linux-kernel - Re: [PATCH] ARM: at91: board-dt-sama5: add phy_fixup to override NAND_Tree which improperly strapp-in during the reset period.

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Date:	Tue, 16 Dec 2014 11:20:41 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Wenyou Yang <wenyou.yang@...el.com>,
	Florian Fainelli <f.fainelli@...il.com>
CC:	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: at91: board-dt-sama5: add phy_fixup to override
 NAND_Tree which improperly strapp-in during the reset period.

Le 11/12/2014 08:31, Wenyou Yang a écrit :
> Appearance: On some SAMA5D4EK boards, after power up, the Eth1 doesn't work.
> 
> Reason: The PIOE2 pin is connected to the NAND_Tree# of KSZ8081,
> But it outputs LOW during the reset period, which cause the NAND_Tree# enabled.
> 
> Add phy_fixup() to disable NAND_Tree by overriding the Operation
> Mode Strap Override register(i.e. Register 16h) to clear the NAND_Tree bit.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>

It seems correct to me.

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

Anyway, I add Florian in the loop as he is the one who proposed this
solution. So it would have been good to have his feeling about the
implementation...

Bye,

> ---
>  arch/arm/mach-at91/board-dt-sama5.c |   18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm/mach-at91/board-dt-sama5.c b/arch/arm/mach-at91/board-dt-sama5.c
> index 8fb9ef5..97f7367 100644
> --- a/arch/arm/mach-at91/board-dt-sama5.c
> +++ b/arch/arm/mach-at91/board-dt-sama5.c
> @@ -17,6 +17,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/phy.h>
>  #include <linux/clk-provider.h>
> +#include <linux/phy.h>
>  
>  #include <asm/setup.h>
>  #include <asm/irq.h>
> @@ -26,8 +27,25 @@
>  
>  #include "generic.h"
>  
> +static int ksz8081_phy_fixup(struct phy_device *phy)
> +{
> +	int value;
> +
> +	value = phy_read(phy, 0x16);
> +	value &= ~0x20;
> +	phy_write(phy, 0x16, value);
> +
> +	return 0;
> +}
> +
>  static void __init sama5_dt_device_init(void)
>  {
> +	if (of_machine_is_compatible("atmel,sama5d4ek") &&
> +	   IS_ENABLED(CONFIG_PHYLIB)) {
> +		phy_register_fixup_for_id("fc028000.etherne:00",
> +						ksz8081_phy_fixup);
> +	}
> +
>  	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
>  }
>  
> 


-- 
Nicolas Ferre
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