linux-kernel - Re: [PATCH] wiznet: convert to GPIO descriptors

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Date:   Thu, 26 Jan 2023 20:14:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-gpio@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wiznet: convert to GPIO descriptors

On Thu, Jan 26, 2023 at 02:54:12PM +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.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  .../devicetree/bindings/net/wiznet,w5x00.txt  |  4 +-
>  drivers/net/ethernet/wiznet/w5100-spi.c       | 21 ++-----
>  drivers/net/ethernet/wiznet/w5100.c           | 57 ++++++++++---------
>  drivers/net/ethernet/wiznet/w5100.h           |  3 +-
>  drivers/net/ethernet/wiznet/w5300.c           | 52 ++++++++++-------
>  include/linux/platform_data/wiznet.h          | 23 --------
>  6 files changed, 70 insertions(+), 90 deletions(-)
>  delete mode 100644 include/linux/platform_data/wiznet.h

<...>

>  #include "w5100.h"
>  
> @@ -139,6 +139,12 @@ MODULE_LICENSE("GPL");
>  #define W5500_RX_MEM_START	0x30000
>  #define W5500_RX_MEM_SIZE	0x04000
>  
> +#ifndef CONFIG_WIZNET_BUS_SHIFT
> +#define CONFIG_WIZNET_BUS_SHIFT 0
> +#endif

I don't see any define of CONFIG_WIZNET_BUS_SHIFT in the code, so it looks
like it always zero and can be removed.

Thanks