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. v5->v6: * Updated copyright in driver (2023->2024). * Several improvements to the driver, as suggested by Uwe. v4->v5: * rebased to pwm for-next. * Sorted KConfig file * Sorted Make file * Updated copyright header 2022->2023. * Updated limitation section. * Replaced the variable chip->rzv2m_pwm in rzv2m_pwm_wait_delay() * Replaced polarity logic as per HW manual dutycycle = Ton/Ton+Toff, so eventhough native polarity is inverted from period point of view it is correct. * Updated logic for supporting 0% , 100% and remaining duty cycles. * On config() replaced * pm_runtime_resume_and_get()->pm_runtime_get_sync() * Counter is stopped while updating period/polarity to avoid glitches. * Added error check for clk_prepare_enable() * Introduced is_ch_enabled variable to cache channel enable status. * clk_get_rate is called after enabling the clock and * clk_rate_exclusive_get() * Added comment for delay * Replaced 1000000000UL->NSEC_PER_SEC. * Improved error handling in probe(). v3->v4: * Documented the hardware properties in "Limitations" section * Dropped the macros F2CYCLE_NSEC, U24_MASK and U24_MAX. * Added RZV2M_PWMCYC_PERIOD macro for U24_MAX * Dropped rzv2m_pwm_freq_div variable and started using 1 << (4 * i) for calculating divider as it is power of 16. * Reordered the functions to have rzv2m_pwm_config() directly before rzv2m_pwm_apply(). * Improved the logic for calculating period and duty cycle in config() * Merged multiple RZV2M_PWMCTR register writes to a single write in * config() * replaced pwm_is_enabled()->pwm->state.enabled * Avoided assigning bit value as enum pwm_polarity instead used enum * constant. * Fixed various issues in probe error path. * Updated the logic for PWM cycle setting register * A 100% duty cycle is only possible with PWMLOW > PWMCYC. So restricting PWMCYC values < 0xffffff * The native polarity of the hardware is inverted (i.e. it starts with * the * low part). So switched the inversion bit handling. v2->v3: * Removed clock patch#1 as it is queued for 6.3 renesas-clk * Added Rb tag from Geert for bindings and dt patches * Added return code for rzv2m_pwm_get_state() * Added comment in rzv2m_pwm_reset_assert_pm_disable() 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. Biju Das (4): 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/pwm/Kconfig | 11 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-rzv2m.c | 469 ++++++++++++++++++ 6 files changed, 739 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/renesas,rzv2m-pwm.yaml create mode 100644 drivers/pwm/pwm-rzv2m.c -- 2.34.1