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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 --- 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 --- .../net/can/spi/mcp251xfd/mcp251xfd-core.c | 30 +++++++++++++++++++ drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/c= an/spi/mcp251xfd/mcp251xfd-core.c index 9c86df08c2c5..7a152acf4931 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c @@ -764,6 +764,29 @@ 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. + * + * Once configured, the hardware automatically drives the pin HIGH + * on Sleep mode entry and LOW on Sleep mode exit. + */ + 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; @@ -800,6 +823,12 @@ static int mcp251xfd_chip_start(struct mcp251xfd_priv = *priv) if (err) goto out_chip_stop; =20 + if (priv->xstbyen) { + err =3D mcp251xfd_chip_xstbyen_enable(priv); + if (err) + goto out_chip_stop; + } + return 0; =20 out_chip_stop: @@ -2271,6 +2300,7 @@ 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); 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The controller is connected via SPI3 and uses a 40=E2=80=AFMHz oscillator. The setup was tested with CAN-FD loopback and actual data transfer using an external PCAN-USB FD adapter. Signed-off-by: Viken Dadhaniya Reviewed-by: Konrad Dybcio --- v1 -> v2: - Drop the gpio-hog property. - Add the microchip,xstbyen property to enable transceiver standby control. v1 Link: https://lore.kernel.org/all/20260108125200.2803112-3-viken.dadhani= ya@oss.qualcomm.com/ --- --- arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 22 ++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot= /dts/qcom/qcs6490-rb3gen2.dts index e3d2f01881ae..245961722f84 100644 --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts @@ -44,6 +44,14 @@ chosen { stdout-path =3D "serial0:115200n8"; }; =20 + clocks { + mcp2518fd_osc: can-clk { + compatible =3D "fixed-clock"; + clock-frequency =3D <40000000>; + #clock-cells =3D <0>; + }; + }; + dp-connector { compatible =3D "dp-connector"; label =3D "DP"; @@ -1151,6 +1159,20 @@ platform { }; }; =20 +&spi3 { + status =3D "okay"; + + can@0 { + compatible =3D "microchip,mcp2518fd"; + reg =3D <0>; + interrupts-extended =3D <&tlmm 7 IRQ_TYPE_LEVEL_LOW>; + clocks =3D <&mcp2518fd_osc>; + spi-max-frequency =3D <10000000>; + vdd-supply =3D <&vreg_l11c_2p8>; + microchip,xstbyen; + }; +}; + &swr2 { status =3D "okay"; =20 --=20 2.34.1