linux-kernel - Re: [PATCH v9 1/6] misc: Add support for LAN966x PCI device

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Message-ID: <dywwnh7ns47ffndsttstpcsw44avxjvzcddmceha7xavqjdi77@cqdgmpdtywol>
Date: Thu, 28 Nov 2024 20:42:53 +0100
From: Michal Kubecek <mkubecek@...e.cz>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>, 
	Andy Shevchenko <andy.shevchenko@...il.com>, Simon Horman <horms@...nel.org>, Lee Jones <lee@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Derek Kiernan <derek.kiernan@....com>, 
	Dragan Cvetic <dragan.cvetic@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Lars Povlsen <lars.povlsen@...rochip.com>, Steen Hegelund <Steen.Hegelund@...rochip.com>, 
	Daniel Machon <daniel.machon@...rochip.com>, UNGLinuxDriver@...rochip.com, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Saravana Kannan <saravanak@...gle.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Horatiu Vultur <horatiu.vultur@...rochip.com>, 
	Andrew Lunn <andrew@...n.ch>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	Allan Nielsen <allan.nielsen@...rochip.com>, Luca Ceresoli <luca.ceresoli@...tlin.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v9 1/6] misc: Add support for LAN966x PCI device

On Thu, Oct 10, 2024 at 08:36:01AM +0200, Herve Codina wrote:
> Add a PCI driver that handles the LAN966x PCI device using a device-tree
> overlay. This overlay is applied to the PCI device DT node and allows to
> describe components that are present in the device.
> 
> The memory from the device-tree is remapped to the BAR memory thanks to
> "ranges" properties computed at runtime by the PCI core during the PCI
> enumeration.
> 
> The PCI device itself acts as an interrupt controller and is used as the
> parent of the internal LAN966x interrupt controller to route the
> interrupts to the assigned PCI INTx interrupt.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>	# quirks.c
> ---
>  drivers/misc/Kconfig          |  24 ++++
>  drivers/misc/Makefile         |   3 +
>  drivers/misc/lan966x_pci.c    | 215 ++++++++++++++++++++++++++++++++++
>  drivers/misc/lan966x_pci.dtso | 167 ++++++++++++++++++++++++++
>  drivers/pci/quirks.c          |   1 +
>  5 files changed, 410 insertions(+)
>  create mode 100644 drivers/misc/lan966x_pci.c
>  create mode 100644 drivers/misc/lan966x_pci.dtso
> 
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 3fe7e2a9bd29..8e5b06ac9b6f 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -610,6 +610,30 @@ config MARVELL_CN10K_DPI
>  	  To compile this driver as a module, choose M here: the module
>  	  will be called mrvl_cn10k_dpi.
>  
> +config MCHP_LAN966X_PCI
> +	tristate "Microchip LAN966x PCIe Support"
> +	depends on PCI
> +	select OF
> +	select OF_OVERLAY

Are these "select" statements what we want? When configuring current
mainline snapshot, I accidentally enabled this driver and ended up
flooded with an enormous amount of new config options, most of which
didn't make much sense on x86_64. It took quite long to investigate why.

Couldn't we rather use

	depends on PCI && OF && OF_OVERLAY

like other drivers?

Michal

> +	select IRQ_DOMAIN
> +	help
> +	  This enables the support for the LAN966x PCIe device.
> +	  This is used to drive the LAN966x PCIe device from the host system
> +	  to which it is connected.
> +
> +	  This driver uses an overlay to load other drivers to support for
> +	  LAN966x internal components.
> +	  Even if this driver does not depend on these other drivers, in order
> +	  to have a fully functional board, the following drivers are needed:
> +	    - fixed-clock (COMMON_CLK)
> +	    - lan966x-oic (LAN966X_OIC)
> +	    - lan966x-cpu-syscon (MFD_SYSCON)
> +	    - lan966x-switch-reset (RESET_MCHP_SPARX5)
> +	    - lan966x-pinctrl (PINCTRL_OCELOT)
> +	    - lan966x-serdes (PHY_LAN966X_SERDES)
> +	    - lan966x-miim (MDIO_MSCC_MIIM)
> +	    - lan966x-switch (LAN966X_SWITCH)
> +
>  source "drivers/misc/c2port/Kconfig"
>  source "drivers/misc/eeprom/Kconfig"
>  source "drivers/misc/cb710/Kconfig"
[...]

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