linux-kernel - Re: [PATCH v3 1/5] dt-bindings: remoteproc: Add PRU consumer bindings

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Message-ID: <6c054a1b-2842-a6f0-733a-92cfda76f828@ti.com>
Date:   Thu, 2 Jun 2022 10:58:24 +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>, <rogerq@...nel.org>,
        <grygorii.strashko@...com>, <vigneshr@...com>, <kishon@...com>
Subject: Re: [PATCH v3 1/5] dt-bindings: remoteproc: Add PRU consumer bindings

Hi Rob,

On 03/05/22 01:26, Rob Herring wrote:
> On Mon, Apr 18, 2022 at 04:11:14PM +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  | 70 +++++++++++++++++++
>>  1 file changed, 70 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..5b1f1cb2f098
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
>> @@ -0,0 +1,70 @@
>> +# 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
>> +    description: phandles to the PRU, RTU or Tx_PRU nodes used
>> +    minItems: 1
>> +    maxItems: 6
>> +    items:
>> +      maxItems: 1
>> +
>> +  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
> 
> So should be the name number of entries?:
> 
> minItems: 1
> maxItems: 6

will add in v4

> 
>> +
>> +  ti,pruss-gp-mux-sel:
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> 
> minItems: 1

will add in v4

> 
>> +    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' ]
> 
> This doesn't make sense because 'ti,prus' is already required. Should 
> all 3 properties always be required?

All three of these are always required, so, I will remove the
"dependencies:" tag and add all three of them to "required:" in v4
Will it be the correct way to do it?

> 
>> +
>> +additionalProperties: 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>;
> 
> This example never validates, but okay I guess.
> 
>> +    };
>> -- 
>> 2.17.1
>>
>>

Thanks,
Puranjay Mohan