本文介绍如何在全志的硬件描述文件中添加PWM7的参数。这是一个针对Linux内核的设备树源文件（DTS）的修改，特定于全志的硬件平台。
以下是对修改的简要概述：
- 文件修改：文件路径为
lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1.dtsi。
添加pwm7的参数 diff --git a/lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1.dtsi b/lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1.dtsi index db8d122..102d0bd 100755 --- a/lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1.dtsi +++ b/lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1.dtsi @@ -1254,9 +1254,9 @@ pwm: pwm@01c23400 { compatible = "allwinner,sunxi-pwm"; reg = <0x0 0x01c23400 0x0 0x154>; - pwm-number = <1>; + pwm-number = <3>; pwm-base = <0x0>; - pwms = <&pwm0>, <&pwm1>; + pwms = <&pwm0>, <&pwm1>,<&pwm7>; }; pwm0: pwm0@01c23400 { @@ -1437,6 +1437,96 @@ reg_active_width = <0x10>; }; + pwm7: pwm7@01c23400 { + compatible = "allwinner,sunxi-pwm7"; + pinctrl-names = "active", "sleep"; + reg_base = <0x01c23400>; + reg_peci_offset = <0x00>; + reg_peci_shift = <0x07>; + reg_peci_width = <0x01>; + + reg_pis_offset = <0x04>; + reg_pis_shift = <0x07>; + reg_pis_width = <0x01>; + + reg_crie_offset = <0x10>; + reg_crie_shift = <0x07>; + reg_crie_width = <0x01>; + + reg_cfie_offset = <0x10>; + reg_cfie_shift = <0x01>; + reg_cfie_width = <0x01>; + + reg_cris_offset = <0x14>; + reg_cris_shift = <0x07>; + reg_cris_width = <0x01>; + + reg_cfis_offset = <0x14>; + reg_cfis_shift = <0x01>; + reg_cfis_width = <0x01>; + + reg_clk_src_offset = <0x20>; + reg_clk_src_shift = <0x07>; + reg_clk_src_width = <0x02>; + + reg_bypass_offset = <0x20>; + reg_bypass_shift = <0x05>; + reg_bypass_width = <0x01>; + + reg_clk_gating_offset = <0x2c>; + reg_clk_gating_shift = <0x04>; + reg_clk_gating_width = <0x01>; + + reg_clk_div_m_offset = <0x2c>; + reg_clk_div_m_shift = <0x00>; + reg_clk_div_m_width = <0x04>; + + reg_pdzintv_offset = <0x3c>; + reg_pdzintv_shift = <0x08>; + reg_pdzintv_width = <0x08>; + + reg_dz_en_offset = <0x3c>; + reg_dz_en_shift = <0x00>; + reg_dz_en_width = <0x01>; + + reg_enable_offset = <0x40>; + reg_enable_shift = <0x07>; + reg_enable_width = <0x01>; + + reg_cap_en_offset = <0x44>; + reg_cap_en_shift = <0x07>; + reg_cap_en_width = <0x01>; + + reg_period_rdy_offset = <0x140>; + reg_period_rdy_shift = <0x0b>; + reg_period_rdy_width = <0x01>; + + reg_pul_start_offset = <0x140>; + reg_pul_start_shift = <0x0a>; + reg_pul_start_width = <0x01>; + + reg_mode_offset = <0x140>; + reg_mode_shift = <0x09>; + reg_mode_width = <0x01>; + + reg_act_sta_offset = <0x140>; + reg_act_sta_shift = <0x08>; + reg_act_sta_width = <0x01>; + + reg_prescal_offset = <0x140>; + reg_prescal_shift = <0x00>; + reg_prescal_width = <0x08>; + + reg_entire_offset = <0x144>; + reg_entire_shift = <0x10>; + reg_entire_width = <0x10>; + + reg_active_offset = <0x144>; + reg_active_shift = <0x00>; + reg_active_width = <0x10>; + }; + +
- PWM节点修改：
- 在原有的
pwm节点中，pwm-number从<1>更改为<3>，这意味着现在有3个PWMs。 - 在
pwms属性中，添加了对pwm7的引用。
- 添加PWM7节点：
- 新增了一个名为
pwm7的节点，它描述了PWM7的各种属性和寄存器偏移量。 - 这个节点包含了PWM7的兼容性、引脚控制、各种寄存器的偏移量、位移和宽度等信息。
这些修改意味着现在系统可以识别和使用PWM7，并且为其配置了正确的参数。这对于需要调试使用PWM7的驱动程序来说是必要的。
