linux-kernel - [PATCH v3 6/8] can: mcp251xfd: only configure PIN1 when rx

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Message-Id: <20240521-mcp251xfd-gpio-feature-v3-6-7f829fefefc2@ew.tq-group.com>
Date: Tue, 21 May 2024 15:04:56 +0200
From: Gregor Herburger <gregor.herburger@...tq-group.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>, 
 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>
Cc: linux-can@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux@...tq-group.com, gregor.herburger@...tq-group.com
Subject: [PATCH v3 6/8] can: mcp251xfd: only configure PIN1 when rx_int is
 set

When rx_int is used th mcp251xfd_chip_rx_int_enable and
mcp251xfd_chip_rx_int_disable function configure both PIN0 and PIN1. To
prepare the support of the GPIOS only configure PIN1 with
regmap_update_bits.

This way PIN0 can be used as GPIO while PIN1 is used as rx_int
interrupt.

Signed-off-by: Gregor Herburger <gregor.herburger@...tq-group.com>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 22 ++++++++--------------
 drivers/net/can/spi/mcp251xfd/mcp251xfd.h      |  6 ++++++
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 4739ad80ef2a..d8d936576c94 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -586,23 +586,21 @@ static int mcp251xfd_set_bittiming(const struct mcp251xfd_priv *priv)
 
 static int mcp251xfd_chip_rx_int_enable(const struct mcp251xfd_priv *priv)
 {
-	u32 val;
+	u32 val, mask;
 
 	if (!priv->rx_int)
 		return 0;
 
-	/* Configure GPIOs:
-	 * - PIN0: GPIO Input
-	 * - PIN1: GPIO Input/RX Interrupt
+	/* Configure PIN1 as RX Interrupt:
 	 *
 	 * PIN1 must be Input, otherwise there is a glitch on the
 	 * rx-INT line. It happens between setting the PIN as output
 	 * (in the first byte of the SPI transfer) and configuring the
 	 * PIN as interrupt (in the last byte of the SPI transfer).
 	 */
-	val = MCP251XFD_REG_IOCON_PM0 | MCP251XFD_REG_IOCON_TRIS1 |
-		MCP251XFD_REG_IOCON_TRIS0;
-	return regmap_write(priv->map_reg, MCP251XFD_REG_IOCON, val);
+	val = MCP251XFD_REG_IOCON_TRIS(1);
+	mask = MCP251XFD_REG_IOCON_TRIS(1) | MCP251XFD_REG_IOCON_PM(1);
+	return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON, mask, val);
 }
 
 static int mcp251xfd_chip_rx_int_disable(const struct mcp251xfd_priv *priv)
@@ -612,13 +610,9 @@ static int mcp251xfd_chip_rx_int_disable(const struct mcp251xfd_priv *priv)
 	if (!priv->rx_int)
 		return 0;
 
-	/* Configure GPIOs:
-	 * - PIN0: GPIO Input
-	 * - PIN1: GPIO Input
-	 */
-	val = MCP251XFD_REG_IOCON_PM1 | MCP251XFD_REG_IOCON_PM0 |
-		MCP251XFD_REG_IOCON_TRIS1 | MCP251XFD_REG_IOCON_TRIS0;
-	return regmap_write(priv->map_reg, MCP251XFD_REG_IOCON, val);
+	/* Configure PIN1 as GPIO Input */
+	val = MCP251XFD_REG_IOCON_PM(1) | MCP251XFD_REG_IOCON_TRIS(1);
+	return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON, val, val);
 }
 
 static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv *priv)
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
index 75d5a8a25415..78637223dbc8 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
@@ -335,13 +335,19 @@
 #define MCP251XFD_REG_IOCON_TXCANOD BIT(28)
 #define MCP251XFD_REG_IOCON_PM1 BIT(25)
 #define MCP251XFD_REG_IOCON_PM0 BIT(24)
+#define MCP251XFD_REG_IOCON_PM(n) (MCP251XFD_REG_IOCON_PM0 << (n))
 #define MCP251XFD_REG_IOCON_GPIO1 BIT(17)
 #define MCP251XFD_REG_IOCON_GPIO0 BIT(16)
+#define MCP251XFD_REG_IOCON_GPIO(n) (MCP251XFD_REG_IOCON_GPIO0 << (n))
+#define MCP251XFD_REG_IOCON_GPIO_MASK GENMASK(17, 16)
 #define MCP251XFD_REG_IOCON_LAT1 BIT(9)
 #define MCP251XFD_REG_IOCON_LAT0 BIT(8)
+#define MCP251XFD_REG_IOCON_LAT(n) (MCP251XFD_REG_IOCON_LAT0 << (n))
+#define MCP251XFD_REG_IOCON_LAT_MASK GENMASK(9, 8)
 #define MCP251XFD_REG_IOCON_XSTBYEN BIT(6)
 #define MCP251XFD_REG_IOCON_TRIS1 BIT(1)
 #define MCP251XFD_REG_IOCON_TRIS0 BIT(0)
+#define MCP251XFD_REG_IOCON_TRIS(n) (MCP251XFD_REG_IOCON_TRIS0 << (n))
 
 #define MCP251XFD_REG_CRC 0xe08
 #define MCP251XFD_REG_CRC_FERRIE BIT(25)

-- 
2.34.1