linux-kernel - Re: [PATCH 5/5] arm64: dts: imx93: update gpio node

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Message-ID: <cc25b9ba-08e6-24e1-8e21-f3e43bb73311@linaro.org>
Date:   Thu, 14 Sep 2023 09:11:16 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peng Fan <peng.fan@....com>,
        "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 5/5] arm64: dts: imx93: update gpio node

On 14/09/2023 08:53, Peng Fan wrote:
>> Subject: Re: [PATCH 5/5] arm64: dts: imx93: update gpio node
>>
>> On 14/09/2023 08:04, Peng Fan wrote:
>>>> Subject: Re: [PATCH 5/5] arm64: dts: imx93: update gpio node
>>>>
>>>> On 14/09/2023 04:21, Peng Fan (OSS) wrote:
>>>>> From: Peng Fan <peng.fan@....com>
>>>>>
>>>>> Per binding doc, i.MX93 GPIO supports two interrupts, and not
>>>>> compatible with i.MX7ULP. So update the node
>>>>>
>>>>> Signed-off-by: Peng Fan <peng.fan@....com>
>>>>> ---
>>>>>  arch/arm64/boot/dts/freescale/imx93.dtsi | 20 ++++++++++++--------
>>>>>  1 file changed, 12 insertions(+), 8 deletions(-)
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/freescale/imx93.dtsi
>>>>> b/arch/arm64/boot/dts/freescale/imx93.dtsi
>>>>> index 6f85a05ee7e1..011c34a57c53 100644
>>>>> --- a/arch/arm64/boot/dts/freescale/imx93.dtsi
>>>>> +++ b/arch/arm64/boot/dts/freescale/imx93.dtsi
>>>>> @@ -825,11 +825,12 @@ usdhc3: mmc@...b0000 {
>>>>>  		};
>>>>>
>>>>>  		gpio2: gpio@...10080 {
>>>>> -			compatible = "fsl,imx93-gpio", "fsl,imx7ulp-gpio";
>>>>> +			compatible = "fsl,imx93-gpio", "fsl,imx8ulp-gpio";
>>>>
>>>> As your driver change points, it is breaking users, so no :(
>>>
>>> ok. Although i.MX93 GPIO is not compatible with i.MX7ULP from HW
>>> perspective, the compatible string should keep as it is now and
>>> binding
>>
>> If it is not compatible, then how could it work before?
> 
> i.MX7ULP reg:
> 0h Port Data Output Register (PDOR) 
> 4h Port Set Output Register (PSOR) 
> 8h Port Clear Output Register (PCOR) 
> Ch Port Toggle Output Register (PTOR) 
> 10h Port Data Input Register (PDIR) 
> 14h Port Data Direction Register (PDDR)
> 
> i.MX8ULP/93 has different registers address, but 
> i.MX93 registers has 0x40 off as below:
> 40h Port Data Output (PDOR)
> 
> Even linux i.MX7ULP gpio driver could work with i.MX8ULP/93
> GPIO HW with dts node using an 0x40 offset + base addr
> for i.MX93 gpio. I think from hw design, they are
> not compatible. Besides the upper differences,
> there are other differences.

Sorry, I don't understand it. I asked how could they work before in
Linux, if they are not compatible, and you pasted regs.

So again - if they are not compatible, how could it work? Or maybe it
never worked? But then commit msg would say it.

Best regards,
Krzysztof