linux-kernel - [PATCH can-next v3 2/3] can: tcan4x5x: add deinit callback to set standby mode

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Message-Id: <20241122-tcan-standby-v3-2-90bafaf5eccd@geanix.com>
Date: Fri, 22 Nov 2024 15:52:23 +0100
From: Sean Nyekjaer <sean@...nix.com>
To: 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>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Sean Nyekjaer <sean@...nix.com>
Subject: [PATCH can-next v3 2/3] can: tcan4x5x: add deinit callback to set
 standby mode

At Vsup 12V, standby mode will save 7-8mA, when the interface is
down.

Signed-off-by: Sean Nyekjaer <sean@...nix.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 7213d9894c82d079bf92f1ec62d4eebb500cdfa4..13014be4ab37d24680d25806de642a9c5c197020 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -279,6 +279,14 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
 	return ret;
 }

+static int tcan4x5x_deinit(struct m_can_classdev *cdev)
+{
+	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
+
+	return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
+				  TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY);
+};
+
 static int tcan4x5x_disable_wake(struct m_can_classdev *cdev)
 {
 	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
@@ -377,6 +385,7 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,

 static const struct m_can_ops tcan4x5x_ops = {
 	.init = tcan4x5x_init,
+	.deinit = tcan4x5x_deinit,
 	.read_reg = tcan4x5x_read_reg,
 	.write_reg = tcan4x5x_write_reg,
 	.write_fifo = tcan4x5x_write_fifo,

-- 
2.46.2