Re: [PATCH v5 17/17] i3c: renesas: Add runtime PM support

[Frank Li <Frank.li@oss.nxp.com>]

On Mon, Jul 13, 2026 at 04:05:45PM +0300, Claudiu Beznea wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>
> 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>
> ---
>
> Changes in v5:
> - updated renesas_i3c_irqs_mask_and_clear() to use the
>   renesas_i3c_irqs_mask_and_clear_locked() introduced in patch 1 from
>   this series
>
> Changes in v4:
> - renamed renesas_i3c_abort_xfer() from v3 to
>   renesas_i3c_irqs_mask_and_clear(); along with it renamed local varibles
>   abort_xfer to xfer_failed
>
> Changes in v3:
> - dropped the RPM resume/suspend in renesas_i3c_suspend() to read the
>   DATBASn registers as the DATBASn register are not used on suspend/resume
>   path anymore in this version
>
> Changes in v2:
> - dropped the runtime suspend/resume functions as for now, there will be
>   no pinctrl sleep state described in DT
> - do not synchronize the IRQs in renesas_i3c_abort_xfer() as some handlers
>   may re-enable interrupts; instead just disable the interrupts and clean
>   any status bits that the IRQ handlers are touching; with this the
>   struct renesas_i3c::{irqs, num_irqs} and the associated code was removed
> - dropped the renesas_i3c_dont_use_autosuspend() along with the
>   devm_add_action_or_reset() call to set it since the same operation is
>   done by the devres cleanup helper of devm_pm_runtime_enable()
> - adjusted the renesas_i3c_suspend() with RPM calls to save the DATBAS
>   registers
> - use pm_runtime_resume_and_get() in renesas_i3c_resume() to avoid
>   mixing gotos with cleanup helpers
> - adjusted the patch description to reflect these changes
>
...
>
> @@ -1384,12 +1458,16 @@ static int renesas_i3c_probe(struct platform_device *pdev)
>  	if (IS_ERR(i3c->regs))
>  		return PTR_ERR(i3c->regs);
>
> -	ret = devm_clk_bulk_get_all_enabled(&pdev->dev, &i3c->clks);
> -	if (ret <= RENESAS_I3C_TCLK_IDX)
> -		return dev_err_probe(&pdev->dev, ret < 0 ? ret : -EINVAL,
> -				     "Failed to get clocks (need > %d, got %d)\n",
> -				     RENESAS_I3C_TCLK_IDX, ret);
> -	i3c->num_clks = ret;
> +	i3c->tclk = devm_clk_get(&pdev->dev, "tclk");

only one tclk? you remove devm_clk_bulk_get_all_enabled()

Frank