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Integrate linux-guf/santino-can-rs485-fix

Commit: seco-ne/kernel/linux-guf@ee94ea87

arm:dts:santaro,santoka: update rs485 regulator

Instead of using always-on regulator, configure it as supply for the port, so it gets enabled when the port is opened.

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Commit: seco-ne/kernel/linux-guf@1051e028

arm:dts:santino: Fix CAN-RS485 power regulator

Add the fixed regulator for the CAN/RS485 output of SANTINO, that may be optionally galvanic isolated.

Add rts-gpios for RS485.

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Commit: seco-ne/kernel/linux-guf@45f22842

arm:dts:imx6qdl-san: Add CAN pinctrl for Santino

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Commit: seco-ne/kernel/linux-guf@e003c824

tty:serial:imx: Add support for a rs485-supply

On some hw the rs485 needs an additional regulator to be switched on. With this patch it is possible to configure the regulator as supply for the port, so it gets enabled when the port is opened.

BCS 746-001117

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