linux-kernel - Re: [PATCH] dt-bindings: Add a RISC-V SBI firmware node

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Message-ID: <20171120214520.dcaqvyncojwefmgt@rob-hp-laptop>
Date:   Mon, 20 Nov 2017 15:45:20 -0600
From:   Rob Herring <robh@...nel.org>
To:     Palmer Dabbelt <palmer@...ive.com>
Cc:     mark.rutland@....com, devicetree@...r.kernel.org,
        patches@...ups.riscv.org, linux-kernel@...r.kernel.org,
        nathan=20Neusch=C3=A4fer?= <j.neuschaefer@....net>
Subject: Re: [PATCH] dt-bindings: Add a RISC-V SBI firmware node

On Mon, Nov 20, 2017 at 11:50:00AM -0800, Palmer Dabbelt wrote:
> The RISC-V privileged ISA mandates the presence of an SBI, but there's
> no reason not to put it in the device tree.  This would allow us to
> possibly remove the SBI later.

If it is mandatory, then it should not be in DT. DT is not a driver 
instantiation mechanism.

If your ISA can vary, I'd recommend you make that discoverable. DT is 
for what we failed to make discoverable.

Rob