linux-kernel - Re: Re: [PATCH 1/4] can: mcp251xfd: stop timestamp before sending chip to sleep

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Message-ID: <ZinnV+GA20LWGUOV@herburgerg-w2>
Date: Thu, 25 Apr 2024 07:17:11 +0200
From: Gregor Herburger <gregor.herburger@...tq-group.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Thomas Kopp <thomas.kopp@...rochip.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux@...tq-group.com,
	alexander.stein@...tq-group.com
Subject: Re: Re: [PATCH 1/4] can: mcp251xfd: stop timestamp before sending chip to
 sleep

On Wed, Apr 24, 2024 at 01:54:54PM +0200, Marc Kleine-Budde wrote:
> On 17.04.2024 15:43:54, Gregor Herburger wrote:
> > MCP2518FD exits Low-Power Mode (LPM) when CS is asserted. When chip
> > is send to sleep and the timestamp workqueue is not stopped chip is
> > waked by SPI transfer of mcp251xfd_timestamp_read.
> 
> How does the Low-Power Mode affect the GPIO lines? Is there a difference
> if the device is only in sleep mode?

The MCP251XFD_REG_IOCON is cleared when leaving Low-Power Mode. This is
why I implemented regcache.

Best regards
Gregor
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