[U-Boot] [PATCH v1 3/5] apalis/colibri_t30: avoid uart input from floating pins

[Marcel Ziswiler]

From: Marcel Ziswiler <marcel.ziswiler at toradex.com>

Avoid UART input from floating RX pins on UARTB and UARTC (Colibri T30)
and UARTB, UARTC and UARTD (Apalis T30).

Note: Floating pins may cause spurious break conditions potentially
interrupting U-Boot's autoboot.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>

---

 board/toradex/apalis_t30/pinmux-config-apalis_t30.h   | 9 ++++++---
 board/toradex/colibri_t30/pinmux-config-colibri_t30.h | 7 ++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/board/toradex/apalis_t30/pinmux-config-apalis_t30.h b/board/toradex/apalis_t30/pinmux-config-apalis_t30.h
index 8d6696aaad..3a2cf4606e 100644
--- a/board/toradex/apalis_t30/pinmux-config-apalis_t30.h
+++ b/board/toradex/apalis_t30/pinmux-config-apalis_t30.h
@@ -120,7 +120,8 @@ static struct pmux_pingrp_config tegra3_pinmux_common[] = {
 	DEFAULT_PINMUX(ULPI_DATA6_PO7, UARTA, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(ULPI_DATA7_PO0, UARTA, NORMAL, NORMAL, OUTPUT),
 	DEFAULT_PINMUX(ULPI_CLK_PY0, UARTD, NORMAL, NORMAL, OUTPUT),
-	DEFAULT_PINMUX(ULPI_DIR_PY1, UARTD, NORMAL, NORMAL, INPUT),
+	/* UARTD RX, make sure we don't get input form a floating Pin */
+	DEFAULT_PINMUX(ULPI_DIR_PY1, UARTD, UP, NORMAL, INPUT),
 	DEFAULT_PINMUX(ULPI_NXT_PY2, UARTD, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(ULPI_STP_PY3, UARTD, NORMAL, NORMAL, OUTPUT),
 	DEFAULT_PINMUX(DAP3_FS_PP0, I2S2, NORMAL, NORMAL, INPUT),
@@ -189,12 +190,14 @@ static struct pmux_pingrp_config tegra3_pinmux_common[] = {
 	LV_PINMUX(VI_MCLK_PT1, VI, NORMAL, NORMAL, OUTPUT, DISABLE, DISABLE),
 	LV_PINMUX(VI_PCLK_PT0, VI, NORMAL, NORMAL, INPUT, DISABLE, DISABLE),
 	LV_PINMUX(VI_VSYNC_PD6, VI, NORMAL, NORMAL, INPUT, DISABLE, DISABLE),
-	DEFAULT_PINMUX(UART2_RXD_PC3, UARTB, NORMAL, NORMAL, INPUT),
+	/* UARTB RX, make sure we don't get input form a floating Pin */
+	DEFAULT_PINMUX(UART2_RXD_PC3, UARTB, UP, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART2_TXD_PC2, UARTB, NORMAL, NORMAL, OUTPUT),
 	DEFAULT_PINMUX(UART2_RTS_N_PJ6, UARTB, DOWN, TRISTATE, OUTPUT), /* NC */
 	DEFAULT_PINMUX(UART2_CTS_N_PJ5, UARTB, DOWN, TRISTATE, OUTPUT), /* NC */
 	DEFAULT_PINMUX(UART3_TXD_PW6, UARTC, NORMAL, NORMAL, OUTPUT),
-	DEFAULT_PINMUX(UART3_RXD_PW7, UARTC, NORMAL, NORMAL, INPUT),
+	/* UARTC RX, make sure we don't get input form a floating Pin */
+	DEFAULT_PINMUX(UART3_RXD_PW7, UARTC, UP, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART3_CTS_N_PA1, UARTC, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART3_RTS_N_PC0, PWM0, NORMAL, NORMAL, OUTPUT),
 	DEFAULT_PINMUX(PU0, RSVD1, DOWN, TRISTATE, OUTPUT),
diff --git a/board/toradex/colibri_t30/pinmux-config-colibri_t30.h b/board/toradex/colibri_t30/pinmux-config-colibri_t30.h
index c583583b3f..5ac1a6da97 100644
--- a/board/toradex/colibri_t30/pinmux-config-colibri_t30.h
+++ b/board/toradex/colibri_t30/pinmux-config-colibri_t30.h
@@ -180,7 +180,8 @@ static struct pmux_pingrp_config tegra3_pinmux_common[] = {
 	LV_PINMUX(VI_D7_PL5, SDMMC2, NORMAL, NORMAL, INPUT, DISABLE, DISABLE),
 	LV_PINMUX(VI_D10_PT2, RSVD1, NORMAL, NORMAL, INPUT, DISABLE, DISABLE),
 	LV_PINMUX(VI_MCLK_PT1, VI, UP, NORMAL, INPUT, DISABLE, DISABLE),
-	DEFAULT_PINMUX(UART2_RXD_PC3, UARTB, NORMAL, NORMAL, INPUT),
+	/* UARTC RX, make sure we don't get input form a floating Pin */
+	DEFAULT_PINMUX(UART2_RXD_PC3, UARTB, UP, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART2_TXD_PC2, UARTB, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART2_RTS_N_PJ6, GMI, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(UART2_CTS_N_PJ5, GMI, NORMAL, NORMAL, INPUT),
@@ -207,11 +208,11 @@ static struct pmux_pingrp_config tegra3_pinmux_common[] = {
 	DEFAULT_PINMUX(GMI_AD8_PH0, PWM0, NORMAL, NORMAL, OUTPUT), /* LCD1_BL_PWM */
 	DEFAULT_PINMUX(GMI_AD10_PH2, NAND, NORMAL, NORMAL, OUTPUT), /* LCD1_BL_EN */
 	DEFAULT_PINMUX(GMI_A16_PJ7, UARTD, NORMAL, NORMAL, INPUT),
-	DEFAULT_PINMUX(GMI_A17_PB0, UARTD, NORMAL, NORMAL, INPUT),
+	/* UARTB RX, make sure we don't get input form a floating Pin */
+	DEFAULT_PINMUX(GMI_A17_PB0, UARTD, UP, NORMAL, INPUT),
 	DEFAULT_PINMUX(GMI_A18_PB1, UARTD, NORMAL, NORMAL, INPUT),
 	DEFAULT_PINMUX(GMI_A19_PK7, UARTD, NORMAL, NORMAL, INPUT),
 
-
 	/* Multiplexed with KB_ROW10/KB_ROW11/KB_ROW12/KB_ROW15 */
 	DEFAULT_PINMUX(CAM_MCLK_PCC0, VI_ALT2, UP, TRISTATE, INPUT),
 	DEFAULT_PINMUX(PCC1, RSVD1, NORMAL, TRISTATE, INPUT),
-- 
2.21.0