linux-kernel - Re: [PATCH 2/3] dt-bindings: remoteproc: Add AVM WASP

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Message-ID: <CAE9cyGRcDSJwrKOWER9wxHSAQzLs2ZdL+uWsme0etMV+8wKcMg@mail.gmail.com>
Date:   Tue, 22 Feb 2022 16:27:45 +0100
From:   Kestrel seventyfour <kestrelseventyfour@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: remoteproc: Add AVM WASP

Am Mo., 21. Feb. 2022 um 17:47 Uhr schrieb Krzysztof Kozlowski
<krzk@...nel.org>:
>
> On 21/02/2022 14:53, Daniel Kestrel wrote:
> > AVM Fritzbox router boards may contain an additional ATH79
> > based SoC that has the wifi cards connected.
> > This patch adds bindings for this remote processor.
> >
> > Signed-off-by: Daniel Kestrel <kestrelseventyfour@...il.com>
> > ---
> >  .../bindings/remoteproc/avm,wasp-rproc.yaml   | 93 +++++++++++++++++++
> >  1 file changed, 93 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/remoteproc/avm,wasp-rproc.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/remoteproc/avm,wasp-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/avm,wasp-rproc.yaml
> > new file mode 100644
> > index 000000000000..21f3bbcc4202
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/remoteproc/avm,wasp-rproc.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/remoteproc/avm,wasp-rproc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: AVM WASP processor controller bindings
> > +
> > +maintainers:
> > +  - Daniel Kestrel <kestrelseventyfour@...il.com>
> > +
> > +description: |
> > +  This document defines the bindings for the remoteproc component that loads and
> > +  boots firmwares on the AVM Wireless Assistent Support Processor (WASP) SoC
> > +  that is attached to some AVM Fritzbox devices (3390, 3490, 5490, 5491, 7490).
> > +
> > +properties:
> > +  compatible:
> > +    const: avm,wasp
> > +
> > +  ath9k-firmware:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    description: |
> > +      Should contain the name of the ath9k eeprom that is to be loaded from
> > +      the lantiq host flash. Wifi on the WASP SoC does not work without it.
> > +      The file should be located on the firmware search path.
>
> Are you sure this is a property of hardware? It looks like runtime
> configuration parameter.
>
> > +
> > +  ath10k-caldata:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    description: |
> > +      Should contain the name of the ath10k caldata that is to be loaded from
> > +      the lantiq host flash. Wifi on the WASP SoC does not work without it.
> > +      The file should be located on the firmware search path.
>
> Same.
>
> > +
> > +  wasp-netboot-firmware:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    description: |
> > +      Should contain the name of the netboot firmware that is to be loaded
> > +      and started on the WASP SoC using mdio in order to be able to load
> > +      the initramfs image as a second stage.
> > +      The file should be located on the firmware search path.
>
> Same.
>
> > +
> > +  wasp-netboot-mdio:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: Reference to the Lantiq GSWIP switch mdio.
>
> Vendor prefix.
>
> > +
> > +  wasp-initramfs-port:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: Reference to the network port, where the WASP SoC is connected to.
>
> Vendor prefix.
>
> > +
> > +  wasp-initramfs-image:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    description: |
> > +      Should contain the name of the initramfs linux image that is to be loaded
> > +      and started on the WASP SoC.
> > +      The file should be located on the firmware search path.
>
> initramfs path looks even less like a property of hardware... If you
> change initramfs from CPIO to initrd or GZ, hardware changes as well?
>
> > +  reset-gpio:
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    description: Reference and parameters for the reset gpio of the WASP SoC.
>
> Wrong suffix, unneeded type. Did you run dt_binding_check?

Hi Krzystof,

Sorry for missing the dt_binding_check.
I have switched to use devm_gpiod_get and it does not work if the
suffix is not -gpio
or -gpios (see of_find_gpio method).
Would avm,reset-gpio be ok to use here?

Thanks.
>
> "Reference and parameters" are obvious, so they should be skipped.
>
> > +
> > +  startup-gpio:
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    description: Reference and parameters for the power switch gpio of the WASP SoC.
>
> Same.
Is avm,startup-gpio ok, like above?
>
> > +
> > +required:
> > +  - compatible
> > +  - ath9k-firmware
> > +  - ath10k-caldata
> > +  - wasp-netboot-firmware
> > +  - wasp-netboot-mdio
> > +  - wasp-initramfs-port
> > +  - wasp-initramfs-image
> > +  - reset-gpio
> > +  - startup-gpio
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +
> > +    avm-wasp {
>
> Generic node name describing class of a device. AVM is company, WASP is
> product, so neither of them are generic.
>
>
> Best regards,
> Krzysztof