ARM: rockchip: rk3188: enable pull-ups on UART RX pins

The default behaviour of the uart-rx pins on the rk3188 is to be pulled up and
a lot of designs use diodes to even prevent them from being raised from the
outside.

Therefore change the rx-pin settings accordingly.

This also fixes a uart receive problem on mass production Radxa Rock boards.

Signed-off-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index bb36596..ed9a70a 100644 (file)
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -149,7 +149,7 @@
 
                        uart0 {
                                uart0_xfer: uart0-xfer {
-                                       rockchip,pins = <RK_GPIO1 0 RK_FUNC_1 &pcfg_pull_none>,
+                                       rockchip,pins = <RK_GPIO1 0 RK_FUNC_1 &pcfg_pull_up>,
                                                        <RK_GPIO1 1 RK_FUNC_1 &pcfg_pull_none>;
                                };
 
@@ -164,7 +164,7 @@
 
                        uart1 {
                                uart1_xfer: uart1-xfer {
-                                       rockchip,pins = <RK_GPIO1 4 RK_FUNC_1 &pcfg_pull_none>,
+                                       rockchip,pins = <RK_GPIO1 4 RK_FUNC_1 &pcfg_pull_up>,
                                                        <RK_GPIO1 5 RK_FUNC_1 &pcfg_pull_none>;
                                };
 
@@ -179,7 +179,7 @@
 
                        uart2 {
                                uart2_xfer: uart2-xfer {
-                                       rockchip,pins = <RK_GPIO1 8 RK_FUNC_1 &pcfg_pull_none>,
+                                       rockchip,pins = <RK_GPIO1 8 RK_FUNC_1 &pcfg_pull_up>,
                                                        <RK_GPIO1 9 RK_FUNC_1 &pcfg_pull_none>;
                                };
                                /* no rts / cts for uart2 */
@@ -187,7 +187,7 @@
 
                        uart3 {
                                uart3_xfer: uart3-xfer {
-                                       rockchip,pins = <RK_GPIO1 10 RK_FUNC_1 &pcfg_pull_none>,
+                                       rockchip,pins = <RK_GPIO1 10 RK_FUNC_1 &pcfg_pull_up>,
                                                        <RK_GPIO1 11 RK_FUNC_1 &pcfg_pull_none>;
                                };