1*c66ec88fSEmmanuel VadotSiFive PWM controller 2*c66ec88fSEmmanuel Vadot 3*c66ec88fSEmmanuel VadotUnlike most other PWM controllers, the SiFive PWM controller currently only 4*c66ec88fSEmmanuel Vadotsupports one period for all channels in the PWM. All PWMs need to run at 5*c66ec88fSEmmanuel Vadotthe same period. The period also has significant restrictions on the values 6*c66ec88fSEmmanuel Vadotit can achieve, which the driver rounds to the nearest achievable period. 7*c66ec88fSEmmanuel VadotPWM RTL that corresponds to the IP block version numbers can be found 8*c66ec88fSEmmanuel Vadothere: 9*c66ec88fSEmmanuel Vadot 10*c66ec88fSEmmanuel Vadothttps://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm 11*c66ec88fSEmmanuel Vadot 12*c66ec88fSEmmanuel VadotRequired properties: 13*c66ec88fSEmmanuel Vadot- compatible: Should be "sifive,<chip>-pwm" and "sifive,pwm<version>". 14*c66ec88fSEmmanuel Vadot Supported compatible strings are: "sifive,fu540-c000-pwm" for the SiFive 15*c66ec88fSEmmanuel Vadot PWM v0 as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the 16*c66ec88fSEmmanuel Vadot SiFive PWM v0 IP block with no chip integration tweaks. 17*c66ec88fSEmmanuel Vadot Please refer to sifive-blocks-ip-versioning.txt for details. 18*c66ec88fSEmmanuel Vadot- reg: physical base address and length of the controller's registers 19*c66ec88fSEmmanuel Vadot- clocks: Should contain a clock identifier for the PWM's parent clock. 20*c66ec88fSEmmanuel Vadot- #pwm-cells: Should be 3. See pwm.yaml in this directory 21*c66ec88fSEmmanuel Vadot for a description of the cell format. 22*c66ec88fSEmmanuel Vadot- interrupts: one interrupt per PWM channel 23*c66ec88fSEmmanuel Vadot 24*c66ec88fSEmmanuel VadotExamples: 25*c66ec88fSEmmanuel Vadot 26*c66ec88fSEmmanuel Vadotpwm: pwm@10020000 { 27*c66ec88fSEmmanuel Vadot compatible = "sifive,fu540-c000-pwm", "sifive,pwm0"; 28*c66ec88fSEmmanuel Vadot reg = <0x0 0x10020000 0x0 0x1000>; 29*c66ec88fSEmmanuel Vadot clocks = <&tlclk>; 30*c66ec88fSEmmanuel Vadot interrupt-parent = <&plic>; 31*c66ec88fSEmmanuel Vadot interrupts = <42 43 44 45>; 32*c66ec88fSEmmanuel Vadot #pwm-cells = <3>; 33*c66ec88fSEmmanuel Vadot}; 34