Hi,
we are working on a custom board based on DM8148 with EZSDK 5.05.02.00 and linux-2.6.37-psp04.04.00.01.
I2c1 on board is enabled by default and we are trying to enable I2c2 (second I2c, not used by M3). After making the required changes when we are trying to read/write to the bus we are getting following error
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
......
we have set the clock register CM_ALWON_I2C_1_CLKCTRL (0x48181568) for the i2c2 to 0x00000002 in the kernel.
but the clock register CM_ALWON_I2C_1_CLKCTRL is getting reset to 0x00030000.
The value of the i2c2 registers are as follows
Register Value
0x4802A000 0x0000000B
0x48028004 0x00005040
0x4802A010 0x00000015
0x4802A020 0x00000000
0x4802A024 0x00000100
0x4802A028 0x00000000
0x4802A02C 0x0000001E
0x4802A030 0x0000001E
0x4802A034 0x00000000
0x4802A038 0x00000000
0x4802A03C 0x00000000
0x4802A040 0x00000000
0x4802A044 0x00000000
0x4802A048 0x00000000
0x4802A04C 0x00000000
0x4802A090(system status) 0x00000001
0x48028094 0x00000000
0x4802A098 0x00000000
0x4802A09C 0x000000F9
0x4802A0A4(I2c_CON) 0x00008000
0x4802A0A8 0x00000000
0x4802A0AC 0x00000007
0x4802A0B0 0x0000000B
0x4802A0B4 0x0000000D
0x4802A0B8 0x0000000F
0x4802A0BC 0x000001E0
0x4802A0C0 0x00008001
0x4802A0C4 0x00000000
0x4802A0C8 0x00000000
0x4802A0CC 0x00000000
0x4802A0D0 0x00000000
0x4802A0D4 0x00000000
pinmux configuration for i2c2 is shown below
root@dm814x-evm:~# cat /sys/kernel/debug/omap_mux/i2c1_sda
name: i2c1_sda.i2c1_sda (0x48140938/0x938 = 0x60001), b NA, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE1
signals: i2c1_sda | NA | NA | NA | NA | NA | NA | NA
root@dm814x-evm:~# cat /sys/kernel/debug/omap_mux/i2c1_scl
name: i2c1_scl.i2c1_scl (0x48140934/0x934 = 0x60001), b NA, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE1
signals: i2c1_scl | NA | NA | NA | NA | NA | NA | NA
we are not getting clock signal on the scl line of the i2c2.
With the same register configuration, we are not getting any signals even at U-boot even after setting CM_ALWON_I2C_1_CLKCTRL and enabling I2C in configuration register. Am I missing something? Is there any patch available to enable I2c2.
kindly help us in resolving the issue.
Regards,
Phani Prasanth
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