git.ipfire.org Git - thirdparty/openwrt.git/blob

   1 From 9c9330a7ad5dab82517a3f712099f54a4a1a6f3e Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Thu, 14 Mar 2024 15:25:19 +0000
   4 Subject: [PATCH 0963/1085] dtoverlays: Add a disconnect_on_idle override to
   5  i2c-mux
   6
   7 When running multiple muxes, in order to be able to reuse the
   8 same address on child buses of different muxes you have to
   9 disconnect the mux after every transaction.
  10
  11 Add an override to select that option.
  12
  13 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  14 ---
  15  arch/arm/boot/dts/overlays/README              | 3 +++
  16  arch/arm/boot/dts/overlays/i2c-mux-overlay.dts | 6 ++++++
  17  2 files changed, 9 insertions(+)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -2042,6 +2042,9 @@ Params: pca9542                 Select t
  22          i2c6                    Choose the I2C6 bus (configure with the i2c6
  23                                  overlay - BCM2711 only)
  24
  25 +        disconnect_on_idle      Force the mux to disconnect all child buses
  26 +                                after every transaction.
  27 +
  28
  29  [ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
  30
  31 --- a/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
  32 +++ b/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
  33 @@ -3,6 +3,8 @@
  34  /dts-v1/;
  35  /plugin/;
  36
  37 +#include <dt-bindings/mux/mux.h>
  38 +
  39  /{
  40         compatible = "brcm,bcm2835";
  41
  42 @@ -169,5 +171,9 @@
  43                        <&frag100>, "target-path=i2c5";
  44                 i2c6 = <&frag100>, "target?=0",
  45                        <&frag100>, "target-path=i2c6";
  46 +               disconnect_on_idle =
  47 +                       <&pca9542>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,
  48 +                       <&pca9545>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,
  49 +                       <&pca9548>,"idle-state:0=", <MUX_IDLE_DISCONNECT>;
  50         };
  51  };