linux-kernel - Re: [linux,dev-5.1 v1] dt-bindings: gpio: aspeed: Add SGPIO support

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Message-Id: <90c0c965-00ae-4f7a-a6f5-258572398bb0@www.fastmail.com>
Date:   Wed, 10 Jul 2019 11:30:14 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Rob Herring" <robh+dt@...nel.org>,
        "Hongwei Zhang" <hongweiz@....com>
Cc:     devicetree@...r.kernel.org, "Joel Stanley" <joel@....id.au>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Mark Rutland" <mark.rutland@....com>,
        linux-aspeed@...ts.ozlabs.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [linux,dev-5.1 v1] dt-bindings: gpio: aspeed: Add SGPIO support



On Wed, 10 Jul 2019, at 04:23, Rob Herring wrote:
> On Wed, Jul 3, 2019 at 2:01 PM Hongwei Zhang <hongweiz@....com> wrote:
> >
> > Add bindings to support SGPIO on AST2400 or AST2500.
> >
> > Signed-off-by: Hongwei Zhang <hongweiz@....com>
> > ---
> >  .../devicetree/bindings/gpio/sgpio-aspeed.txt      | 36 ++++++++++++++++++++++
> 
> Is this SGPIO as in the blinky lights for HDDs in servers? If so, that
> has nothing to do with Linux GPIO subsystem.
> 

No, this is just literal serialised GPIO, which can be used with e.g. nexperia
74LV595 / 74LV165 parts.

There is a separate chunk of IP in the SoC that acts as an SFF-8485 (blinky
lights) slave monitor.

Andrew