Commit cd9de06e authored by Erwan Le Ray's avatar Erwan Le Ray Committed by Greg Kroah-Hartman
Browse files

dt-bindings: serial: stm32: override FIFO threshold properties 



Override rx-threshold and tx-threshold properties:
- extend description
- provide default and expected values

Signed-off-by: default avatarFabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: default avatarErwan Le Ray <erwan.leray@foss.st.com>

Changes in v2:
Change added properties naming and factorize it in serial.yaml as proposed
by Rob Herring.

Reviewed-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210413174015.23011-3-erwan.leray@foss.st.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8574c9e7

Documentation/devicetree/bindings/serial/st,stm32-uart.yaml

+26 −1
Original line number Diff line number Diff line
@@ -65,6 +65,18 @@ properties: 
  linux,rs485-enabled-at-boot-time: true

  rs485-rx-during-tx: true



  rx-threshold:

    description:

      If value is set to 1, RX FIFO threshold is disabled.

    enum: [1, 2, 4, 8, 12, 14, 16]

    default: 8



  tx-threshold:

    description:

      If value is set to 1, TX FIFO threshold is disabled.

    enum: [1, 2, 4, 8, 12, 14, 16]

    default: 8



allOf:

  - $ref: rs485.yaml#

  - $ref: serial.yaml#
@@ -82,6 +94,17 @@ allOf: 
    then:

      properties:

        rx-tx-swap: false

  - if:

      properties:

        compatible:

          contains:

            enum:

              - st,stm32-uart

              - st,stm32f7-uart

    then:

      properties:

        rx-threshold: false

        tx-threshold: false



required:

  - compatible
@@ -96,13 +119,15 @@ examples: 
  - |

    #include <dt-bindings/clock/stm32mp1-clks.h>

    usart1: serial@40011000 {

      compatible = "st,stm32-uart";

      compatible = "st,stm32h7-uart";

      reg = <0x40011000 0x400>;

      interrupts = <37>;

      clocks = <&rcc 0 164>;

      dmas = <&dma2 2 4 0x414 0x0>,

             <&dma2 7 4 0x414 0x0>;

      dma-names = "rx", "tx";

      rx-threshold = <4>;

      tx-threshold = <4>;

      rs485-rts-active-low;

    };