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From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Brian Norris <computersforpeace@gmail.com>,
	"David S . Miller" <davem@davemloft.net>
Cc: Jonathan Corbet <corbet@lwn.net>, Sekhar Nori <nsekhar@ti.com>,
	Kevin Hilman <khilman@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Boris Brezillon <boris.brezillon@bootlin.com>,
	Marek Vasut <marek.vasut@gmail.com>,
	Richard Weinberger <richard@nod.at>,
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	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Naren <naren.kernel@gmail.com>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Lukas Wunner <lukas@wunner.de>,
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	Florian Fainelli <f.fainelli@gmail.com>,
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	Paolo Abeni <pabeni@redhat.com>, Alban Bedel <albeu@free.fr>,
	Rob Herring <robh@kernel.org>,
	David Lechner <david@lechnology.com>,
	Andrew Lunn <andrew@lunn.ch>,
	linux-doc <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-i2c <linux-i2c@vger.kernel.org>,
	"open list:MEMORY TECHNOLOGY..." <linux-mtd@lists.infradead.org>,
	Linux-OMAP <linux-omap@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Brian Norris <briannorris@chromium.org>
Subject: Re: [PATCH v2 00/29] at24: remove at24_platform_data
Date: Wed, 3 Oct 2018 22:15:23 +0200
Message-ID: <CAMRc=MejZLV1EQ7uAddsxLY0MTUF8WyiBn=F0ZhkWQJpET0EDQ@mail.gmail.com> (raw)
In-Reply-To: <20180831194643.GA62862@ban.mtv.corp.google.com>

pt., 31 sie 2018 o 21:46 Brian Norris <computersforpeace@gmail.com> napisał(a):
>
> Hi,
>
> On Fri, Aug 10, 2018 at 10:04:57AM +0200, Bartosz Golaszewski wrote:
> > Most boards use the EEPROM to store the MAC address. This series adds
> > support for cell lookups to the nvmem framework, registers relevant
> > cells for all users, adds nvmem support to eth_platform_get_mac_address(),
> > converts davinci_emac driver to using it and replaces at24_platform_data
> > with device properties.
>
> We already have:
>
> of_get_nvmem_mac_address() (which does exactly what you're adding,
> except it's DT specific)
> of_get_mac_address()
> fwnode_get_mac_address()
> device_get_mac_address()
>
> and now you've taught me that this exists too:
>
> eth_platform_get_mac_address()
>
> These mostly don't share code, and with your series, they'll start to
> diverge even more as to what they support. Can you please help rectify
> that, instead of widening the gap?
>
> For instance, you can delete most of eth_platform_get_mac_address() and
> replace it with device_get_mac_address() [1]. And you could add your new
> stuff to fwnode_get_mac_address().
>
> And important part to note here is that you code isn't just useful for
> ethernet -- it could be useful for Wifi devices too. So IMO, sticking it
> only in an "eth" function is the wrong move.
>
> Brian
>
> [1] arch_get_platform_mac_address() is the only part I wouldn't want to
> replicate into a truly generic helper. The following should be a no-op
> refactor, AIUI:
>

The only user of arch_get_platform_mac_address() is sparc. It returns
an address that seems to be read from some kind of EEPROM. I'm not
familiar with this arch though. I'm wondering if we could somehow
seamlessly remove this call and then convert all users of
eth_platform_get_mac_address() to using device_get_mac_address()?

David: I couldn't find a place in sparc code where any ethernet device
would be registered, so is there a chance that nobody is using it?

Best regards,
Bartosz Golaszewski

> diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
> index ee28440f57c5..b738651f71e1 100644
> --- a/net/ethernet/eth.c
> +++ b/net/ethernet/eth.c
> @@ -47,12 +47,12 @@
>  #include <linux/inet.h>
>  #include <linux/ip.h>
>  #include <linux/netdevice.h>
> +#include <linux/property.h>
>  #include <linux/etherdevice.h>
>  #include <linux/skbuff.h>
>  #include <linux/errno.h>
>  #include <linux/init.h>
>  #include <linux/if_ether.h>
> -#include <linux/of_net.h>
>  #include <linux/pci.h>
>  #include <net/dst.h>
>  #include <net/arp.h>
> @@ -528,19 +528,11 @@ unsigned char * __weak arch_get_platform_mac_address(void)
>  int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
>  {
>         const unsigned char *addr;
> -       struct device_node *dp;
>
> -       if (dev_is_pci(dev))
> -               dp = pci_device_to_OF_node(to_pci_dev(dev));
> -       else
> -               dp = dev->of_node;
> -
> -       addr = NULL;
> -       if (dp)
> -               addr = of_get_mac_address(dp);
> -       if (!addr)
> -               addr = arch_get_platform_mac_address();
> +       if (device_get_mac_address(dev, mac_addr, ETH_ALEN))
> +               return 0;
>
> +       addr = arch_get_platform_mac_address();
>         if (!addr)
>                 return -ENODEV;
>

  reply index

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-10  8:04 Bartosz Golaszewski
2018-08-10  8:04 ` [PATCH v2 01/29] nvmem: add support for cell lookups Bartosz Golaszewski
2018-08-24 15:08   ` Boris Brezillon
2018-08-24 15:27     ` Andrew Lunn
2018-08-25  6:27       ` Boris Brezillon
2018-08-27  8:56         ` Bartosz Golaszewski
2018-08-27  9:00           ` Boris Brezillon
2018-08-27 13:37             ` Bartosz Golaszewski
2018-08-27 14:01               ` Boris Brezillon
2018-08-28 10:15               ` Srinivas Kandagatla
2018-08-28 11:56                 ` Bartosz Golaszewski
2018-08-28 13:45                   ` Srinivas Kandagatla
2018-08-28 14:41                     ` Bartosz Golaszewski
2018-08-28 14:48                       ` Srinivas Kandagatla
2018-08-28 14:53                       ` Boris Brezillon
2018-08-28 15:09                         ` Srinivas Kandagatla
2018-08-10  8:04 ` [PATCH v2 02/29] Documentation: nvmem: document lookup entries Bartosz Golaszewski
2018-08-31 20:30   ` Brian Norris
2018-09-01 13:11     ` Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 03/29] nvmem: add a notifier chain Bartosz Golaszewski
2018-08-10  8:33   ` Srinivas Kandagatla
2018-08-10  8:05 ` [PATCH v2 04/29] nvmem: provide nvmem_dev_name() Bartosz Golaszewski
2018-08-10  8:10   ` Srinivas Kandagatla
2018-08-10  8:05 ` [PATCH v2 05/29] nvmem: remove the name field from struct nvmem_device Bartosz Golaszewski
2018-08-10  8:33   ` Srinivas Kandagatla
2018-08-10  8:05 ` [PATCH v2 06/29] mtd: Add support for reading MTD devices via the nvmem API Bartosz Golaszewski
2018-08-17 16:27   ` Boris Brezillon
2018-08-19 11:31     ` Alban
2018-08-19 16:46       ` Boris Brezillon
2018-08-20 10:43         ` Srinivas Kandagatla
2018-08-20 18:20           ` Boris Brezillon
2018-08-20 18:50             ` Bartosz Golaszewski
2018-08-20 19:06               ` Boris Brezillon
2018-08-20 21:27             ` Alban
2018-08-21  5:07               ` Boris Brezillon
2018-08-21  9:50             ` Srinivas Kandagatla
2018-08-21  9:56               ` Boris Brezillon
2018-08-21 10:11                 ` Srinivas Kandagatla
2018-08-21 10:43                   ` Boris Brezillon
2018-08-21 11:39               ` Alban
2018-08-21 12:00                 ` Srinivas Kandagatla
2018-08-21 13:01                   ` Boris Brezillon
2018-08-23 10:29                     ` Alban
2018-08-24 14:39                       ` Boris Brezillon
2018-08-28 10:20                       ` Srinivas Kandagatla
2018-08-20 22:53         ` Alban
2018-08-21  5:44           ` Boris Brezillon
2018-08-21  9:38             ` Srinivas Kandagatla
2018-08-21 11:31               ` Boris Brezillon
2018-08-21 13:34                 ` Srinivas Kandagatla
2018-08-21 13:37                   ` Srinivas Kandagatla
2018-08-21 13:57                     ` Boris Brezillon
2018-08-21 12:27             ` Alban
2018-08-21 12:57               ` Boris Brezillon
2018-08-21 13:57                 ` Alban
2018-08-21 14:26                   ` Boris Brezillon
2018-08-21 14:33                     ` Srinivas Kandagatla
2018-08-10  8:05 ` [PATCH v2 07/29] ARM: davinci: dm365-evm: use nvmem lookup for mac address Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 08/29] ARM: davinci: dm644-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 09/29] ARM: davinci: dm646x-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 10/29] ARM: davinci: da830-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 11/29] ARM: davinci: mityomapl138: add nvmem cells lookup entries Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 12/29] ARM: davinci: da850-evm: use nvmem lookup for mac address Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 13/29] ARM: davinci: da850-evm: remove unnecessary include Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 14/29] net: simplify eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10 14:39   ` Andy Shevchenko
2018-08-10 16:17     ` Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 15/29] net: split eth_platform_get_mac_address() into subroutines Bartosz Golaszewski
2018-08-31 19:54   ` Brian Norris
2018-08-10  8:05 ` [PATCH v2 16/29] net: add support for nvmem to eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 17/29] net: davinci_emac: use eth_platform_get_mac_address() Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 18/29] ARM: davinci: da850-evm: remove dead MTD code Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 19/29] ARM: davinci: mityomapl138: don't read the MAC address from machine code Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 20/29] ARM: davinci: dm365-evm: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 21/29] ARM: davinci: da830-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 22/29] ARM: davinci: dm644x-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 23/29] ARM: davinci: dm646x-evm: " Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 24/29] ARM: davinci: sffsdr: fix the at24 eeprom device name Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 25/29] ARM: davinci: sffsdr: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 26/29] ARM: davinci: remove dead code related to MAC address reading Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 27/29] ARM: davinci: mityomapl138: use nvmem notifiers Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 28/29] ARM: davinci: mityomapl138: use device properties for at24 eeprom Bartosz Golaszewski
2018-08-10  8:05 ` [PATCH v2 29/29] eeprom: at24: kill at24_platform_data Bartosz Golaszewski
2018-08-10  8:41 ` [PATCH v2 00/29] at24: remove at24_platform_data Srinivas Kandagatla
2018-08-31 19:46 ` Brian Norris
2018-10-03 20:15   ` Bartosz Golaszewski [this message]
2018-10-03 20:30     ` Lukas Wunner
2018-10-03 21:04     ` Florian Fainelli
2018-10-04 11:06       ` Bartosz Golaszewski
2018-10-04 13:58         ` Arnd Bergmann
2018-10-04 14:35           ` Sowmini Varadhan
2018-10-04 14:38             ` Arnd Bergmann

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