Re: [PATCH] ARM: dts: add "simple-bus" to "arm,amba-bus" compatible nodes

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On Tue, Mar 01, 2016 at 12:57:00PM +0900, Masahiro Yamada wrote:
> The "arm,amba-bus" string in the of_default_bus_match_table is
> ambiguous.  This prepares for killing it off in a long run.

I don't follow the purpose of this patch.

There's no way we can remove kernel-side support for "arm,amba-bus", as
there are DTBs that rely on it.

If we're going to merge "arm,amba-bus" in the kernel with "simple-bus",
such that there is no distinction between the two, then that doesn't
require any DTBs to be updated.

The only reason I would see for changing dts files would be a subsequent
clean-up for consistency, but at that point "arm,amba-bus" could be
dropped entirely.

So this patch makes no sense to me.

Thanks,
Mark.

> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> ---
> 
>  arch/arm/boot/dts/axm55xx.dtsi             | 2 +-
>  arch/arm/boot/dts/exynos3250.dtsi          | 2 +-
>  arch/arm/boot/dts/exynos4.dtsi             | 2 +-
>  arch/arm/boot/dts/exynos4415.dtsi          | 2 +-
>  arch/arm/boot/dts/exynos5250.dtsi          | 2 +-
>  arch/arm/boot/dts/exynos5420.dtsi          | 2 +-
>  arch/arm/boot/dts/exynos5440.dtsi          | 2 +-
>  arch/arm/boot/dts/hi3620.dtsi              | 2 +-
>  arch/arm/boot/dts/hip01.dtsi               | 2 +-
>  arch/arm/boot/dts/hisi-x5hd2.dtsi          | 2 +-
>  arch/arm/boot/dts/qcom-apq8064.dtsi        | 2 +-
>  arch/arm/boot/dts/qcom-msm8660.dtsi        | 2 +-
>  arch/arm/boot/dts/qcom-msm8960.dtsi        | 2 +-
>  arch/arm/boot/dts/rk3036.dtsi              | 2 +-
>  arch/arm/boot/dts/rk3228.dtsi              | 2 +-
>  arch/arm/boot/dts/rk3288.dtsi              | 2 +-
>  arch/arm/boot/dts/rk3xxx.dtsi              | 2 +-
>  arch/arm/boot/dts/s5pv210.dtsi             | 2 +-
>  arch/arm/boot/dts/socfpga.dtsi             | 2 +-
>  arch/arm/boot/dts/socfpga_arria10.dtsi     | 2 +-
>  arch/arm/boot/dts/ste-nomadik-stn8815.dtsi | 2 +-
>  arch/arm/boot/dts/ste-u300.dts             | 2 +-
>  arch/arm/boot/dts/versatile-ab.dts         | 2 +-
>  23 files changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/axm55xx.dtsi b/arch/arm/boot/dts/axm55xx.dtsi
> index ea288f0..8da4582 100644
> --- a/arch/arm/boot/dts/axm55xx.dtsi
> +++ b/arch/arm/boot/dts/axm55xx.dtsi
> @@ -107,7 +107,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <2>;
>  			#size-cells = <2>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 18e3def..0ad4fa7 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -381,7 +381,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/exynos4.dtsi b/arch/arm/boot/dts/exynos4.dtsi
> index 045785c..d53fd78 100644
> --- a/arch/arm/boot/dts/exynos4.dtsi
> +++ b/arch/arm/boot/dts/exynos4.dtsi
> @@ -661,7 +661,7 @@
>  	amba {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		interrupt-parent = <&gic>;
>  		ranges;
>  
> diff --git a/arch/arm/boot/dts/exynos4415.dtsi b/arch/arm/boot/dts/exynos4415.dtsi
> index ad76484..35d2f99 100644
> --- a/arch/arm/boot/dts/exynos4415.dtsi
> +++ b/arch/arm/boot/dts/exynos4415.dtsi
> @@ -380,7 +380,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			interrupt-parent = <&gic>;
> diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
> index 33e2d5f..bcaed08 100644
> --- a/arch/arm/boot/dts/exynos5250.dtsi
> +++ b/arch/arm/boot/dts/exynos5250.dtsi
> @@ -674,7 +674,7 @@
>  	amba {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		interrupt-parent = <&gic>;
>  		ranges;
>  
> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index 48a0a55..838bde3 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -327,7 +327,7 @@
>  	amba {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		interrupt-parent = <&gic>;
>  		ranges;
>  
> diff --git a/arch/arm/boot/dts/exynos5440.dtsi b/arch/arm/boot/dts/exynos5440.dtsi
> index f18b51f..5fe5639 100644
> --- a/arch/arm/boot/dts/exynos5440.dtsi
> +++ b/arch/arm/boot/dts/exynos5440.dtsi
> @@ -200,7 +200,7 @@
>  	amba {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		interrupt-parent = <&gic>;
>  		ranges;
>  	};
> diff --git a/arch/arm/boot/dts/hi3620.dtsi b/arch/arm/boot/dts/hi3620.dtsi
> index 6cbb62e..7b67ffe 100644
> --- a/arch/arm/boot/dts/hi3620.dtsi
> +++ b/arch/arm/boot/dts/hi3620.dtsi
> @@ -68,7 +68,7 @@
>  
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		interrupt-parent = <&gic>;
>  		ranges = <0 0xfc000000 0x2000000>;
>  
> diff --git a/arch/arm/boot/dts/hip01.dtsi b/arch/arm/boot/dts/hip01.dtsi
> index 33130f8..0835627 100644
> --- a/arch/arm/boot/dts/hip01.dtsi
> +++ b/arch/arm/boot/dts/hip01.dtsi
> @@ -43,7 +43,7 @@
>  		amba {
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			ranges;
>  
>  			uart0: uart@10001000 {
> diff --git a/arch/arm/boot/dts/hisi-x5hd2.dtsi b/arch/arm/boot/dts/hisi-x5hd2.dtsi
> index c52722b..f3a79b7 100644
> --- a/arch/arm/boot/dts/hisi-x5hd2.dtsi
> +++ b/arch/arm/boot/dts/hisi-x5hd2.dtsi
> @@ -34,7 +34,7 @@
>  		amba {
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			ranges;
>  
>  			timer0: timer@00002000 {
> diff --git a/arch/arm/boot/dts/qcom-apq8064.dtsi b/arch/arm/boot/dts/qcom-apq8064.dtsi
> index ed521e8..ca93486 100644
> --- a/arch/arm/boot/dts/qcom-apq8064.dtsi
> +++ b/arch/arm/boot/dts/qcom-apq8064.dtsi
> @@ -721,7 +721,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/qcom-msm8660.dtsi b/arch/arm/boot/dts/qcom-msm8660.dtsi
> index e5f7f33..e05773c 100644
> --- a/arch/arm/boot/dts/qcom-msm8660.dtsi
> +++ b/arch/arm/boot/dts/qcom-msm8660.dtsi
> @@ -167,7 +167,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/qcom-msm8960.dtsi b/arch/arm/boot/dts/qcom-msm8960.dtsi
> index 51a40d8..7e7e891 100644
> --- a/arch/arm/boot/dts/qcom-msm8960.dtsi
> +++ b/arch/arm/boot/dts/qcom-msm8960.dtsi
> @@ -251,7 +251,7 @@
>  		};
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/rk3036.dtsi b/arch/arm/boot/dts/rk3036.dtsi
> index b9567c1..c15fdf4 100644
> --- a/arch/arm/boot/dts/rk3036.dtsi
> +++ b/arch/arm/boot/dts/rk3036.dtsi
> @@ -94,7 +94,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/rk3228.dtsi b/arch/arm/boot/dts/rk3228.dtsi
> index 119ff12..8b4e443 100644
> --- a/arch/arm/boot/dts/rk3228.dtsi
> +++ b/arch/arm/boot/dts/rk3228.dtsi
> @@ -96,7 +96,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 8ac49f3..af111fa 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -134,7 +134,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/rk3xxx.dtsi b/arch/arm/boot/dts/rk3xxx.dtsi
> index 99eeea7..c969e84 100644
> --- a/arch/arm/boot/dts/rk3xxx.dtsi
> +++ b/arch/arm/boot/dts/rk3xxx.dtsi
> @@ -67,7 +67,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/s5pv210.dtsi b/arch/arm/boot/dts/s5pv210.dtsi
> index 8344a0e..e945c343 100644
> --- a/arch/arm/boot/dts/s5pv210.dtsi
> +++ b/arch/arm/boot/dts/s5pv210.dtsi
> @@ -130,7 +130,7 @@
>  		amba {
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			ranges;
>  
>  			pdma0: dma@e0900000 {
> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> index 3ed4abd..cadc637 100644
> --- a/arch/arm/boot/dts/socfpga.dtsi
> +++ b/arch/arm/boot/dts/socfpga.dtsi
> @@ -69,7 +69,7 @@
>  		ranges;
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/socfpga_arria10.dtsi b/arch/arm/boot/dts/socfpga_arria10.dtsi
> index cce9e50..06a8e86 100644
> --- a/arch/arm/boot/dts/socfpga_arria10.dtsi
> +++ b/arch/arm/boot/dts/socfpga_arria10.dtsi
> @@ -63,7 +63,7 @@
>  		ranges;
>  
>  		amba {
> -			compatible = "arm,amba-bus";
> +			compatible = "arm,amba-bus", "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			ranges;
> diff --git a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
> index 27a333e..74732e4 100644
> --- a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
> +++ b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
> @@ -721,7 +721,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/ste-u300.dts b/arch/arm/boot/dts/ste-u300.dts
> index 9c73ac2..763a607 100644
> --- a/arch/arm/boot/dts/ste-u300.dts
> +++ b/arch/arm/boot/dts/ste-u300.dts
> @@ -384,7 +384,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> diff --git a/arch/arm/boot/dts/versatile-ab.dts b/arch/arm/boot/dts/versatile-ab.dts
> index 6fd7efb..01156cf 100644
> --- a/arch/arm/boot/dts/versatile-ab.dts
> +++ b/arch/arm/boot/dts/versatile-ab.dts
> @@ -148,7 +148,7 @@
>  	};
>  
>  	amba {
> -		compatible = "arm,amba-bus";
> +		compatible = "arm,amba-bus", "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
> -- 
> 1.9.1
> 
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