linux-kernel - RE: [PATCH v2 1/5] dt-bindings: aspeed: Add eSPI controller

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Date:   Mon, 23 Aug 2021 01:21:15 +0000
From:   ChiaWei Wang <chiawei_wang@...eedtech.com>
To:     Rob Herring <robh@...nel.org>
CC:     "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: RE: [PATCH v2 1/5] dt-bindings: aspeed: Add eSPI controller

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Saturday, August 21, 2021 4:02 AM
> To: ChiaWei Wang <chiawei_wang@...eedtech.com>
> Cc: joel@....id.au; andrew@...id.au; linux-aspeed@...ts.ozlabs.org;
> openbmc@...ts.ozlabs.org; devicetree@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Ryan Chen
> <ryan_chen@...eedtech.com>
> Subject: Re: [PATCH v2 1/5] dt-bindings: aspeed: Add eSPI controller
> 
> On Thu, Aug 19, 2021 at 04:00:36PM +0800, Chia-Wei Wang wrote:
> > Add dt-bindings for Aspeed eSPI controller
> >
> > Signed-off-by: Chia-Wei Wang <chiawei_wang@...eedtech.com>
> > ---
> >  .../devicetree/bindings/soc/aspeed/espi.yaml  | 158
> > ++++++++++++++++++
> >  1 file changed, 158 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> > b/Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> > new file mode 100644
> > index 000000000000..fec3d37f3ffd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/aspeed/espi.yaml
> > @@ -0,0 +1,158 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) # #
> > +Copyright (c) 2021 Aspeed Technology Inc.
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/soc/aspeed/espi.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: Aspeed eSPI Controller
> > +
> > +maintainers:
> > +  - Chia-Wei Wang <chiawei_wang@...eedtech.com>
> > +  - Ryan Chen <ryan_chen@...eedtech.com>
> > +
> > +description:
> > +  Aspeed eSPI controller implements a slave side eSPI endpoint device
> > +  supporting the four eSPI channels, namely peripheral, virtual wire,
> > +  out-of-band, and flash.
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - aspeed,ast2500-espi
> > +          - aspeed,ast2600-espi
> > +      - const: simple-mfd
> > +      - const: syscon
> 
> Is this really 2 sub devices that could be used individually or in a different
> combination? If not, then I'd make all this 1 node.

espi-mmbi has individual function and control registers.
However, espi-mmbi is also a feature extended based on the memory cycle of eSPI peripheral channel.
Thereby, it has dependency on the eSPI channel initialization conducted by espi-ctrl.
The scenario is similar to the lpc-ctrl and other lpc-xxx drivers of Aspeed SoCs.

Chiawei