diff options
| author | Wenyou Yang <wenyou.yang@atmel.com> | 2014-12-11 15:31:09 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-10 07:39:16 -0800 |
| commit | 8b46b06abddf8b3b1b1de135c948d49a6974545e (patch) | |
| tree | 08a56a35e028567108ff413e85874c2823d4d3bb /arch | |
| parent | 8b247933c68f89988d7228192e6bb6c496c8d136 (diff) | |
ARM: at91: board-dt-sama5: add phy_fixup to override NAND_Tree
[ Upstream commit b8659752c37ec157ee254cff443b1c9d523aea22 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-at91/board-dt-sama5.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/board-dt-sama5.c b/arch/arm/mach-at91/board-dt-sama5.c index 129e2917506b..5e4cedfa5c51 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> @@ -27,8 +28,25 @@ #include "at91_aic.h" #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); } |