ARM: tegra20: add funcmux for exposing UART over uSD slot on Tegra 20
UART-A can be exposed through uSD, this was tested on Transformer T20
but should work on all Ventana-based boards.
TX is exported on SDD pingroup corresponding to uSD CLK pin
RX is exported on SDB which is CMD pin in uSD slot
Signed-off-by: Artur Kowalski <arturkow2000@gmail.com>
Reviewed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/arch/arm/include/asm/arch-tegra20/funcmux.h b/arch/arm/include/asm/arch-tegra20/funcmux.h
index e9e96c1..bafcf85 100644
--- a/arch/arm/include/asm/arch-tegra20/funcmux.h
+++ b/arch/arm/include/asm/arch-tegra20/funcmux.h
@@ -19,6 +19,7 @@
FUNCMUX_UART1_UAA_UAB,
FUNCMUX_UART1_GPU,
FUNCMUX_UART1_SDIO1,
+ FUNCMUX_UART1_SDB_SDD,
FUNCMUX_UART2_UAD = 0,
FUNCMUX_UART4_GMC = 0,
diff --git a/arch/arm/mach-tegra/board.c b/arch/arm/mach-tegra/board.c
index 8c946f0..4835824 100644
--- a/arch/arm/mach-tegra/board.c
+++ b/arch/arm/mach-tegra/board.c
@@ -169,6 +169,8 @@
FUNCMUX_UART1_GPU,
#elif defined(CONFIG_TEGRA_UARTA_SDIO1)
FUNCMUX_UART1_SDIO1,
+ #elif defined(CONFIG_TEGRA_UARTA_SDB_SDD)
+ FUNCMUX_UART1_SDB_SDD,
#else
FUNCMUX_UART1_IRRX_IRTX,
#endif
diff --git a/arch/arm/mach-tegra/tegra20/Kconfig b/arch/arm/mach-tegra/tegra20/Kconfig
index 6367837..a79fdc2 100644
--- a/arch/arm/mach-tegra/tegra20/Kconfig
+++ b/arch/arm/mach-tegra/tegra20/Kconfig
@@ -17,6 +17,9 @@
config TEGRA_UARTA_SDIO1
bool
+config TEGRA_UARTA_SDB_SDD
+ bool
+
choice
prompt "Tegra20 board select"
optional
diff --git a/drivers/pinctrl/tegra/funcmux-tegra20.c b/drivers/pinctrl/tegra/funcmux-tegra20.c
index 951ae19..f60d5aa 100644
--- a/drivers/pinctrl/tegra/funcmux-tegra20.c
+++ b/drivers/pinctrl/tegra/funcmux-tegra20.c
@@ -62,8 +62,15 @@
pinmux_tristate_disable(PMUX_PINGRP_SDIO1);
bad_config = 0;
break;
+ case FUNCMUX_UART1_SDB_SDD:
+ pinmux_set_func(PMUX_PINGRP_SDB, PMUX_FUNC_UARTA);
+ pinmux_set_func(PMUX_PINGRP_SDD, PMUX_FUNC_UARTA);
+ pinmux_tristate_disable(PMUX_PINGRP_SDB);
+ pinmux_tristate_disable(PMUX_PINGRP_SDD);
+ bad_config = 0;
+ break;
}
- if (!bad_config) {
+ if (!bad_config && config != FUNCMUX_UART1_SDB_SDD) {
/*
* Tegra appears to boot with function UARTA pre-
* selected on mux group SDB. If two mux groups are