target/linux/realtek/patches-5.10/311-add-i2c-mux-rtl9300-support.patch

   1 From f4bdb7fdccdfe3fa382abe77f72a16c2f2e6add0 Mon Sep 17 00:00:00 2001
   2 From: Birger Koblitz <git@birger-koblitz.de>
   3 Date: Sat, 11 Dec 2021 20:25:37 +0100
   4 Subject: [PATCH] realtek: Add support for RTL9300/RTL9310 I2C multiplexing
   5
   6 The RTL9300/RTL9310 I2C controllers have support for 2 independent I2C
   7 masters, each with a fixed SCL pin, that cannot be changed. Each of these
   8 masters can use 8 (RTL9300) or 16 (RTL9310) different pins for SDA.
   9 This multiplexer directly controls the two masters and their shared
  10 IO configuration registers to allow multiplexing between any of these
  11 busses. The two masters cannot be used in parallel as the multiplex
  12 is protected by a standard multiplex lock.
  13
  14 Submitted-by: Birger Koblitz <git@birger-koblitz.de>
  15 ---
  16  drivers/i2c/muxes/Kconfig                     |  9 +++++++
  17  drivers/i2c/muxes/Makefile                    |  1 +
  18  2 files changed, 10 insertions(+)
  19
  20 --- a/drivers/i2c/muxes/Kconfig
  21 +++ b/drivers/i2c/muxes/Kconfig
  22 @@ -99,6 +99,15 @@ config I2C_MUX_REG
  23           This driver can also be built as a module.  If so, the module
  24           will be called i2c-mux-reg.
  25
  26 +config I2C_MUX_RTL9300
  27 +       tristate "RTL9300 based I2C multiplexer"
  28 +       help
  29 +         If you say yes to this option, support will be included for a
  30 +         RTL9300 based I2C multiplexer.
  31 +
  32 +         This driver can also be built as a module.  If so, the module
  33 +         will be called i2c-mux-reg.
  34 +
  35  config I2C_DEMUX_PINCTRL
  36         tristate "pinctrl-based I2C demultiplexer"
  37         depends on PINCTRL && OF
  38 --- a/drivers/i2c/muxes/Makefile
  39 +++ b/drivers/i2c/muxes/Makefile
  40 @@ -14,5 +14,6 @@ obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux
  41  obj-$(CONFIG_I2C_MUX_PCA954x)  += i2c-mux-pca954x.o
  42  obj-$(CONFIG_I2C_MUX_PINCTRL)  += i2c-mux-pinctrl.o
  43  obj-$(CONFIG_I2C_MUX_REG)      += i2c-mux-reg.o
  44 +obj-$(CONFIG_I2C_MUX_RTL9300)  += i2c-mux-rtl9300.o
  45
  46  ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG