[Hikey960] Spi 调试进阶之番外篇(GPIO 设置)
转自：https://bbs.alpha-star.org/%E8%B ... -%E8%AE%BE%E7%BD%AE在编写设备驱动中，我们经常会遇到GPIO操作，在hikey960 中会有什么不同呢？我在check spi 控制器代码时有关注SPI_CS信号的获取以及操作，如下代码：https://bbs.alpha-star.org/wp-content/uploads/wpforo/attachments/26/thumbnail/16-1.pngSPI_CS信号是从dts 中 cs_gpios获取的，如下代码：
spi4: spi@fdf06000 {
compatible = "arm,pl022", "arm,primecell";
reg = <0x0 0xfdf06000 0x0 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
interrupts = <0 313 4>;
clocks = <&crg_ctrl HI3660_CLK_GATE_SPI4>;
clock-names = "apb_pclk";
pinctrl-names = "default";
pinctrl-0 = <&spi4_pmx_func &spi4_cfg_func>;
num-cs = <1>;
cs-gpios = <&gpio27 2 0>; /*cs : 218*/
//status = "disabled";
status = "ok";
};
cs_gpios 对应的gpio 编号为218。然而，我们从dts上面获取的cs_gpio = 290，很诡异呀。所以就催生了我研究hikey960 gpio子系统，代码架构后续再更新，先解决下上面看到的疑惑呀。https://bbs.alpha-star.org/wp-content/uploads/wpforo/attachments/26/thumbnail/17-2.pnghttps://bbs.alpha-star.org/wp-content/uploads/wpforo/attachments/26/thumbnail/15-3.png<p style="line-height: 18px;">gpio27: gpio@fff10000 {</p><p style="line-height: 18px;">compatible = "arm,pl061", "arm,primecell", "arm,primecell27";</p><p style="line-height: 18px;">reg = <0 0xfff10000 0 0x1000>;</p><p style="line-height: 18px;">interrupts = <0 111 0x4>;</p><p style="line-height: 18px;">gpio-controller;</p><p style="line-height: 18px;">#gpio-cells = <2>;</p><p style="line-height: 18px;">/* GPIO216 */</p><p style="line-height: 18px;">gpio-ranges = <&pmx4 0 36 6>;</p><p style="line-height: 18px;">interrupt-controller;</p><p style="line-height: 18px;">#interrupt-cells = <2>;</p><p style="line-height: 18px;">clocks = <&sctrl HI3660_PCLK_AO_GPIO5>;</p><p style="line-height: 18px;">clock-names = "apb_pclk";</p><p style="line-height: 18px;">status = "ok";</p><p style="line-height: 18px;">};</p>218在上述ｇｐｉｏ２７这个分组里面，看来ｇｐｉｏｃｈｉｐ２８８ 对应gpio@fff10000 控制器。在我验证后，得出结论，给出如下对应表格：https://bbs.alpha-star.org/wp-content/uploads/wpforo/attachments/26/14-4.png
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