linux-kernel - Re: [PATCH v5 2/5] ARM: dts: Remove LPC BMC and Host partitions

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Message-Id: <db4964a9-e78b-465b-850d-711c2a23e910@www.fastmail.com>
Date:   Mon, 25 Jan 2021 14:42:45 +1030
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Chia-Wei, Wang" <chiawei_wang@...eedtech.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Lee Jones" <lee.jones@...aro.org>,
        "Joel Stanley" <joel@....id.au>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Corey Minyard" <minyard@....org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        openbmc@...ts.ozlabs.org
Cc:     BMC-SW@...eedtech.com, "Haiyue Wang" <haiyue.wang@...ux.intel.com>,
        "Cyril Bur" <cyrilbur@...il.com>,
        "Robert Lippert" <rlippert@...gle.com>
Subject: Re: [PATCH v5 2/5] ARM: dts: Remove LPC BMC and Host partitions



On Thu, 14 Jan 2021, at 23:46, Chia-Wei, Wang wrote:
> The LPC controller has no concept of the BMC and the Host partitions.
> 
> A concrete instance is that the HICRB[5:4] are for the I/O port address
> configurtaion of KCS channel 1/2. However, the KCS driver cannot access
> HICRB for channel 1/2 initialization via syscon regmap interface due to
> the parition boundary. (i.e. offset 80h)
> 
> In addition, for the HW design backward compatibility, a newly added HW
> control bit could be located at any reserved one over the LPC addressing
> space. Thereby, this patch removes the lpc-bmc and lpc-host child node
> and thus the LPC partitioning.
> 
> Note that this change requires the synchronization between device tree
> change and the driver change. To prevent the misuse of old devicetrees
> with new drivers, or vice versa, the v2 compatible strings are adopted
> for the LPC device as listed:
> 
> 	"aspeed,ast2400-lpc-v2"
> 	"aspeed,ast2500-lpc-v2"
> 	"aspeed,ast2600-lpc-v2"
> 
> Signed-off-by: Chia-Wei, Wang <chiawei_wang@...eedtech.com>
> ---
>  arch/arm/boot/dts/aspeed-g4.dtsi |  74 +++++++----------
>  arch/arm/boot/dts/aspeed-g5.dtsi | 135 ++++++++++++++-----------------
>  arch/arm/boot/dts/aspeed-g6.dtsi | 135 ++++++++++++++-----------------

I've booted a Witherspoon BMC and host with these patches applied, so for 
aspeed-g5.dtsi:

Tested-by: Andrew Jeffery <andrew@...id.au>