Merge tag 'hwlock-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

Pull hwspinlock updates from Bjorn Andersson:
 "This contains a number of cleanups to the core and several drivers, in
  particular removing the requirement for drivers to implement
  pm_runtime.

  It also udpates the location of the git tree in MAINTAINERS"

* tag 'hwlock-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc:
  hwspinlock: u8500_hsem: Remove redundant PM runtime implementation
  hwspinlock: sprd: Remove redundant PM runtime implementation
  hwspinlock: Let the PM runtime can be optional
  hwspinlock: Remove BUG_ON() from the hwspinlock core
  hwspinlock: sprd: Use devm_hwspin_lock_register() to register hwlock controller
  hwspinlock: sprd: Use devm_add_action_or_reset() for calls to clk_disable_unprepare()
  hwspinlock: sprd: Check the return value of clk_prepare_enable()
  hwspinlock: sprd: Change to use devm_platform_ioremap_resource()
  hwspinlock: u8500_hsem: Use devm_hwspin_lock_register() to register hwlock controller
  hwspinlock: u8500_hsem: Use devm_kzalloc() to allocate memory
  hwspinlock: u8500_hsem: Change to use devm_platform_ioremap_resource()
  MAINTAINERS: hwspinlock: update git tree location

3 files changed, 41 insertions, 76 deletions

diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 8862445aa858..fd5f5c5a5244 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -92,8 +92,8 @@ int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 {
 	int ret;
 
-	BUG_ON(!hwlock);
-	BUG_ON(!flags && mode == HWLOCK_IRQSTATE);
+	if (WARN_ON(!hwlock || (!flags && mode == HWLOCK_IRQSTATE)))
+		return -EINVAL;
 
 	/*
 	 * This spin_lock{_irq, _irqsave} serves three purposes:
@@ -264,8 +264,8 @@ EXPORT_SYMBOL_GPL(__hwspin_lock_timeout);
  */
 void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 {
-	BUG_ON(!hwlock);
-	BUG_ON(!flags && mode == HWLOCK_IRQSTATE);
+	if (WARN_ON(!hwlock || (!flags && mode == HWLOCK_IRQSTATE)))
+		return;
 
 	/*
 	 * We must make sure that memory operations (both reads and writes),
@@ -657,13 +657,15 @@ static int __hwspin_lock_request(struct hwspinlock *hwlock)
 
 	/* notify PM core that power is now needed */
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0) {
+	if (ret < 0 && ret != -EACCES) {
 		dev_err(dev, "%s: can't power on device\n", __func__);
 		pm_runtime_put_noidle(dev);
 		module_put(dev->driver->owner);
 		return ret;
 	}
 
+	ret = 0;
+
 	/* mark hwspinlock as used, should not fail */
 	tmp = radix_tree_tag_clear(&hwspinlock_tree, hwlock_to_id(hwlock),
 							HWSPINLOCK_UNUSED);
@@ -820,9 +822,7 @@ int hwspin_lock_free(struct hwspinlock *hwlock)
 	}
 
 	/* notify the underlying device that power is not needed */
-	ret = pm_runtime_put(dev);
-	if (ret < 0)
-		goto out;
+	pm_runtime_put(dev);
 
 	/* mark this hwspinlock as available */
 	tmp = radix_tree_tag_set(&hwspinlock_tree, hwlock_to_id(hwlock),
diff --git a/drivers/hwspinlock/sprd_hwspinlock.c b/drivers/hwspinlock/sprd_hwspinlock.c
index dc42bf51f3e6..36dc8038bbb4 100644
--- a/drivers/hwspinlock/sprd_hwspinlock.c
+++ b/drivers/hwspinlock/sprd_hwspinlock.c
@@ -15,7 +15,6 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 #include "hwspinlock_internal.h"
@@ -79,11 +78,17 @@ static const struct hwspinlock_ops sprd_hwspinlock_ops = {
 	.relax = sprd_hwspinlock_relax,
 };
 
+static void sprd_hwspinlock_disable(void *data)
+{
+	struct sprd_hwspinlock_dev *sprd_hwlock = data;
+
+	clk_disable_unprepare(sprd_hwlock->clk);
+}
+
 static int sprd_hwspinlock_probe(struct platform_device *pdev)
 {
 	struct sprd_hwspinlock_dev *sprd_hwlock;
 	struct hwspinlock *lock;
-	struct resource *res;
 	int i, ret;
 
 	if (!pdev->dev.of_node)
@@ -96,8 +101,7 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
 	if (!sprd_hwlock)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	sprd_hwlock->base = devm_ioremap_resource(&pdev->dev, res);
+	sprd_hwlock->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(sprd_hwlock->base))
 		return PTR_ERR(sprd_hwlock->base);
 
@@ -107,7 +111,17 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
 		return PTR_ERR(sprd_hwlock->clk);
 	}
 
-	clk_prepare_enable(sprd_hwlock->clk);
+	ret = clk_prepare_enable(sprd_hwlock->clk);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&pdev->dev, sprd_hwspinlock_disable,
+				       sprd_hwlock);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Failed to add hwspinlock disable action\n");
+		return ret;
+	}
 
 	/* set the hwspinlock to record user id to identify subsystems */
 	writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);
@@ -118,27 +132,10 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, sprd_hwlock);
-	pm_runtime_enable(&pdev->dev);
 
-	ret = hwspin_lock_register(&sprd_hwlock->bank, &pdev->dev,
-				   &sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM);
-	if (ret) {
-		pm_runtime_disable(&pdev->dev);
-		clk_disable_unprepare(sprd_hwlock->clk);
-		return ret;
-	}
-
-	return 0;
-}
-
-static int sprd_hwspinlock_remove(struct platform_device *pdev)
-{
-	struct sprd_hwspinlock_dev *sprd_hwlock = platform_get_drvdata(pdev);
-
-	hwspin_lock_unregister(&sprd_hwlock->bank);
-	pm_runtime_disable(&pdev->dev);
-	clk_disable_unprepare(sprd_hwlock->clk);
-	return 0;
+	return devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank,
+					 &sprd_hwspinlock_ops, 0,
+					 SPRD_HWLOCKS_NUM);
 }
 
 static const struct of_device_id sprd_hwspinlock_of_match[] = {
@@ -149,7 +146,6 @@ MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);
 
 static struct platform_driver sprd_hwspinlock_driver = {
 	.probe = sprd_hwspinlock_probe,
-	.remove = sprd_hwspinlock_remove,
 	.driver = {
 		.name = "sprd_hwspinlock",
 		.of_match_table = of_match_ptr(sprd_hwspinlock_of_match),
diff --git a/drivers/hwspinlock/u8500_hsem.c b/drivers/hwspinlock/u8500_hsem.c
index 572ca79d77e8..67845c0c9701 100644
--- a/drivers/hwspinlock/u8500_hsem.c
+++ b/drivers/hwspinlock/u8500_hsem.c
@@ -16,7 +16,6 @@
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/io.h>
-#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/hwspinlock.h>
@@ -88,21 +87,16 @@ static int u8500_hsem_probe(struct platform_device *pdev)
 	struct hwspinlock_pdata *pdata = pdev->dev.platform_data;
 	struct hwspinlock_device *bank;
 	struct hwspinlock *hwlock;
-	struct resource *res;
 	void __iomem *io_base;
-	int i, ret, num_locks = U8500_MAX_SEMAPHORE;
+	int i, num_locks = U8500_MAX_SEMAPHORE;
 	ulong val;
 
 	if (!pdata)
 		return -ENODEV;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
-	io_base = ioremap(res->start, resource_size(res));
-	if (!io_base)
-		return -ENOMEM;
+	io_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(io_base))
+		return PTR_ERR(io_base);
 
 	/* make sure protocol 1 is selected */
 	val = readl(io_base + HSEM_CTRL_REG);
@@ -111,54 +105,29 @@ static int u8500_hsem_probe(struct platform_device *pdev)
 	/* clear all interrupts */
 	writel(0xFFFF, io_base + HSEM_ICRALL);
 
-	bank = kzalloc(struct_size(bank, lock, num_locks), GFP_KERNEL);
-	if (!bank) {
-		ret = -ENOMEM;
-		goto iounmap_base;
-	}
+	bank = devm_kzalloc(&pdev->dev, struct_size(bank, lock, num_locks),
+			    GFP_KERNEL);
+	if (!bank)
+		return -ENOMEM;
 
 	platform_set_drvdata(pdev, bank);
 
 	for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++)
 		hwlock->priv = io_base + HSEM_REGISTER_OFFSET + sizeof(u32) * i;
 
-	/* no pm needed for HSem but required to comply with hwspilock core */
-	pm_runtime_enable(&pdev->dev);
-
-	ret = hwspin_lock_register(bank, &pdev->dev, &u8500_hwspinlock_ops,
-						pdata->base_id, num_locks);
-	if (ret)
-		goto reg_fail;
-
-	return 0;
-
-reg_fail:
-	pm_runtime_disable(&pdev->dev);
-	kfree(bank);
-iounmap_base:
-	iounmap(io_base);
-	return ret;
+	return devm_hwspin_lock_register(&pdev->dev, bank,
+					 &u8500_hwspinlock_ops,
+					 pdata->base_id, num_locks);
 }
 
 static int u8500_hsem_remove(struct platform_device *pdev)
 {
 	struct hwspinlock_device *bank = platform_get_drvdata(pdev);
 	void __iomem *io_base = bank->lock[0].priv - HSEM_REGISTER_OFFSET;
-	int ret;
 
 	/* clear all interrupts */
 	writel(0xFFFF, io_base + HSEM_ICRALL);
 
-	ret = hwspin_lock_unregister(bank);
-	if (ret) {
-		dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
-		return ret;
-	}
-
-	pm_runtime_disable(&pdev->dev);
-	iounmap(io_base);
-	kfree(bank);
-
 	return 0;
 }