Re: [RFC PATCH 6/7] ARM: dts: stm32: add ETZPC as a system bus for STM32MP15x boards

From: Krzysztof Kozlowski <krzk@kernel.org>
To: Gatien Chevallier <gatien.chevallier@foss.st.com>,
	alexandre.torgue@foss.st.com, robh+dt@kernel.org,
	Oleksii_Moisieiev@epam.com, linus.walleij@linaro.org,
	gregkh@linuxfoundation.org
Cc: linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, loic.pallardy@st.com,
	devicetree@vger.kernel.org, mark.rutland@arm.com, arnd@arndb.de
Subject: Re: [RFC PATCH 6/7] ARM: dts: stm32: add ETZPC as a system bus for STM32MP15x boards
Date: Thu, 22 Dec 2022 11:30:17 +0100	[thread overview]
Message-ID: <2e7c901c-e322-ded6-b170-6d2436d74c0f@kernel.org> (raw)
In-Reply-To: <20221221173055.11719-7-gatien.chevallier@foss.st.com>

On 21/12/2022 18:30, Gatien Chevallier wrote:
> The STM32 System Bus is an internal bus on which devices are connected.
> ETZPC is a peripheral overseeing the firewall bus that configures
> and control access to the peripherals connected on it.
> 
> For more information on which peripheral is securable, please read
> the STM32MP15 reference manual.
> 
> Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
> ---
>  arch/arm/boot/dts/stm32mp151.dtsi | 2737 +++++++++++++++--------------
>  1 file changed, 1406 insertions(+), 1331 deletions(-)
>  
> -		lptimer1: timer@40009000 {
> +		etzpc: etzpc@5c007000 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +			compatible = "st,stm32mp15-sys-bus";
> +			reg = <0x5c007000 0x400>;
>  			#address-cells = <1>;
> -			#size-cells = <0>;
> -			compatible = "st,stm32-lptimer";
> -			reg = <0x40009000 0x400>;
> -			interrupts-extended = <&exti 47 IRQ_TYPE_LEVEL_HIGH>;
> -			clocks = <&rcc LPTIM1_K>;
> -			clock-names = "mux";
> -			wakeup-source;
> -			status = "disabled";

Why entire bus is disabled? What resources do you miss?

> +			#size-cells = <1>;
> +			feature-domain-controller;
> +			#feature-domain-cells = <2>;
> +			ranges;
>  
Best regards,
Krzysztof

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