linux-kernel - Re: [PATCH 06/13] dt-bindings: rng: add bindings for microchip mpfs rng

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Date:   Tue, 9 Nov 2021 13:56:51 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Conor.Dooley@...rochip.com
Cc:     broonie@...nel.org, aou@...s.berkeley.edu, robh+dt@...nel.org,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        palmer@...belt.com, paul.walmsley@...ive.com,
        jassisinghbrar@...il.com, atish.patra@....com,
        Daire.McNamara@...rochip.com, Lewis.Hanly@...rochip.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        geert@...ux-m68k.org, linux-gpio@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-usb@...r.kernel.org, bin.meng@...driver.com,
        linux-i2c@...r.kernel.org, alexandre.belloni@...tlin.com,
        Ivan.Griffin@...rochip.com, linux-rtc@...r.kernel.org,
        linux-spi@...r.kernel.org, a.zummo@...ertech.it,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH 06/13] dt-bindings: rng: add bindings for microchip mpfs
 rng

On 09/11/2021 13:54, Conor.Dooley@...rochip.com wrote:
> On 08/11/2021 21:16, Krzysztof Kozlowski wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 08/11/2021 16:05, conor.dooley@...rochip.com wrote:
>>> From: Conor Dooley <conor.dooley@...rochip.com>
>>>
>>> Add device tree bindings for the hardware rng device accessed via
>>> the system services on the Microchip PolarFire SoC.
>>>
>>> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
>>> ---
>>>   .../bindings/rng/microchip,mpfs-rng.yaml      | 31 +++++++++++++++++++
>>>   1 file changed, 31 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/rng/microchip,mpfs-rng.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/rng/microchip,mpfs-rng.yaml b/Documentation/devicetree/bindings/rng/microchip,mpfs-rng.yaml
>>> new file mode 100644
>>> index 000000000000..e8ecb3538a86
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/rng/microchip,mpfs-rng.yaml
>>> @@ -0,0 +1,31 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: "http://devicetree.org/schemas/rng/microchip,mpfs-rng.yaml#"
>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>>> +
>>> +title: Microchip MPFS random number generator
>>> +
>>> +maintainers:
>>> +  - Conor Dooley <conor.dooley@...rochip.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: microchip,polarfire-soc-rng
>>> +
>>> +  syscontroller:
>>> +    maxItems: 1
>>> +    description: name of the system controller device node
>>
>> There are several issues with this:
>> 1. You need to describe the type.
>> 2. Description is not helpful (just copying the name of property) and
>> actually misleading because you do not put there the name of device node.
>> 3. What is it? Looks like syscon (or sometimes called sysreg). If yes,
>> please use existing syscon bindings.
> 1 & 2 - Correct, it is bad & I'll write a better description for it.
> 3 - Its a system controller implemented as a mailbox. The syscontroller 
> is the mailbox client, which the rng and generic drivers both use.

I understood that pointed device node is a mailbox, not this node. But
here, what is it here? How do you use it here?

Best regards,
Krzysztof