systemd: Add udev rules for persistent naming of the can devices

When multiple CAN's are present, then names that are getting assigned
change after every boot even after providing alias in the device
tree.
So add udev rules to specify the interface name to use for
each mcan device, to make it persistent across reboots.

Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com>
Signed-off-by: Aniket Limaye <a-limaye@ti.com>
Signed-off-by: Ryan Eatmon <reatmon@ti.com>

5 files changed, 45 insertions, 0 deletions

diff --git a/meta-arago-distro/recipes-core/systemd/systemd/37-can-am62.rules b/meta-arago-distro/recipes-core/systemd/systemd/37-can-am62.rules
new file mode 100644
index 00000000..59dc8075
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/37-can-am62.rules
@@ -0,0 +1,4 @@
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="4e08000.can", NAME="mcu_mcan0"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="4e18000.can", NAME="mcu_mcan1"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="20701000.can", NAME="main_mcan0"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="20711000.can", NAME="main_mcan1"
diff --git a/meta-arago-distro/recipes-core/systemd/systemd/37-can-dra7.rules b/meta-arago-distro/recipes-core/systemd/systemd/37-can-dra7.rules
new file mode 100644
index 00000000..3b14150d
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/37-can-dra7.rules
@@ -0,0 +1,2 @@
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="4ae3c000.can", NAME="main_dcan1"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="48480000.can", NAME="main_dcan2"
diff --git a/meta-arago-distro/recipes-core/systemd/systemd/37-can-j7.rules b/meta-arago-distro/recipes-core/systemd/systemd/37-can-j7.rules
new file mode 100644
index 00000000..f2804ecd
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/37-can-j7.rules
@@ -0,0 +1,20 @@
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="40528000.can", NAME="mcu_mcan0"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="40568000.can", NAME="mcu_mcan1"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2701000.can", NAME="main_mcan0"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2711000.can", NAME="main_mcan1"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2721000.can", NAME="main_mcan2"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2731000.can", NAME="main_mcan3"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2741000.can", NAME="main_mcan4"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2751000.can", NAME="main_mcan5"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2761000.can", NAME="main_mcan6"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2771000.can", NAME="main_mcan7"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2781000.can", NAME="main_mcan8"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2791000.can", NAME="main_mcan9"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="27a1000.can", NAME="main_mcan10"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="27b1000.can", NAME="main_mcan11"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="27c1000.can", NAME="main_mcan12"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="27d1000.can", NAME="main_mcan13"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2681000.can", NAME="main_mcan14"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="2691000.can", NAME="main_mcan15"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="26a1000.can", NAME="main_mcan16"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="26b1000.can", NAME="main_mcan17"
diff --git a/meta-arago-distro/recipes-core/systemd/systemd/37-can-ti33x.rules b/meta-arago-distro/recipes-core/systemd/systemd/37-can-ti33x.rules
new file mode 100644
index 00000000..62d650fe
--- /dev/null
+++ b/meta-arago-distro/recipes-core/systemd/systemd/37-can-ti33x.rules
@@ -0,0 +1,2 @@
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="481cc000.can", NAME="main_dcan0"
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="481d0000.can", NAME="main_dcan1"
diff --git a/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend b/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
index f38606f2..428a16f7 100644
--- a/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-arago-distro/recipes-core/systemd/systemd_%.bbappend
@@ -12,6 +12,10 @@ SRC_URI:append = " \
     file://60-usb.network \
     file://sync-clocks.service \
     file://timesyncd.conf \
+    file://37-can-j7.rules \
+    file://37-can-am62.rules \
+    file://37-can-dra7.rules \
+    file://37-can-ti33x.rules \
 "
 
 do_install:append() {
@@ -42,4 +46,17 @@ do_install:append() {
 
     install -d ${D}${sysconfdir}/systemd/
     install -m 0644 ${WORKDIR}/timesyncd.conf ${D}${sysconfdir}/systemd/
+
+    install -d ${D}${libdir}/udev/rules.d
+    install -m 0644 ${WORKDIR}/37-can-j7.rules ${D}${libdir}/udev/rules.d/
+    install -m 0644 ${WORKDIR}/37-can-am62.rules ${D}${libdir}/udev/rules.d/
+    install -m 0644 ${WORKDIR}/37-can-dra7.rules ${D}${libdir}/udev/rules.d/
+    install -m 0644 ${WORKDIR}/37-can-ti33x.rules ${D}${libdir}/udev/rules.d/
 }
+
+FILES:udev += " \
+    ${libdir}/udev/rules.d/37-can-j7.rules \
+    ${libdir}/udev/rules.d/37-can-am62.rules \
+    ${libdir}/udev/rules.d/37-can-dra7.rules \
+    ${libdir}/udev/rules.d/37-can-ti33x.rules \
+"