S905X 7.1 RTC_AM1805 移植 F&Q

由于S912 和 S905X 的 i2c 总线不一样，然后修改DTS 中的i2c 配置后连设备都找不到。后面还是修改驱动，在驱动中添加i2c 判断：

+++ b/drivers/amlogic/rtc/rtc_am1805.c
@@ -1106,34 +1106,42 @@ static int rtc_am1805_probe(struct platform_device *pdev)
    unsigned int i2c_index;
    const char *str;
    unsigned long init_data = 0;
-
+       RTC_DBG(RTC_DBG_VAL, "rtc_am1805 -- rtc_am1805_probe\n");
+       pr_info("[%s] %d:rtc_am1805_probe!\n", __func__, __LINE__);
    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    if (!priv)
            return -ENOMEM;
-
    priv->i2c_bus_index = 0xff;
    priv->dev = &pdev->dev;
-
 /* for i2c bus */
+       pr_info("[%s] %d:rtc_am1805_probe!\n", __func__, __LINE__);
    ret = of_property_read_string(node, "i2c_bus", &str);
    if (ret) {
            pr_info("[%s]: faild to get i2c_bus str!\n", __func__);
            goto out;
    } else {
-               if (!strncmp(str, "i2c_bus_ao", 9))
+               pr_info("[%s] %d:rtc_am1805_probe!\n", __func__, __LINE__);
+               if (!strncmp(str, "i2c_bus_ao", 9)) {
                i2c_index = AML_I2C_MASTER_AO;
-               else if (!strncmp(str, "i2c_bus_a", 9))
+                       priv->i2c_bus_index = AML_I2C_MASTER_AO;
+               } else if (!strncmp(str, "i2c_bus_a", 9)) {
                    i2c_index = AML_I2C_MASTER_A;
-               else if (!strncmp(str, "i2c_bus_b", 9))
+                       priv->i2c_bus_index = AML_I2C_MASTER_A;
+               } else if (!strncmp(str, "i2c_bus_b", 9)) {
                    i2c_index = AML_I2C_MASTER_B;
-               else if (!strncmp(str, "i2c_bus_c", 9))
+                       priv->i2c_bus_index = AML_I2C_MASTER_B;
+               } else if (!strncmp(str, "i2c_bus_c", 9)) {
                    i2c_index = AML_I2C_MASTER_C;
-               else
-               else if (!strncmp(str, "i2c_bus_d", 9))
+                       priv->i2c_bus_index = AML_I2C_MASTER_C;
+               } else if (!strncmp(str, "i2c_bus_d", 9)) {
                        i2c_index = AML_I2C_MASTER_D;
+                       priv->i2c_bus_index = AML_I2C_MASTER_D;
+               } else {
                    goto out;
+               }
+               pr_info("[%s] %d:rtc_am1805_probe!\n", __func__, __LINE__);
+       add_timer(&rtc_info->timer);
    }
-       priv->i2c_bus_index = AML_I2C_MASTER_B;

 #if 0
 /* for alarm irq */
@@ -1247,6 +1255,7 @@ static int rtc_am1805_probe(struct platform_device *pdev)

    return 0;
 out:
+       RTC_DBG(RTC_DBG_VAL, "rtc_am1805 -- goto out\n");
    kfree(priv);
    return ret;
 }
@@ -1299,6 +1308,7 @@ struct platform_driver rtc_am1805_driver = {

static int  __init rtc_am1805_init(void)
{
+       RTC_DBG(RTC_DBG_VAL, "rtc_am1805 --rtc_am1805_init new\n");
    RTC_DBG(RTC_DBG_VAL, "rtc_am1805 --rtc_am1805_init\n");
    return platform_driver_register(&rtc_am1805_driver);
}

DTS 修改：

  rtc {
      compatible = "amlogic, rtc_am1805";
      dev_name = "rtc_am1805";
      status = "okay";
      reg = <0x69>;                                       /** device i2c address, must have        */
      i2c_bus = "i2c_bus_ao";
      init_date = "2015/01/01";
  };
  ```
  
  
#移植完经测试发现rtc 的时间不能保存，查看log发现 获取时间判断：

static int get_rtc_am1805_status(void)
return -1;
if (ptime.month > 12)
return -1;

•   if (ptime.day > rtc_month_days(ptime.month, ptime.year)){
  

•       pr_err("%s days err.",__func__);
  

•   return -1;
  

• }

•   if (ptime.day > 31) {
  

•           pr_err("%s days err.", __func__);
  

•           return -1;
  

•   }