本帖最后由 一只耳朵怪 于 2018-6-21 15:34 编辑
平台AM3352内部RTC
设置硬件时钟以后，系统供电情况下，时钟正常，系统供电无效，单3V电池供电下，时钟保持原来的值，不在走？
请问大神有没有了解的？貌似有说是软件bug，升级就好？从哪里弄升级补丁呢？
附board_AM335xevm.c RTC部分代码
- ：/*
- 334 RTC ***************************************************************************
- 335 */
- 336 static struct resource am335x_rtc_resources[] = [
- 337 [
- 338 .start = AM33XX_RTC_BASE,
- 339 .end = AM33XX_RTC_BASE + SZ_4K - 1,
- 340 .flags = IORESOURCE_MEM,
- 341 ],
- 342 [ /* timer irq */
- 343 .start = AM33XX_IRQ_RTC_TIMER,
- 344 .end = AM33XX_IRQ_RTC_TIMER,
- 345 .flags = IORESOURCE_IRQ,
- 346 ],
- 347 [ /* alARM irq */
- 348 .start = AM33XX_IRQ_RTC_ALARM,
- 349 .end = AM33XX_IRQ_RTC_ALARM,
- 350 .flags = IORESOURCE_IRQ,
- 351 ],
- 352 ];
- 353
- 354 static struct platform_device am335x_rtc_device = [
- 355 .name = "omap_rtc",
- 356 .id = -1,
- 357 .num_resources = ARRAY_SIZE(am335x_rtc_resources),
- 358 .resource = am335x_rtc_resources,
- 359 ];
- 360
- 361 static int am335x_rtc_init(void)
- 362 [
- 363 void __iomem *base;
- 364 struct clk *clk;
- 365
- 366 clk = clk_get(NULL, "rtc_fck");
- 367 if (IS_ERR(clk)) [ if (clk_enable(clk)) [
- 373 pr_err("rtc: Clock Enable Failedn");
- 374 return -1;
- 375 ]
- 376
- 377 base = ioremap(AM33XX_RTC_BASE, SZ_4K);
- 378
- 379 if (WARN_ON(!base))
- 380 return -ENOMEM;
- 381
- 382 /* Unlock the rtc's registers */
- 383 __raw_writel(0x83e70b13, base + 0x6c);
- 384 __raw_writel(0x95a4f1e0, base + 0x70);
- 385
- 386 /*
- 387 * Enable the 32K OSc
- 388 * TODO: Need a better way to handle this
- 389 * Since we want the clock to be running before mmc init
- 390 * we need to do it before the rtc probe happens
- 391 */
- 392 __raw_writel(0x48, base + 0x54);
- 393 iounmap(base);
- 394
- 395 return platform_device_register(&am335x_rtc_device);
- 396 ]
- 368 pr_err("rtc : Failed to get RTC clockn");
- 369 return -1;
- 370 ]
-
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