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Date: Mon, 15 Apr 2024 10:42:45 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Bhavya Kapoor <b-kapoor@...com>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <vigneshr@...com>
CC: <linux-arm-kernel@...ts.infradead.org>, <conor+dt@...nel.org>,
<krzk+dt@...nel.org>, <robh@...nel.org>, <kristo@...nel.org>,
<nm@...com>, <u-kumar1@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-j784s4-evm: Add support for multiple
CAN instances
Hello Bhavya,
On 4/12/2024 1:47 AM, Bhavya Kapoor wrote:
> CAN instances 0 and 1 in the mcu domain and 16 in the main domain are
> brought on the evm through headers J42, J43 and J46 respectively. Thus,
> add their respective transceiver's 0, 1 and 2 dt nodes to add support
> for these CAN instances.
Looking at schematic and board data sheet, it appears, board has 6 CAN
interfaces.
[J41--J46], but we are enabling only 4.
I understand, other interfaces might be used for other purpose.
Vignesh/Nishanth,
Do you think, this make sense to code all available interfaces on board and
mark as reserved, if used for other purpose , similar to what is done
for wkup_uart for this board.
> CAN instance 4 in the main domain is brought on the evm through header
> J45. The CAN High and Low lines from the SoC are routed through a mux
> on the evm. The select lines need to be set for the CAN signals to
> reach to its transceiver on the evm. Therefore, add transceiver 3
> dt node to add support for this CAN instance.
>
> Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
> ---
>
> rebased to next-20240411
>
> arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 107 +++++++++++++++++++++++
> 1 file changed, 107 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
> index 81fd7afac8c5..e56901973895 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
> @@ -272,6 +272,45 @@ dp0_connector_in: endpoint {
> };
> };
> };
> +
> + transceiver0: can-phy0 {
> + compatible = "ti,tcan1042";
> + #phy-cells = <0>;
> + max-bitrate = <5000000>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&mcu_mcan0_gpio_pins_default>;
> + standby-gpios = <&wkup_gpio0 69 GPIO_ACTIVE_HIGH>;
> + };
> +
> + transceiver1: can-phy1 {
> + compatible = "ti,tcan1042";
> + #phy-cells = <0>;
> + max-bitrate = <5000000>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&mcu_mcan1_gpio_pins_default>;
> + standby-gpios = <&wkup_gpio0 2 GPIO_ACTIVE_HIGH>;
> + };
> +
> + transceiver2: can-phy2 {
> + /* standby pin has been grounded by default */
> + compatible = "ti,tcan1042";
> + #phy-cells = <0>;
> + max-bitrate = <5000000>;
> + };
> +
> + transceiver3: can-phy3 {
> + compatible = "ti,tcan1042";
> + #phy-cells = <0>;
> + max-bitrate = <5000000>;
> + standby-gpios = <&exp2 7 GPIO_ACTIVE_HIGH>;
> + mux-states = <&mux1 1>;
> + };
> +
> + mux1: mux-controller {
> + compatible = "gpio-mux";
> + #mux-state-cells = <1>;
> + mux-gpios = <&exp2 14 GPIO_ACTIVE_HIGH>;
Could you help here on logic to choose pin 14
As I see for this mux
S0 is CANUART_MUX_SEL0 [Pin 14, which you want to control as high]
S1 is Pin 15 is "CANUART_MUX2_SEL1"
S2 is high
So in order to get CAN on mux output
All, S0, S1 and S2 should be high.
IMO, you should control both S0 and S1, or just S1 and S0 with dip switch
> + };
> };
>
> &wkup_gpio0 {
> @@ -336,6 +375,20 @@ J784S4_IOPAD(0x014, PIN_INPUT_PULLUP, 8) /* (AG33) MCAN14_TX.I2C4_SCL */
> J784S4_IOPAD(0x010, PIN_INPUT_PULLUP, 8) /* (AH33) MCAN13_RX.I2C4_SDA */
> >;
> };
> +
> + main_mcan4_pins_default: main-mcan4-default-pins {
> + pinctrl-single,pins = <
> + J784S4_IOPAD(0x088, PIN_INPUT, 0) /* (AF36) MCAN4_RX */
> + J784S4_IOPAD(0x084, PIN_OUTPUT, 0) /* (AG38) MCAN4_TX */
> + >;
> + };
> +
> + main_mcan16_pins_default: main-mcan16-default-pins {
> + pinctrl-single,pins = <
> + J784S4_IOPAD(0x028, PIN_INPUT, 0) /* (AE33) MCAN16_RX */
> + J784S4_IOPAD(0x024, PIN_OUTPUT, 0) /* (AH34) MCAN16_TX */
> + >;
> + };
> };
>
> &wkup_pmx2 {
> @@ -415,6 +468,32 @@ J784S4_WKUP_IOPAD(0x104, PIN_INPUT, 0) /* (U33) MCU_ADC1_AIN6 */
> J784S4_WKUP_IOPAD(0x108, PIN_INPUT, 0) /* (Y36) MCU_ADC1_AIN7 */
> >;
> };
> +
> + mcu_mcan0_pins_default: mcu-mcan0-default-pins {
> + pinctrl-single,pins = <
> + J784S4_WKUP_IOPAD(0x050, PIN_OUTPUT, 0) /* (K33) MCU_MCAN0_TX */
> + J784S4_WKUP_IOPAD(0x054, PIN_INPUT, 0) /* (F38) MCU_MCAN0_RX */
> + >;
> + };
> +
> + mcu_mcan1_pins_default: mcu-mcan1-default-pins {
> + pinctrl-single,pins = <
> + J784S4_WKUP_IOPAD(0x068, PIN_OUTPUT, 0) /* (H35) WKUP_GPIO0_4.MCU_MCAN1_TX */
> + J784S4_WKUP_IOPAD(0x06c, PIN_INPUT, 0) /* (K36) WKUP_GPIO0_5.MCU_MCAN1_RX */
> + >;
> + };
> +
> + mcu_mcan0_gpio_pins_default: mcu-mcan0-gpio-default-pins {
> + pinctrl-single,pins = <
> + J784S4_WKUP_IOPAD(0x040, PIN_INPUT, 7) /* (J38) MCU_SPI0_D1.WKUP_GPIO0_69 */
> + >;
> + };
> +
> + mcu_mcan1_gpio_pins_default: mcu-mcan1-gpio-default-pins {
> + pinctrl-single,pins = <
> + J784S4_WKUP_IOPAD(0x060, PIN_INPUT, 7) /* (J35) WKUP_GPIO0_2 */
> + >;
> + };
> };
>
> &wkup_pmx1 {
> @@ -1105,3 +1184,31 @@ dp0_out: endpoint {
> };
> };
> };
> +
> +&mcu_mcan0 {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&mcu_mcan0_pins_default>;
> + phys = <&transceiver0>;
> +};
> +
> +&mcu_mcan1 {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&mcu_mcan1_pins_default>;
> + phys = <&transceiver1>;
> +};
> +
> +&main_mcan16 {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&main_mcan16_pins_default>;
> + phys = <&transceiver2>;
> +};
> +
> +&main_mcan4 {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&main_mcan4_pins_default>;
> + phys = <&transceiver3>;
> +};
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