linux-kernel - Re: [PATCH v4 1/4] serial: sh-sci: Update the suspend/resume support

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Message-ID: <04fde244-006f-4bda-9d65-7957be74f049@kernel.org>
Date: Tue, 21 Jan 2025 09:54:07 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Claudiu <claudiu.beznea@...on.dev>, geert+renesas@...der.be,
 magnus.damm@...il.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, gregkh@...uxfoundation.org, jirislaby@...nel.org,
 p.zabel@...gutronix.de, claudiu.beznea.uj@...renesas.com,
 wsa+renesas@...g-engineering.com, prabhakar.mahadev-lad.rj@...renesas.com
Cc: linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 1/4] serial: sh-sci: Update the suspend/resume support

On 20/01/2025 14:09, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> The Renesas RZ/G3S supports a power saving mode where power to most of the
> SoC components is turned off. When returning from this power saving mode,
> SoC components need to be re-configured.
> 
> The SCIFs on the Renesas RZ/G3S need to be re-configured as well when
> returning from this power saving mode. The sh-sci code already configures
> the SCIF clocks, power domain and registers by calling uart_resume_port()
> in sci_resume(). On suspend path the SCIF UART ports are suspended
> accordingly (by calling uart_suspend_port() in sci_suspend()). The only
> missing setting is the reset signal. For this assert/de-assert the reset
> signal on driver suspend/resume.
> 
> In case the no_console_suspend is specified by the user, the registers need
> to be saved on suspend path and restore on resume path. To do this the
> sci_console_setup() function was added. There is no need to cache/restore
> the status or FIFO registers. Only the control registers. To differentiate
> b/w these, the struct sci_port_params::regs was updated with a new member
> that specifies if the register needs to be chached on suspend. Only the
> RZ_SCIFA instances were updated with this new support as the hardware for
> the rest of variants was missing for testing.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
> 
> Changes in v4:
> - none


Why are you combining serial patches with DTS? Greg applies entire set
thus you *cannot* send him DTS.

Best regards,
Krzysztof