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linux 项目dts定制开发---不侵入原厂sdk 的代码

  • 2026-08-18 23:10:47
linux 项目dts定制开发---不侵入原厂sdk 的代码
背景:
项目开发时从soc厂商那里拿到一个版本的sdk,后续有极大可能需要进版(原厂又解决了一些公共问题)。  如果我们的修改入侵到原厂的代码里,就会导致后续进版sdk有很多的冲突项。

一、整体思路与好处

现状

  • SDK 的设备树在 sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/,其中 rk3572.dtsi(SoC 级)、rk3572-evb1-v10.dtsi  SDK 维护板级设备树。

  • 我们板子的设备树是 customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts,属于 customers/ 这一层(customers -> sdk/device/cvt 是 symlink,是我们自己的目录)。

核心做法:board dts #include SDK dtsi,只做"增量覆盖"

板级 dts 顶部:

/dts-v1/;#include"rk3572-evb1-v10.dtsi"/* SDK 公板 dtsi */#include"rk3572-linux.dtsi".../ {    compatible = "rockchip,rk3572-evb1-v10""rockchip,rk3572";    model = "Rockchip RK3572 customer V10 Board";    ...                                /* 板子自己的新增节点放这里 */};

然后所有对 SDK 的差异都用 &label { ... } 引用 + 覆盖实现:删节点、删属性、改属性、加属性、加子节点。不动 SDK dtsi 一个字。

这样做的好处

  1. SDK 升级冲突最小:SDK 进新版本时,rk3572.dtsi/rk3572-evb1-v10.dtsi 会变,但我们没改过它们,merge 时几乎不冲突。我们的定制全集中在 board dts 一个文件里,rebase 这个文件即可。

  2. 意图清晰:board dts 里出现的 &xxx 块,全是"和公板的差异",review 一眼能看出这块板子和公板不同在哪。

  3. 可回退:把某个 &xxx 块注释掉,就回到 SDK 默认行为,便于对比排查。

  4. 同样适用于 kernel configcustomer_defconfig.config 是一个 config 片段,叠加在 rockchip_linux_defconfig 上(CONFIG_customer_* 等),同样不碰 SDK defconfig,升级零冲突。

反例(不要这样做):直接去 sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-evb1-v10.dtsi 里改属性/删节点。这会污染 SDK,升级时整片冲突,且改了什么无迹可循。


二、构建链路(知道 dtb 从哪来)

customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts    源(我们维护)          构建时拷贝(inode 不同,是 copy 不是 symlink)        sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dts          dtc 编译        sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dtb   最终产物          打包进 boot.img / resource.img        设备 /sys/firmware/devicetree/base/...

关键点:改了 customers/.../rk3572-customer-v10-linux.dts 后,必须重新走一遍"拷贝+编译+打包+烧录"。如果只编了一半或烧了旧 dtb,设备上跑的还是老的——这次排查就栽在这上面过(改了源码但烧的是改之前的 dtb,白排查一轮)。


三、四种常用定制操作

1. 改属性 / 加属性(&label { ... } 覆盖)

引用 SDK 已有节点,直接写新值。同名属性后写覆盖先写;新属性就是新增。

&usb_drd0_dwc3 {    dr_mode = "peripheral";          /* 覆盖 SDK 的 "otg" */    maximum-speed = "high-speed";    /* 新增 */    phys = <&u2phy0_otg>;            /* 覆盖:去掉 combphy0_psu,只留 USB2 */    phy-names = "usb2-phy";    snps,dis_u2_susphy_quirk;        /* 新增布尔属性 */    status = "okay";                 /* 覆盖 SDK 的 "disabled" */};

2. 删属性(/delete-property/

在 &label { } 块里删 SDK 设的某个属性:

&u2phy0_otg {    /delete-property/ rockchip,typec-vbus-det;   /* 删公板的 type-C VBUS 检测 */    status = "okay";};&vbus5v0_typec {    /delete-property/ gpio;    /delete-property/ pinctrl-names;    /delete-property/ pinctrl-0;};

注意:/delete-property/ 删一个本来就不存在的属性,dtc 静默忽略不报错(不会编译失败)。

3. 删节点(/delete-node/

两种写法,别搞混(这是高频坑)

(a) 顶层按 label 引用删(label 前要加 &):

/delete-node/ &wireless_bluetooth;/delete-node/ &rk730_es7210_sound;

放在 dts 顶层(不在任何 &node {} 块内)。&label 引用的是节点的 label。

(b) 父节点内按"子节点名"删(用节点的 unit name,不是 label,且不加 &):

&mdio1 {    /delete-node/ phy@1;          /* ✓ 删名为 phy@1 的子节点 */    yt8522c_phy: phy@0 {        compatible = "ethernet-phy-ieee802.3-c22";        reg = <0x0>;    };};

反面教训:在 &mdio1 { /delete-node/ rgmii_phy; } 里用裸 label rgmii_phy(既不是 &label 也不是节点名 phy@1),dtc 找不到名为 rgmii_phy 的子节点,静默不删,结果 rgmii_phy: phy@1 (reg=<1>) 还在 mdio1 里,注册时报 MDIO device at address 1 is missing。判断依据:报哪个 address,就是哪个 reg 的子节点没删干净。

4. 加节点

在已有父节点下加子节点,或顶层 / 下加新节点:

&mdio0 {    yt8522c_phy: phy@3 {        compatible = "ethernet-phy-ieee802.3-c22";        reg = <0x3>;             /* PHY 的 MDIO 地址,必须有 */                           };};

顶层加节点(board 自己的功能,SDK 没有的):

/ {    net_detect {        compatible = "customer,net-detect";        detect-gpios = <&gpio0 RK_PD1 GPIO_ACTIVE_LOW>,                       <&gpio0 RK_PD2 GPIO_ACTIVE_LOW>;    };};

四、验证最终 dtb 是否符合需求(三处对照)

改完源码 → 编译 → 烧录 → 设备运行,这四个环节的 dtb 必须一致。排查时三个地方都要看,任何一个不对都白搭。

1. 反编译构建产物 dtb(编译后、烧录前必查)

# 确认改动真的进了 dtbdtc -I dtb -O dts \  sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dtb \  > /tmp/out.dts 2>/dev/null# 看具体节点sed -n '/usb@24000000 {/,/};/p' /tmp/out.dts | grep -E "phys|phy-names|dr_mode|maximum-speed"# 看某属性是否还在(删了应查不到)grep -n "rockchip,typec-vbus-det" /tmp/out.dts# 看某节点是否还在grep -n "rgmii_phy\|phy@1" /tmp/out.dts

2. 设备运行中 dtb(烧录后、在板子上查)

# 属性是否存在(删了的应该 No such file)ls /sys/firmware/devicetree/base/soc/syscon@26054000/usb2-phy@0/otg-port/rockchip,typec-vbus-det# 期望: No such file or directory# 列某节点下所有属性ls -l /sys/firmware/devicetree/base/soc/usb@24000000/# 读字符串型属性值(status、compatible、dr_mode、phy-names)strings /sys/firmware/devicetree/base/soc/usb@24000000/dr_modestrings /sys/firmware/devicetree/base/soc/usb@24000000/status# 读数值型属性(reg、phys 等是二进制,用 hexdump)hexdump -C /sys/firmware/devicetree/base/soc/usb@24000000/phys

属性文件大小为 0 是正常的(布尔属性如 snps,dis_u2_susphy_quirk 就是 0 字节空文件,存在即生效)。

3. 对照源码 dts(确认源就是对的)

grep -n "typec-vbus-det\|orientation-switch\|combphy0_psu\|/delete-" \  customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts

三处一致才算数:源码 dts 有改 ✓ → 构建产物 dtb 反编译出改了 ✓ → 设备 /sys/firmware/devicetree 反映出改了 ✓。任何一处断层(最常见是"编了没烧""烧了旧 dtb"),现象就会和源码对不上,别急着怀疑驱动,先查这三处。

4. tmp 文件排查
rk平台在编译完设备树后,会在 sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/ 目录下有中间文件保留
注意:默认是隐藏文件,需要在文件管理器里面打开隐藏文件

五、典型场景对照表

需求写法位置
改某节点属性&label { prop = <val>; }任意位置
删某属性&label { /delete-property/ prop; }&label 块内
删某节点(按 label)/delete-node/ &label;顶层
删某子节点(按节点名)&parent { /delete-node/ child@addr; }父节点块内
加子节点&parent { newnode: child@x { ... }; }父节点块内
加顶层节点/ { newnode { ... }; };顶层

六、一页速查(排查 dtb 没生效)

# A. 源码改对没?grep -n "<关键字>" customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts# B. dtb 编进去没?(mtime 应晚于源码 dts)stat -c '%y %n' customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts \  sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dtbdtc -I dtb -O dts \  sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dtb 2>/dev/null \  | grep "<关键字>"# C. 设备上生效没?(adb connect 后)ls /sys/firmware/devicetree/base/soc/<node>/<property>   # 删了的应 No such filestrings /sys/firmware/devicetree/base/soc/<node>/<str-prop>

A→B→C 任意一环断了,现象就和源码对不上。先修通这条链,再去看驱动/硬件。


附:涉及路径速记

  • 板级 dts 源:customers/common/board/ID_BD_RK3572_01A/rk3572-customer-v10-linux.dts

  • SDK dtsi(不改):sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572.dtsirk3572-evb1-v10.dtsi

  • 构建产物 dtb:sdk/kernel-6.12/arch/arm64/boot/dts/rockchip/rk3572-customer-v10-linux.dtb

  • 板级 kernel config 片段(同理不改 SDK defconfig):customers/common/board/ID_BD_RK3572_01A/customer_defconfig.config

  • 设备运行 dtb 查看:/sys/firmware/devicetree/base/soc/...

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  1. CONNECT:[ UseTime:0.001030s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001525s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000724s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000697s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001346s ]
  6. SELECT * FROM `set` [ RunTime:0.014329s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001672s ]
  8. SELECT * FROM `article` WHERE `id` = 505991 LIMIT 1 [ RunTime:0.016519s ]
  9. UPDATE `article` SET `lasttime` = 1787331601 WHERE `id` = 505991 [ RunTime:0.015385s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.003968s ]
  11. SELECT * FROM `article` WHERE `id` < 505991 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.024433s ]
  12. SELECT * FROM `article` WHERE `id` > 505991 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004031s ]
  13. SELECT * FROM `article` WHERE `id` < 505991 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.040842s ]
  14. SELECT * FROM `article` WHERE `id` < 505991 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030492s ]
  15. SELECT * FROM `article` WHERE `id` < 505991 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.109978s ]
0.445262s