linux-kernel - Re: [PATCH 5/7] arm64: tegra: Add Memory controller DT node on T194

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Date:   Fri, 30 Aug 2019 13:18:10 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krishna Reddy <vdumpa@...dia.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, treding@...dia.com, yhsu@...dia.com,
        snikam@...dia.com, praithatha@...dia.com, talho@...dia.com,
        avanbrunt@...dia.com, thomasz@...dia.com, olof@...om.net,
        jtukkinen@...dia.com, mperttunen@...dia.com
Subject: Re: [PATCH 5/7] arm64: tegra: Add Memory controller DT node on T194

On Thu, Aug 29, 2019 at 03:47:05PM -0700, Krishna Reddy wrote:
> Add Memory controller DT node on T194 and enable it.
> This patch is a prerequisite for SMMU enable on T194.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 ++++
>  arch/arm64/boot/dts/nvidia/tegra194.dtsi       | 7 +++++++
>  2 files changed, 11 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> index 62e07e11..4b3441b 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> @@ -47,6 +47,10 @@
>  			};
>  		};
>  
> +		memory-controller@...0000 {
> +			status = "okay";
> +		};
> +
>  		serial@...0000 {
>  			status = "okay";
>  		};
> diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> index adebbbf..d906958 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> @@ -6,6 +6,7 @@
>  #include <dt-bindings/reset/tegra194-reset.h>
>  #include <dt-bindings/power/tegra194-powergate.h>
>  #include <dt-bindings/thermal/tegra194-bpmp-thermal.h>
> +#include <dt-bindings/memory/tegra186-mc.h>
>  
>  / {
>  	compatible = "nvidia,tegra194";
> @@ -130,6 +131,12 @@
>  			};
>  		};
>  
> +		memory-controller@...0000 {
> +			compatible = "nvidia,tegra186-mc";

I think we need to make this "nvidia,tegra194-mc" and then enhance the
Tegra186 driver to match on that compatible string.

Nothing to worry about just yet and I can make that change when
applying.

Thierry

> +			reg = <0x02c00000 0xb0000>;
> +			status = "disabled";
> +		};
> +
>  		uarta: serial@...0000 {
>  			compatible = "nvidia,tegra194-uart", "nvidia,tegra20-uart";
>  			reg = <0x03100000 0x40>;
> -- 
> 2.1.4
> 

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