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The devices on the mux can be selected by writing the appropriate device number to an I2C config register (0xff) that is not used by amc6821 logic. This required us to add a new compatible to the amc6821 driver, from which, the new platform device "tsd,mule-i2c-mux" is probed. The selected device on the mux can be accessed for reading and writing at I2C address 0x6f. +--------+----------------+------------------------------+ | Mule | 0x18 | +------------------+ | --------+----->| amc6821 | | | | +------------------+ | | +----->| tsd,mule-i2c-mux |---+ | | +------------------+ | | | V__ +---------+ | | | \-------->| isl1208 | | | | | +---------+ | 0x6f | | M |-------->| dev #1 | | ------------------------------------>| U | +---------+ | | | X |-------->| dev #2 | | | | | +---------+ | | | /-------->| dev #3 | | | |__/ +---------+ | +--------------------------------------------------------+ This patch-series adds support for the tsd,mule-i2c multiplexer as part of rk3399-puma, px30-ringneck, rk3588-tiger and rk3588-jaguar boards. Please merge patch 1 before patch 3 Please merge patches 2, 3 and 4 (and 1) before patches 5, 6, 7, 8 Signed-off-by: Farouk Bouabid Changes in v7: - Merged __mux_select and mux_select functions in patch 2 - Removed unnecessary prints after mux_alloc and add_adapter calls in patch 2 - Added Guenter's Reviewed-by tag - Added Rob's Reviewed-by tag - Added Wolfram's Reviewed/Acked-by tags - Link to v6: https://lore.kernel.org/r/20240725-dev-mule-i2c-mux-v6-0-f9f6d7b60fb2@cherry.de Changes in v6: - Move ti,amc6821 from trivial-devices into its own dt-bindings - Use same regmap config structure for both tsd,mule and ti,amc6821 - Remove max_register from regmap config structure for amc6821 - Link to v5: https://lore.kernel.org/r/20240708-dev-mule-i2c-mux-v5-0-71446d3f0b8d@cherry.de Changes in v5: - Drop the mfd implementation of v4 - Add more dev_probe_err callbacks to tsd,mule-i2c-mux - Instantiate tsd,mule-i2c-mux as a platform device from amc6821 driver - add "Theobroma Systems" when describing mule. - Link to v4: https://lore.kernel.org/lkml/20240618-dev-mule-i2c-mux-v4-0-5462d28354c8@cherry.de/ Changes in v4: - Drop the previously added i2c adapter quirks - Add platform driver probe to amc6821. - Change mule-i2c-mux driver to a platform driver - Add dev_probe_err in mule-i2c-mux driver - Add support for tsd,mule in simple-mfd-i2c - Add tsd,mule mfd to supported dts - Link to v3: https://lore.kernel.org/r/20240611-dev-mule-i2c-mux-v3-0-08d26a28e001@cherry.de Changes in v3: - Change "i2c" in comments/commit-logs to "I2C" - Fix long line-length - Warn when "share_addr_with_children" is set and the Mux is not an I2C device - Fix/stop propagating "I2C_AQ_SKIP_ADDR_CHECK" flag if "share_addr_with_children" is not set. - Fix "old_fw" variable is used to indicate the reversed meaning. - Link to v2: https://lore.kernel.org/r/20240506-dev-mule-i2c-mux-v2-0-a91c954f65d7@cherry.de Changes in v2: - Add i2c-adapter quirks to skip checking for conflict between the mux core and a child device address. - Rename dt-binding to "tsd,mule-i2c-mux.yaml" - Add Mule description to kconfig - Fix indentation - Move device table after probe - Link to v1: https://lore.kernel.org/r/20240426-dev-mule-i2c-mux-v1-0-045a482f6ffb@theobroma-systems.com --- Farouk Bouabid (8): dt-bindings: i2c: add support for tsd,mule-i2c-mux i2c: muxes: add support for tsd,mule-i2c multiplexer dt-bindings: hwmon: add support for ti,amc6821 hwmon: (amc6821) add support for tsd,mule arm64: dts: rockchip: add tsd,mule-i2c-mux on rk3588-jaguar arm64: dts: rockchip: add tsd,mule-i2c-mux on rk3399-puma arm64: dts: rockchip: add tsd,mule-i2c-mux on rk3588-tiger arm64: dts: rockchip: add tsd,mule-i2c-mux on px30-ringneck .../devicetree/bindings/hwmon/ti,amc6821.yaml | 86 ++++++++++++ .../devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml | 69 ++++++++++ .../devicetree/bindings/trivial-devices.yaml | 2 - arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi | 24 +++- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 24 +++- arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts | 25 +++- arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi | 23 +++- drivers/hwmon/amc6821.c | 12 +- drivers/i2c/muxes/Kconfig | 16 +++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-mule.c | 148 +++++++++++++++++++++ 11 files changed, 404 insertions(+), 26 deletions(-) --- base-commit: 67784a74e258a467225f0e68335df77acd67b7ab change-id: 20240404-dev-mule-i2c-mux-9103cde07021 Best regards,