linux-kernel - Re: [PATCH V4 2/2] dt-bindings: mailbox: add doorbell support to ARM MHU

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Message-ID: <CAK8P3a1o5Ey9KVPW0Tk+bOCH_TC8PgbO=Oh3Lgm=kHEioUtgpw@mail.gmail.com>
Date:   Wed, 16 Sep 2020 13:02:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Herring <robh@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 2/2] dt-bindings: mailbox: add doorbell support to ARM MHU

On Wed, Sep 16, 2020 at 11:39 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> From: Sudeep Holla <sudeep.holla@....com>
>
> The ARM MHU's reference manual states following:
>
> "The MHU drives the signal using a 32-bit register, with all 32 bits
> logically ORed together. The MHU provides a set of registers to enable
> software to set, clear, and check the status of each of the bits of this
> register independently.  The use of 32 bits for each interrupt line
> enables software to provide more information about the source of the
> interrupt. For example, each bit of the register can be associated with
> a type of event that can contribute to raising the interrupt."
>
> This patch thus extends the MHU controller's DT binding to add support
> for doorbell mode.
>
> Though the same MHU hardware controller is used in the two modes, A new
> compatible string is added here to represent the combination of the MHU
> hardware and the firmware sitting on the other side (which expects each
> bit to represent a different signal now).
>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Co-developed-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Acked-by: Arnd Bergmann <arnd@...db.de>