usb: typec: ucsi: stm32g0: add support for stm32g0 controller

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STM32G0 provides an integrated USB Type-C and power delivery interface.
It can be programmed with a firmware to handle UCSI protocol over I2C
interface. A GPIO is used as an interrupt line.

Type-C connector can be used as a wakeup source (typically to detect
changes on the port, like attach or detach). PM suspend / resume routines
are used to enable wake irqs, and signal a wakeup event in case the IRQ
has fired while in suspend. The i2c core is doing the necessary
initialization when the "wakeup-source" flag is provided.
Note: the interrupt handler shouldn't be called before the i2c bus resumes.
So, the interrupts are disabled during suspend period, and re-enabled
upon resume, to avoid i2c transfer while suspended, from the irq handler.

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220713120842.560902-3-fabrice.gasnier@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Fabrice Gasnier 2022-07-13 14:08:41 +02:00 • committed by Greg Kroah-Hartman

parent b60fd9361b

commit 72849d4fce

3 changed files with 275 additions and 0 deletions

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10

drivers/usb/typec/ucsi/Kconfig

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1

drivers/usb/typec/ucsi/Makefile

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264

drivers/usb/typec/ucsi/ucsi_stm32g0.c

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