linux-kernel - [PATCH v1 1/5] reset: Allow devm_reset_control_array

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Message-Id: <20210302112123.24161-2-digetx@gmail.com>
Date:   Tue,  2 Mar 2021 14:21:19 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Paul Fertser <fercerpav@...il.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/5] reset: Allow devm_reset_control_array_get() to get resets in a released state

Allow devm_reset_control_array_get() to get resets in a released state
in order to make it possible to extend reset-API with resource-managed
variants of retrieving resets array in a released state. In particular
this is needed by NVIDIA Tegra drivers.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/reset/core.c  |  8 ++++++--
 include/linux/reset.h | 14 ++++++++------
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index dbf881b586d9..f36de3d3849b 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -985,6 +985,8 @@ EXPORT_SYMBOL_GPL(of_reset_control_array_get);
  * @dev: device that requests the list of reset controls
  * @shared: whether reset controls are shared or not
  * @optional: whether it is optional to get the reset controls
+ * @acquired: only one reset control may be acquired for a given controller
+ *            and ID
  *
  * The reset control array APIs are intended for a list of resets
  * that just have to be asserted or deasserted, without any
@@ -993,7 +995,8 @@ EXPORT_SYMBOL_GPL(of_reset_control_array_get);
  * Returns pointer to allocated reset_control on success or error on failure
  */
 struct reset_control *
-devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
+devm_reset_control_array_get(struct device *dev, bool shared, bool optional,
+			     bool acquired)
 {
 	struct reset_control **ptr, *rstc;
 
@@ -1002,7 +1005,8 @@ devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);
 
-	rstc = of_reset_control_array_get(dev->of_node, shared, optional, true);
+	rstc = of_reset_control_array_get(dev->of_node, shared, optional,
+					  acquired);
 	if (IS_ERR_OR_NULL(rstc)) {
 		devres_free(ptr);
 		return rstc;
diff --git a/include/linux/reset.h b/include/linux/reset.h
index b9109efa2a5c..3bee086f1f06 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -33,7 +33,8 @@ struct reset_control *__devm_reset_control_get(struct device *dev,
 				     bool optional, bool acquired);
 
 struct reset_control *devm_reset_control_array_get(struct device *dev,
-						   bool shared, bool optional);
+						   bool shared, bool optional,
+						   bool acquired);
 struct reset_control *of_reset_control_array_get(struct device_node *np,
 						 bool shared, bool optional,
 						 bool acquired);
@@ -105,7 +106,8 @@ static inline struct reset_control *__devm_reset_control_get(
 }
 
 static inline struct reset_control *
-devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
+devm_reset_control_array_get(struct device *dev, bool shared, bool optional,
+			     bool acquired)
 {
 	return optional ? NULL : ERR_PTR(-ENOTSUPP);
 }
@@ -511,25 +513,25 @@ static inline struct reset_control *devm_reset_control_get_by_index(
 static inline struct reset_control *
 devm_reset_control_array_get_exclusive(struct device *dev)
 {
-	return devm_reset_control_array_get(dev, false, false);
+	return devm_reset_control_array_get(dev, false, false, true);
 }
 
 static inline struct reset_control *
 devm_reset_control_array_get_shared(struct device *dev)
 {
-	return devm_reset_control_array_get(dev, true, false);
+	return devm_reset_control_array_get(dev, true, false, true);
 }
 
 static inline struct reset_control *
 devm_reset_control_array_get_optional_exclusive(struct device *dev)
 {
-	return devm_reset_control_array_get(dev, false, true);
+	return devm_reset_control_array_get(dev, false, true, true);
 }
 
 static inline struct reset_control *
 devm_reset_control_array_get_optional_shared(struct device *dev)
 {
-	return devm_reset_control_array_get(dev, true, true);
+	return devm_reset_control_array_get(dev, true, true, true);
 }
 
 static inline struct reset_control *
-- 
2.29.2