0001 Freescale FlexTimer Module (FTM) PWM controller
0002
0003 The same FTM PWM device can have a different endianness on different SoCs. The
0004 device tree provides a property to describing this so that an operating system
0005 device driver can handle all variants of the device. Refer to the table below
0006 for the endianness of the FTM PWM block as integrated into the existing SoCs:
0007
0008 SoC | FTM-PWM endianness
0009 --------+-------------------
0010 Vybrid | LE
0011 LS1 | BE
0012 LS2 | LE
0013
0014 Please see ../regmap/regmap.txt for more detail about how to specify endian
0015 modes in device tree.
0016
0017
0018 Required properties:
0019 - compatible : should be "fsl,<soc>-ftm-pwm" and one of the following
0020 compatible strings:
0021 - "fsl,vf610-ftm-pwm" for PWM compatible with the one integrated on VF610
0022 - "fsl,imx8qm-ftm-pwm" for PWM compatible with the one integrated on i.MX8QM
0023 - reg: Physical base address and length of the controller's registers
0024 - #pwm-cells: Should be 3. See pwm.yaml in this directory for a description of
0025 the cells format.
0026 - clock-names: Should include the following module clock source entries:
0027 "ftm_sys" (module clock, also can be used as counter clock),
0028 "ftm_ext" (external counter clock),
0029 "ftm_fix" (fixed counter clock),
0030 "ftm_cnt_clk_en" (external and fixed counter clock enable/disable).
0031 - clocks: Must contain a phandle and clock specifier for each entry in
0032 clock-names, please see clock/clock-bindings.txt for details of the property
0033 values.
0034 - pinctrl-names: Must contain a "default" entry.
0035 - pinctrl-NNN: One property must exist for each entry in pinctrl-names.
0036 See pinctrl/pinctrl-bindings.txt for details of the property values.
0037 - big-endian: Boolean property, required if the FTM PWM registers use a big-
0038 endian rather than little-endian layout.
0039
0040 Example:
0041
0042 pwm0: pwm@40038000 {
0043 compatible = "fsl,vf610-ftm-pwm";
0044 reg = <0x40038000 0x1000>;
0045 #pwm-cells = <3>;
0046 clock-names = "ftm_sys", "ftm_ext",
0047 "ftm_fix", "ftm_cnt_clk_en";
0048 clocks = <&clks VF610_CLK_FTM0>,
0049 <&clks VF610_CLK_FTM0_EXT_SEL>,
0050 <&clks VF610_CLK_FTM0_FIX_SEL>,
0051 <&clks VF610_CLK_FTM0_EXT_FIX_EN>;
0052 pinctrl-names = "default";
0053 pinctrl-0 = <&pinctrl_pwm0_1>;
0054 big-endian;
0055 };
