linux-kernel - RE: [PATCH v2 5/6] arm64: dts: imx8ulp: update gpio node

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Message-ID: <DU0PR04MB94170DBAD83CC752BA3B2B9188F4A@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Sun, 17 Sep 2023 12:51:15 +0000
From:   Peng Fan <peng.fan@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>
CC:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v2 5/6] arm64: dts: imx8ulp: update gpio node

> Subject: Re: [PATCH v2 5/6] arm64: dts: imx8ulp: update gpio node
> 
> On 16/09/2023 04:04, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > The i.MX8ULP GPIO supports two interrupts and one register base, and
> > not compatible with i.MX7ULP. Update the node following dt-binding doc.
> >
> I think last email thread concluded they are compatible. Otherwise, how did it
> work so far? You break users, which might be ok, but commit does no say
> that anything was broken here.
Per,
https://lore.kernel.org/all/02e25e44-1146-bb59-58de-800b11d30e7b@linaro.org/
I thought we agree they are not HW compatible, it is SW trick to make
Linux driver could work with both with i.MX7ULP compatible.

I will add more information in commit to describe breaking users.
BTW: in linux driver in this patchset, I have added code to support
legacy bindings.

Thanks,
Peng.

> 
> Best regards,
> Krzysztof