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

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Message-ID: <7c8c7a25-c373-452a-9fe8-8b2d92ddd885@tuxon.dev>
Date: Tue, 8 Jul 2025 13:09:55 +0300
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>,
 "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
 "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
 "kwilczynski@...nel.org" <kwilczynski@...nel.org>,
 "mani@...nel.org" <mani@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
 "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "geert+renesas@...der.be" <geert+renesas@...der.be>,
 "magnus.damm@...il.com" <magnus.damm@...il.com>,
 "catalin.marinas@....com" <catalin.marinas@....com>,
 "will@...nel.org" <will@...nel.org>,
 "mturquette@...libre.com" <mturquette@...libre.com>,
 "sboyd@...nel.org" <sboyd@...nel.org>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "lizhi.hou@....com" <lizhi.hou@....com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
 "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...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>,
 "linux-clk@...r.kernel.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

Hi, Biju,

On 07.07.2025 11:18, Biju Das wrote:
> Hi Claudiu,
> 
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: 04 July 2025 17:14
>> Subject: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update dma-ranges for PCIe
>>
>> 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.
> 
> I see R-Car PCIe dma-ranges[1] and [2] maps all possible DDR area supported by the SoC?
> Do we need to make board specific as well there?

I'm not familiar with R-Car, but if there are ranges reserved for other
purposes, I think we should reflect it in board specific device trees.

But that would have to be address though a different series as it has
nothing to do with enabling the RZ/G3S PCIe support.

Thank you,
Claudiu

> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/r8a774e1.dtsi?h=next-20250704#n2487
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/salvator-common.dtsi?h=next-20250704
> 
> Cheers,
> Biju
> 
>>
>> 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
>>
>