Yocto training support for imx93-frdm

common/yocto-imx93-frdm-labs-vars.tex

@@ -0,0 +1,3 @@
+\def\labbooktitle{Yocto Project and OpenEmbedded Training}
+\def\labbooksubtitle{imx93-frdm variant}
+\def\labboard{imx93-frdm}

common/yocto-imx93-frdm-title.tex

@@ -0,0 +1,2 @@
+\def \trainingurl{https://bootlin.com/training/yocto}
+\def \trainingtitle{Yocto Project and OpenEmbedded system development}

lab-data/yocto-imx93-frdm/bootlin-lab-data/nunchuk/linux/0001-Add-nunchuk-driver.patch

@@ -0,0 +1,262 @@
+From d39c48a071eb30802429a9ecd405734fdd67f2c5 Mon Sep 17 00:00:00 2001
+From: Antoine Picard <antoine.picard@bootlin.com>
+Date: Mon, 11 Aug 2025 15:04:00 +0200
+Subject: [PATCH 1/2] Add nunchuk driver
+
+Signed-off-by: Antoine Picard <antoine.picard@bootlin.com>
+---
+ drivers/input/joystick/Kconfig    |  13 ++
+ drivers/input/joystick/Makefile   |   1 +
+ drivers/input/joystick/wiichuck.c | 204 ++++++++++++++++++++++++++++++
+ 3 files changed, 218 insertions(+)
+ create mode 100644 drivers/input/joystick/wiichuck.c
+
+diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
+index ac6925ce8366..e155f724b789 100644
+--- a/drivers/input/joystick/Kconfig
++++ b/drivers/input/joystick/Kconfig
+@@ -207,6 +207,19 @@ config JOYSTICK_TWIDJOY
+ 	  To compile this driver as a module, choose M here: the
+ 	  module will be called twidjoy.
+
++config JOYSTICK_WIICHUCK
++	tristate "Nintendo Wiimote Extension connector on i2c bus"
++	depends on I2C
++	select INPUT_POLLDEV
++	help
++	  Say Y here if you have a Nintendo Wiimote extension connector
++	  attached directly to an i2c bus, like the Sparcfun Wiichuck adapter
++	  board.  This driver supports both the Nunchuk and the Classic
++	  Controller extensions.
++
++	  To compile this driver as a module, choose M here: the
++	  modules will be called wiichuck.
++
+ config JOYSTICK_ZHENHUA
+ 	tristate "5-byte Zhenhua RC transmitter"
+ 	select SERIO
+diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
+index 3937535f0098..7dee2e46303d 100644
+--- a/drivers/input/joystick/Makefile
++++ b/drivers/input/joystick/Makefile
+@@ -38,5 +38,6 @@ obj-$(CONFIG_JOYSTICK_TURBOGRAFX)	+= turbografx.o
+ obj-$(CONFIG_JOYSTICK_TWIDJOY)		+= twidjoy.o
+ obj-$(CONFIG_JOYSTICK_WARRIOR)		+= warrior.o
+ obj-$(CONFIG_JOYSTICK_WALKERA0701)	+= walkera0701.o
++obj-$(CONFIG_JOYSTICK_WIICHUCK)		+= wiichuck.o
+ obj-$(CONFIG_JOYSTICK_XPAD)		+= xpad.o
+ obj-$(CONFIG_JOYSTICK_ZHENHUA)		+= zhenhua.o
+diff --git a/drivers/input/joystick/wiichuck.c b/drivers/input/joystick/wiichuck.c
+new file mode 100644
+index 000000000000..9ba1c5b82a9b
+--- /dev/null
++++ b/drivers/input/joystick/wiichuck.c
+@@ -0,0 +1,204 @@
++// SPDX-License-Identifier: GPL-2.0
++/* Available on SOLUTION_URL */
++
++#include <linux/delay.h>
++#include <linux/i2c.h>
++#include <linux/init.h>
++#include <linux/input.h>
++#include <linux/module.h>
++#include <linux/version.h>
++
++/* Per device structure */
++struct nunchuk_dev {
++	struct i2c_client *i2c_client;
++};
++
++static int nunchuk_read_registers(struct i2c_client *client, u8 *recv)
++{
++	u8 buf[1];
++	int ret;
++
++	/* Ask the device to get ready for a read */
++	usleep_range(10000, 20000);
++
++	buf[0] = 0x00;
++	ret = i2c_master_send(client, buf, 1);
++	if (ret < 0) {
++		dev_err(&client->dev, "i2c send failed (%d)\n", ret);
++		return ret;
++	}
++
++	usleep_range(10000, 20000);
++
++	/* Now read registers */
++	ret = i2c_master_recv(client, recv, 6);
++	if (ret < 0) {
++		dev_err(&client->dev, "i2c recv failed (%d)\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static void nunchuk_poll(struct input_dev *input)
++{
++	u8 recv[6];
++	int zpressed, cpressed, bx, by;
++
++	/* Retrieve the physical i2c device */
++	struct nunchuk_dev *nunchuk = input_get_drvdata(input);
++	struct i2c_client *client = nunchuk->i2c_client;
++
++	/* Get the state of the device registers */
++	if (nunchuk_read_registers(client, recv) < 0)
++		return;
++
++	zpressed = (recv[5] & BIT(0)) ? 0 : 1;
++	cpressed = (recv[5] & BIT(1)) ? 0 : 1;
++	bx = recv[0];
++	by = recv[1];
++
++	/* Send events to the INPUT subsystem */
++	input_report_key(input, BTN_Z, zpressed);
++	input_report_key(input, BTN_C, cpressed);
++
++	input_report_abs(input, ABS_X, bx);
++	input_report_abs(input, ABS_Y, by);
++
++	input_sync(input);
++}
++
++static int nunchuk_probe(struct i2c_client *client)
++{
++	struct nunchuk_dev *nunchuk;
++	struct input_dev *input;
++	u8 buf[2];
++	int ret;
++
++	/* Allocate per device structure */
++	nunchuk = devm_kzalloc(&client->dev, sizeof(*nunchuk), GFP_KERNEL);
++	if (!nunchuk)
++		/* No message necessary here, already issued by allocation functions */
++		return -ENOMEM;
++
++	/* Initialize device */
++	buf[0] = 0xf0;
++	buf[1] = 0x55;
++
++	ret = i2c_master_send(client, buf, 2);
++	if (ret < 0) {
++		dev_err(&client->dev, "i2c send failed (%d)\n", ret);
++		return ret;
++	}
++
++	udelay(1000);
++
++	buf[0] = 0xfb;
++	buf[1] = 0x00;
++
++	ret = i2c_master_send(client, buf, 2);
++	if (ret < 0) {
++		dev_err(&client->dev, "i2c send failed (%d)\n", ret);
++		return ret;
++	}
++
++	/* Allocate input device */
++	input = devm_input_allocate_device(&client->dev);
++	if (!input)
++		return -ENOMEM;
++
++	/*
++	 * Implement pointers from logical to physical. Here, no need for
++	 * physical to logical pointers as unregistering and freeing the
++	 * polled_input device will be automatic.
++	 */
++	nunchuk->i2c_client = client;
++	input_set_drvdata(input, nunchuk);
++
++	/* Configure input device */
++	input->name = "Wii Nunchuk";
++	input->id.bustype = BUS_I2C;
++
++	set_bit(EV_KEY, input->evbit);
++	set_bit(BTN_C, input->keybit);
++	set_bit(BTN_Z, input->keybit);
++
++	set_bit(EV_ABS, input->evbit);
++	set_bit(ABS_X, input->absbit);
++	set_bit(ABS_Y, input->absbit);
++	input_set_abs_params(input, ABS_X, 30, 220, 4, 8);
++	input_set_abs_params(input, ABS_Y, 40, 200, 4, 8);
++
++	/* Classic buttons */
++	set_bit(BTN_TL, input->keybit);
++	set_bit(BTN_SELECT, input->keybit);
++	set_bit(BTN_MODE, input->keybit);
++	set_bit(BTN_START, input->keybit);
++	set_bit(BTN_TR, input->keybit);
++	set_bit(BTN_TL2, input->keybit);
++	set_bit(BTN_B, input->keybit);
++	set_bit(BTN_Y, input->keybit);
++	set_bit(BTN_A, input->keybit);
++	set_bit(BTN_X, input->keybit);
++	set_bit(BTN_TR2, input->keybit);
++
++	/* Register and configure polling function */
++	ret = input_setup_polling(input, nunchuk_poll);
++	if (ret) {
++		dev_err(&client->dev, "Failed to set polling function (%d)\n",
++			ret);
++		return ret;
++	}
++
++	input_set_poll_interval(input, 50);
++
++	/* Register the input device when everything is ready */
++	ret = input_register_device(input);
++	if (ret) {
++		dev_err(&client->dev, "Cannot register input device (%d)\n",
++			ret);
++		return ret;
++	}
++
++
++	pr_info("Nunchuk device probed successfully\n");
++	return 0;
++}
++
++#if KERNEL_VERSION(5, 16, 0) <= LINUX_VERSION_CODE
++static void nunchuk_remove(struct i2c_client *client)
++#else
++static int nunchuk_remove(struct i2c_client *client)
++#endif
++{
++	/*
++	 * Nothing to do here, as the polled_input device is automatically
++	 * unregistered and freed thanks to the use of
++	 * devm_input_allocate_device.
++	 */
++
++	pr_info("Nunchuk device removed successfully\n");
++	#if KERNEL_VERSION(5, 16, 0) > LINUX_VERSION_CODE
++    return 0;
++    #endif
++}
++
++/* Specification of supported Device Tree devices */
++static const struct of_device_id nunchuk_dt_match[] = {
++	{ .compatible = "nintendo,nunchuk" },
++	{ },
++};
++MODULE_DEVICE_TABLE(of, nunchuk_dt_match);
++
++/* Driver declaration */
++static struct i2c_driver nunchuk_driver = {
++	.driver = {
++		.name = "nunchuk",
++		.of_match_table = nunchuk_dt_match,
++	},
++	.probe = nunchuk_probe,
++	.remove = nunchuk_remove,
++};
++module_i2c_driver(nunchuk_driver);
++
++MODULE_LICENSE("GPL");
+\ No newline at end of file
+-- 
+2.43.0
+

lab-data/yocto-imx93-frdm/bootlin-lab-data/nunchuk/linux/0002-Add-description-of-nunchuck-on-i2c.patch

@@ -0,0 +1,36 @@
+From 14992179c3b01d073dd19d9e59658264595bf269 Mon Sep 17 00:00:00 2001
+From: Antoine Picard <antoine.picard@bootlin.com>
+Date: Mon, 11 Aug 2025 15:16:13 +0200
+Subject: [PATCH 2/2] Add description of nunchuck on i2c
+
+Signed-off-by: Antoine Picard <antoine.picard@bootlin.com>
+---
+ arch/arm64/boot/dts/freescale/imx93-11x11-frdm.dts | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arm64/boot/dts/freescale/imx93-11x11-frdm.dts b/arch/arm64/boot/dts/freescale/imx93-11x11-frdm.dts
+index d219e244d53b..db415ed223c6 100644
+--- a/arch/arm64/boot/dts/freescale/imx93-11x11-frdm.dts
++++ b/arch/arm64/boot/dts/freescale/imx93-11x11-frdm.dts
+@@ -353,12 +353,17 @@ &lpm {
+ &lpi2c1 {
+ 	#address-cells = <1>;
+ 	#size-cells = <0>;
+-	clock-frequency = <400000>;
++	clock-frequency = <100000>;
+ 	pinctrl-names = "default", "sleep";
+ 	pinctrl-0 = <&pinctrl_lpi2c1>;
+ 	pinctrl-1 = <&pinctrl_lpi2c1>;
+ 	status = "okay";
+
++	nunchuk: joystick@52 {
++		compatible = "nintendo,nunchuk";
++		reg = <0x52>;
++	};
++
+ 	lvds_bridge: lvds-to-hdmi-bridge@4c {
+ 		compatible = "ite,it6263";
+ 		reg = <0x4c>;
+-- 
+2.43.0
+