RK3288|RK3288下添加PCF8563 RTC支持 RK3288|PCF8563

SOC：RK3288
kernel：Linux4.4
1.添加驱动支持
Device Drivers--->
【RK3288|RK3288下添加PCF8563 RTC支持】[*] Real Time Clock--->
[*]Set system time from RTC on startup and resume(自动同步时间)
<*>Philips PCF8563/Epson RTC8564（CONFIG_RTC_DRV_PCF8563）

2.添加设备树
参考文档：Documentation/devicetree/bindings/rtc/pcf8563.txt
arch/arm/boot/dts/rk3288-firefly.dtsi：

...... rtc_pcf8563: rtc-pcf8563 { clocks = <&pcf8563>; }; sdio_pwrseq: sdio-pwrseq { compatible = "mmc-pwrseq-simple"; //clocks = <&hym8563>; clock-names = "ext_clock"; pinctrl-names = "default"; pinctrl-0 = <&wifi_enable_h>; /* * On the module itself this is one of these (depending * on the actual card populated): * - SDIO_RESET_L_WL_REG_ON * - PDN (power down when low) */ reset-gpios = <&gpio4 28 GPIO_ACTIVE_LOW>; }; ......&i2c0 { pcf8563: pcf8563@51 { compatible = "nxp,pcf8563"; reg = <0x51>; #clock-cells = <0>; }; }; ......

3. 测试
3.1 date 设置时间：date 月日时分年.秒
3.2 同步时间到RTC（把系统时间写到RTC芯片）：hwclock -w
3.3 同步时间到系统（把RTC芯片时间写到系统时间）：hwclock -s