netdev - Re: [RFC 01/13] dt-bindings: remoteproc: Add PRU consumer bindings

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Date:   Tue, 12 Apr 2022 12:11:02 +0530
From:   Puranjay Mohan <p-mohan@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <bjorn.andersson@...aro.org>,
        <mathieu.poirier@...aro.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <nm@...com>, <ssantosh@...nel.org>, <s-anna@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <davem@...emloft.net>,
        <kuba@...nel.org>, <netdev@...r.kernel.org>, <vigneshr@...com>,
        <kishon@...com>
Subject: Re: [RFC 01/13] dt-bindings: remoteproc: Add PRU consumer bindings

Hi Rob,

On 07/04/22 20:39, Rob Herring wrote:
> On Wed, Apr 06, 2022 at 03:13:46PM +0530, Puranjay Mohan wrote:
>> From: Suman Anna <s-anna@...com>
>>
>> Add a YAML binding document for PRU consumers. The binding includes
>> all the common properties that can be used by different PRU consumer
>> or application nodes and supported by the PRU remoteproc driver.
>> These are used to configure the PRU hardware for specific user
>> applications.
>>
>> The application nodes themselves should define their own bindings.
>>
>> Co-developed-by: Tero Kristo <t-kristo@...com>
>> Signed-off-by: Tero Kristo <t-kristo@...com>
>> Signed-off-by: Suman Anna <s-anna@...com>
>> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
>> Signed-off-by: Puranjay Mohan <p-mohan@...com>
>> ---
>>  .../bindings/remoteproc/ti,pru-consumer.yaml  | 66 +++++++++++++++++++
>>  1 file changed, 66 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml b/Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
>> new file mode 100644
>> index 000000000000..c245fe1de656
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
>> @@ -0,0 +1,66 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/remoteproc/ti,pru-consumer.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Common TI PRU Consumer Binding
>> +
>> +maintainers:
>> +  - Suman Anna <s-anna@...com>
>> +
>> +description: |
>> +  A PRU application/consumer/user node typically uses one or more PRU device
>> +  nodes to implement a PRU application/functionality. Each application/client
>> +  node would need a reference to at least a PRU node, and optionally define
>> +  some properties needed for hardware/firmware configuration. The below
>> +  properties are a list of common properties supported by the PRU remoteproc
>> +  infrastructure.
>> +
>> +  The application nodes shall define their own bindings like regular platform
>> +  devices, so below are in addition to each node's bindings.
>> +
>> +properties:
>> +  ti,prus:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> 
> Needs contraints. A phandle-array is really a matrix of phandles and 
> args. If no args, something like this:
> 
> minItems: ??
> maxItems: ??
> items:
>   maxItems: 1

So, I can add:
minItems: 1
as max items can't be constrained.
Also, there are no args.

> 
>> +    description: phandles to the PRU, RTU or Tx_PRU nodes used
>> +
>> +  firmware-name:
>> +    $ref: /schemas/types.yaml#/definitions/string-array
>> +    description: |
>> +      firmwares for the PRU cores, the default firmware for the core from
>> +      the PRU node will be used if not provided. The firmware names should
>> +      correspond to the PRU cores listed in the 'ti,prus' property
>> +
>> +  ti,pruss-gp-mux-sel:
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    maxItems: 6
>> +    items:
>> +        enum: [0, 1, 2, 3, 4]
>> +    description: |
>> +      array of values for the GP_MUX_SEL under PRUSS_GPCFG register for a PRU.
>> +      This selects the internal muxing scheme for the PRU instance. Values
>> +      should correspond to the PRU cores listed in the 'ti,prus' property. The
>> +      GP_MUX_SEL setting is a per-slice setting (one setting for PRU0, RTU0,
>> +      and Tx_PRU0 on K3 SoCs). Use the same value for all cores within the
>> +      same slice in the associative array. If the array size is smaller than
>> +      the size of 'ti,prus' property, the default out-of-reset value (0) for the
>> +      PRU core is used.
>> +
>> +required:
>> +  - ti,prus
>> +
>> +dependencies:
>> +  firmware-name: [ 'ti,prus' ]
>> +  ti,pruss-gp-mux-sel: [ 'ti,prus' ]
>> +
>> +additionalProperties: true
> 
> This must be false unless it is a common, shared schema.

This is a shared schema, so I made it true.

> 
>> +
>> +examples:
>> +  - |
>> +    /* PRU application node example */
>> +    pru-app {
>> +        ti,prus = <&pru0>, <&pru1>;
>> +        firmware-name = "pruss-app-fw0", "pruss-app-fw1";
>> +        ti,pruss-gp-mux-sel = <2>, <1>;
>> +    };
>> -- 
>> 2.17.1
>>
>>


Thanks,
Puranjay