linux-kernel - Re: [PATCH v4 2/2] arm64: dts: imx93-var-som: Add Variscite VAR-SOM-MX93

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Date: Fri, 29 Dec 2023 18:17:57 +0100
From: Stefan Wahren <wahrenst@....net>
To: Mathieu Othacehe <othacehe@....org>
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>,
 Li Yang <leoyang.li@....com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v4 2/2] arm64: dts: imx93-var-som: Add Variscite
 VAR-SOM-MX93

Hi,

Am 29.12.23 um 17:48 schrieb Mathieu Othacehe:
> Hey,
>
>> I also saw in the other Symphony DTS a LED for heartbeat. Is it usable, too?
> Yes, I will add it to in v5.
>
>> According to the datasheet the SOM expose 7 UARTs, but only the debug
>> UART is enable. What is the reason for this?
> So those 7 UARTs are:
>
> UART1: console
> UART2: used by the microphone
> UART3: used by the resistive touch
> UART4: used by the ethernet/resistive touch
> UART5: on J18.4,6,8,10 (used by BT)
> UART6: on J18.7 and J18.9 (available)
> UART7: on J18.3 and J18.5 (used by the M33 firmware)
>
> I will enable UART6, and add a mention about UART7, something like:
>
> /* J18.7, J18.9 */
> &lpuart6 {
> 	pinctrl-names = "default";
> 	pinctrl-0 = <&pinctrl_uart6>;
> 	status = "okay";
> };
>
> /* J18.3, J18.5 - used by M33 firmware */
> &lpuart7 {
> 	pinctrl-names = "default";
> 	pinctrl-0 = <&pinctrl_uart7>;
> 	status = "disabled";
> };
in case this is used by the M33 firmware, this applies to all i.MX93 so
we don't need this. Just enable UART6 and keep UART7.
>> Btw the commit log mentions a Wifi (via SDIO?) and audio interface. This
>> is currently not supported by Linux?
> I am not sure about that, and I would prefer to study that a bit later
> on if that's OK :) I can remove it from the commit log as this is
> misleading as not already supported / tested.
This sounds good. No need to have it all at first.
>
> Thanks,
>
> Mathieu
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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