linux-kernel - Re: [PATCH] PCI: keystone: Fix build error while only CONFIG_PCI

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Message-ID: <20190422132617.GL173520@google.com>
Date:   Mon, 22 Apr 2019 08:26:17 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     YueHaibing <yuehaibing@...wei.com>, lorenzo.pieralisi@....com,
        robh@...nel.org, l.stach@...gutronix.de, andrew.smirnov@...il.com,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: keystone: Fix build error while only
 CONFIG_PCI_KEYSTONE is set

On Mon, Apr 22, 2019 at 01:19:53PM +0530, Kishon Vijay Abraham I wrote:
> Hi Bjorn,
> ...

> Sometime back Niklas had fixed this for DRA7xx in
> 
> commit b052835c63857e13d9ada3ebc57a8f9e1d124f3a
> Author: Niklas Cassel <niklas.cassel@...s.com>
> Date:   Wed Dec 20 00:29:28 2017 +0100
> 
>     PCI: dwc: dra7xx: Refactor Kconfig and Makefile handling for host/ep mode
> 
>     Refactor the Kconfig and Makefile handling for host/ep mode, since
>     the previous handling was a bit unorthodox and would have been a bit
>     bloated once more DWC based controllers added support for ep mode.
> 
>     Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
>     Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>     Acked-by: Kishon Vijay Abraham I <kishon@...com>
> 
> Something similar is applicable for Keystone too as you mentioned without
> selecting PCI_KEYSTONE_HOST or PCI_KEYSTONE_EP, compiling pci-keystone.c
> doesn't make sense.
> 
> Please see if below looks okay to you. This can be merged with "PCI:
> keystone:Add support for PCIe EP in AM654x Platforms"). Let me know if I have
> to send it separately with Fixes tag.

Lorenzo merged that commit, so I assume he'll take care of this.

> 8<---------------------------------------------------------
> From 8fba36048112cf72c49996fc47fd808534bf9689 Mon Sep 17 00:00:00 2001
> From: Kishon Vijay Abraham I <kishon@...com>
> Date: Mon, 22 Apr 2019 11:42:32 +0530
> Subject: [PATCH] PCI: keystone: Refactor Kconfig for RC/EP mode
> 
> Do not allow PCI_KEYSTONE to be visible to user and let user visible
> CONFIG symbols PCI_KEYSTONE_HOST and PCI_KEYSTONE_EP select
> PCI_KEYSTONE. This will let pci-keystone.c to be compiled only when
> either PCI_KEYSTONE_HOST or PCI_KEYSTONE_EP is selected.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/controller/dwc/Kconfig | 24 +++++++++++-------------
>  1 file changed, 11 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/Kconfig
> b/drivers/pci/controller/dwc/Kconfig
> index b450ad2823a5..90618233d15b 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -103,34 +103,32 @@ config PCIE_SPEAR13XX
>  	  Say Y here if you want PCIe support on SPEAr13XX SoCs.
> 
>  config PCI_KEYSTONE
> -	bool "TI Keystone PCIe controller"
> -	depends on ARCH_KEYSTONE || ARCH_K3 || ((ARM || ARM64) && COMPILE_TEST)
> -	help
> -	  Say Y here if you want to enable PCI controller support on Keystone
> -	  SoCs. The PCI controller on Keystone is based on DesignWare hardware
> -	  and therefore the driver re-uses the DesignWare core functions to
> -	  implement the driver.
> -
> -if PCI_KEYSTONE
> +	bool
> 
>  config PCI_KEYSTONE_HOST
>  	bool "PCI Keystone Host Mode"
> +	depends on ARCH_KEYSTONE || ARCH_K3 || ((ARM || ARM64) && COMPILE_TEST)
>  	depends on PCI_MSI_IRQ_DOMAIN
>  	select PCIE_DW_HOST
> +	select PCI_KEYSTONE
>  	default y
>  	help
>  	 Enables support for the PCIe controller in the Keystone SoC to work in
> -	 host mode.
> +	 host mode. The PCI controller on Keystone is based on DesignWare hardware
> +	 and therefore the driver re-uses the DesignWare core functions to
> +	 implement the driver.
> 
>  config PCI_KEYSTONE_EP
>  	bool "PCI Keystone Endpoint Mode"
> +	depends on ARCH_KEYSTONE || ARCH_K3 || ((ARM || ARM64) && COMPILE_TEST)
>  	depends on PCI_ENDPOINT
>  	select PCIE_DW_EP
> +	select PCI_KEYSTONE
>  	help
>  	 Enables support for the PCIe controller in the Keystone SoC to work in
> -	 endpoint mode.
> -
> -endif
> +	 endpoint mode. The PCI controller on Keystone is based on DesignWare hardware
> +	 and therefore the driver re-uses the DesignWare core functions to
> +	 implement the driver.
> 
>  config PCI_LAYERSCAPE
>  	bool "Freescale Layerscape PCIe controller"
> -- 
> 2.17.1