Messages in this thread | | | Date | Mon, 7 Feb 2022 13:20:24 +0200 | From | Andy Shevchenko <> | Subject | Re: [PATCH 1/2] i2c: hisi: Add generic GPIO bus recovery support |
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On Mon, Feb 07, 2022 at 01:17:49PM +0200, Andy Shevchenko wrote: > On Tue, Jan 25, 2022 at 08:49:29PM +0800, Yicong Yang wrote: > > Add generic GPIO bus recovery support for i2c-hisi driver > > by registering the recovery information with core provided > > i2c_generic_scl_recovery() method. > > > > As the SCL/SDA pins are multiplexed with GPIO, we need to > > switch the pins mux to GPIO before recovery and switch back > > after recovery. It's implemented by the ACPI method in > > the i2c_bus_recovery_info->{prepare,unprepare}_recovery() > > method. > > NAK. > > ACPI has its own resources for that. What is missed is the layer between ACPI > and pin control.
To be more precise,
https://uefi.org/specs/ACPI/6.4/19_ASL_Reference/ACPI_Source_Language_Reference.html?highlight=pinfunction#pinconfig-pin-configuration-descriptor-macro
https://uefi.org/specs/ACPI/6.4/19_ASL_Reference/ACPI_Source_Language_Reference.html?highlight=pinfunction#pinfunction-pin-function-descriptor-macro
https://uefi.org/specs/ACPI/6.4/19_ASL_Reference/ACPI_Source_Language_Reference.html?highlight=pinfunction#pingroup-pin-group-descriptor-macro
https://uefi.org/specs/ACPI/6.4/19_ASL_Reference/ACPI_Source_Language_Reference.html?highlight=pinfunction#pingroupconfig-pin-group-configuration-descriptor-macro
-- With Best Regards, Andy Shevchenko
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