hello CN_MKLS_YUAN,
so, you would like to configure GPIO3_PJ.04, 05, 06, 07 to I2S.
please check [Table 17 Audio Pin Descriptions] in Jetson Nano Module Data Sheet. I2S0 pins on the SOM map to I2S4/DAP4 on the chip. you should also see the updates to change it from rsvd1 to i2s4b.
nvidia,function = "i2s4b";
it might be the issue that pinmux changes done in DTSI doesn’t take affect.
could you please also apply the changes as below. pinmux-config-p3450-porg.h
this should enable AUD_MCLK and I2S4 via 40 pin header.
for example,
diff --git a/board/nvidia/p3450-porg/pinmux-config-p3450-porg.h b/board/nvidia/p3450-porg/pinmux-config-p3450-porg.h
index 49df131..bd1bf08 100644
--- a/board/nvidia/p3450-porg/pinmux-config-p3450-porg.h
+++ b/board/nvidia/p3450-porg/pinmux-config-p3450-porg.h
@@ -52,10 +52,6 @@
GPIO_INIT(I, 0, OUT0),
GPIO_INIT(I, 1, OUT1),
GPIO_INIT(I, 2, OUT0),
- GPIO_INIT(J, 4, IN),
- GPIO_INIT(J, 5, IN),
- GPIO_INIT(J, 6, IN),
- GPIO_INIT(J, 7, IN),
GPIO_INIT(S, 5, IN),
GPIO_INIT(S, 7, OUT0),
GPIO_INIT(T, 0, OUT0),
@@ -70,7 +66,6 @@
GPIO_INIT(Z, 0, IN),
GPIO_INIT(Z, 2, IN),
GPIO_INIT(Z, 3, OUT0),
- GPIO_INIT(BB, 0, IN),
GPIO_INIT(CC, 4, IN),
GPIO_INIT(CC, 7, OUT1),
GPIO_INIT(DD, 0, IN),
@@ -148,6 +143,10 @@
PINCFG(GEN1_I2C_SCL_PJ1, I2C1, NORMAL, NORMAL, INPUT, DISABLE, HIGH),
PINCFG(GEN2_I2C_SCL_PJ2, I2C2, NORMAL, NORMAL, INPUT, DISABLE, HIGH),
PINCFG(GEN2_I2C_SDA_PJ3, I2C2, NORMAL, NORMAL, INPUT, DISABLE, HIGH),
+ PINCFG(DAP4_FS_PJ4, I2S4B, DOWN, NORMAL, INPUT, DISABLE, DEFAULT),
+ PINCFG(DAP4_DIN_PJ5, I2S4B, DOWN, NORMAL, INPUT, DISABLE, DEFAULT),
+ PINCFG(DAP4_DOUT_PJ6, I2S4B, DOWN, NORMAL, OUTPUT, DISABLE, DEFAULT),
+ PINCFG(DAP4_SCLK_PJ7, I2S4B, DOWN, NORMAL, INPUT, DISABLE, DEFAULT),
PINCFG(PK0, RSVD2, DOWN, TRISTATE, OUTPUT, DISABLE, DEFAULT),
PINCFG(PK1, RSVD2, DOWN, TRISTATE, OUTPUT, DISABLE, DEFAULT),
PINCFG(PK2, RSVD2, DOWN, TRISTATE, OUTPUT, DISABLE, DEFAULT),
@@ -216,7 +215,7 @@
PINCFG(DAP2_SCLK_PAA1, I2S2, NORMAL, NORMAL, INPUT, DISABLE, DEFAULT),
PINCFG(DAP2_DIN_PAA2, I2S2, NORMAL, NORMAL, INPUT, DISABLE, DEFAULT),
PINCFG(DAP2_DOUT_PAA3, I2S2, NORMAL, NORMAL, INPUT, DISABLE, DEFAULT),
- PINCFG(AUD_MCLK_PBB0, DEFAULT, UP, NORMAL, INPUT, DISABLE, DEFAULT),
+ PINCFG(AUD_MCLK_PBB0, AUD, UP, NORMAL, OUTPUT, DISABLE, DEFAULT),
PINCFG(DVFS_PWM_PBB1, CLDVFS, NORMAL, TRISTATE, OUTPUT, DISABLE, DEFAULT),
PINCFG(DVFS_CLK_PBB2, RSVD0, DOWN, TRISTATE, OUTPUT, DISABLE, DEFAULT),
PINCFG(GPIO_X1_AUD_PBB3, RSVD0, DOWN, TRISTATE, OUTPUT, DISABLE, DEFAULT),