This reverts TXCLK toggling that was accidently dropped while reworking
commit 2454b719fb87 ("rockchip: rk3288: Add pinctrl support for the gmac
ethernet interface"). So the TX clock is enabled and we can use
GMAC_ROCKCHIP in 1Gbps when basic PINCTRL support is enabled
(!PINTRL_FULL).

Fixes: 2454b719fb87 ("rockchip: rk3288: Add pinctrl support for the...")
Signed-off-by: Romain Perier <romain.per...@collabora.com>
---
 drivers/pinctrl/rockchip/pinctrl_rk3288.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pinctrl/rockchip/pinctrl_rk3288.c 
b/drivers/pinctrl/rockchip/pinctrl_rk3288.c
index ba488f7ce6..47cefc5abf 100644
--- a/drivers/pinctrl/rockchip/pinctrl_rk3288.c
+++ b/drivers/pinctrl/rockchip/pinctrl_rk3288.c
@@ -496,6 +496,10 @@ static void pinctrl_rk3288_gmac_config(struct rk3288_grf 
*grf, int gmac_id)
                             (GPIO_PULL_NORMAL << GPIO_PULL_SHIFT(6)) |
                             (GPIO_PULL_NORMAL << GPIO_PULL_SHIFT(7)));
 
+               rk_clrsetreg(&grf->gpio4bl_iomux,
+                           GPIO4B1_MASK << GPIO4B1_SHIFT,
+                           GPIO4B1_MAC_TXCLK << GPIO4B1_SHIFT);
+
                /* switch GPIO4B1 to 12ma drive-strength */
                rk_clrsetreg(&grf->gpio1_e[3][1],
                             GPIO_BIAS_MASK << GPIO_BIAS_SHIFT(1),
-- 
2.11.0

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