Re: [PATCH 00/12] Add RTC support for Renesas RZ/T2H and RZ/N2H SoCs

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

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Hi,

> The RTC block is closely related to the RZ/N1 implementation and can
> reuse the existing driver infrastructure when operating in SCMP mode,
> which is required on these SoCs due to their 195.3 kHz RTC input clock.

Yes, I implemented SCMP mode because the (back then) upcoming R-Car X5H
also dropped SUBU mode. And SCMP works on my RZ/N1D board as well, so I
could test it already.

> While the RZ/T2H and RZ/N2H variants do not implement the RTCA0SUBU and
> RTCA0TCR registers present on RZ/N1, those registers are not accessed by
> the driver in SCMP mode, allowing support to be added with minimal
> changes.

Note that even for RZ/N1, RTCA0TCR is marked as "not available".

> The RZ/T2H RTC variant also supports a 1 Hz output signal on the
> RTCAT1HZ pin, controlled by the RTCA0CTL1[RTCA01HZE] bit. This bit is
> marked as reserved in the RZ/N1 hardware manual, making RZ/T2H a
> distinct RTC variant despite its overall compatibility with the RZ/N1
> implementation.

R-Car X5H is the same for the above as well.

> The series consists of:
> dt-bindings updates to describe the RZ/T2H and RZ/N2H RTC variants,
> driver updates to recognize the new compatible string and enable
> support for these SoCs.

I will review and test in on my N1D-board today.

Thanks for your work and happy hacking,

   Wolfram


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