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

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Message-ID: <20250120102117538ef59b@mail.local>
Date: Mon, 20 Jan 2025 11:21:17 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
	Peng Fan <peng.fan@....com>
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.

> Signed-off-by: Peng Fan <peng.fan@....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@....com>
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com