linux-kernel - Re: [PATCH v4 3/3] arm64: dts: ti: k3-am69-sk: Add phase tags marking

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Date:   Fri, 11 Aug 2023 23:05:24 +0530
From:   "Kumar, Udit" <u-kumar1@...com>
To:     Apurva Nandan <a-nandan@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Hari Nagalla <hnagalla@...com>,
        Dasnavis Sabiya <sabiya.d@...tralsolutions.com>
Subject: Re: [PATCH v4 3/3] arm64: dts: ti: k3-am69-sk: Add phase tags marking

Hi Apurva

On 8/11/2023 8:46 PM, Apurva Nandan wrote:
> bootph-all as phase tag was added to dt-schema
> (dtschema/schemas/bootph.yaml) to cover U-Boot challenges with DT.
> That's why add it also to Linux to be aligned with bootloader requirement.
>
> wkup_uart0, wkup_i2c0, mcu_uart0, main_uart8, main_sdhci0 and main_sdhci1
> are required for bootloader operation on TI K3 AM69-SK EVM. These IPs
> along with pinmuxes need to be marked for all bootloader phases, hence add
> bootph-all to these nodes in kernel dts.
>
> Signed-off-by: Apurva Nandan <a-nandan@...com>
> ---
> [...]
>   &wkup_uart0 {
> +	bootph-all;
>   	/* Firmware usage */
>   	status = "reserved";
>   	pinctrl-names = "default";

I am not sure, if you want to treat wkup_uart in same way as you are 
treating secure_proxy_mcu in patch 1 of this series.

IMO, where we are making this node status is okay, mark booth-all at 
that place only.

Otherwise for rest of series

LGTM


> @@ -249,6 +257,7 @@ &wkup_uart0 {
>   };
>   
>   &wkup_i2c0 {
> +	bootph-all;
>   	status = "okay";
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&wkup_i2c0_pins_default>;
> @@ -268,6 +277,7 @@ &wkup_gpio0 {
>   };
>   
>   &mcu_uart0 {
> +	bootph-all;
>   	status = "okay";
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&mcu_uart0_pins_default>;
> @@ -281,6 +291,7 @@ &mcu_i2c0 {
>   };
>   
>   &main_uart8 {
> +	bootph-all;
>   	status = "okay";
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&main_uart8_pins_default>;
> @@ -307,6 +318,7 @@ exp1: gpio@21 {
>   };
>   
>   &main_sdhci0 {
> +	bootph-all;
>   	/* eMMC */
>   	status = "okay";
>   	non-removable;
> @@ -315,6 +327,7 @@ &main_sdhci0 {
>   };
>   
>   &main_sdhci1 {
> +	bootph-all;
>   	/* SD card */
>   	status = "okay";
>   	pinctrl-0 = <&main_mmc1_pins_default>;