linux-kernel - Re: [PATCH 2/2] ARM: dts: aspeed: Add KCS support for LPC BMC

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Message-ID: <584ddf6f-2e0c-5c1c-df06-bdd37ecd2489@linux.intel.com>
Date:   Tue, 11 Dec 2018 10:39:40 -0800
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Vijay Khemka <vijaykhemka@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     "openbmc @ lists . ozlabs . org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH 2/2] ARM: dts: aspeed: Add KCS support for LPC BMC

Hi Vijay,

On 12/10/2018 12:07 PM, Vijay Khemka wrote:
> Added kcs device support for lpc BMC.
> 
> Signed-off-by: Vijay Khemka <vijaykhemka@...com>
> ---
>   arch/arm/boot/dts/aspeed-g5.dtsi | 29 ++++++++++++++++++++++++++++-
>   1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
> index d107459fc0f8..1bd48655bacb 100644
> --- a/arch/arm/boot/dts/aspeed-g5.dtsi
> +++ b/arch/arm/boot/dts/aspeed-g5.dtsi
> @@ -330,8 +330,35 @@
>   				ranges = <0x0 0x1e789000 0x1000>;
>   
>   				lpc_bmc: lpc-bmc@0 {
> -					compatible = "aspeed,ast2500-lpc-bmc";
> +					compatible = "aspeed,ast2500-lpc-bmc, "simple-mfd", "syscon"";
>   					reg = <0x0 0x80>;
> +					reg-io-width = <4>;
> +
> +					#address-cells = <1>;
> +					#size-cells = <1>;
> +					ranges = <0x0 0x0 0x80>;
> +
> +					kcs1: kcs1@0 {
> +						compatible = "aspeed,ast2500-kcs-bmc";
> +						reg = <0x0 0x80>;

This reg property isn't needed at here because kcs_bmc_aspeed module
reads regmap from the parent node. Please check below code in the
driver code.

priv->map = syscon_node_to_regmap(dev->parent->of_node);

> +						interrupts = <8>;
> +						kcs_chan = <1>;
> +						status = "disabled";
> +					};
> +					kcs2: kcs2@0 {
> +						compatible = "aspeed,ast2500-kcs-bmc";
> +						reg = <0x0 0x80>;

ditto.

> +						interrupts = <8>;
> +						kcs_chan = <2>;
> +						status = "disabled";
> +					};
> +					kcs3: kcs3@0 {
> +						compatible = "aspeed,ast2500-kcs-bmc";
> +						reg = <0x0 0x80>;

ditto.

> +						interrupts = <8>;
> +						kcs_chan = <3>;
> +						status = "disabled";
> +					};
>   				};
>   
>   				lpc_host: lpc-host@80 {
> 

You might need to add kcs4 as a sub-node under lpc_host like below:

kcs4: kcs4@0 {
	compatible = "aspeed,ast2500-kcs-bmc";
	interrupts = <8>;
	kcs_chan = <4>;
	status = "disabled";
};

This would be uses as an SMM channel.

-Jae