Goodix gt9xx series touch controller driver

Signed-off-by: wangyafei <wangyafei@goodix.com>

README.txt

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+Step 1. Modify Makefile：
+    Modify drivers/input/touchscreen/Makefile，add a new line into it ： 
+        obj-$(CONFIG_TOUCHSCREEN_GT9XX) += gt9xx/	
+
+Step 2. Modify Kconfig
+    Modify drivers/input/touchscreen/Kconfig, include our kconfig under TOUCHSCREEN
+	source "drivers/input/touchscreen/gt9xx/Kconfig" 
+
+Step 3. Port dtsi：
+    Port kernel/arch/arm/boot/dts/goodix-gt9xx-i2c.dtsi into platform dts
+	During the porting, please set right value into below fields
+	    interrupt-parent = <&msm_gpio>;
+	    interrupts = <13 0x2800>;
+	    reset-gpios = <&msm_gpio 12 0x0>;
+	    irq-gpios = <&msm_gpio 13 0x2800>;
+	    touchscreen-size-x = <1080>;
+	    touchscreen-size-y = <1920>;
+
+Step 4. Implement Pinctrl
+    Goodix dts declared 4 pinctrl：
+	     <&ts_int_default>;	<&ts_int_output_low>;<&ts_int_output_high>;<&ts_int_input>;
+    Please implement them in pinctrl dts.
+	kernel/arch/arm/boot/dts/msm8916-pinctrl.dtsi is an example.
+
+Step 5. Modify defconfig
+	Please refer kernel/arch/arm/configs/msm_defconfig .
+		CONFIG_TOUCHSCREEN_GT9XX=y
+		CONFIG_TOUCHSCREEN_GT9XX_UPDATE=y
+		CONFIG_TOUCHSCREEN_GT9XX_DEBUG=y
+
+Step 6. The porting is done, please compile.

ReleaseNote.txt

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+//	Goodix GT9xx series Driver - Android Platform	//
+
+Revision Information
+--------------------
+V2.8    2017/11/01, wangyafei@gooix.com
+	- Reconstruction the driver.
+	- Remove GT9F series controller support
+	- Remove file firmware update
+	- Add request firmware update method
+	- Do coding style check
+
+V2.4	2014/11/28, caiyulong@goodix.com
+	 - device tree support, gpio and cfg can be parsed form either dts
+		 or the header file.
+	 - new wake-up method, support frame buffer(CONFIG_FB),
+		 i2c pm(CONFIG_PM), and earlysuspend.
+	 - modify input_dev->phys.
+	 - revise config group num to 0-5.
+	 - move esd switch to the front of firmware update in goodix_ts_probe.
+	 - check update status at the beginning of gtp_esd_check_func.
+	 - check update status at the beginning of goodix_ts_resume.
+	 - new method for checking config version when init panel, delete 
+		 ts->fixed_cfg.
+	 - add put_path in gup_check_fs_mounted.
+	 - correct calculating of firmware checksum in gup_check_update_file_fl.
+
+V2.2  2014/01/14, meta@goodix.com
+       - gt9xx_config for debug
+       - gesture wakeup
+       - pen separate input device, active-pen button support
+       - coordinates & keys optimization
+			 - multi-system supported
+			 - flashless update no pid vid compare   
+
+V2.0  2013/08/06, meta@goodix.com  
+       - compatible with GT9XXF
+       - send config after resume
+
+V1.8  2013/06/08, meta@goodix.com
+       - pen/stylus identification 
+       - read double check & fixed config support
+       - new esd & slide wakeup optimization
+
+V1.6  2013/03/11, meta@goodix.com
+       - new heartbeat/esd_protect mechanism(add external watchdog)
+       - doze mode, sliding wakeup 
+       - 3 more cfg_group(GT9 Sensor_ID: 0~5) 
+       - config length verification
+       - names & comments
+			 - replace guitar_client with i2c_connect_client;
+			 - support firmware header array update.      
+
+V1.4  2012/12/12, andrew@goodix.com    
+			 - add config auto update function;
+			 - modify enter_update_mode;
+			 - add update file cal checksum.
+
+V1.2	2012/10/1, andrew@goodix.com
+       - modify gtp_reset_guitar,slot report,tracking_id & 0x0F.
+       - add force update,GT9110P pid map                   
+V1.0	2012/08/31, andrew@goodix.com   
+       - first release.