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a14bf463e7
core: add of based component probing Some devices are designed and manufactured with some components having multiple drop-in replacement options. These components are often connected to the mainboard via ribbon cables, having the same signals and pin assignments across all options. These may include the display panel and touchscreen on laptops and tablets, and the trackpad on laptops. Sometimes which component option is used in a particular device can be detected by some firmware provided identifier, other times that information is not available, and the kernel has to try to probe each device. Instead of a delicate dance between drivers and device tree quirks, this change introduces a simple I2C component probe function. For a given class of devices on the same I2C bus, it will go through all of them, doing a simple I2C read transfer and see which one of them responds. It will then enable the device that responds. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmdMOCwACgkQFA3kzBSg KbaLWQ//e+29c9Trh+Typ6YCknuCFmM12xNUEPgce93EldERZjfCsdlHEchJnjEe RX5Mw+UxT7NqFUD6G2YQQw35LMj/PDws4Q/q3OwAvurj2PqoKEGIbdTxUEbGrLtT aYRUjGoqjPk3gAkqfKEQp8X8bvqKJfQ/xeXcZyy7Ij8xPU1LC/W6So4vpZA7oZkZ UfwrUXu2NM/DKfLATeSH3vnlBrrpco9BdjImDanP8BpuYHQ0aNt7IToDytd3/rLZ WKQPbHqVzzBUHm8Tf+DTyeVtII/ID078z+RW7htPrzPtzhVu2DN56w3z7/+EsVIy XKb1PiJo5HlFev4gxhIcUgf8L5JYE8MyU8eeRWAcDObiBYVcSP34P7Xoykczjuq9 22IFNSdaqMVdigo9v4p7U99fVjoi3oUqIVsSb2HkmND8bPw3+jtyq1GxTFvTeOw8 EVJGuGjYrPiko26zNgK/WZaumpB+fsH7uRioSb1ejlSQk0BcNv4YqjYaMx9aT7Xj +zF7luuxpkWTkPCjk57GX55K/BFzkA9jhJdKqjImBS+Q9Rn3k5bHyRdNPUDIeWs0 Yl5dhg6QbLHyuPC2R/hJiV6X4uFloH9+Oh99T3lLzcVNc2mllPQDN9F4I8q5nWB8 Eq5U95fnegfdVkiWnbNCnTCux/mypm35Gx46BffTiAJL2U9pSIE= =MAxU -----END PGP SIGNATURE----- Merge tag 'i2c-for-6.13-rc1-part3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c component probing support from Wolfram Sang: "Add OF component probing. Some devices are designed and manufactured with some components having multiple drop-in replacement options. These components are often connected to the mainboard via ribbon cables, having the same signals and pin assignments across all options. These may include the display panel and touchscreen on laptops and tablets, and the trackpad on laptops. Sometimes which component option is used in a particular device can be detected by some firmware provided identifier, other times that information is not available, and the kernel has to try to probe each device. Instead of a delicate dance between drivers and device tree quirks, this change introduces a simple I2C component probe function. For a given class of devices on the same I2C bus, it will go through all of them, doing a simple I2C read transfer and see which one of them responds. It will then enable the device that responds" * tag 'i2c-for-6.13-rc1-part3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: MAINTAINERS: fix typo in I2C OF COMPONENT PROBER of: base: Document prefix argument for of_get_next_child_with_prefix() i2c: Fix whitespace style issue arm64: dts: mediatek: mt8173-elm-hana: Mark touchscreens and trackpads as fail platform/chrome: Introduce device tree hardware prober i2c: of-prober: Add GPIO support to simple helpers i2c: of-prober: Add simple helpers for regulator support i2c: Introduce OF component probe function of: base: Add for_each_child_of_node_with_prefix() of: dynamic: Add of_changeset_update_prop_string |
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