linux-kernel - [PATCH v3 6/9] can: m_can: Add use of optional regulator

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Message-Id: <20241011-topic-mcan-wakeup-source-v6-12-v3-6-9752c714ad12@baylibre.com>
Date: Fri, 11 Oct 2024 15:16:43 +0200
From: Markus Schneider-Pargmann <msp@...libre.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>, 
 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>
Cc: linux-can@...r.kernel.org, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Matthias Schiffer <matthias.schiffer@...tq-group.com>, 
 Vishal Mahaveer <vishalm@...com>, Kevin Hilman <khilman@...libre.com>, 
 Dhruva Gole <d-gole@...com>, Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH v3 6/9] can: m_can: Add use of optional regulator

Add support to use a regulator for the core. This is optional and used
to register the dependency on the regulator.

Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
---
 drivers/net/can/m_can/m_can.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index c56d61b0d20b05be36c95ec4a6651b0457883b66..b009575354cf5f19e93950bb17d448f81609aae4 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -23,6 +23,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>

 #include "m_can.h"

@@ -2383,6 +2384,11 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 	if (dev->of_node && of_property_read_bool(dev->of_node, "wakeup-source"))
 		device_set_wakeup_capable(dev, true);

+	ret = devm_regulator_get_enable_optional(dev, "vio");
+	if (ret)
+		return ERR_PTR(
+			dev_err_probe(dev, ret, "Failed to get or enable optional regulator\n"));
+
 	/* Get TX FIFO size
 	 * Defines the total amount of echo buffers for loopback
 	 */

-- 
2.45.2