bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

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

1 files changed, 319 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0772-w1_therm-adding-alarm-sysfs-entry.patch b/target/linux/bcm27xx/patches-5.4/950-0772-w1_therm-adding-alarm-sysfs-entry.patch
new file mode 100644
index 0000000000..f4b8d5d1d6
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0772-w1_therm-adding-alarm-sysfs-entry.patch
@@ -0,0 +1,319 @@
+From 8c3d9356c3c3b9c9188f1e192c7e2541e313c7ab Mon Sep 17 00:00:00 2001
+From: Akira Shimahara <akira215corp@gmail.com>
+Date: Mon, 11 May 2020 22:38:01 +0200
+Subject: [PATCH] w1_therm: adding alarm sysfs entry
+
+commit e2c94d6f572079511945e64537eb1218643f2e68 upstream.
+
+Adding device alarms settings by a dedicated sysfs entry alarms (RW):
+read or write TH and TL in the device RAM. Checking devices in alarm
+state could be performed using the master search command.
+
+As alarms temperature level are store in a 8 bit register on the device
+and are signed values, a safe cast shall be performed using the min and
+max temperature that device are able to measure. This is done by
+int_to_short inline function.
+
+A 'write_data' field is added in the device structure, to bind the
+correct writing function, as some devices may have 2 or 3 bytes RAM.
+
+Updating Documentation/ABI/testing/sysfs-driver-w1_therm accordingly.
+
+Signed-off-by: Akira Shimahara <akira215corp@gmail.com>
+Link: https://lore.kernel.org/r/20200511203801.411253-1-akira215corp@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ .../ABI/testing/sysfs-driver-w1_therm         |  16 ++
+ drivers/w1/slaves/w1_therm.c                  | 161 ++++++++++++++++++
+ 2 files changed, 177 insertions(+)
+
+--- a/Documentation/ABI/testing/sysfs-driver-w1_therm
++++ b/Documentation/ABI/testing/sysfs-driver-w1_therm
+@@ -1,3 +1,19 @@
++What:		/sys/bus/w1/devices/.../alarms
++Date:		May 2020
++Contact:	Akira Shimahara <akira215corp@gmail.com>
++Description:
++		(RW) read or write TH and TL (Temperature High an Low) alarms.
++		Values shall be space separated and in the device range
++		(typical -55 degC to 125 degC), if not values will be trimmed
++		to device min/max capabilities. Values are integer as they are
++		stored in a 8bit register in the device. Lowest value is
++		automatically put to TL. Once set, alarms could be search at
++		master level, refer to Documentation/w1/w1_generic.rst for
++		detailed information
++Users:		any user space application which wants to communicate with
++		w1_term device
++
++
+ What:		/sys/bus/w1/devices/.../eeprom
+ Date:		May 2020
+ Contact:	Akira Shimahara <akira215corp@gmail.com>
+--- a/drivers/w1/slaves/w1_therm.c
++++ b/drivers/w1/slaves/w1_therm.c
+@@ -58,6 +58,9 @@ module_param_named(strong_pullup, w1_str
+ #define EEPROM_CMD_WRITE    "save"	/* cmd for write eeprom sysfs */
+ #define EEPROM_CMD_READ     "restore"	/* cmd for read eeprom sysfs */
+ 
++#define MIN_TEMP	-55	/* min temperature that can be mesured */
++#define MAX_TEMP	125	/* max temperature that can be mesured */
++
+ /* Helpers Macros */
+ 
+ /*
+@@ -96,6 +99,7 @@ module_param_named(strong_pullup, w1_str
+  * @get_conversion_time: pointer to the device conversion time function
+  * @set_resolution: pointer to the device set_resolution function
+  * @get_resolution: pointer to the device get_resolution function
++ * @write_data: pointer to the device writing function (2 or 3 bytes)
+  */
+ struct w1_therm_family_converter {
+ 	u8		broken;
+@@ -105,6 +109,7 @@ struct w1_therm_family_converter {
+ 	int		(*get_conversion_time)(struct w1_slave *sl);
+ 	int		(*set_resolution)(struct w1_slave *sl, int val);
+ 	int		(*get_resolution)(struct w1_slave *sl);
++	int		(*write_data)(struct w1_slave *sl, const u8 *data);
+ };
+ 
+ /**
+@@ -239,6 +244,12 @@ static ssize_t resolution_store(struct d
+ static ssize_t eeprom_store(struct device *device,
+ 	struct device_attribute *attr, const char *buf, size_t size);
+ 
++static ssize_t alarms_store(struct device *device,
++	struct device_attribute *attr, const char *buf, size_t size);
++
++static ssize_t alarms_show(struct device *device,
++	struct device_attribute *attr, char *buf);
++
+ /* Attributes declarations */
+ 
+ static DEVICE_ATTR_RW(w1_slave);
+@@ -247,6 +258,7 @@ static DEVICE_ATTR_RO(temperature);
+ static DEVICE_ATTR_RO(ext_power);
+ static DEVICE_ATTR_RW(resolution);
+ static DEVICE_ATTR_WO(eeprom);
++static DEVICE_ATTR_RW(alarms);
+ 
+ /* Interface Functions declaration */
+ 
+@@ -278,6 +290,7 @@ static struct attribute *w1_therm_attrs[
+ 	&dev_attr_ext_power.attr,
+ 	&dev_attr_resolution.attr,
+ 	&dev_attr_eeprom.attr,
++	&dev_attr_alarms.attr,
+ 	NULL,
+ };
+ 
+@@ -286,6 +299,7 @@ static struct attribute *w1_ds18s20_attr
+ 	&dev_attr_temperature.attr,
+ 	&dev_attr_ext_power.attr,
+ 	&dev_attr_eeprom.attr,
++	&dev_attr_alarms.attr,
+ 	NULL,
+ };
+ 
+@@ -296,6 +310,7 @@ static struct attribute *w1_ds28ea00_att
+ 	&dev_attr_ext_power.attr,
+ 	&dev_attr_resolution.attr,
+ 	&dev_attr_eeprom.attr,
++	&dev_attr_alarms.attr,
+ 	NULL,
+ };
+ 
+@@ -556,6 +571,7 @@ static struct w1_therm_family_converter
+ 		.get_conversion_time	= w1_DS18S20_convert_time,
+ 		.set_resolution		= NULL,	/* no config register */
+ 		.get_resolution		= NULL,	/* no config register */
++		.write_data			= w1_DS18S20_write_data,
+ 	},
+ 	{
+ 		.f				= &w1_therm_family_DS1822,
+@@ -563,6 +579,7 @@ static struct w1_therm_family_converter
+ 		.get_conversion_time	= w1_DS18B20_convert_time,
+ 		.set_resolution		= w1_DS18B20_set_resolution,
+ 		.get_resolution		= w1_DS18B20_get_resolution,
++		.write_data			= w1_DS18B20_write_data,
+ 	},
+ 	{
+ 		.f				= &w1_therm_family_DS18B20,
+@@ -570,6 +587,7 @@ static struct w1_therm_family_converter
+ 		.get_conversion_time	= w1_DS18B20_convert_time,
+ 		.set_resolution		= w1_DS18B20_set_resolution,
+ 		.get_resolution		= w1_DS18B20_get_resolution,
++		.write_data			= w1_DS18B20_write_data,
+ 	},
+ 	{
+ 		.f				= &w1_therm_family_DS28EA00,
+@@ -577,6 +595,7 @@ static struct w1_therm_family_converter
+ 		.get_conversion_time	= w1_DS18B20_convert_time,
+ 		.set_resolution		= w1_DS18B20_set_resolution,
+ 		.get_resolution		= w1_DS18B20_get_resolution,
++		.write_data			= w1_DS18B20_write_data,
+ 	},
+ 	{
+ 		.f				= &w1_therm_family_DS1825,
+@@ -584,6 +603,7 @@ static struct w1_therm_family_converter
+ 		.get_conversion_time	= w1_DS18B20_convert_time,
+ 		.set_resolution		= w1_DS18B20_set_resolution,
+ 		.get_resolution		= w1_DS18B20_get_resolution,
++		.write_data			= w1_DS18B20_write_data,
+ 	}
+ };
+ 
+@@ -678,6 +698,26 @@ static inline int temperature_from_RAM(s
+ 	return 0;  /* No device family */
+ }
+ 
++/**
++ * int_to_short() - Safe casting of int to short
++ *
++ * @i: integer to be converted to short
++ *
++ * Device register use 1 byte to store signed integer.
++ * This helper function convert the int in a signed short,
++ * using the min/max values that device can measure as limits.
++ * min/max values are defined by macro.
++ *
++ * Return: a short in the range of min/max value
++ */
++static inline s8 int_to_short(int i)
++{
++	/* Prepare to cast to short by eliminating out of range values */
++	i = i > MAX_TEMP ? MAX_TEMP : i;
++	i = i < MIN_TEMP ? MIN_TEMP : i;
++	return (s8) i;
++}
++
+ /* Interface Functions */
+ 
+ static int w1_therm_add_slave(struct w1_slave *sl)
+@@ -1250,6 +1290,127 @@ static ssize_t eeprom_store(struct devic
+ 
+ 	return size;
+ }
++
++static ssize_t alarms_show(struct device *device,
++	struct device_attribute *attr, char *buf)
++{
++	struct w1_slave *sl = dev_to_w1_slave(device);
++	int ret = -ENODEV;
++	s8 th = 0, tl = 0;
++	struct therm_info scratchpad;
++
++	ret = read_scratchpad(sl, &scratchpad);
++
++	if (!ret)	{
++		th = scratchpad.rom[2]; /* TH is byte 2 */
++		tl = scratchpad.rom[3]; /* TL is byte 3 */
++	} else {
++		dev_info(device,
++			"%s: error reading alarms register %d\n",
++			__func__, ret);
++	}
++
++	return sprintf(buf, "%hd %hd\n", tl, th);
++}
++
++static ssize_t alarms_store(struct device *device,
++	struct device_attribute *attr, const char *buf, size_t size)
++{
++	struct w1_slave *sl = dev_to_w1_slave(device);
++	struct therm_info info;
++	u8 new_config_register[3];	/* array of data to be written */
++	int temp, ret = -EINVAL;
++	char *token = NULL;
++	s8 tl, th, tt;	/* 1 byte per value + temp ring order */
++	char *p_args = kmalloc(size, GFP_KERNEL);
++
++	/* Safe string copys as buf is const */
++	if (!p_args) {
++		dev_warn(device,
++			"%s: error unable to allocate memory %d\n",
++			__func__, -ENOMEM);
++		return size;
++	}
++	strcpy(p_args, buf);
++
++	/* Split string using space char */
++	token = strsep(&p_args, " ");
++
++	if (!token)	{
++		dev_info(device,
++			"%s: error parsing args %d\n", __func__, -EINVAL);
++		goto free_m;
++	}
++
++	/* Convert 1st entry to int */
++	ret = kstrtoint (token, 10, &temp);
++	if (ret) {
++		dev_info(device,
++			"%s: error parsing args %d\n", __func__, ret);
++		goto free_m;
++	}
++
++	tl = int_to_short(temp);
++
++	/* Split string using space char */
++	token = strsep(&p_args, " ");
++	if (!token)	{
++		dev_info(device,
++			"%s: error parsing args %d\n", __func__, -EINVAL);
++		goto free_m;
++	}
++	/* Convert 2nd entry to int */
++	ret = kstrtoint (token, 10, &temp);
++	if (ret) {
++		dev_info(device,
++			"%s: error parsing args %d\n", __func__, ret);
++		goto free_m;
++	}
++
++	/* Prepare to cast to short by eliminating out of range values */
++	th = int_to_short(temp);
++
++	/* Reorder if required th and tl */
++	if (tl > th) {
++		tt = tl; tl = th; th = tt;
++	}
++
++	/*
++	 * Read the scratchpad to change only the required bits
++	 * (th : byte 2 - tl: byte 3)
++	 */
++	ret = read_scratchpad(sl, &info);
++	if (!ret) {
++		new_config_register[0] = th;	/* Byte 2 */
++		new_config_register[1] = tl;	/* Byte 3 */
++		new_config_register[2] = info.rom[4];/* Byte 4 */
++	} else {
++		dev_info(device,
++			"%s: error reading from the slave device %d\n",
++			__func__, ret);
++		goto free_m;
++	}
++
++	/* Write data in the device RAM */
++	if (!SLAVE_SPECIFIC_FUNC(sl)) {
++		dev_info(device,
++			"%s: Device not supported by the driver %d\n",
++			__func__, -ENODEV);
++		goto free_m;
++	}
++
++	ret = SLAVE_SPECIFIC_FUNC(sl)->write_data(sl, new_config_register);
++	if (ret)
++		dev_info(device,
++			"%s: error writing to the slave device %d\n",
++			__func__, ret);
++
++free_m:
++	/* free allocated memory */
++	kfree(p_args);
++
++	return size;
++}
+ 
+ #if IS_REACHABLE(CONFIG_HWMON)
+ static int w1_read_temp(struct device *device, u32 attr, int channel,