| Message ID | 20230917152639.21443-1-alkuor@gmail.com |
|---|---|
| Headers | show |
| Series | Add TPS25750 USB type-C PD controller support | expand |
On Mon, Sep 18, 2023 at 04:57:49PM +0300, Heikki Krogerus wrote: > On Sun, Sep 17, 2023 at 11:26:24AM -0400, Abdel Alkuor wrote: > > 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. > > This looks mostly okay, but I'm a bit uncomfortable with flags like > is_tps25750. > > I think a better way would be to supply driver data. In it you would > have a callback for everything that needs to be customised. > > struct tipd_data { > int (*interrupt)(int irq, void *data); > ... > }; > ... > static const struct tipd_data tps25750_data = { > .interrupt = tps25750_interrupt, > ... > > Something like that. You can on top of that still check > device_is_compatible(dev, "...") in some places. > Sounds good. I will create callbacks factory struct as you suggested and remove the flag. > > thanks, > > -- > heikki Thanks, Abdel
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(-)