mirror of https://gitee.com/openkylin/linux.git
56 lines
2.1 KiB
Plaintext
56 lines
2.1 KiB
Plaintext
Freescale FlexTimer Module (FTM) PWM controller
|
|
|
|
The same FTM PWM device can have a different endianness on different SoCs. The
|
|
device tree provides a property to describing this so that an operating system
|
|
device driver can handle all variants of the device. Refer to the table below
|
|
for the endianness of the FTM PWM block as integrated into the existing SoCs:
|
|
|
|
SoC | FTM-PWM endianness
|
|
--------+-------------------
|
|
Vybrid | LE
|
|
LS1 | BE
|
|
LS2 | LE
|
|
|
|
Please see ../regmap/regmap.txt for more detail about how to specify endian
|
|
modes in device tree.
|
|
|
|
|
|
Required properties:
|
|
- compatible : should be "fsl,<soc>-ftm-pwm" and one of the following
|
|
compatible strings:
|
|
- "fsl,vf610-ftm-pwm" for PWM compatible with the one integrated on VF610
|
|
- "fsl,imx8qm-ftm-pwm" for PWM compatible with the one integrated on i.MX8QM
|
|
- reg: Physical base address and length of the controller's registers
|
|
- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
|
|
the cells format.
|
|
- clock-names: Should include the following module clock source entries:
|
|
"ftm_sys" (module clock, also can be used as counter clock),
|
|
"ftm_ext" (external counter clock),
|
|
"ftm_fix" (fixed counter clock),
|
|
"ftm_cnt_clk_en" (external and fixed counter clock enable/disable).
|
|
- clocks: Must contain a phandle and clock specifier for each entry in
|
|
clock-names, please see clock/clock-bindings.txt for details of the property
|
|
values.
|
|
- pinctrl-names: Must contain a "default" entry.
|
|
- pinctrl-NNN: One property must exist for each entry in pinctrl-names.
|
|
See pinctrl/pinctrl-bindings.txt for details of the property values.
|
|
- big-endian: Boolean property, required if the FTM PWM registers use a big-
|
|
endian rather than little-endian layout.
|
|
|
|
Example:
|
|
|
|
pwm0: pwm@40038000 {
|
|
compatible = "fsl,vf610-ftm-pwm";
|
|
reg = <0x40038000 0x1000>;
|
|
#pwm-cells = <3>;
|
|
clock-names = "ftm_sys", "ftm_ext",
|
|
"ftm_fix", "ftm_cnt_clk_en";
|
|
clocks = <&clks VF610_CLK_FTM0>,
|
|
<&clks VF610_CLK_FTM0_EXT_SEL>,
|
|
<&clks VF610_CLK_FTM0_FIX_SEL>,
|
|
<&clks VF610_CLK_FTM0_EXT_FIX_EN>;
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pinctrl_pwm0_1>;
|
|
big-endian;
|
|
};
|