Tegra30: Add funcmux for UART over SD slot
Tegra 3 has UART-E exposable via SD card slot which may be
handy for debugging. This change only adds funcmux part, to
use UART-E on the device you additionally would need:
- set stdout-path to serial@70006400 (uarte)
- configure sdmmc1_dat3_py4 and sdmmc1_dat2_py5 pinmux for
uarte
- disable or remove sdhci@7800000 node
- enable CONFIG_TEGRA_ENABLE_UARTE in defconfig
- set CFG_SYS_NS16550_COM to NV_PA_APB_UARTE_BASE in device
header
Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/arch/arm/include/asm/arch-tegra30/funcmux.h b/arch/arm/include/asm/arch-tegra30/funcmux.h
index 2e8b335..0541406 100644
--- a/arch/arm/include/asm/arch-tegra30/funcmux.h
+++ b/arch/arm/include/asm/arch-tegra30/funcmux.h
@@ -16,5 +16,6 @@
/* UART configs */
FUNCMUX_UART1_ULPI = 0,
+ FUNCMUX_UART5_SDMMC1 = 1,
};
#endif /* _TEGRA30_FUNCMUX_H_ */
diff --git a/arch/arm/mach-tegra/board.c b/arch/arm/mach-tegra/board.c
index c382e04..be739c7 100644
--- a/arch/arm/mach-tegra/board.c
+++ b/arch/arm/mach-tegra/board.c
@@ -181,7 +181,7 @@
-1,
-1,
-1,
- -1,
+ FUNCMUX_UART5_SDMMC1, /* UARTE */
#elif defined(CONFIG_TEGRA114)
-1,
-1,
diff --git a/drivers/pinctrl/tegra/funcmux-tegra30.c b/drivers/pinctrl/tegra/funcmux-tegra30.c
index e31b859..5d3403a 100644
--- a/drivers/pinctrl/tegra/funcmux-tegra30.c
+++ b/drivers/pinctrl/tegra/funcmux-tegra30.c
@@ -33,6 +33,22 @@
break;
}
break;
+ case PERIPH_ID_UART5:
+ switch (config) {
+ case FUNCMUX_UART5_SDMMC1:
+ pinmux_set_func(PMUX_PINGRP_SDMMC1_DAT3_PY4,
+ PMUX_FUNC_UARTE);
+ pinmux_set_func(PMUX_PINGRP_SDMMC1_DAT2_PY5,
+ PMUX_FUNC_UARTE);
+
+ pinmux_set_io(PMUX_PINGRP_SDMMC1_DAT3_PY4, PMUX_PIN_OUTPUT);
+ pinmux_set_io(PMUX_PINGRP_SDMMC1_DAT2_PY5, PMUX_PIN_INPUT);
+
+ pinmux_tristate_disable(PMUX_PINGRP_SDMMC1_DAT3_PY4);
+ pinmux_tristate_disable(PMUX_PINGRP_SDMMC1_DAT2_PY5);
+ break;
+ }
+ break;
/* Add other periph IDs here as needed */