linux-kernel - Re: [PATCH AUTOSEL 6.6 34/40] arm64: dts: renesas: r8a779f0: spider: Enable PCIe Host ch0

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Date:   Thu, 16 Nov 2023 12:58:44 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        magnus.damm@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.6 34/40] arm64: dts: renesas: r8a779f0: spider:
 Enable PCIe Host ch0

On Tue, Nov 07, 2023 at 07:50:52PM +0100, Geert Uytterhoeven wrote:
>Hi Sasha,
>
>On Tue, Nov 7, 2023 at 1:21 PM Sasha Levin <sashal@...nel.org> wrote:
>> From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>>
>> [ Upstream commit c588e1c9846b32182fd5a0ceb637b983810e7100 ]
>>
>> Enable PCIe Host controller channel 0 on R-Car S4-8 Spider board.
>>
>> Since this board has an Oculink connector, CLKREQ# pin of PFC for PCIe
>> should not be used. So, using a GPIO is used to output the clock instead.
>> Otherwise the controller cannot detect a PCIe device.
>>
>> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> Link: https://lore.kernel.org/r/20230905012404.2915246-3-yoshihiro.shimoda.uh@renesas.com
>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>Thanks for your patch!
>
>> --- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
>> +++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
>
>> @@ -145,6 +157,18 @@ &mmc0 {
>>         status = "okay";
>>  };
>>
>> +&pcie0_clkref {
>> +       compatible = "gpio-gate-clock";
>> +       clocks = <&rc21012_pci>;
>> +       enable-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
>> +       /delete-property/ clock-frequency;
>> +};
>> +
>> +&pciec0 {
>> +       reset-gpio = <&gpio_exp_20 0 GPIO_ACTIVE_LOW>;
>> +       status = "okay";
>> +};
>> +
>>  &pfc {
>>         pinctrl-0 = <&scif_clk_pins>;
>>         pinctrl-names = "default";
>
>These references have a hard dependency on commit 183a709d3719e5c9
>("arm64: dts: renesas: r8a779f0: Add PCIe Host and Endpoint nodes")
>in v6.6+ (i.e. v6.7-rc1 soon).
>
>To actually work, this has a soft (runtime) dependency on commit
>0d0c551011df4519 ("PCI: rcar-gen4: Add R-Car Gen4 PCIe controller
>support for host mode") in v6.6+.

Sounds like I should just drop this patch :)

-- 
Thanks,
Sasha