regulator: core: Parse coupled regulators properties
On Odroid XU3/4 and other Exynos5422 based boards there is a case, that
different devices on the board are supplied by different regulators
with non-fixed voltages. If one of these devices temporarily requires
higher voltage, there might occur a situation that the spread between
devices' voltages is so high, that there is a risk of changing
'high' and 'low' states on the interconnection between devices powered
by those regulators.
Add new structure "coupling_desc" to regulator_dev, which contains
pointers to all coupled regulators including the owner of the structure,
number of coupled regulators and counter of currently resolved
regulators.
Add of_functions to parse all data needed in regulator coupling.
Provide method to check DTS data consistency. Check if each coupled
regulator's max_spread is equal and if their lists of regulators match.
Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index c2a181f..fc2dc8d 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -15,6 +15,8 @@
#ifndef __LINUX_REGULATOR_DRIVER_H_
#define __LINUX_REGULATOR_DRIVER_H_
+#define MAX_COUPLED 4
+
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/regulator/consumer.h>
@@ -410,6 +412,20 @@ struct regulator_config {
};
/*
+ * struct coupling_desc
+ *
+ * Describes coupling of regulators. Each regulator should have
+ * at least a pointer to itself in coupled_rdevs array.
+ * When a new coupled regulator is resolved, n_resolved is
+ * incremented.
+ */
+struct coupling_desc {
+ struct regulator_dev *coupled_rdevs[MAX_COUPLED];
+ int n_resolved;
+ int n_coupled;
+};
+
+/*
* struct regulator_dev
*
* Voltage / Current regulator class device. One for each
@@ -432,6 +448,8 @@ struct regulator_dev {
/* lists we own */
struct list_head consumer_list; /* consumers we supply */
+ struct coupling_desc coupling_desc;
+
struct blocking_notifier_head notifier;
struct mutex mutex; /* consumer lock */
struct task_struct *mutex_owner;