linux-kernel - Re: [PATCH v5 6/8] dt-bindings: i2c: iproc: add "brcm,iproc-nic-i2c" compatible string

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Message-ID: <20190402101757.GC2960@kunai>
Date:   Tue, 2 Apr 2019 12:17:57 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
Subject: Re: [PATCH v5 6/8] dt-bindings: i2c: iproc: add "brcm,iproc-nic-i2c"
 compatible string


> Note APE is a co-processor that is not visible from the Linux running
> from the host processor.
> 
> "brcm,iproc-nic-i2c" here is introduced to allow the I2C port from APE
> to be completely owned by the host CPU, to meet the requirement of
> certain use cases. At the same time, the control of the I2C port from
> APE will be disabled.
> 
> The "brcm,ape-hsls-addr-mask" defines the address translation and be
> programmed into some configuration registers to allow the host to
> directly access the I2C registers of APE. Note those configuration
> registers are owned by the host, and that address is not APE's address
> space nor the host is intending to take over the control of APE.
> 
> Therefore, I think it makes way more sense to use an address mask type
> of DT property here.

Thanks for the explanation! Well, since Rob is already OK with it, then
so am I.


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