2022-09-20 10:01:48 +00:00
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From f4bdb7fdccdfe3fa382abe77f72a16c2f2e6add0 Mon Sep 17 00:00:00 2001
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From: Birger Koblitz <git@birger-koblitz.de>
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Date: Sat, 11 Dec 2021 20:25:37 +0100
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Subject: [PATCH] realtek: Add support for RTL9300/RTL9310 I2C multiplexing
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The RTL9300/RTL9310 I2C controllers have support for 2 independent I2C
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masters, each with a fixed SCL pin, that cannot be changed. Each of these
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masters can use 8 (RTL9300) or 16 (RTL9310) different pins for SDA.
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This multiplexer directly controls the two masters and their shared
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IO configuration registers to allow multiplexing between any of these
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busses. The two masters cannot be used in parallel as the multiplex
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is protected by a standard multiplex lock.
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Submitted-by: Birger Koblitz <git@birger-koblitz.de>
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---
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drivers/i2c/muxes/Kconfig | 9 +++++++
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drivers/i2c/muxes/Makefile | 1 +
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2 files changed, 10 insertions(+)
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2021-12-11 19:25:37 +00:00
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--- a/drivers/i2c/muxes/Kconfig
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+++ b/drivers/i2c/muxes/Kconfig
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@@ -99,6 +99,15 @@ config I2C_MUX_REG
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This driver can also be built as a module. If so, the module
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will be called i2c-mux-reg.
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+config I2C_MUX_RTL9300
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+ tristate "RTL9300 based I2C multiplexer"
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+ help
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+ If you say yes to this option, support will be included for a
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+ RTL9300 based I2C multiplexer.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called i2c-mux-reg.
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+
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config I2C_DEMUX_PINCTRL
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tristate "pinctrl-based I2C demultiplexer"
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depends on PINCTRL && OF
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--- a/drivers/i2c/muxes/Makefile
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+++ b/drivers/i2c/muxes/Makefile
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@@ -14,5 +14,6 @@ obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux
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obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o
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obj-$(CONFIG_I2C_MUX_PINCTRL) += i2c-mux-pinctrl.o
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obj-$(CONFIG_I2C_MUX_REG) += i2c-mux-reg.o
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+obj-$(CONFIG_I2C_MUX_RTL9300) += i2c-mux-rtl9300.o
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ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
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