linux-kernel - Re: [PATCH v4 1/5] arm64: Kconfig: enable PCI Power Control Slot driver for QCOM

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Message-ID: <46r6cdcugwvyuvkjqbi3tq4f7ddkrgy4jut5fwqjsfwbsfoke4@upmtzhcmc7ni>
Date: Wed, 4 Jun 2025 15:30:22 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Wenbin Yao <quic_wenbyao@...cinc.com>
Cc: catalin.marinas@....com, will@...nel.org, 
	linux-arm-kernel@...ts.infradead.org, konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, vkoul@...nel.org, kishon@...nel.org, sfr@...b.auug.org.au, 
	linux-phy@...ts.infradead.org, krishna.chundru@....qualcomm.com, quic_vbadigan@...cinc.com, 
	quic_mrana@...cinc.com, quic_cang@...cinc.com, qiang.yu@....qualcomm.com
Subject: Re: [PATCH v4 1/5] arm64: Kconfig: enable PCI Power Control Slot
 driver for QCOM

On Wed, Jun 04, 2025 at 04:02:33PM +0800, Wenbin Yao wrote:
> From: Qiang Yu <qiang.yu@....qualcomm.com>
> 
> Enable the pwrctrl driver, which is utilized to manage the power supplies
> of the devices connected to the PCI slots. This ensures that the voltage
> rails of the standard PCI slots on some platforms eg. X1E80100-QCP can be
> correctly turned on/off if they are described under PCIe port device tree
> node.
> 
> Signed-off-by: Qiang Yu <qiang.yu@....qualcomm.com>
> Signed-off-by: Wenbin Yao <quic_wenbyao@...cinc.com>
> ---
>  arch/arm64/Kconfig.platforms | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> index a541bb029..0ffd65e36 100644
> --- a/arch/arm64/Kconfig.platforms
> +++ b/arch/arm64/Kconfig.platforms
> @@ -270,6 +270,7 @@ config ARCH_QCOM
>  	select GPIOLIB
>  	select PINCTRL
>  	select HAVE_PWRCTRL if PCI
> +	select PCI_PWRCTRL_SLOT if PCI

PWRCTL isn't a fundamental feature of ARCH_QCOM, so why do we select it
here?

Regards,
Bjorn

>  	help
>  	  This enables support for the ARMv8 based Qualcomm chipsets.
>  
> -- 
> 2.34.1
>