linux-kernel - Re: [PATCH 2/7] dt-bindings: bus: add ASR8751C APB/AXI bindings

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Date:   Sun, 31 Mar 2019 01:41:30 -0500
From:   Rob Herring <robh@...nel.org>
To:     qiaozhou <qiaozhou@...micro.com>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] dt-bindings: bus: add ASR8751C APB/AXI bindings

On Sat, Mar 23, 2019 at 10:01:23PM +0800, qiaozhou wrote:
> From: Qiao Zhou <qiaozhou@...micro.com>
> 
> Add binding documentation for ASR8751C AXI/APB bus that are used
> to interface with peripherals. AXI/APB bus follow standard AXI/APB
> protocols.
> 
> Signed-off-by: qiaozhou <qiaozhou@...micro.com>
> ---
>  Documentation/devicetree/bindings/bus/asr,bus.txt | 42 +++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/asr,bus.txt
> 
> diff --git a/Documentation/devicetree/bindings/bus/asr,bus.txt b/Documentation/devicetree/bindings/bus/asr,bus.txt
> new file mode 100644
> index 0000000..cbb1b6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/asr,bus.txt
> @@ -0,0 +1,42 @@
> +* ASR AXI/APB Simple Bus
> +
> +This file documents core properties in ASR AXI and APB bus.
> +
> +The ASR8751C SoC has APB and AXI buses for cores to access its
> +controllers, suchas i2c, sdh, rtc, clock, power management registers

s/suchas/such as/

> +etc. Most ASR SoCs share the common architecture for buses.
> +Generally APB and AXI bus have a source clock and power control, and
> +clock rate can be changed and power can be shutdown in low power mode.

Then where are the clocks?

> +
> +Required properties for AXI bus:
> +- compatible: should be "asr,axi-bus", "simple-bus".
> +- #address-cells: could be 1, or 2
> +- #size-cells: could be 1, or 2
> +- reg: iomem address of AXI bus registers
> +- ranges: register ranges
> +
> +Example:
> +	axi@...00000 {	/* AXI */
> +		compatible = "asr,axi-bus", "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		reg = <0 0xd4200000 0 0x00200000>;
> +		ranges = <0 0 0 0xffffffff>;
> +
> +	};
> +
> +Required properties for APB bus:
> +- compatible: should be "asr,apb-bus", "simple-bus".
> +- #address-cells: could be 1, or 2
> +- #size-cells: could be 1, or 2
> +- reg: iomem address of APB bus registers
> +- ranges: register ranges
> +
> +Example:
> +	apb@...00000 {	/* APB */
> +		compatible = "asr,apb-bus", "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		reg = <0 0xd4000000 0 0x00200000>;
> +		ranges = <0 0 0 0xffffffff>;
> +	};
> -- 
> 2.7.4
>