linux-kernel - Re: [PATCH v2 2/7] can: m_can: Map WoL to device_set_wakeup

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Message-ID: <15424d0f-9538-402f-bc5d-cdd630c7c5e9@lunn.ch>
Date: Mon, 29 Jul 2024 21:27:04 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Markus Schneider-Pargmann <msp@...libre.com>
Cc: Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	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 <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Martin Hundebøll <martin@...nix.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Michal Kubiak <michal.kubiak@...el.com>,
	Vibhore Vardhan <vibhore@...com>,
	Kevin Hilman <khilman@...libre.com>, Dhruva Gole <d-gole@...com>,
	Conor Dooley <conor@...nel.org>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/7] can: m_can: Map WoL to device_set_wakeup_enable

On Mon, Jul 29, 2024 at 09:41:30AM +0200, Markus Schneider-Pargmann wrote:
> In some devices the pins of the m_can module can act as a wakeup source.
> This patch helps do that by connecting the PHY_WAKE WoL option to
> device_set_wakeup_enable. By marking this device as being wakeup
> enabled, this setting can be used by platform code to decide which
> sleep or poweroff mode to use.
> 
> Also this prepares the driver for the next patch in which the pinctrl
> settings are changed depending on the desired wakeup source.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> ---
>  drivers/net/can/m_can/m_can.c | 37 +++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index 81e05746d7d4..2e4ccf05e162 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -2182,6 +2182,36 @@ static int m_can_set_coalesce(struct net_device *dev,
>  	return 0;
>  }
>  
> +static void m_can_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
> +{
> +	struct m_can_classdev *cdev = netdev_priv(dev);
> +
> +	wol->supported = device_can_wakeup(cdev->dev) ? WAKE_PHY : 0;
> +	wol->wolopts = device_may_wakeup(cdev->dev) ? WAKE_PHY : 0;
> +}

It is nice to see Ethernet WoL mapped to CAN :-)

So will any activity on the CAN BUS wake the device? Or does it need
to be addresses to this device?

	Andrew