scripts: add checkpatch tool

Initial version of checkpatch tool cloned from zephyr project.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

.checkpatch.conf

@@ -0,0 +1,22 @@
+--emacs
+--no-tree
+--summary-file
+--show-types
+--max-line-length=80
+--min-conf-desc-length=1
+
+--ignore BRACES
+--ignore PRINTK_WITHOUT_KERN_LEVEL
+--ignore SPLIT_STRING
+--ignore VOLATILE
+--ignore CONFIG_EXPERIMENTAL
+--ignore AVOID_EXTERNS
+--ignore NETWORKING_BLOCK_COMMENT_STYLE
+--ignore DATE_TIME
+--ignore MINMAX
+--ignore CONST_STRUCT
+--ignore FILE_PATH_CHANGES
+--ignore BIT_MACRO
+--ignore PREFER_KERNEL_TYPES
+--ignore NEW_TYPEDEFS
+--ignore ARRAY_SIZE

scripts/do_checkpatch.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2019 STMicroelectronics .
+# Copyright (c) 2015 Intel Corporation.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+res=$1
+[ -z "$res" ] && res="checkpatch_log"
+[ -f ${res} ] && rm ${res}
+[ -f ${res}_error.types ] && rm ${res}_error.types
+[ -f ${res}_warning.types ] && rm ${res}_warning.types
+
+dirs_to_check="lib"
+files=$(for d in ${dirs_to_check}; do find $d/ -type f -name '*.[ch]'; done)
+
+for i in $files; do
+	./scripts/checkpatch.pl  --no-tree -f --emacs --summary-file --show-types --ignore BRACES,PRINTK_WITHOUT_KERN_LEVEL,SPLIT_STRING,PREFER_KERNEL_TYPES,NEW_TYPEDEFS --max-line-length=90 $i >> ${res}
+done
+grep ERROR: ${res} |cut -d : -f 3,4 |sort -u > ${res}_error.types
+grep WARNING: ${res} |cut -d : -f 3,4 |sort -u > ${res}_warning.types
+for i in `cat ${res}_error.types`; do
+	echo -n $i ' '; grep $i ${res} | wc -l
+done
+for i in `cat ${res}_warning.types`; do
+	echo -n $i ' '; grep $i ${res} | wc -l
+done