netdev - Re: [PATCH] of_net: add mtd-mac-address support to of_get_mac

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Message-ID: <20190430004845.GA29722@bogus>
Date:   Mon, 29 Apr 2019 19:48:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Petr Štetiar <ynezz@...e.cz>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>
Subject: Re: [PATCH] of_net: add mtd-mac-address support to
 of_get_mac_address()

On Tue, Apr 16, 2019 at 08:01:56PM -0700, Frank Rowand wrote:
> Hi Rob,
> 
> On 4/16/19 5:29 PM, Florian Fainelli wrote:
> > 
> > 
> > On 16/04/2019 13:05, Petr Štetiar wrote:
> >> From: John Crispin <john@...ozen.org>
> >>
> >> Many embedded devices have information such as MAC addresses stored
> >> inside MTD devices. This patch allows us to add a property inside a node
> >> describing a network interface. The new property points at a MTD
> >> partition with an offset where the MAC address can be found.
> >>
> >> This patch has originated in OpenWrt some time ago, so in order to
> >> consider usefulness of this patch, here are some real-world numbers
> >> which hopefully speak for themselves:
> >>
> >>   * mtd-mac-address                used 497 times in 357 device tree files
> >>   * mtd-mac-address-increment      used  74 times in  58 device tree files
> >>   * mtd-mac-address-increment-byte used   1 time  in   1 device tree file
> >>
> >> Signed-off-by: John Crispin <john@...ozen.org>
> >> Signed-off-by: Felix Fietkau <nbd@....name>
> >> [cleanup of the patch for upstream submission]
> >> Signed-off-by: Petr Štetiar <ynezz@...e.cz>
> >> ---
> > 
> > [snip]
> > 
> >> +static const void *of_get_mac_address_mtd(struct device_node *np)
> >> +{
> >> +#ifdef CONFIG_MTD
> >> +    void *addr;
> >> +    size_t retlen;
> >> +    int size, ret;
> >> +    u8 mac[ETH_ALEN];
> >> +    phandle phandle;
> >> +    const char *part;
> >> +    const __be32 *list;
> >> +    struct mtd_info *mtd;
> >> +    struct property *prop;
> >> +    u32 mac_inc = 0;
> >> +    u32 inc_idx = ETH_ALEN-1;
> >> +    struct device_node *mtd_np = NULL;
> > 
> > Reverse christmas tree would look a bit nicer here.
> 
> Do we a variable declaration format preference for drivers/of/*?

We'd better get one. It's all the rage.

How about fallen Christmas tree:

	int a;
	bool fallen;
	char christmas_tree;
	int for_our;
	int dt;

Rob