apm821xx: add linux kernel 5.4 testing support

This patch adds support for the linux kernel version 5.4
as an optional testing kernel.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/target/linux/apm821xx/patches-5.4/803-hwmon-tc654-add-detection-routine.patch b/target/linux/apm821xx/patches-5.4/803-hwmon-tc654-add-detection-routine.patch
new file mode 100644
index 0000000000..f8b30ae1b3
--- /dev/null
+++ b/target/linux/apm821xx/patches-5.4/803-hwmon-tc654-add-detection-routine.patch
@@ -0,0 +1,65 @@
+From 694f9bfb8efaef8a33e8992015ff9d0866faf4a2 Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Sun, 17 Dec 2017 17:27:15 +0100
+Subject: [PATCH 1/2] hwmon: tc654 add detection routine
+
+This patch adds a detection routine for the TC654/TC655
+chips.  Both IDs are listed in the Datasheet.
+
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+---
+ drivers/hwmon/tc654.c | 29 +++++++++++++++++++++++++++++
+ 1 file changed, 29 insertions(+)
+
+--- a/drivers/hwmon/tc654.c
++++ b/drivers/hwmon/tc654.c
+@@ -64,6 +64,11 @@ enum tc654_regs {
+ /* Register data is read (and cached) at most once per second. */
+ #define TC654_UPDATE_INTERVAL		HZ
+ 
++/* Manufacturer and Version Identification Register Values */
++#define TC654_MFR_ID_MICROCHIP		0x84
++#define TC654_VER_ID			0x00
++#define TC655_VER_ID			0x01
++
+ struct tc654_data {
+ 	struct i2c_client *client;
+ 
+@@ -497,6 +502,29 @@ static const struct i2c_device_id tc654_
+ 	{}
+ };
+ 
++static int
++tc654_detect(struct i2c_client *new_client, struct i2c_board_info *info)
++{
++	struct i2c_adapter *adapter = new_client->adapter;
++	int manufacturer, product;
++
++	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
++		return -ENODEV;
++
++	manufacturer = i2c_smbus_read_byte_data(new_client, TC654_REG_MFR_ID);
++	if (manufacturer != TC654_MFR_ID_MICROCHIP)
++		return -ENODEV;
++
++	product = i2c_smbus_read_byte_data(new_client, TC654_REG_VER_ID);
++	if (!((product == TC654_VER_ID) || (product == TC655_VER_ID)))
++		return -ENODEV;
++
++	strlcpy(info->type, product == TC654_VER_ID ? "tc654" : "tc655",
++		I2C_NAME_SIZE);
++	return 0;
++}
++
++
+ MODULE_DEVICE_TABLE(i2c, tc654_id);
+ 
+ static struct i2c_driver tc654_driver = {
+@@ -505,6 +533,7 @@ static struct i2c_driver tc654_driver =
+ 		   },
+ 	.probe = tc654_probe,
+ 	.id_table = tc654_id,
++	.detect = tc654_detect,
+ };
+ 
+ module_i2c_driver(tc654_driver);