docs/zh_CN: add iio ep93xx_adc.rst translation

This patch translates Documentation/iio/ep93xx_adc.rst into Chinese.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Reviewed-by: Huacai Chen <chenhuacai@kernel.org>
Link: https://lore.kernel.org/r/20210121033302.558935-2-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_CN/iio/ep93xx_adc.rst

+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: :doc:`../../../iio/ep93xx_adc`
+:Translator: Yanteng Si <siyanteng@loongson.cn>
+
+.. _cn_iio_ep93xx_adc:
+
+
+==================================
+思睿逻辑 EP93xx 模拟数字转换器驱动
+==================================
+
+1. 概述
+=======
+
+该驱动同时适用于具有5通道模拟数字转换器的低端 (EP9301, Ep9302) 设备和10通道
+触摸屏/模拟数字转换器的高端设备(EP9307, EP9312, EP9315)。
+
+2. 通道编号
+===========
+
+EP9301和EP9302数据表定义了通道0..4的编号方案。虽然EP9307, EP9312和EP9315多
+了3个通道（一共8个），但是编号并没有定义。所以说最后三个通道是随机编号的。
+
+如果ep93xx_adc是IIO设备0，您将在以下位置找到条目
+/sys/bus/iio/devices/iio:device0/:
+
+  +-----------------+---------------+
+  | sysfs 入口      | ball/pin 名称 |
+  +=================+===============+
+  | in_voltage0_raw | YM            |
+  +-----------------+---------------+
+  | in_voltage1_raw | SXP           |
+  +-----------------+---------------+
+  | in_voltage2_raw | SXM           |
+  +-----------------+---------------+
+  | in_voltage3_raw | SYP           |
+  +-----------------+---------------+
+  | in_voltage4_raw | SYM           |
+  +-----------------+---------------+
+  | in_voltage5_raw | XP            |
+  +-----------------+---------------+
+  | in_voltage6_raw | XM            |
+  +-----------------+---------------+
+  | in_voltage7_raw | YP            |
+  +-----------------+---------------+