linux-kernel - Re: [PATCH 1/3] dt-bindings: aspeed-lpc: Document LPC Host Interface Controller

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Date:   Fri, 16 Feb 2018 15:34:19 +1030
From:   Andrew Jeffery <andrew@...id.au>
To:     Joel Stanley <joel@....id.au>, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cyril Bur <cyrilbur@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Lei YU <mine260309@...il.com>
Subject: Re: [PATCH 1/3] dt-bindings: aspeed-lpc: Document LPC Host
 Interface Controller

On Mon, 2018-02-12 at 17:38 +1030, Joel Stanley wrote:
> The LPC Host Interface Controller is part of a BMC SoC that is used for
> communication with the host.
> 
> Signed-off-by: Joel Stanley <joel@....id.au>
> ---
>  .../devicetree/bindings/mfd/aspeed-lpc.txt         | 40 ++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> index 514d82ced95b..94a31de109c4 100644
> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> @@ -109,6 +109,46 @@ lpc: lpc@...89000 {
>  	};
>  };
>  
> +BMC Node Children
> +==================
> +
> +LPC Host Interface Controller

This should be under the Host Node Children header given the
function's position in the MMIO layout and the split prescribed by the
bindings.

> +-------------------
> +
> +The LPC Host Interface Controller manages functions exposed to the host such as
> +LPC firmware hub cycles, configuration of the LPC-to-AHB mapping, UART
> +management and bus snoop configuration.
> +
> +Required properties:
> +
> +- compatible:	One of:
> +		"aspeed,ast2400-lpc-ctrl";
> +		"aspeed,ast2500-lpc-ctrl";
> +
> +- reg:		contains offset/length values of the host interface controller
> +		memory regions
> +
> +- clocks:	contains a phandle to the syscon node describing the clocks.
> +		There should then be one cell representing the clock to use
> +
> +- memory-region: A phandle to a reserved_memory region to be used for the LPC
> +		to AHB mapping
> +
> +- flash:	A phandle to the SPI flash controller containing the flash to
> +		be exposed over the LPC to AHB mapping
> +
> +Example:
> +
> +lpc-host@80 {
> +	lpc_ctrl: lpc-ctrl@0 {
> +		compatible = "aspeed,ast2500-lpc-ctrl";
> +		reg = <0x0 0x80>;
> +		clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
> +		memory-region = <&flash_memory>;
> +		flash = <&spi>;
> +	};
> +};

ACK wrt the content, just need to fix its location.

> +
>  Host Node Children
>  ==================
>  
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