netdev - Re: [PATCH] [v3] wiznet: convert to GPIO descriptors

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Message-ID: <20230130191354.GA3192963-robh@kernel.org>
Date:   Mon, 30 Jan 2023 13:13:54 -0600
From:   Rob Herring <robh@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Jakub Kicinski <kuba@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v3] wiznet: convert to GPIO descriptors

On Fri, Jan 27, 2023 at 10:57:08AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The w5100/w5300 drivers only support probing with old platform data in
> MMIO mode, or probing with DT in SPI mode. There are no users of this
> platform data in tree, and from the git history it appears that the only
> users of MMIO mode were on the (since removed) blackfin architecture.
> 
> Remove the platform data option, as it's unlikely to still be needed, and
> change the internal operation to GPIO descriptors, making the behavior
> the same for SPI and MMIO mode. The other data in the platform_data
> structure is the MAC address, so make that also handled the same for both.
> 
> It would probably be possible to just remove the MMIO mode driver
> completely, but it seems fine otherwise, and fixing it to use the modern
> interface seems easy enough.
> 
> The CONFIG_WIZNET_BUS_SHIFT value was apparently meant to be set
> at compile time to a machine specific value. This was always broken
> for multiplatform configurations with conflicting requirements, and
> in the mainline kernel it was set to 0 anyway. Leave it defined
> locally as 0 but rename it to something without the CONFIG_ prefix.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v3: include linux/gpio/consumer.h to avoid build failure without GPIOLIB
> v2: replace CONFIG_WIZNET_BUS_SHIFT with a constant
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  .../devicetree/bindings/net/wiznet,w5x00.txt  |  4 +-

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/net/ethernet/wiznet/w5100-spi.c       | 21 ++-----
>  drivers/net/ethernet/wiznet/w5100.c           | 61 ++++++++++---------
>  drivers/net/ethernet/wiznet/w5100.h           |  3 +-
>  drivers/net/ethernet/wiznet/w5300.c           | 54 ++++++++--------
>  include/linux/platform_data/wiznet.h          | 23 -------
>  6 files changed, 71 insertions(+), 95 deletions(-)
>  delete mode 100644 include/linux/platform_data/wiznet.h