linux-kernel - Re: [RFC v4 2/2] dt-bindings: mmc: sdhci-msm: Add interconnect BW scaling strings

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Message-ID: <20200308215100.GM1094083@builder>
Date:   Sun, 8 Mar 2020 14:51:00 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Pradeep P V K <ppvk@...eaurora.org>
Cc:     adrian.hunter@...el.com, robh+dt@...nel.org,
        ulf.hansson@...aro.org, asutoshd@...eaurora.org,
        stummala@...eaurora.org, sayalil@...eaurora.org,
        rampraka@...eaurora.org, vbadigan@...eaurora.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, mka@...omium.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, linux-mmc-owner@...r.kernel.org
Subject: Re: [RFC v4 2/2] dt-bindings: mmc: sdhci-msm: Add interconnect BW
 scaling strings

On Tue 18 Feb 05:00 PST 2020, Pradeep P V K wrote:

> Add interconnect bandwidth scaling supported strings for qcom-sdhci
> controller.
> 
> Signed-off-by: Pradeep P V K <ppvk@...eaurora.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
> 
> changes from RFC v3 -> v4:
> - No changes.
> 
>  Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> index 7ee639b..cbe97b8 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> @@ -40,6 +40,21 @@ Required properties:
>  	"cal"	- reference clock for RCLK delay calibration (optional)
>  	"sleep"	- sleep clock for RCLK delay calibration (optional)
>  
> +Optional Properties:
> +* Following bus parameters are required for interconnect bandwidth scaling:
> +- interconnects: Pairs of phandles and interconnect provider specifier
> +		 to denote the edge source and destination ports of
> +		 the interconnect path.
> +
> +- interconnect-names: For sdhc, we have two main paths.
> +		1. Data path : sdhc to ddr
> +		2. Config path : cpu to sdhc
> +		For Data interconnect path the name supposed to be
> +		is "sdhc-ddr" and for config interconnect path it is
> +		"cpu-sdhc".
> +		Please refer to Documentation/devicetree/bindings/
> +		interconnect/ for more details.
> +
>  Example:
>  
>  	sdhc_1: sdhci@...24900 {
> @@ -57,6 +72,9 @@ Example:
>  
>  		clocks = <&gcc GCC_SDCC1_APPS_CLK>, <&gcc GCC_SDCC1_AHB_CLK>;
>  		clock-names = "core", "iface";
> +		interconnects = <&qnoc MASTER_SDCC_ID &qnoc SLAVE_DDR_ID>,
> +				<&qnoc MASTER_CPU_ID &qnoc SLAVE_SDCC_ID>;
> +		interconnect-names = "sdhc-ddr","cpu-sdhc";
>  	};
>  
>  	sdhc_2: sdhci@...a4900 {
> -- 
> 1.9.1
>