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ARM: at91: board-dt-sama5: add phy_fixup to override NAND_Tree

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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@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Wenyou Yang 2014-12-11 15:31:09 +08:00 committed by Nicolas Ferre
parent 55eb9c343f
commit b8659752c3
1 changed files with 18 additions and 0 deletions
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18
arch/arm/mach-at91/board-dt-sama5.c
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@ -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);
}