fng-install:rtc: Added RTC detection for the TANARO

The TANARO will be produced with one of two RTC variants.
We detect the RTC by querying the first register during the
post-install and activate one of two devicetree overlays.

BCS 746-000877

recipes-bsp/fng-install/prepare-image.bb

@@ -7,6 +7,7 @@ LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/Apache-2.0;md5=89aea4e17d99a7ca
 RDEPENDS_${PN} = " \
     fng-install-postinstallation \
     sharedconf \
+    i2c-tools \
 "
 
 SRC_URI = " \
@@ -22,6 +23,10 @@ SRC_URI_append_mx6 = " \
     file://gf-prepare-xml2dto.sh \
 "
 
+SRC_URI_append_mx8 = " \
+    file://gf-prepare-rtc.sh \
+"
+
 do_configure_append_fng () {
     # Exchange the bootpartitions for Flash-N-Go System
     sed -i ${WORKDIR}/gf-prepare-kernel.sh -e 's|^BOOTPARTITIONS=".*|BOOTPARTITIONS="/dev/disk/by-label/Flash-N-Go /dev/mmcblk0p1 /dev/mmcblk1p1"|'
@@ -48,3 +53,8 @@ do_install_append_mx6() {
     ln -s ${sbindir}/gf-prepare-dt.sh ${D}${sysconfdir}/fng-postinstall/12-gf-prepare-dt
     ln -s ${sbindir}/gf-prepare-xml2dto.sh ${D}${sysconfdir}/fng-postinstall/13-gf-prepare-xml2dto
 }
+
+do_install_append_mx8() {
+    install -m 0755 ${WORKDIR}/gf-prepare-rtc.sh ${D}${sbindir}
+    ln -s ${sbindir}/gf-prepare-rtc.sh ${D}${sysconfdir}/fng-postinstall/14-gf-prepare-rtc
+}

recipes-bsp/fng-install/prepare-image/gf-prepare-rtc.sh

+#!/bin/sh
+
+# shellcheck source=../../../recipes-guf/sharedconf/sharedconf/gf-functions.sh
+if ! . /usr/sbin/gf-functions.sh; then
+    echo "Unable to include gf-functions"
+fi
+# shellcheck source=./gf-prepare-common.sh
+if ! . /usr/sbin/gf-prepare-common.sh; then
+    echo "Unable to include gf-prepare-common"
+fi
+
+poll_rtc() {
+    if i2cget -y 2 "$1" 0x00 2>&1 | grep -E '.*0x.*|.*Device or resource busy.*'; then
+        echo "Device found at address $1"
+        return 0
+    else
+        echo "No device found at address $1"
+        return 1
+    fi
+}
+
+# Get the directory containing the bootfiles
+mount_bootpartition BOOTFILES_DIR
+
+# Change into the boot directory
+cd "$BOOTFILES_DIR" || exit 1
+
+# RX8803
+if poll_rtc 0x32; then
+    append_overlay "rx8803-overlay.dtb"
+else
+    # PCF8563
+    if poll_rtc 0x51; then
+        append_overlay "pcf8563-overlay.dtb"
+    else
+        echo "Error: Unable to find any valid device"
+        exit 1
+    fi
+fi
+
+exit 0
+
+# vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4