[v2,0/5] Add RZ/V2{M, MA} PWM driver support

Message

Biju Das Nov. 24, 2022, 7:16 p.m. UTC

The RZ/V2{M, MA} PWM Timer (PWM) is composed of 16 channels. Linux is only
allowed access to channels 8 to 14 on RZ/V2M, while there is no restriction
for RZ/V2MA.

The RZ/V2{M, MA} PWM Timer (PWM) supports the following functions:
 * The PWM has 24-bit counters which operate at PWM_CLK (48 MHz).
 * The frequency division ratio for internal counter operation is selectable
    as PWM_CLK divided by 1, 16, 256, or 2048.
 * The period as well as the duty cycle is adjustable.
 * The low-level and high-level order of the PWM signals can be inverted.
 * The duty cycle of the PWM signal is selectable in the range from 0 to 100%.
 * The minimum resolution is 20.83 ns.
 * Three interrupt sources: Rising and falling edges of the PWM signal and
   clearing of the counter
 * Counter operation and the bus interface are asynchronous and both can
   operate independently of the magnitude relationship of the respective
   clock periods.

v1->v2:
 * Updated commit description
 * Replaced pwm8_15_pclk->cperi_grpf
 * Added reset entry R9A09G011_PWM_GPF_PRESETN
 * Added Rb tag from Krzysztof for bindings and the keep the Rb tag as 
   the below changes are trivial
 * Updated the description for APB clock
 * Added resets required property
 * Updated the example with resets property
 * Replaced devm_reset_control_get_optional_shared->devm_reset_control_get_shared
 * Added resets property in pwm nodes.

Note:
 Hardware manual for this IP can be found here
 https://www.renesas.com/in/en/document/mah/rzv2m-users-manual-hardware?language=en

Biju Das (5):
  clk: renesas: r9a09g011: Add PWM clock and reset entries
  dt-bindings: pwm: Add RZ/V2M PWM binding
  pwm: Add support for RZ/V2M PWM driver
  arm64: dts: renesas: r9a09g011: Add pwm nodes
  arm64: dts: renesas: rzv2m evk: Enable pwm

 .../bindings/pwm/renesas,rzv2m-pwm.yaml       |  90 ++++
 .../boot/dts/renesas/r9a09g011-v2mevk2.dts    |  70 ++++
 arch/arm64/boot/dts/renesas/r9a09g011.dtsi    |  98 +++++
 drivers/clk/renesas/r9a09g011-cpg.c           |  10 +
 drivers/pwm/Kconfig                           |  11 +
 drivers/pwm/Makefile                          |   1 +
 drivers/pwm/pwm-rzv2m.c                       | 390 ++++++++++++++++++
 7 files changed, 670 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/renesas,rzv2m-pwm.yaml
 create mode 100644 drivers/pwm/pwm-rzv2m.c