linux-kernel - Re: [PATCH v2 1/5] dt-bindings: platform: microsoft: Document surface xbl

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Date:   Tue, 16 Nov 2021 08:17:49 -0800
From:   Jarrett Schultz <jaschultzms@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        linux-arm-msm@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Jarrett Schultz <jaschultz@...rosoft.com>
Subject: Re: [PATCH v2 1/5] dt-bindings: platform: microsoft: Document
 surface xbl

On Fri, Nov 12, 2021 at 08:39:24AM -0600, Rob Herring wrote:
> On Mon, Nov 08, 2021 at 08:44:45AM -0800, Jarrett Schultz wrote:
> > Introduce yaml for surface xbl driver.
> > 
> > Signed-off-by: Jarrett Schultz <jaschultz@...rosoft.com>
> 
> Author and Sob emails need to match.
> 
> > 
> > ---
> > 
> > Changes in v2:
> >  - Removed json-schema dependence
> >  - Elaborated on description of driver
> >  - Updated example
> > 
> > ---
> > 
> >  .../platform/microsoft/surface-xbl.yaml       | 57 +++++++++++++++++++
> >  MAINTAINERS                                   |  7 +++
> >  2 files changed, 64 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/platform/microsoft/surface-xbl.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/platform/microsoft/surface-xbl.yaml b/Documentation/devicetree/bindings/platform/microsoft/surface-xbl.yaml
> > new file mode 100644
> > index 000000000000..09f806f373bd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/platform/microsoft/surface-xbl.yaml
> > @@ -0,0 +1,57 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/platform/microsoft/surface-xbl.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Surface Extensible Bootloader for Microsoft Surface Duo
> > +
> > +maintainers:
> > +  - Jarrett Schultz <jaschultzMS@...il.com>
> > +
> > +description: |
> > +  Exposes the following device information to user space via sysfs -
> 
> What's sysfs? :) Linux details don't go in bindings.
> 
> > +    * board_id
> > +    * battery_present
> > +    * hw_init_retries
> > +    * is_customer_mode
> > +    * is_act_mode
> > +    * pmic_reset_reason
> > +    * touch_fw_version
> > +    * ocp_error_location
> > +  See sysfs documentation for more information.
> > +
> > +properties:
> > +  compatible:
> > +    const: microsoft,sm8150-surface-duo-xbl
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +unevaluatedProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +
> > +examples:
> > +  - |
> > +    xbl@...bfa94 {
> > +      compatible = "microsoft,sm8150-surface-duo-xbl";
> > +      reg = <0x00 0x146bfa94 0x00 0x100>;
> > +    };
> > +  - |
> > +    imem@...bf000 {
> > +      compatible = "simple-mfd";
> 
> 'simple-mfd' needs a specific compatible for the block.
> 

Is there any need to describe the inner "xbl@a94" binding? If so, could
you point me in the right direction?

> > +      reg = <0x0 0x146bf000 0x0 0x1000>;
> > +      ranges = <0x0 0x0 0x146bf000 0x1000>;
> > +
> > +      #address-cells = <1>;
> > +      #size-cells = <1>;
> > +
> > +      xbl@a94 {
> > +        compatible = "microsoft,sm8150-surface-duo-xbl";
> > +        reg = <0xa94 0x100>;
> > +      };
> > +    };
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index eeb4c70b3d5b..8643546f8fab 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -12423,6 +12423,13 @@ F:	Documentation/driver-api/surface_aggregator/clients/dtx.rst
> >  F:	drivers/platform/surface/surface_dtx.c
> >  F:	include/uapi/linux/surface_aggregator/dtx.h
> >  
> > +MICROSOFT SURFACE DUO XBL DRIVER
> > +M:	Jarrett Schultz <jaschultz@...rosoft.com>
> > +L:	linux-arm-msm@...r.kernel.org
> > +L:	platform-driver-x86@...r.kernel.org
> > +S:	Supported
> > +F:	Documentation/devicetree/bindings/platform/microsoft/surface-xbl.yaml
> > +
> >  MICROSOFT SURFACE GPE LID SUPPORT DRIVER
> >  M:	Maximilian Luz <luzmaximilian@...il.com>
> >  L:	platform-driver-x86@...r.kernel.org
> > -- 
> > 2.25.1
> > 
> >