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

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Message-ID: <CA2566BA-428C-4D5A-8B37-835638252B0C@fb.com>
Date:   Tue, 11 Dec 2018 18:55:40 +0000
From:   Vijay Khemka <vijaykhemka@...com>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.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" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.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

Thanks Jay,
I will take care of your comments and send next version.

Regards
-Vijay

On 12/11/18, 10:40 AM, "Jae Hyun Yoo" <jae.hyun.yoo@...ux.intel.com> wrote:

    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