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charset="utf-8" Add the boolean property 'microchip,xstbyen' to enable the dedicated transceiver standby control function on the INT0/GPIO0/XSTBY pin of the MCP251xFD family. Signed-off-by: Viken Dadhaniya Acked-by: Conor Dooley --- v2 -> v3: - No change. v2 Link: https://lore.kernel.org/all/20260316131950.859748-2-viken.dadhaniy= a@oss.qualcomm.com/ v1 -> v2: - Drop the gpio-hog approach as suggested by Dmitry. - Add the microchip,xstbyen property to enable transceiver standby control. v1 Link: https://lore.kernel.org/all/20260108125200.2803112-2-viken.dadhani= ya@oss.qualcomm.com/ --- .../devicetree/bindings/net/can/microchip,mcp251xfd.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.= yaml b/Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.yaml index 2d13638ebc6a..28e494262cd9 100644 --- a/Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.yaml +++ b/Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.yaml @@ -44,6 +44,14 @@ properties: signals a pending RX interrupt. maxItems: 1 =20 + microchip,xstbyen: + type: boolean + description: + If present, configure the INT0/GPIO0/XSTBY pin as transceiver standby + control. 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charset="utf-8" The MCP251xFD has a dedicated transceiver standby control function on the INT0/GPIO0/XSTBY pin, controlled by the XSTBYEN bit in IOCON. When enabled, the hardware automatically manages the transceiver standby state: the pin is driven low when the controller is active and high when it enters Sleep mode. Enable this feature when the 'microchip,xstbyen' device tree property is present. Signed-off-by: Viken Dadhaniya --- v2 -> v3: - Configure xstbyen pin before bringing the controller into normal mode. - Add a check in mcp251xfd_gpio_request() to ensure that GPIO0 cannot be used when xstbyen is enabled. v2 Link: https://lore.kernel.org/all/20260316131950.859748-3-viken.dadhaniy= a@oss.qualcomm.com/ --- .../net/can/spi/mcp251xfd/mcp251xfd-core.c | 37 +++++++++++++++++++ drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 1 + 2 files changed, 38 insertions(+) diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/c= an/spi/mcp251xfd/mcp251xfd-core.c index 9c86df08c2c5..92a86083c896 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c @@ -764,6 +764,31 @@ static void mcp251xfd_chip_stop(struct mcp251xfd_priv = *priv, mcp251xfd_chip_set_mode(priv, MCP251XFD_REG_CON_MODE_CONFIG); } =20 +static int mcp251xfd_chip_xstbyen_enable(const struct mcp251xfd_priv *priv) +{ + /* Configure the INT0/GPIO0/XSTBY pin as transceiver standby control: + * + * - XSTBYEN=3D1: route the pin to the transceiver standby function + * - TRIS0=3D0: set output direction; the reset default is 1 (input), + * which leaves the pin floating HIGH and keeps the + * transceiver in standby regardless of XSTBYEN + * - LAT0=3D0: drive pin LOW =3D> transceiver active (not in standby) + * + * All three bits are included in the mask; only XSTBYEN is set in + * val, so TRIS0 and LAT0 are cleared to 0 atomically. + * + * Pin behaviour by mode: + * - Config mode: controlled by LAT0 (LAT0=3D0 =3D> LOW =3D> active) + * - Normal mode: hardware drives pin LOW (active) + * - Sleep mode: hardware drives pin HIGH (standby) + */ + return regmap_update_bits(priv->map_reg, MCP251XFD_REG_IOCON, + MCP251XFD_REG_IOCON_XSTBYEN | + MCP251XFD_REG_IOCON_TRIS0 | + MCP251XFD_REG_IOCON_LAT0, + MCP251XFD_REG_IOCON_XSTBYEN); +} + static int mcp251xfd_chip_start(struct mcp251xfd_priv *priv) { int err; @@ -796,6 +821,12 @@ static int mcp251xfd_chip_start(struct mcp251xfd_priv = *priv) =20 priv->can.state =3D CAN_STATE_ERROR_ACTIVE; =20 + if (priv->xstbyen) { + err =3D mcp251xfd_chip_xstbyen_enable(priv); + if (err) + goto out_chip_stop; + } + err =3D mcp251xfd_chip_set_normal_mode(priv); if (err) goto out_chip_stop; @@ -1805,6 +1836,11 @@ static int mcp251xfd_gpio_request(struct gpio_chip *= chip, unsigned int offset) u32 pin_mask =3D MCP251XFD_REG_IOCON_PM(offset); int ret; =20 + if (priv->xstbyen && offset =3D=3D 0) { + netdev_err(priv->ndev, "Can't use GPIO 0 with XSTBYEN!\n"); + return -EINVAL; + } + if (priv->rx_int && offset =3D=3D 1) { netdev_err(priv->ndev, "Can't use GPIO 1 with RX-INT!\n"); return -EINVAL; @@ -2271,6 +2307,7 @@ static int mcp251xfd_probe(struct spi_device *spi) priv->pll_enable =3D pll_enable; priv->reg_vdd =3D reg_vdd; priv->reg_xceiver =3D reg_xceiver; + priv->xstbyen =3D device_property_present(&spi->dev, "microchip,xstbyen"); priv->devtype_data =3D *(struct mcp251xfd_devtype_data *)spi_get_device_m= atch_data(spi); =20 /* Errata Reference: diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/sp= i/mcp251xfd/mcp251xfd.h index 085d7101e595..d3f4704e2678 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h @@ -672,6 +672,7 @@ struct mcp251xfd_priv { struct gpio_desc *rx_int; struct clk *clk; bool pll_enable; + bool xstbyen; struct regulator *reg_vdd; struct regulator *reg_xceiver; =20 --=20 2.34.1