netdev - Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

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Message-ID: <20131114110324.GC16396@e106331-lin.cambridge.arm.com>
Date:	Thu, 14 Nov 2013 11:03:24 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Nicolas Pitre <nico@...xnic.net>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration
 so it's usable

On Thu, Nov 14, 2013 at 02:35:30AM +0000, Tony Lindgren wrote:
> Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
> added minimal device tree support to smc91x, but it's not working on
> many platforms because of the lack of some key configuration bits.
> 
> Fix the issue by parsing the necessary configuration like the
> smc911x driver is doing.
> 
> Cc: Nicolas Pitre <nico@...xnic.net>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: netdev@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
> 
> If this looks OK, I'd like to merge this as a fix via arm-soc tree
> along with the other patches in this series as my later patches
> depend on patches in this series.
> 
> ---
>  .../devicetree/bindings/net/smsc-lan91c111.txt     |  4 ++
>  drivers/net/ethernet/smsc/smc91x.c                 | 52 +++++++++++++++++-----
>  2 files changed, 46 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> index 953049b..53d69e3 100644
> --- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> +++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> @@ -8,3 +8,7 @@ Required properties:
>  Optional properties:
>  - phy-device : phandle to Ethernet phy
>  - local-mac-address : Ethernet mac address to use
> +- reg-io-width : Specify the size (in bytes) of the IO accesses that
> +  should be performed on the device.  Valid value for SMSC LAN is
> +  1, 2 or 4.  If it's omitted or invalid, the size would be 2.

In the driver the supported access sizes are not mutually exclusive.  It
would be nice for the binding to have the same property.

> +- smsc,nowait : Setup for fast register access with no waits

I'm confused by what this means. When would this be selected, and when
wouldn't it be?

Thanks,
Mark.
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