linux-kernel - [PATCH can-next v3 2/2] can: tcan4x5x: add option for selecting nWKRQ voltage

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Message-Id: <20241112-tcan-wkrqv-v3-2-c66423fba26d@geanix.com>
Date: Tue, 12 Nov 2024 15:39:40 +0100
From: Sean Nyekjaer <sean@...nix.com>
To: 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>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Sean Nyekjaer <sean@...nix.com>
Subject: [PATCH can-next v3 2/2] can: tcan4x5x: add option for selecting
 nWKRQ voltage

nWKRQ supports an output voltage of either the internal reference voltage
(3.6V) or the reference voltage of the digital interface 0 - 6V (VIO).
Add the devicetree option ti,nwkrq-voltage-vio to set it to VIO.
Unset nWKRQ is kept at internal reference voltage.

Signed-off-by: Sean Nyekjaer <sean@...nix.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 20 ++++++++++++++++++++
 drivers/net/can/m_can/tcan4x5x.h      |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2f73bf3abad889c222f15c39a3d43de1a1cf5fbb..12a375c653cbd255b5dc85faf2f76de397a644ec 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -92,6 +92,8 @@
 #define TCAN4X5X_MODE_STANDBY BIT(6)
 #define TCAN4X5X_MODE_NORMAL BIT(7)

+#define TCAN4X5X_NWKRQ_VOLTAGE_VIO BIT(19)
+
 #define TCAN4X5X_DISABLE_WAKE_MSK	(BIT(31) | BIT(30))
 #define TCAN4X5X_DISABLE_INH_MSK	BIT(9)

@@ -267,6 +269,13 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;

+	if (tcan4x5x->nwkrq_voltage_vio) {
+		ret = regmap_set_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
+				      TCAN4X5X_NWKRQ_VOLTAGE_VIO);
+		if (ret)
+			return ret;
+	}
+
 	return ret;
 }

@@ -318,6 +327,15 @@ static const struct tcan4x5x_version_info
 	return &tcan4x5x_versions[TCAN4X5X];
 }

+static void tcan4x5x_get_dt_data(struct m_can_classdev *cdev)
+{
+	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
+	struct device_node *np = cdev->dev->of_node;
+
+	if (of_property_read_bool(np, "ti,nwkrq-voltage-vio"))
+		tcan4x5x->nwkrq_voltage_vio = true;
+}
+
 static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
 			      const struct tcan4x5x_version_info *version_info)
 {
@@ -453,6 +471,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 		goto out_power;
 	}

+	tcan4x5x_get_dt_data(mcan_class);
+
 	tcan4x5x_check_wake(priv);

 	ret = tcan4x5x_write_tcan_reg(mcan_class, TCAN4X5X_INT_EN, 0);
diff --git a/drivers/net/can/m_can/tcan4x5x.h b/drivers/net/can/m_can/tcan4x5x.h
index e62c030d3e1e5a713c997e7c8ecad4a44aff4e6a..203399d5e8ccf3fd7a26b54d8356fca9d398524c 100644
--- a/drivers/net/can/m_can/tcan4x5x.h
+++ b/drivers/net/can/m_can/tcan4x5x.h
@@ -42,6 +42,8 @@ struct tcan4x5x_priv {

 	struct tcan4x5x_map_buf map_buf_rx;
 	struct tcan4x5x_map_buf map_buf_tx;
+
+	bool nwkrq_voltage_vio;
 };

 static inline void

-- 
2.46.2