at91: add kernel support for sama7g5 soc

Add kernel support for SAMA7G5 by back-porting mainline kernel patches.
Among SAMA7G5 features could be remembered:
- ARM Cortex-A7
- double data rate multi-port dynamic RAM controller supporting DDR2,
  DDR3, DDR3L, LPDDR2, LPDDR3 up to 533MHz
- peripherals for audio, video processing
- 1 gigabit + 1 megabit Ethernet controllers
- 6 CAN controllers
- trust zone support
- DVFS for CPU
- criptography IPs

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/at91/patches-5.10/127-regulator-core-validate-selector-against-linear_min_.patch b/target/linux/at91/patches-5.10/127-regulator-core-validate-selector-against-linear_min_.patch
new file mode 100644
index 0000000000..88302fda04
--- /dev/null
+++ b/target/linux/at91/patches-5.10/127-regulator-core-validate-selector-against-linear_min_.patch
@@ -0,0 +1,71 @@
+From 3aee4f22ed0a22d3d6d22fc49812c03d876c7637 Mon Sep 17 00:00:00 2001
+From: Claudiu Beznea <claudiu.beznea@microchip.com>
+Date: Fri, 13 Nov 2020 17:21:05 +0200
+Subject: [PATCH 127/247] regulator: core: validate selector against
+ linear_min_sel
+
+There are regulators who's min selector is not zero. Selectors loops
+(looping b/w zero and regulator::desc::n_voltages) might throw errors
+because invalid selectors are used (lower than
+regulator::desc::linear_min_sel). For this situations validate selectors
+against regulator::desc::linear_min_sel.
+
+Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
+Link: https://lore.kernel.org/r/1605280870-32432-2-git-send-email-claudiu.beznea@microchip.com
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ drivers/regulator/core.c    | 9 +++++++--
+ drivers/regulator/helpers.c | 3 ++-
+ 2 files changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
+index 043b5f63b94a..dfdd42b9d773 100644
+--- a/drivers/regulator/core.c
++++ b/drivers/regulator/core.c
+@@ -2984,7 +2984,8 @@ static int _regulator_list_voltage(struct regulator_dev *rdev,
+ 		return rdev->desc->fixed_uV;
+ 
+ 	if (ops->list_voltage) {
+-		if (selector >= rdev->desc->n_voltages)
++		if (selector >= rdev->desc->n_voltages ||
++		    selector < rdev->desc->linear_min_sel)
+ 			return -EINVAL;
+ 		if (lock)
+ 			regulator_lock(rdev);
+@@ -3135,7 +3136,8 @@ int regulator_list_hardware_vsel(struct regulator *regulator,
+ 	struct regulator_dev *rdev = regulator->rdev;
+ 	const struct regulator_ops *ops = rdev->desc->ops;
+ 
+-	if (selector >= rdev->desc->n_voltages)
++	if (selector >= rdev->desc->n_voltages ||
++	    selector < rdev->desc->linear_min_sel)
+ 		return -EINVAL;
+ 	if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
+ 		return -EOPNOTSUPP;
+@@ -4058,6 +4060,9 @@ int regulator_set_voltage_time(struct regulator *regulator,
+ 
+ 	for (i = 0; i < rdev->desc->n_voltages; i++) {
+ 		/* We only look for exact voltage matches here */
++		if (i < rdev->desc->linear_min_sel)
++			continue;
++
+ 		voltage = regulator_list_voltage(regulator, i);
+ 		if (voltage < 0)
+ 			return -EINVAL;
+diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
+index e4bb09bbd3fa..974f1a63993d 100644
+--- a/drivers/regulator/helpers.c
++++ b/drivers/regulator/helpers.c
+@@ -647,7 +647,8 @@ int regulator_list_voltage_table(struct regulator_dev *rdev,
+ 		return -EINVAL;
+ 	}
+ 
+-	if (selector >= rdev->desc->n_voltages)
++	if (selector >= rdev->desc->n_voltages ||
++	    selector < rdev->desc->linear_min_sel)
+ 		return -EINVAL;
+ 
+ 	return rdev->desc->volt_table[selector];
+-- 
+2.32.0
+