[PATCH v7 0/9] Add Renesas RZ/G3E GPT support

From: Biju Das <[email protected]>

This series extends the RZ/G2L GPT PWM driver with RZ/G3E SoC support.

The RZ/G3E GPT has a number of hardware differences compared to RZ/G2L:
it exposes 16 channels (across two GPT instances of 8 channels each),
uses a 4-bit GTCR prescaler field (versus 3-bit on RZ/G2L), and has a
discontinuous prescale sequence with powers-of-2 scaling rather than the
continuous powers-of-4 sequence on RZ/G2L. It also has additional clocks
and resets (bus clock and rst_s).

v6->v7:
 * Reordered the patched moving POEG support to last.
 * Replaced USEC_PER_SEC->NSEC_PER_MSEC for period/duty cycle
   conversion.
 * Avoided recalculation of prescale, if is_small_second_period == true.
 * Moved `wfhw->gtccr = 0` into the if block in rzg2l_gpt_config().
 * Added rzg2l_gpt_poeg_link_channels() and used __free for deallocating
   device node pointer.
 * Replaced dev_err()->dev_err_probe() in rzg2l_gpt_poeg_link_channels().
 * Replaced local variable cells with num_poeg_pairs in
   rzg2l_gpt_poeg_init().
v5->v6:
 * Added patch for fixing period_ticks overflow.
 * Added patch to add missing newlines to dev_err_probe() messages.
 * Dropped extra space in poegs variable assignment in
   rzg2l_gpt_poeg_init().
 * Updated the comment sections of rzg2l_gpt_poeg_init() with POEG and GPT
   in upper-case and replaced configure->configures.
 * Format specifiers in dev_err() changed from %d to %u in
   rzg2l_gpt_poeg_init().
 * Dropped local variables pv and dc from rzg2l_gpt_round_waveform_tohw().
 * Dropped blank line in rzg2l_gpt_round_waveform_tohw().
 * Moved assignment of rzg2l_gpt->period_ticks[ch] to *_write_waveform().
 * Restored clamping of duty_ticks with period_ticks in
   rzg2l_gpt_round_waveform_tohw().
 * Simplified rzg2l_gpt_write_waveform() using else if statement.
 * Dropped local variable gptr in rzg2l_gpt_write_waveform().
 * Moved mutex after early return in rzg2l_gpt_round_waveform_tohw().
 * Dropped extra parameter rzg2l_gpt from rzg2l_gpt_calculate_prescale()
   in rzg2l_gpt_round_waveform_tohw().
 * Updated comment in rzg2l_gpt_calculate_period_or_duty().
 * Updated rzg3e_gpt_calculate_prescale().
v4->v5:
 * Merged GPT linking POEG patch series here.
 * Dropped suspend/resume patch; will be added later.
 * Updated commit description for patches #2, #4, #5, and #6.
 * Replaced return type of rzg2l_gpt_poeg_init() from void to int and
   probe() check this return value.
 * Added more error checks in rzg2l_gpt_poeg_init().
 * Added a patch to drop the unused rzg2l_gpt_chip parameter from
   rzg2l_gpt_calculate_prescale().
 * Updated rzg2l_gpt_round_waveform_tohw() to initialize gtccr when the
   period of the second channel is smaller.
 * Replaced period_ticks with RZG2L_MAX_TICKS for the duty_ticks maximum
   value check in rzg2l_gpt_round_waveform_tohw().
v3->v4:
 * Added wave form callback conversion back to this patch series.
 * Updated rzg2l_gpt_is_ch_enabled() fit into 80-character limit for
   consistency with other functions.
 * Dropped field_{get,prep} as mainline now support it.
 * Updated commit description for patch#3
 * Retained RZG2L_GTCR_TPCS bit definitons
 * Replaced gtcr_tpcs_mask->gtcr_tpcs
 * Updated commit header and description for patch#4
 * Renamed prescale_pow_of_two_mult_factor->prescale_mult
 * Added RZG3E_GTCR_TPCS bit definition for RZ/G3E and added to
   rzg3e_data.
 * Added error checks on suspend() and device set to operational state
   on failure().
 * Added Rb tag from Geert for SoC dtsi.
 * Added SW_GPIO9_CAN1_STB check to gpt0 node.
v2->v3:
 * Added Rb tag from Rob for bindings patch
 * Dropped wave form callback conversion from this patch series as
   it is covered in another series[1]
 * Added suspend/resume support.
v1->v2:
 * Created separate document for RZ/G3E GPT.
 * Updated commit header and description for binding patch.
 * Added waveform callback conversion to this series.
 * Collected tag.
 * Added link to hardware manual
 * Updated limitation section in driver patch.

Biju Das (9):
  pwm: rzg2l-gpt: Fix macro used for period/duty cycle conversion
  pwm: rzg2l-gpt: Convert to waveform callbacks
  pwm: rzg2l-gpt: Add info variable to struct rzg2l_gpt_chip
  pwm: rzg2l-gpt: Add prescale_mult variable to struct rzg2l_gpt_info
  pwm: rzg2l-gpt: Add calculate_prescale() callback to struct
    rzg2l_gpt_info
  dt-bindings: pwm: Document RZ/G3E GPT support
  pwm: rzg2l-gpt: Add RZ/G3E support
  dt-bindings: pwm: rzg2l-gpt: Document renesas,poegs property
  pwm: rzg2l-gpt: Add support for gpt linking with poeg

 .../bindings/pwm/renesas,rzg2l-gpt.yaml       |  23 ++
 .../bindings/pwm/renesas,rzg3e-gpt.yaml       | 323 +++++++++++++++
 drivers/pwm/pwm-rzg2l-gpt.c                   | 376 ++++++++++++++----
 3 files changed, 634 insertions(+), 88 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pwm/renesas,rzg3e-gpt.yaml


base-commit: 17b4db6750cedbf4b22fa3895631465a5688cff0
-- 
2.43.0