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Message-ID: <9088acd0-4650-4b10-88f9-6b6c0b1f9978@broadcom.com>
Date: Mon, 7 Apr 2025 13:57:42 -0700
From: Justin Chen <justin.chen@...adcom.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: florian.fainelli@...adcom.com, conor+dt@...nel.org, krzk+dt@...nel.org,
robh@...nel.org, jassisinghbrar@...il.com,
bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v3 1/2] dt-bindings: mailbox: Add support for bcm74110
On 4/6/25 5:27 AM, Krzysztof Kozlowski wrote:
> On 05/04/2025 00:20, justin.chen@...adcom.com wrote:
>> +
>> +maintainers:
>> + - Justin Chen <justin.chen@...adcom.com>
>> + - Florian Fainelli <florian.fainelli@...adcom.com>
>> +
>> +description: Broadcom mailbox hardware first introduced with 74110
>> +
>> +properties:
>> + compatible:
>> + enum:
>> + - brcm,bcm74110-mbox
>> +
>> + reg:
>> + maxItems: 1
>> +
>> + interrupts:
>> + minItems: 1
>
> Third version of patchset, third entirely different code.
>
> Decide finally what is the hardware and send binding matching it.
> Hardware did not change last one week three times.
>
> Drop minItems or explain why this is flexible on the same SoC or between
> boards using same SoC. You can always point me to upstream DTS, which
> would solve many questions.
>
We do not have an upstream DTS. We have a scripting engine that
generates a DTS and we distribute DTBs to our customers. The example
from v2 of my patch was copied from said generated DTS.
Apologies as I navigate through the different yaml keywords here. The HW
isn't changing, I am just struggling with representing the HW using the
different keywords. And the different implications of using said keywords.
Here is what I have for v4.
items:
- description: RX doorbell and watermark interrupts
- description: TX doorbell and watermark interrupts
+ description:
+ RX interrupts are required to notify the host of pending messages. TX
+ interrupts are optional. The TX doorbell interrupt is not used by the
+ host, but watermark interrupts may be used to notify a host
waiting on
+ a full out queue.
Thanks,
Justin
>> + items:
>> + - description: RX doorbell and watermark interrupts
>> + - description: TX doorbell and watermark interrupts
>> +
>
>
> Best regards,
> Krzysztof
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