WIP: Add support for SPI on GPIOs of Jetson Nano Device

layers/meta-balena-jetson/conf/machine/spi-jetson-nano.conf

@@ -0,0 +1,6 @@
+#@TYPE: Machine
+##@NAME: spi-jetson-nano
+##@DESCRIPTION: Machine configuration for SPI support on the Carrier Dev Board for Nvdia Jetson Nano
+
+MACHINEOVERRIDES = "jetson-nano:${MACHINE}"
+include conf/machine/jetson-nano.conf

layers/meta-balena-jetson/recipes-bsp/tegra-binaries/tegra210-flash_32.2.0.bb

@@ -27,6 +27,7 @@ SRC_URI = " \
 # them here instead of machine.conf.
 KERNEL_DEVICETREE_jetson-nano = "${DEPLOY_DIR_IMAGE}/tegra210-p3448-0000-p3449-0000-a02.dtb"
 KERNEL_DEVICETREE_jn30b-nano = "${DEPLOY_DIR_IMAGE}/tegra210-p3448-0002-p3449-0000-b00-jn30b-JP4.2.2.dtb"
+KERNEL_DEVICETREE_spi-jetson-nano = "${DEPLOY_DIR_IMAGE}/tegra210-p3448-0002-p3449-0000-b00-SPI-JP4.2.2.dtb"
 DTBFILE ?= "${@os.path.basename(d.getVar('KERNEL_DEVICETREE', True).split()[0])}"
 LNXSIZE ?= "67108864"
 

layers/meta-balena-jetson/recipes-core/images/resin-image.inc

@@ -6,8 +6,10 @@ do_rootfs_resinos-img_jetson-nano[depends] += " tegra210-flash:do_deploy \
 
 DTBFILE ?= "${@os.path.basename(d.getVar('KERNEL_DEVICETREE', True).split()[0])}"
 DTBFILE_jn30b-nano = "tegra210-p3448-0002-p3449-0000-b00-jn30b-JP4.2.2.dtb"
+DTBFILE_spi-jetson-nano = "tegra210-p3448-0002-p3449-0000-b00-SPI-JP4.2.2.dtb"
 
 # Name update files as partition names for easier updating
+
 RESIN_BOOT_PARTITION_FILES_jetson-nano = " \
     bootfiles/nvtboot_cpu.bin.encrypt:/bootfiles/TBC \
     bootfiles/${DTBFILE}.encrypt:/bootfiles/RP1 \

layers/meta-balena-jetson/recipes-kernel/linux/linux-tegra/0001-spi-patch-linux-drivers-gpio-tegra.patch

@@ -0,0 +1,22 @@
+diff a/kernel-source/drivers/gpio/gpio-tegra.c b/kernel-source/drivers/gpio/gpio-tegra.c
+--- kernel-source/drivers/gpio/gpio-tegra.c
++++ kernel-source/drivers/gpio/gpio-tegra_new.c
+@@ -223,10 +223,18 @@
+        return pinctrl_request_gpio(chip->base + offset);
+ }
+
++static void tegra_gpio_disable(struct tegra_gpio_info *tgi, int gpio)
++{
++       tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
++}
++
+ static void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
+ {
++       struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
++
+        pinctrl_free_gpio(chip->base + offset);
+        tegra_gpio_restore_gpio_state(offset);
++       tegra_gpio_disable(tgi, offset);
+ }
+
+ static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)

layers/meta-balena-jetson/recipes-kernel/linux/linux-tegra/tegra210-p3448-0002-p3449-0000-b00-SPI-JP4.2.2.dtb

@@ -0,0 +1 @@
+ToDo

layers/meta-balena-jetson/recipes-kernel/linux/linux-tegra_%.bbappend

@@ -33,6 +33,11 @@ SRC_URI_append_jetson-tx2 = " \
     file://0001-mttcan_ivc-Fix-build-failure-with-kernel-4.9.patch \
 "
 
+SRC_URI_append_spi-jetson-nano = " \
+    file://tegra210-p3448-0002-p3449-0000-b00-SPI-JP4.2.2.dtb \
+    file://0001-spi-patch-linux-drivers-gpio-tegra.patch \
+"
+
 SRC_URI_append_jn30b-nano = " \
     file://tegra210-p3448-0002-p3449-0000-b00-jn30b-JP4.2.2.dtb \
 "
@@ -190,6 +195,10 @@ do_deploy_append_blackboard-tx2() {
     cp ${WORKDIR}/tegra186-tx2-blackboard.dtb "${DEPLOYDIR}"
 }
 
+do_deploy_append_spi-jetson-nano() {
+    cp ${WORKDIR}/tegra210-p3448-0002-p3449-0000-b00-SPI-JP4.2.2.dtb "${DEPLOYDIR}"
+}
+
 do_deploy_append_jn30b-nano() {
     cp ${WORKDIR}/tegra210-p3448-0002-p3449-0000-b00-jn30b-JP4.2.2.dtb "${DEPLOYDIR}"
 }

spi-jetson-nano.coffee

@@ -0,0 +1,44 @@
+deviceTypesCommon = require '@resin.io/device-types/common'
+{ networkOptions, commonImg, instructions } = deviceTypesCommon
+
+BOARD_POWEROFF = 'Remove power from the board and insert frelshy burnt SD-CARD.'
+BOARD_POWERON  = 'Power on the board.'
+
+module.exports =
+	version: 1
+	slug: 'spi-jetson-nano'
+	aliases: [ 'spi-jetson-nano' ]
+	name: 'SPI Jetson Nano'
+	arch: 'aarch64'
+	state: 'experimental'
+	community: 'true'
+
+	instructions: [
+		instructions.ETCHER_SD
+		BOARD_POWEROFF
+		BOARD_POWERON
+	]
+
+	gettingStartedLink:
+		windows: 'https://docs.resin.io/jetson-nano/nodejs/getting-started/#adding-your-first-device'
+		osx: 'https://docs.resin.io/jetson-nano/nodejs/getting-started/#adding-your-first-device'
+		linux: 'https://docs.resin.io/jetson-nano/nodejs/getting-started/#adding-your-first-device'
+
+	supportsBlink: false
+
+	yocto:
+		machine: 'spi-jetson-nano'
+		image: 'resin-image'
+		fstype: 'resinos-img'
+		version: 'yocto-warrior'
+		deployArtifact: 'resin-image-spi-jetson-nano.resinos-img'
+		compressed: true
+
+	options: [ networkOptions.group ]
+
+	configuration:
+		config:
+			partition: 12
+			path: '/config.json'
+
+	initialization: commonImg.initialization