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charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org Hi Alexandre, Thanks for your reply. On 2024/9/3 04:19, Alexandre Belloni wrote: > [ EXTERNAL EMAIL ] > > On 02/09/2024 16:14:45+0800, Xianwei Zhao wrote: >> Hi Alexandre, >> Thanks for your reply. >> >> On 2024/8/26 17:45, Alexandre Belloni wrote: >>> [ EXTERNAL EMAIL ] >>> >>> On 23/08/2024 17:19:45+0800, Xianwei Zhao via B4 Relay wrote: >>>> From: Yiting Deng >>>> >>>> Support for the on-chip RTC found in some of Amlogic's SoCs such as the >>>> A113L2 and A113X2. >>>> >>>> Signed-off-by: Yiting Deng >>>> Signed-off-by: Xianwei Zhao >>>> --- >>>> drivers/rtc/Kconfig | 12 + >>>> drivers/rtc/Makefile | 1 + >>>> drivers/rtc/rtc-amlogic.c | 589 ++++++++++++++++++++++++++++++++++++++++++++++ >>> >>> As pointed out, this is the third amlogic driver so the name of the file >>> must be more specific. >>> >> >> This RTC hardware includes a timing function and an alarm function. >> But the existing has only timing function, alarm function is using the >> system clock to implement a virtual alarm. And the relevant register access >> method is also different. >> >> The "meson" string is meaningless, it just keeps going, and now the new >> hardware uses the normal naming. > > The proper naming is then definitively not just amlogic, because in 5 > year, you are going to say the exact same thing about this driver > "register access is different, this is for old SoCs, etc" > > amlogc-a4 would be more appropriate. > Will modify driver file name to rtc-amlogic-a4.c >>>> + /* Enable RTC */ >>>> + regmap_write_bits(rtc->map, RTC_CTRL, RTC_ENABLE, RTC_ENABLE); >>> >>> This must not be done at probe time, else you loose the >>> important information taht the time has never been set. Instead, >>> it should only be enabled on the first .set_time invocation do >>> you could now in .read_time that the time is currently invalid. >>> >> There are some doubts about this place. >> >> You mean that after the system is up, unless the time is set, it will fail >> to read the time at any time, and the alarm clock will also fail. >> In this case, the system must set a time. > > Exactly, reading the time must not succeed if the time is known to be > bad. > Got it. >> >> When read time invlalid, system is will set time. >> This part of the logic I see the kernel part has not been implemented, so >> only the user application has been implemented. Whether this is reasonable, >> if not set time, you will never use RTC module. > > This is not going to be implemented in the kernel. The kernel can't know > what is the proper time to set unless userspace tells it. > OK will place enable action in the set_time process. > -- > Alexandre Belloni, co-owner and COO, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic