linux-kernel - Re: [PATCH v2 01/10] dt-bindings: mtd: brcmnand: Updates for bcmbca SoCs

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Date: Mon, 22 Jan 2024 15:47:42 -0800
From: William Zhang <william.zhang@...adcom.com>
To: Rafał Miłecki <rafal@...ecki.pl>, dregan@...adcom.com,
 miquel.raynal@...tlin.com
Cc: dregan@...l.com, richard@....at, vigneshr@...com, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 computersforpeace@...il.com, kdasu.kdev@...il.com,
 linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, joel.peshkin@...adcom.com,
 tomer.yacoby@...adcom.com, dan.beygelman@...adcom.com,
 anand.gore@...adcom.com, kursad.oney@...adcom.com,
 florian.fainelli@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
 andre.przywara@....com, baruch@...s.co.il,
 linux-arm-kernel@...ts.infradead.org, dan.carpenter@...aro.org
Subject: Re: [PATCH v2 01/10] dt-bindings: mtd: brcmnand: Updates for bcmbca
 SoCs

Hi

On 1/22/24 10:57, Rafał Miłecki wrote:
> On 2024-01-18 20:53, dregan@...adcom.com wrote:
>> @@ -111,6 +113,17 @@ properties:
>>        earlier versions of this core that include WP
>>      type: boolean
>>
>> +  brcm,nand-use-wp:
>> +    description:
>> +      Use this property to indicate if board design uses
>> +      controller's write protection feature and connects its
>> +      NAND_WPb pin to nand chip's WP_L pin. Driver defaults to
>> +      use this feature when this property does not exist.
>> +      Set to 0 if WP pins are not connected and feature is not
>> +      used. Set to 1 if WP pins are connected and feature is used.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [0, 1]
>> +
>>  patternProperties:
>>    "^nand@[a-f0-9]$":
>>      type: object
> 
> Please take a look at:
> [PATCH 1/2] dt-bindings: mtd: brcmnand: add "no-wp" property
> https://lore.kernel.org/linux-mtd/20211109115215.5bcef0db@xps13/T/
> 
> Miquel suggested a generic property applicable to all raw NANDs for
> such purpose. Unfortunately I dropped the ball on that.
> 
This is already added in this commit 
https://github.com/torvalds/linux/commit/cb57fae479be41d1233f5a49d4760de9a5692b6e. 
But brcmnand nand controller has dedicated pin for WP and don't use 
GPIO.  So it does not apply to here.  Basically brcmnand controller 
handle the WP inside the controller and its driver.

brcm,nand-has-wp is SoC level flag and it actually is only needed for 
some rare earlier versions of the controller.  I don't want to break 
that so I added this board level flag brcm,nand-use-wp for per board 
control of the WP pin usage.  As you know many BCMBCA reference boards 
(like the 4908 based) do not connect WP pin so customer follow the same. 
You can use this flag in the Asus GT-AC5300 board dts as you intended to 
address in your patch.


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