bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0315-Input-edt-ft5x06-Poll-the-device-if-no-interrupt-is-.patch b/target/linux/bcm27xx/patches-5.15/950-0315-Input-edt-ft5x06-Poll-the-device-if-no-interrupt-is-.patch
new file mode 100644
index 0000000000..402b149fca
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0315-Input-edt-ft5x06-Poll-the-device-if-no-interrupt-is-.patch
@@ -0,0 +1,98 @@
+From cd24e1ce67ea6e34d9ef0886858b8b5ac77bf847 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Fri, 6 Nov 2020 18:45:10 +0000
+Subject: [PATCH] Input: edt-ft5x06: Poll the device if no interrupt is
+ configured.
+
+Not all systems have the interrupt line wired up, so switch to
+polling the touchscreen off a timer if no interrupt line is
+configured.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/input/touchscreen/edt-ft5x06.c | 51 +++++++++++++++++++++-----
+ 1 file changed, 41 insertions(+), 10 deletions(-)
+
+--- a/drivers/input/touchscreen/edt-ft5x06.c
++++ b/drivers/input/touchscreen/edt-ft5x06.c
+@@ -72,6 +72,8 @@
+ #define EDT_DEFAULT_NUM_X		1024
+ #define EDT_DEFAULT_NUM_Y		1024
+ 
++#define POLL_INTERVAL_MS		17	/* 17ms = 60fps */
++
+ enum edt_pmode {
+ 	EDT_PMODE_NOT_SUPPORTED,
+ 	EDT_PMODE_HIBERNATE,
+@@ -130,6 +132,9 @@ struct edt_ft5x06_ts_data {
+ 
+ 	struct edt_reg_addr reg_addr;
+ 	enum edt_ver version;
++
++	struct timer_list timer;
++	struct work_struct work_i2c_poll;
+ };
+ 
+ struct edt_i2c_chip_data {
+@@ -279,6 +284,22 @@ out:
+ 	return IRQ_HANDLED;
+ }
+ 
++static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
++{
++	struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
++
++	schedule_work(&tsdata->work_i2c_poll);
++	mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
++}
++
++static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
++{
++	struct edt_ft5x06_ts_data *tsdata = container_of(work,
++			struct edt_ft5x06_ts_data, work_i2c_poll);
++
++	edt_ft5x06_ts_isr(0, tsdata);
++}
++
+ static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
+ 				     u8 addr, u8 value)
+ {
+@@ -1234,17 +1255,27 @@ static int edt_ft5x06_ts_probe(struct i2
+ 
+ 	i2c_set_clientdata(client, tsdata);
+ 
+-	irq_flags = irq_get_trigger_type(client->irq);
+-	if (irq_flags == IRQF_TRIGGER_NONE)
+-		irq_flags = IRQF_TRIGGER_FALLING;
+-	irq_flags |= IRQF_ONESHOT;
+-
+-	error = devm_request_threaded_irq(&client->dev, client->irq,
+-					NULL, edt_ft5x06_ts_isr, irq_flags,
+-					client->name, tsdata);
+-	if (error) {
+-		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+-		return error;
++	if (client->irq) {
++		irq_flags = irq_get_trigger_type(client->irq);
++		if (irq_flags == IRQF_TRIGGER_NONE)
++			irq_flags = IRQF_TRIGGER_FALLING;
++		irq_flags |= IRQF_ONESHOT;
++
++		error = devm_request_threaded_irq(&client->dev, client->irq,
++						  NULL, edt_ft5x06_ts_isr,
++						  irq_flags, client->name,
++						  tsdata);
++		if (error) {
++			dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
++			return error;
++		}
++	} else {
++		INIT_WORK(&tsdata->work_i2c_poll,
++			  edt_ft5x06_ts_work_i2c_poll);
++		timer_setup(&tsdata->timer, edt_ft5x06_ts_irq_poll_timer, 0);
++		tsdata->timer.expires = jiffies +
++					msecs_to_jiffies(POLL_INTERVAL_MS);
++		add_timer(&tsdata->timer);
+ 	}
+ 
+ 	error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);