i3c: renesas: Add runtime PM support

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On the SoCs where the Renesas I3C driver is enabled (RZ/G3S and RZ/G3E),
the clocks of the IP are managed through a clock PM domain. To keep the
I3C code simpler, the explicit clock handling was dropped along with the
addition of runtime PM support, in favor of the runtime PM APIs. Only the
code for getting tclk was preserved, as it is necessary to compute the
I3C clock rate.

All the APIs provided to the I3C subsystem through struct
i3c_master_controller_ops are guarded with runtime PM APIs to
enable/disable the controller at runtime.

As the Renesas I3C driver implements an asynchronous transmit model by
preparing a transfer and waiting for its completion through the ISR,
renesas_i3c_abort_xfer() was added to disable interrupts and clear any
pending IRQ status bits when there is no completion in the defined
timeout. Along with this, renesas_i3c_wait_xfer() return type was changed
to unsigned long.

Add runtime PM support for the Renesas I3C driver.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20260713130545.568657-18-claudiu.beznea+renesas@tuxon.dev
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Claudiu Beznea 2026-07-13 16:05:45 +03:00 • committed by Alexandre Belloni

parent 46fa00a6c4

commit 4af1aacc58

1 changed files with 112 additions and 28 deletions

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drivers/i3c/master/renesas-i3c.c

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