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

From: Puranjay Mohan
Date: Tue Apr 12 2022 - 03:15:48 EST


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@xxxxxx>
>>
>> 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@xxxxxx>
>> Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
>> Signed-off-by: Suman Anna <s-anna@xxxxxx>
>> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
>> Signed-off-by: Puranjay Mohan <p-mohan@xxxxxx>
>> ---
>> .../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@xxxxxx>
>> +
>> +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