[U-Boot] [PATCH v2 1/1] sunxi: Fix A20-OLinuXino-MICRO LAN8710 support

[Stefan Mavrodiev]

>From revision J the board uses new phy chip LAN8710. Compared
with RTL8201, RA17 pin is TXERR. It has pullup which causes phy
not to work. To fix this PA17 is muxed with GMAC function. This
makes the pin output-low.

Signed-off-by: Stefan Mavrodiev <stefan at olimex.com>
---
Changes for v2:
	- The pin mux is done with Kconfig option
	- Same option is enable by default for
	A20-OLinuXino-MICRO boards
 board/sunxi/gmac.c                         | 4 ++++
 configs/A20-OLinuXino_MICRO-eMMC_defconfig | 1 +
 configs/A20-OLinuXino_MICRO_defconfig      | 1 +
 drivers/net/Kconfig                        | 8 ++++++++
 4 files changed, 14 insertions(+)

diff --git a/board/sunxi/gmac.c b/board/sunxi/gmac.c
index 69eb8ff..826650c 100644
--- a/board/sunxi/gmac.c
+++ b/board/sunxi/gmac.c
@@ -33,7 +33,11 @@ void eth_init_board(void)
 
 #ifndef CONFIG_MACH_SUN6I
 	/* Configure pin mux settings for GMAC */
+#ifdef CONFIG_SUN7I_GMAC_FORCE_TXERR
+	for (pin = SUNXI_GPA(0); pin <= SUNXI_GPA(17); pin++) {
+#else
 	for (pin = SUNXI_GPA(0); pin <= SUNXI_GPA(16); pin++) {
+#endif
 #ifdef CONFIG_RGMII
 		/* skip unused pins in RGMII mode */
 		if (pin == SUNXI_GPA(9) || pin == SUNXI_GPA(14))
diff --git a/configs/A20-OLinuXino_MICRO-eMMC_defconfig b/configs/A20-OLinuXino_MICRO-eMMC_defconfig
index 2ff2723..43bcea9 100644
--- a/configs/A20-OLinuXino_MICRO-eMMC_defconfig
+++ b/configs/A20-OLinuXino_MICRO-eMMC_defconfig
@@ -19,6 +19,7 @@ CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_SUN7I_GMAC=y
+CONFIG_SUN7I_GMAC_FORCE_TXERR=y
 CONFIG_AXP_ALDO3_VOLT=2800
 CONFIG_AXP_ALDO4_VOLT=2800
 CONFIG_SCSI=y
diff --git a/configs/A20-OLinuXino_MICRO_defconfig b/configs/A20-OLinuXino_MICRO_defconfig
index 1a0ad5a..22eacb3 100644
--- a/configs/A20-OLinuXino_MICRO_defconfig
+++ b/configs/A20-OLinuXino_MICRO_defconfig
@@ -20,6 +20,7 @@ CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_SUN7I_GMAC=y
+CONFIG_SUN7I_GMAC_FORCE_TXERR=y
 CONFIG_AXP_ALDO3_VOLT=2800
 CONFIG_AXP_ALDO4_VOLT=2800
 CONFIG_SCSI=y
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c1ce54e..f9f04e4 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -244,6 +244,14 @@ config SUN7I_GMAC
 	help
 	  Enable the support for Sun7i GMAC Ethernet controller
 
+config SUN7I_GMAC_FORCE_TXERR
+	bool "Force PA17 as gmac function"
+	depends on SUN7I_GMAC
+	help
+	  Some ethernet phys needs TXERR control. Since the GMAC
+	  doesn't have such signal, setting PA17 as GMAC function
+	  makes the pin output low, which enables data transmission.
+
 config SUN4I_EMAC
 	bool "Allwinner Sun4i Ethernet MAC support"
 	depends on DM_ETH
-- 
2.7.4