linux-kernel - Re: [PATCH v4 1/8] dt-bindings: add img,pvrsgx.yaml for Imagination GPUs

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Date:   Wed, 18 Dec 2019 15:16:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        openpvrsgx-devgroup@...ux.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-mips@...r.kernel.org
Subject: Re: [PATCH v4 1/8] dt-bindings: add img,pvrsgx.yaml for Imagination
 GPUs

On Tue, Dec 17, 2019 at 07:01:59PM +0100, H. Nikolaus Schaller wrote:
> The Imagination PVR/SGX GPU is part of several SoC from
> multiple vendors, e.g. TI OMAP, Ingenic JZ4780, Intel Poulsbo
> and others.
> 
> With this binding, we describe how the SGX processor is
> interfaced to the SoC (registers, interrupt etc.).
> 
> In most cases, Clock, Reset and power management is handled
> by a parent node or elsewhere.
> 
> Tested by make dt_binding_check dtbs_check

I'm surprised that worked... (Not for long if it did).

> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  .../devicetree/bindings/gpu/img,pvrsgx.yaml   | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/img,pvrsgx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpu/img,pvrsgx.yaml b/Documentation/devicetree/bindings/gpu/img,pvrsgx.yaml
> new file mode 100644
> index 000000000000..44799774e34d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/img,pvrsgx.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpu/img,pvrsgx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Imagination PVR/SGX GPU
> +
> +maintainers:
> +  - H. Nikolaus Schaller <hns@...delico.com>
> +
> +description: |+
> +  This binding describes the Imagination SGX5 series of 3D accelerators which
> +  are found in several different SoC like TI OMAP, Sitara, Ingenic JZ4780,
> +  Allwinner A83, and Intel Poulsbo and CedarView and more.
> +
> +  For an almost complete list see: https://en.wikipedia.org/wiki/PowerVR#Implementations
> +  
> +  Only the Imagination SGX530, SGX540 and SGX544 GPUs are currently covered by
> +  this binding but the extension of the pattern is straightforward.
> +  
> +  The SGX node is usually a child node of some DT node belonging to the SoC
> +  which handles clocks, reset and general address space mapping of the SGX
> +  register area.
> +
> +properties:
> +  compatible:
> +    enum:
> +    # Example: BeagleBoard A/B/C, OpenPandora 600MHz
> +      - ti,omap3-sgx530-121, img,sgx530-121, img,sgx530

Didn't I comment before this is not valid. You are defining the 
compatible string is: 'ti,omap3-sgx530-121, img,sgx530-121, img,sgx530'

You need:

compatible:
  oneOf:
    - description: BeagleBoard A/B/C, OpenPandora 600MHz
      items:
        - const: ti,omap3-sgx530-121
        - const: img,sgx530-121
        - const: img,sgx530

And so on for each of the rest.

> +    # Example: BeagleBoard XM, GTA04, OpenPandora 1GHz
> +      - ti,omap3-sgx530-125, img,sgx530-125, img,sgx530
> +    # Example: BeagleBone Black
> +      - ti,am3352-sgx530-125, img,sgx530-125, img,sgx530

These 2 could be combined using 'enum' for the first item. Basically, 
you can group ones where the last 2 strings are the same.

> +    # Example: Pandaboard, Pandaboard ES
> +      - ti,omap4-sgx540-120, img,sgx540-120, img,sgx540
> +      - ti,omap4-sgx544-112, img,sgx544-112, img,sgx544
> +    # Example: OMAP5 UEVM, Pyra Handheld
> +      - ti,omap5-sgx544-116, img,sgx544-116, img,sgx544
> +      - ti,dra7-sgx544-116, img,sgx544-116, img,sgx544
> +    # Example: CI20
> +      - ingenic,jz4780-sgx540-120, img,sgx540-120, img,sgx540
> +    # the following entries are not validated with real hardware

What am I supposed to do with that? You're just defining some strings. 
If you're not sure they are okay, then don't define them.

> +    # more TI SoC
> +      - ti,am3517-sgx530-125, img,sgx530-125, img,sgx530
> +      - ti,am4-sgx530-125, img,sgx530-125, img,sgx530
> +      - ti,ti81xx-sgx530-125, img,sgx530-125, img,sgx530
> +    # Example: Banana-Pi-M3 (Allwinner A83T)
> +      - allwinner,sun8i-a83t-sgx544-116, img,sgx544-116, img,sgx544
> +    # Example: Atom Z5xx
> +      - intel,poulsbo-gma500-sgx535, img,sgx535-116, img,sgx535
> +    # Example: Atom Z24xx
> +      - intel,medfield-gma-sgx540, img,sgx540-116, img,sgx540
> +    # Example: Atom N2600, D2500
> +      - intel,cedarview-gma3600-sgx545, img,sgx545-116, img,sgx545
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |+
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    gpu@...0 {
> +      compatible = "ti,omap-omap5-sgx544-116", "img,sgx544-116", "img,sgx544", "img,sgx5";

Doesn't match the schema.

> +      reg = <0xfe00 0x200>;
> +      interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> +
> +...
> -- 
> 2.23.0
>