Linux-GPIO 配置pull up、pull down、no pull

|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| author | daisy.skye的博客_CSDN博客-Qt,嵌入式,Linux领域博主 https://blog.csdn.net/qq_40715266?type=blog |
| 系列 | 基于RK3568的Linux驱动开发------GPIO知识点（一）_daisy.skye的博客-CSDN博客基于RK3568的Linux驱动开发------ GPIO知识点（二）_daisy.skye的博客-CSDN博客 |

|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| adb 查看显示不同的状态 | |
| NO PULL | bias-disable; /* No PULL */ drive-strength = <2>; /* 2 MA */ |

代码修改：

复制代码

			qdsd_cmd_trace: cmd_trace {`
				`config` `{`
`					pins =` `"gpio2";`
`					bias-pull-down;` `/* pull down */`
`					drive-strength =` `<2>;` `/* 2 MA */`
				`};`
			`};`
`			qdsd_cmd_swduart: cmd_uart {`
				`config` `{`
`					pins =` `"gpio3";`
`					bias-pull-up;` `/* pull up */`
`					drive-strength =` `<2>;` `/* 2 MA */`
				`};`
			`};`
`			qdsd_cmd_jtag: cmd_jtag {`
				`config` `{`
`					pins =` `"gpio4";`
`					bias-disable;` `/* NO pull */`
`					drive-strength =` `<8>;` `/* 8 MA */`
				`};`
			`};`
`