initial buildroot for linux 5.15

package/c-periphery/Config.in

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+config BR2_PACKAGE_C_PERIPHERY
+	bool "c-periphery"
+	help
+	  c-periphery is a set of C wrapper functions for GPIO, SPI,
+	  I2C, MMIO, and Serial peripheral I/O interface access in
+	  userspace Linux. The c-periphery wrappers simplify and
+	  consolidate the native Linux APIs to these
+	  interfaces. c-periphery is useful in embedded Linux
+	  environments (including BeagleBone, Raspberry Pi,
+	  etc. platforms) for interfacing with external
+	  peripherals. c-periphery is re-entrant, uses static
+	  allocations, has no dependencies outside the standard C
+	  library and Linux, compiles into a static library for easy
+	  integration with other projects, and is MIT licensed.
+
+	  https://github.com/vsergeev/c-periphery

package/c-periphery/c-periphery.hash

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+# Locally calculated
+sha256  ba298aac5c1f6ebe2b89ed623a2f678bedfa3b9dc78aaf4f0534a1dd304629da  c-periphery-2.3.1.tar.gz
+sha256  7121a0a2ba36ed9388be2f1a916f0e3584d8e49cc7888fbcfcf83bab2a8bebef  LICENSE

package/c-periphery/c-periphery.mk

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+################################################################################
+#
+# c-periphery
+#
+################################################################################
+
+C_PERIPHERY_VERSION = 2.3.1
+C_PERIPHERY_SITE = $(call github,vsergeev,c-periphery,v$(C_PERIPHERY_VERSION))
+C_PERIPHERY_INSTALL_STAGING = YES
+C_PERIPHERY_LICENSE = MIT
+C_PERIPHERY_LICENSE_FILES = LICENSE
+C_PERIPHERY_CPE_ID_VENDOR = c-periphery_project
+
+$(eval $(cmake-package))