linux-kernel - Re: [PATCH] p54spi: convert to devicetree

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Date:   Fri, 17 Mar 2023 16:16:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Christian Lamparter <chunkeey@...glemail.com>,
        Kalle Valo <kvalo@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-gpio@...r.kernel.org, linux-omap@...r.kernel.org,
        Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Felipe Balbi <balbi@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] p54spi: convert to devicetree

On Tue, Mar 14, 2023 at 05:30:56PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The Prism54 SPI driver hardcodes GPIO numbers and expects users to
> pass them as module parameters, apparently a relic from its life as a
> staging driver. This works because there is only one user, the Nokia
> N8x0 tablet.
> 
> Convert this to the gpio descriptor interface and move the gpio
> line information into devicetree to improve this and simplify the
> code at the same time.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> As I don't have an N8x0, this is completely untested.
> 
> I listed the driver authors (Johannes and Christian) as the maintainers
> of the binding document, but I don't know if they actually have this
> hardware. It might be better to list someone who is actually using it.
> 
> Among the various chip identifications, I wasn't sure which one to
> use for the compatible string and the name of the binding document.
> I picked st,stlc4560 as that was cited as the version in the N800
> on multiple websites.
> ---
>  .../bindings/net/wireless/st,stlc45xx.yaml    | 64 +++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  arch/arm/boot/dts/omap2.dtsi                  |  4 ++
>  arch/arm/boot/dts/omap2420-n8x0-common.dtsi   | 12 ++++
>  arch/arm/mach-omap2/board-n8x0.c              | 18 -----
>  drivers/net/wireless/intersil/p54/p54spi.c    | 69 +++++++------------
>  drivers/net/wireless/intersil/p54/p54spi.h    |  3 +
>  7 files changed, 109 insertions(+), 62 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/wireless/st,stlc45xx.yaml

Binding looks fine, but I assume you'll split this into at least 3 
patches?

Rob