DM385 RTC問題

你好，

请问你是否有参考过下面的链接的信息？

您好,

請問在 arch/arm/mach-omap2/i2c.c裡omap2_i2c_mux_pins function中

void __init omap2_i2c_mux_pins(int bus_id)
{
char mux_name[100];

/* First I2C bus is not muxable */

if (bus_id == 1)
return;

if (cpu_is_ti814x() && bus_id == 3) {
sprintf(mux_name, "i2c3_scl_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);
sprintf(mux_name, "i2c3_sda_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);
} else {
sprintf(mux_name, "i2c%i_scl.i2c%i_scl", bus_id-1, bus_id-1);
omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
sprintf(mux_name, "i2c%i_sda.i2c%i_sda", bus_id-1, bus_id-1);
omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
}
}

i2c3的mux_name要怎麼去決定呢?我參考了mux814.c裡的名稱,但不確定是否正確...

Best Regards,

你好,

是的,我是參考那一份文件,在i2c.c裡omap2_i2c_mux_pins中增加一些mux,而名稱亦是參考mux814.c裡的參數.只是不確定我要如何選定哪些參數設定

void __init omap2_i2c_mux_pins(int bus_id)
{
char mux_name[100];

/* First I2C bus is not muxable */

if (bus_id == 1)
return;

if (cpu_is_ti814x() && bus_id == 3) {
sprintf(mux_name, "i2c3_scl_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);
sprintf(mux_name, "i2c3_sda_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);
} else {
sprintf(mux_name, "i2c%i_scl.i2c%i_scl", bus_id-1, bus_id-1);
omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
sprintf(mux_name, "i2c%i_sda.i2c%i_sda", bus_id-1, bus_id-1);
omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
}
}

看起來這樣的設定並不正確,因為系統啟動仍然找不到I2C3後端的設備.請問要怎麼參考設定呢..

你好，

每个I2C instance都有自己的ti814x_i2c_boardinfo，你代码是把原来i2c1的ti814x_i2c_boardinfo修改为i2c3的了么?

你好,

static struct i2c_board_info __initdata ti814x_i2c0_boardinfo[] = {
#ifdef CONFIG_RTC_DRV_BQ32K
{
//I2C_BOARD_INFO("bq32000", 0xD0 >> 1),
I2C_BOARD_INFO("bq32000", 0x68),
},
#endif
};

static struct i2c_board_info __initdata ti814x_i2c1_boardinfo[] = {
#ifdef CONFIG_SND_SOC_TLV320AIC3X
{
I2C_BOARD_INFO("tlv320aic3104", 0x18),
},
#endif
};

static void __init ti814x_evm_i2c_init(void)
{
/* There are 4 instances of I2C in TI814X but currently only one
* instance is being used on the TI8148 EVM
*/
omap_register_i2c_bus(3, 100, ti814x_i2c0_boardinfo,  
ARRAY_SIZE(ti814x_i2c0_boardinfo));
omap_register_i2c_bus(2, 100, ti814x_i2c1_boardinfo,
ARRAY_SIZE(ti814x_i2c1_boardinfo));
}

我將omap_register_i2c_bus(1, 100, ti814x_i2c0_boardinfo, ARRAY_SIZE(ti814x_i2c0_boardinfo)); 改為 

omap_register_i2c_bus(3, 100, ti814x_i2c0_boardinfo, ARRAY_SIZE(ti814x_i2c0_boardinfo));

而boardinfo並沒有改變

另外就是pin mux就是增加了

sprintf(mux_name, "i2c3_scl_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);

sprintf(mux_name, "i2c3_sda_mux3");
omap_mux_init_signal(mux_name, TI814X_PULL_UP);

在開機時有量測了SCL及SDA角位,確實有被拉High.

但就是開機後的bq32k driver還是抓不到後端的設備,所以不清楚是需要哪裡再修改..

你好，

你有回读过pinmux设置的寄存器，看是否生效了么？