linux-kernel - Re: [PATCH 3/4] dt-bindings: spi: add binding doc for spi-mtk-snfi

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Message-ID: <06ef6b4b-c8e8-549b-54be-9eecf59a7757@linaro.org>
Date:   Sun, 3 Apr 2022 17:49:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Chuanhong Guo <gch981213@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     linux-spi@...ts.infradead.org, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Roger Quadros <rogerq@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Florian Fainelli <f.fainelli@...il.com>,
        Colin Ian King <colin.king@...el.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Pratyush Yadav <p.yadav@...com>, Yu Kuai <yukuai3@...wei.com>,
        "open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:NAND FLASH SUBSYSTEM" <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH 3/4] dt-bindings: spi: add binding doc for spi-mtk-snfi

On 03/04/2022 17:45, Chuanhong Guo wrote:
> Hi!
> 
> On Sun, Apr 3, 2022 at 11:37 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>> [...]
>>> +  compatible:
>>> +    enum:
>>> +      - mediatek,mt7622-snand
>>> +      - mediatek,mt7629-snand
>>
>> One blank line, please.
> 
> I'll fix this in the next version.
> 
>>
>>> +  reg:
>>> +    items:
>>> +      - description: core registers
>>> +
>>> +  interrupts:
>>> +    items:
>>> +      - description: NFI interrupt
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: clock used for the controller
>>> +      - description: clock used for the SPI bus
>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: nfi_clk
>>> +      - const: pad_clk
>>> +
>>> +  ecc-engine:
>>
>> The nand-chip.yaml defines a nand-ecc-engine, so how about using that
>> one? I know mtk-nand.txt uses ecc-engine, but for new schema better to
>> use properties from existing YAML.
> 
> The ecc-engine code is shared between mtk_nand.c and this driver, and
> the property name is defined in the shared part. I left it as-is so that
> existing dt for mtk_nand doesn't break.

This can be easily fixed with:
	np = of_parse_phandle(of_node, "nand-ecc-engine", 0);
	if (!np) {
		/* Backwards compatible */
		np = of_parse_phandle(of_node, "ecc-engine", 0);
	}

I would like to avoid having one property in generic NAND schema and
keep adding something slightly different everywhere else.

Best regards,
Krzysztof