linux-kernel - Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

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Date:	Wed, 18 Feb 2015 16:19:46 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	linux-omap@...r.kernel.org, Kevin Hilman <khilman@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Nishanth Menon <nm@...com>
Subject: Re: [PATCH] ARM: dts: Revert disabling of smc91x for n900

On Tuesday 06 January 2015 00:02:29 Tony Lindgren wrote:
> Revert "ARM: dts: Disable smc91x on n900 until bootloader
> dependency is removed". We've now fixed the issues that
> caused problems with uninitialized hardware depending on
> the bootloader version. Mostly things got fixed with
> the following commits:
> 
> 9a894953a97b ("ARM: dts: Fix bootloader version dependencies
> by muxing n900 smc91x pins") 7d2911c43815 ("net: smc91x: Fix
> gpios for device tree based booting")
> 
> Note that this only affects the early development boards
> with Ethernet that we still have in a few automated boot
> test systems.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> 
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -702,9 +702,6 @@
> 
>  	ethernet@...c {
>  		compatible = "smsc,lan91c94";
> -
> -		status = "disabled";
> -
>  		interrupt-parent = <&gpio2>;
>  		interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;	/* gpio54 */
>  		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300
> */

Hello Tony,

to make smc ethernet working in n900 qemu I needed to apply this patch:

diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index ff36fbe..d96eeb8 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -770,7 +770,8 @@
 		compatible = "smsc,lan91c94";
 		interrupt-parent = <&gpio2>;
 		interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;	/* gpio54 */
-		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300 */
+//		reg = <1 0x300 0xf>;		/* 16 byte IO range at offset 0x300 */
+		reg = <1 0x0 0xf>;		/* 16 byte IO range at offset 0x300 */
 		bank-width = <2>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&ethernet_pins>;

With this patch I see in dmesg:

[   20.577911] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: smc_probe
[   20.580535] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: bank signature probe 
returned 0x3300
[   20.585327] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: revision = 0x3391
[   20.590087] smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@...xnic.net>
[   20.593627] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc_reset
[   20.596832] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc_phy_detect
[   20.611938] smc91x 2000000.ethernet (unnamed net_device) (uninitialized): smc91x: smc_shutdown
[   20.615875] smc91x 2000000.ethernet eth0: SMC91C11xFD (rev 1) at d08be000 IRQ 166
[   20.618682] 
[   20.621124] smc91x 2000000.ethernet eth0: Ethernet addr: 52:54:00:12:34:56
[   20.624938] smc91x 2000000.ethernet eth0: No PHY found

(and eth0 exists in ifconfig)

If I do not apply my patch I got this error message:

[   22.134704] smc91x 2000300.ethernet (unnamed net_device) (uninitialized): smc91x: bank signature probe 
returned 0x0000
[   22.140014] smc91x: not found (-19).

and no ethernet device was registered.

With 2.6.28 kernel with N900 patches (but smc91x is unmodified!) ethernet device is working fine.

-- 
Pali Rohár
pali.rohar@...il.com

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