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From:   Abdel Alkuor <alkuor@gmail.com>
To:     heikki.krogerus@linux.intel.com, krzysztof.kozlowski+dt@linaro.org,
        bryan.odonoghue@linaro.org
Cc:     gregkh@linuxfoundation.org, robh+dt@kernel.org,
        linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        conor+dt@kernel.org, linux-kernel@vger.kernel.org,
        abdelalkuor@geotab.com
Subject: [PATCH v5 00/15] Add TPS25750 USB type-C PD controller support
Date:   Sun, 17 Sep 2023 11:26:24 -0400
Message-Id: <20230917152639.21443-1-alkuor@gmail.com>
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From: Abdel Alkuor <abdelalkuor@geotab.com>

TPS25750 USB type-C PD controller has the same register offsets as
tps6598x. The following is a summary of incorporating TPS25750 into
TPS6598x driver:

- Only Check VID register (0x00) for TPS6598x and cd321x, as TPS25750 doesn't
  have VID register.

- TypeC port registration will be registered differently for each PD
  controller. TPS6598x uses system configuration register (0x28) to get
  pr/dr capabilities. On the other hand, TPS25750 will use data role property
  and PD status register (0x40) to get pr/dr capabilities as TPS25750 doesn't
  have register 0x28 supported.

- TPS25750 requires writing a binary configuration to switch PD
  controller from PTCH mode to APP mode which needs the following changes:
  - Add PTCH mode to the modes list.
  - Add an argument to tps6598x_check_mode to return the current mode.
  - Currently, tps6598x_exec_cmd has cmd timeout hardcoded to 1 second,
    and doesn't wait before checking DATA_OUT response. In TPS25750, patch 4CCs
    take longer than 1 second to execute and some requires a delay before
    checking DATA_OUT. To accommodate that, cmd_timeout and response_delay will
    be added as arguments to tps6598x_exec_cmd.
  - Implement applying patch sequence for TPS25750.

- In pm suspend callback, patch mode needs to be checked and the binary
  configuration should be applied if needed.

- For interrupt, TPS25750 has only one event register (0x14) and one mask
  register (0x16) of 11 bytes each, where TPS6598x has two event
  and two mask registers of 8 bytes each. Both TPS25750 and TPS65986x
  shares the same bit field offsets for events/masks/clear but many of
  there fields are reserved in TPS25750, the following needs to be done in
  tps6598x_interrupt:
  - Read EVENT1 register as a block of 11 bytes when tps25750 is present
  - Write CLEAR1 register as a block of 11 bytes when tps25750 is present
  - Add trace_tps25750_irq
  - During testing, I noticed that when a cable is plugged into the PD
    controller and before PD controller switches to APP mode, there is a
    lag between dr/pr updates and PlugInsertOrRemoval Event, so a check
    for dr/pr change needs to be added along TPS_REG_INT_PLUG_EVENT check

- Add TPS25750 traces for status and power status registers. Trace for
  data register won't be added as it doesn't exist in the device.

- Configure sleep mode for TPS25750.

v5:
 - PATCH 1: Add tps25750 bindings to tps6598x
 - PATCH 2: Remove tps25750 driver and incorperate tps25750
 	    into tps6598x driver
v4:
 - PATCH 1: No change
 - PATCH 2: Fix comments style and drop of_match_ptr
v3:
 - PATCH 1: Fix node name
 - PATCH 2: Upload tps25750 driver patch
v2:
 - PATCH 1: General properties clean up

Abdel Alkuor (15):
  dt-bindings: usb: tps6598x: Add tps25750
  USB: typec: Add cmd timeout and response delay
  USB: typec: Add patch mode to tps6598x
  USB: typec: Load TPS25750 patch bundle
  USB: typec: Check for EEPROM present
  USB: typec: Clear dead battery flag
  USB: typec: Apply patch again after power resume
  USB: typec: Add interrupt support for TPS25750
  USB: typec: Refactor tps6598x port registration
  USB: typec: Add port registration for tps25750
  USB: typec: Enable sleep mode for tps25750
  USB: typec: Add trace for tps25750 irq
  USB: typec: Add power status trace for tps25750
  USB: typec: Add status trace for tps25750
  USB: typec: Do not check VID for tps25750

 .../devicetree/bindings/usb/ti,tps6598x.yaml  |  70 +++
 drivers/usb/typec/tipd/core.c                 | 570 +++++++++++++++---
 drivers/usb/typec/tipd/tps6598x.h             |  36 ++
 drivers/usb/typec/tipd/trace.h                |  84 +++
 4 files changed, 683 insertions(+), 77 deletions(-)

-- 
2.34.1