Re: [PATCH 0/4] rtc/scmi: Support multiple RTCs

Peng Fan
2025-02-03T10:44:16Z

Hi Alexandre,

On Tue, Jan 21, 2025 at 02:31:55PM +0000, Peng Fan wrote:
>Hi Alexandre
>
>> Subject: Re: [PATCH 0/4] rtc/scmi: Support multiple RTCs
>>
>> Hello,
>>
>> On 20/01/2025 10:25:32+0800, Peng Fan (OSS) wrote:
>> > i.MX95 System Manager(SM) BBM protocol exports two RTCs for EVK
>> board.
>> > one RTC is SoC internal RTC, the other is board RTC.
>> >
>> > The current driver only use the 1st RTC. With this patchset, both RTCs
>> > could be used in Linux. To achieve this:
>> >
>> > 1. Support more event sources for BBM protocol 2. Add bbm_info
>> hook to
>> > let users could query the number of RTCs 3. Introduce
>> > devm_rtc_allocate_device_priv to support setting rtc device
>> > private information
>> > 4. Update rtc-imx-sm-bbm.c to register both RTCs
>> >
>>
>> I'm sorry but no, you have to register two RTCs like any other system
>> would do.
>
>It is the i.MX SCMI Protocol exports two RTCs using one protocol.
>
>Two RTC devices are created, but share one parent device.
>
>Do you mean each RTC device should have a unique parent device?

Could you please share your ideas on this?

Thanks,
Peng

>
>Thanks,
>Peng.
>
>
>
>
>>
>> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
>> > ---
>> > Peng Fan (4):
>> > firmware: arm_scmi: imx: Support more event sources
>> > firmware: arm_scmi: imx: Introduce bbm_info hook
>> > rtc: Introduce devm_rtc_allocate_device_priv
>> > rtc: imx-sm-bbm: Support multiple RTCs
>> >
>> > drivers/firmware/arm_scmi/vendors/imx/imx-sm-bbm.c | 33
>> ++++++++++-
>> > drivers/rtc/class.c | 9 ++-
>> > drivers/rtc/dev.c | 8 ++-
>> > drivers/rtc/interface.c | 16 ++---
>> > drivers/rtc/proc.c | 2 +-
>> > drivers/rtc/rtc-imx-sm-bbm.c | 69 ++++++++++++++-------
>> -
>> > include/linux/rtc.h | 2 +
>> > include/linux/scmi_imx_protocol.h | 2 +
>> > 8 files changed, 100 insertions(+), 41 deletions(-)
>> > ---
>> > base-commit: e7bb221a638962d487231ac45a6699fb9bb8f9fa
>> > change-id: 20250116-rtc-3834e01786a8
>> >
>> > Best regards,
>> > --
>> > Peng Fan <peng.fan@nxp.com>
>> >
>>
>> --
>> Alexandre Belloni, co-owner and COO, Bootlin
>> Embedded Linux and Kernel engineering
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