clocks = <&gcc GCC_MSS_CFG_AHB_CLK>,
> +		 <&gcc GCC_MSS_Q6_MEMNOC_AXI_CLK>,
> +		 <&gcc GCC_MSS_NAV_AXI_CLK>,
> +		 <&gcc GCC_MSS_SNOC_AXI_CLK>,
> +		 <&gcc GCC_MSS_MFAB_AXIS_CLK>,
> +		 <&rpmhcc RPMH_CXO_CLK>;
> +	clock-names = "iface", "bus", "nav", "snoc_axi",
> +		      "mnoc_axi", "xo";
> +
> +	iommus = <&apps_smmu 0x460 0x1>, <&apps_smmu 0x444 0x2>;
> +
> +	resets = <&aoss_reset AOSS_CC_MSS_RESTART>,
> +		 <&pdc_reset PDC_MODEM_SYNC_RESET>;
> +	reset-names = "mss_restart", "pdc_reset";
> +
> +	qcom,halt-regs = <&tcsr_mutex_regs 0x23000 0x25000 0x24000>;
> +	qcom,spare-regs = <&tcsr_regs 0xb3e4>;
> +
> +	power-domains = <&aoss_qmp AOSS_QMP_LS_MODEM>,
> +			<&rpmhpd SC7180_CX>,
> +			<&rpmhpd SC7180_MX>,
> +			<&rpmhpd SC7180_MSS>;
> +	power-domain-names = "load_state", "cx", "mx", "mss";
> +
> +	/delete-property/memory-region;
> +
> +	status = "okay";
> +
> +	mba {
> +		memory-region = <&mba_mem>;

When I wrote this I was under the impression that memory-region wasn't
allowed to take an array of regions, perhaps we can make the mss binding
and driver support a multi-cell memory-region in the of_node directly
and drop these sub children.

Then it would be a cleaner update of the pas' memory-region.

But I'm fine with us putting this part on the todo list for the time
being...

Regards,
Bjorn

> +	};
> +
> +	mpss {
> +		memory-region = <&mpss_mem>;
> +	};
> +};
> +
>  &uart3 {
>  	status = "okay";
>  
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index e319762a0bffc..c49801ddb9d70 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -981,6 +981,11 @@ tcsr_mutex_regs: syscon@...0000 {
>  			reg = <0 0x01f40000 0 0x40000>;
>  		};
>  
> +		tcsr_regs: syscon@...0000 {
> +			compatible = "syscon";
> +			reg = <0 0x01fc0000 0 0x40000>;
> +		};
> +
>  		tlmm: pinctrl@...0000 {
>  			compatible = "qcom,sc7180-pinctrl";
>  			reg = <0 0x03500000 0 0x300000>,
> -- 
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