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Tegra30: Add funcmux for UART over SD slot

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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>
This commit is contained in:
Jonas Schwöbel 2024-01-22 14:40:27 +02:00 • committed by Svyatoslav Ryhel
parent 5e13730fc6
commit b515d7ae0d
3 changed files with 18 additions and 1 deletions
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1
arch/arm/include/asm/arch-tegra30/funcmux.h
View file

@ -16,5 +16,6 @@ enum {
/* UART configs */
FUNCMUX_UART1_ULPI = 0,
FUNCMUX_UART5_SDMMC1 = 1,
};
#endif /* _TEGRA30_FUNCMUX_H_ */

2
arch/arm/mach-tegra/board.c
View file

@ -181,7 +181,7 @@ static int uart_configs[] = {
-1,
-1,
-1,
-1,
FUNCMUX_UART5_SDMMC1, /* UARTE */
#elif defined(CONFIG_TEGRA114)
-1,
-1,

16
drivers/pinctrl/tegra/funcmux-tegra30.c
View file

@ -33,6 +33,22 @@ int funcmux_select(enum periph_id id, int config)
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 */