linux-kernel - Re: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update dma-ranges for PCIe

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Message-ID: <20250708165540.GA2148533@bhelgaas>
Date: Tue, 8 Jul 2025 11:55:40 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kwilczynski@...nel.org,
	mani@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, geert+renesas@...der.be, magnus.damm@...il.com,
	catalin.marinas@....com, will@...nel.org, mturquette@...libre.com,
	sboyd@...nel.org, p.zabel@...gutronix.de, lizhi.hou@....com,
	linux-pci@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update
 dma-ranges for PCIe

On Fri, Jul 04, 2025 at 07:14:07PM +0300, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> The first 128MB of memory is reserved on this board for secure area.
> Update the PCIe dma-ranges property to reflect this.

Can we include a sentence or two about what the "secure area" means?
I don't know how to connect this with anything in the driver.

> Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
> 
> Changes in v3:
> - collected tags
> 
> Changes in v2:
> - none, this patch is new
> 
>  arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
> index 39845faec894..1b03820a6f02 100644
> --- a/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
> +++ b/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
> @@ -214,6 +214,11 @@ &sdhi2 {
>  };
>  #endif
>  
> +&pcie {
> +	/* First 128MB is reserved for secure area. */
> +	dma-ranges = <0x42000000 0 0x48000000 0 0x48000000 0x0 0x38000000>;
> +};
> +
>  &pinctrl {
>  #if SW_CONFIG3 == SW_ON
>  	eth0-phy-irq-hog {
> -- 
> 2.43.0
>