linux-kernel - Re: [PATCH v6 3/5] net: ax88796c: ASIX AX88796C SPI Ethernet Adapter Driver

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Date:   Fri, 13 Nov 2020 12:35:08 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Łukasz Stelmach <l.stelmach@...sung.com>
Cc:     Andrew Lunn <andrew@...n.ch>, jim.cromie@...il.com,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Bartłomiej Żolnierkiewicz 
        <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v6 3/5] net: ax88796c: ASIX AX88796C SPI Ethernet
 Adapter Driver

On Thu, 12 Nov 2020 12:51:04 +0100 Łukasz Stelmach wrote:
> ASIX AX88796[1] is a versatile ethernet adapter chip, that can be
> connected to a CPU with a 8/16-bit bus or with an SPI. This driver
> supports SPI connection.
> 
> The driver has been ported from the vendor kernel for ARTIK5[2]
> boards. Several changes were made to adapt it to the current kernel
> which include:
> 
> + updated DT configuration,
> + clock configuration moved to DT,
> + new timer, ethtool and gpio APIs,
> + dev_* instead of pr_* and custom printk() wrappers,
> + removed awkward vendor power managemtn.
> + introduced ethtool tunable to control SPI compression
> 
> [1] https://www.asix.com.tw/products.php?op=pItemdetail&PItemID=104;65;86&PLine=65
> [2] https://git.tizen.org/cgit/profile/common/platform/kernel/linux-3.10-artik/
> 
> The other ax88796 driver is for NE2000 compatible AX88796L chip. These
> chips are not compatible. Hence, two separate drivers are required.
> 
> Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>

Please make sure the new code builds cleanly with W=1 C=1

../drivers/net/ethernet/asix/ax88796c_ioctl.c:221:19: warning: initialized field overwritten [-Woverride-init]
  221 |  .get_msglevel  = ax88796c_ethtool_getmsglevel,
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/ethernet/asix/ax88796c_ioctl.c:221:19: note: (near initialization for ‘ax88796c_ethtool_ops.get_msglevel’)
../drivers/net/ethernet/asix/ax88796c_ioctl.c:222:19: warning: initialized field overwritten [-Woverride-init]
  222 |  .set_msglevel  = ax88796c_ethtool_setmsglevel,
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/ethernet/asix/ax88796c_ioctl.c:222:19: note: (near initialization for ‘ax88796c_ethtool_ops.set_msglevel’)
In file included from ../drivers/net/ethernet/asix/ax88796c_main.h:15,
                 from ../drivers/net/ethernet/asix/ax88796c_ioctl.c:16:
../drivers/net/ethernet/asix/ax88796c_spi.h:25:17: warning: ‘tx_cmd_buf’ defined but not used [-Wunused-const-variable=]
   25 | static const u8 tx_cmd_buf[4] = {AX_SPICMD_WRITE_TXQ, 0xFF, 0xFF, 0xFF};
      |                 ^~~~~~~~~~