[PATCH] ACPI: Introduce has_acpi_companion()

[PATCH] ACPI: Introduce has_acpi_companion()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Now that the ACPI companions of devices are represented by pointers
to struct fwnode_handle, it is not quite efficient to check whether
or not an ACPI companion of a device is present by evaluating the
ACPI_COMPANION() macro.

For this reason, introduce a special static inline routine for that,
has_acpi_companion(), and update the code to use it where applicable.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

On top of https://patchwork.kernel.org/patch/6010351/

---
 drivers/acpi/glue.c                         |    4 ++--
 drivers/i2c/busses/i2c-designware-platdrv.c |    4 ++--
 drivers/iommu/intel-iommu.c                 |    2 +-
 include/linux/acpi.h                        |   10 ++++++++++
 4 files changed, 15 insertions(+), 5 deletions(-)

Index: linux-pm/include/linux/acpi.h
===================================================================
--- linux-pm.orig/include/linux/acpi.h
+++ linux-pm/include/linux/acpi.h
@@ -58,6 +58,11 @@ static inline acpi_handle acpi_device_ha
 	acpi_fwnode_handle(adev) : NULL
 #define ACPI_HANDLE(dev)		acpi_device_handle(ACPI_COMPANION(dev))
 
+static inline bool has_acpi_companion(struct device *dev)
+{
+	return is_acpi_node(dev->fwnode);
+}
+
 static inline void acpi_preset_companion(struct device *dev,
 					 struct acpi_device *parent, u64 addr)
 {
@@ -472,6 +477,11 @@ static inline struct fwnode_handle *acpi
 	return NULL;
 }
 
+static inline bool has_acpi_companion(struct device *dev)
+{
+	return false;
+}
+
 static inline const char *acpi_dev_name(struct acpi_device *adev)
 {
 	return NULL;
Index: linux-pm/drivers/i2c/busses/i2c-designware-platdrv.c
===================================================================
--- linux-pm.orig/drivers/i2c/busses/i2c-designware-platdrv.c
+++ linux-pm/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -166,7 +166,7 @@ static int dw_i2c_probe(struct platform_
 	/* fast mode by default because of legacy reasons */
 	clk_freq = 400000;
 
-	if (ACPI_COMPANION(&pdev->dev)) {
+	if (has_acpi_companion(&pdev->dev)) {
 		dw_i2c_acpi_configure(pdev);
 	} else if (pdev->dev.of_node) {
 		of_property_read_u32(pdev->dev.of_node,
@@ -286,7 +286,7 @@ static int dw_i2c_remove(struct platform
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 
-	if (ACPI_COMPANION(&pdev->dev))
+	if (has_acpi_companion(&pdev->dev))
 		dw_i2c_acpi_unconfigure(pdev);
 
 	return 0;
Index: linux-pm/drivers/iommu/intel-iommu.c
===================================================================
--- linux-pm.orig/drivers/iommu/intel-iommu.c
+++ linux-pm/drivers/iommu/intel-iommu.c
@@ -684,7 +684,7 @@ static struct intel_iommu *device_to_iom
 	if (dev_is_pci(dev)) {
 		pdev = to_pci_dev(dev);
 		segment = pci_domain_nr(pdev->bus);
-	} else if (ACPI_COMPANION(dev))
+	} else if (has_acpi_companion(dev))
 		dev = &ACPI_COMPANION(dev)->dev;
 
 	rcu_read_lock();
Index: linux-pm/drivers/acpi/glue.c
===================================================================
--- linux-pm.orig/drivers/acpi/glue.c
+++ linux-pm/drivers/acpi/glue.c
@@ -168,7 +168,7 @@ int acpi_bind_one(struct device *dev, st
 	unsigned int node_id;
 	int retval = -EINVAL;
 
-	if (ACPI_COMPANION(dev)) {
+	if (has_acpi_companion(dev)) {
 		if (acpi_dev) {
 			dev_warn(dev, "ACPI companion already set\n");
 			return -EINVAL;
@@ -220,7 +220,7 @@ int acpi_bind_one(struct device *dev, st
 	list_add(&physical_node->node, physnode_list);
 	acpi_dev->physical_node_count++;
 
-	if (!ACPI_COMPANION(dev))
+	if (!has_acpi_companion(dev))
 		ACPI_COMPANION_SET(dev, acpi_dev);
 
 	acpi_physnode_link_name(physical_node_name, node_id);

[PATCH] driver core: Implement device property accessors through fwnode ones

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Now that the ACPI companions of devices are pointed to by the fwnode
field in struct device, the device_property_*() accessor functions
can be modified to use their fwnode_property_*() counterparts
internally with minimum extra overhead in the IS_ENABLED(CONFIG_OF)
case, so make those changes.

This allows us to get rid of the rather ugly DEV_PROP_READ_ARRAY()
macro among other things.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

On top of

http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=ce793486e23e0162a732c605189c8028e0910e86

---
 drivers/base/property.c |   44 +++++++++++++++++---------------------------
 1 file changed, 17 insertions(+), 27 deletions(-)

Index: linux-pm/drivers/base/property.c
===================================================================
--- linux-pm.orig/drivers/base/property.c
+++ linux-pm/drivers/base/property.c
@@ -15,6 +15,12 @@
 #include <linux/acpi.h>
 #include <linux/of.h>
 
+static inline struct fwnode_handle *dev_fwnode(struct device *dev)
+{
+	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
+		&dev->of_node->fwnode : dev->fwnode;
+}
+
 /**
  * device_property_present - check if a property of a device is present
  * @dev: Device whose property is being checked
@@ -24,10 +30,7 @@
  */
 bool device_property_present(struct device *dev, const char *propname)
 {
-	if (IS_ENABLED(CONFIG_OF) && dev->of_node)
-		return of_property_read_bool(dev->of_node, propname);
-
-	return !acpi_dev_prop_get(ACPI_COMPANION(dev), propname, NULL);
+	return fwnode_property_present(dev_fwnode(dev), propname);
 }
 EXPORT_SYMBOL_GPL(device_property_present);
 
@@ -47,17 +50,6 @@ bool fwnode_property_present(struct fwno
 }
 EXPORT_SYMBOL_GPL(fwnode_property_present);
 
-#define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
-	(val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
-	      : of_property_count_elems_of_size((node), (propname), sizeof(type))
-
-#define DEV_PROP_READ_ARRAY(_dev_, _propname_, _type_, _proptype_, _val_, _nval_) \
-	IS_ENABLED(CONFIG_OF) && _dev_->of_node ? \
-		(OF_DEV_PROP_READ_ARRAY(_dev_->of_node, _propname_, _type_, \
-					_val_, _nval_)) : \
-		acpi_dev_prop_read(ACPI_COMPANION(_dev_), _propname_, \
-				   _proptype_, _val_, _nval_)
-
 /**
  * device_property_read_u8_array - return a u8 array property of a device
  * @dev: Device to get the property of
@@ -77,7 +69,7 @@ EXPORT_SYMBOL_GPL(fwnode_property_presen
 int device_property_read_u8_array(struct device *dev, const char *propname,
 				  u8 *val, size_t nval)
 {
-	return DEV_PROP_READ_ARRAY(dev, propname, u8, DEV_PROP_U8, val, nval);
+	return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u8_array);
 
@@ -100,7 +92,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u
 int device_property_read_u16_array(struct device *dev, const char *propname,
 				   u16 *val, size_t nval)
 {
-	return DEV_PROP_READ_ARRAY(dev, propname, u16, DEV_PROP_U16, val, nval);
+	return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u16_array);
 
@@ -123,7 +115,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u
 int device_property_read_u32_array(struct device *dev, const char *propname,
 				   u32 *val, size_t nval)
 {
-	return DEV_PROP_READ_ARRAY(dev, propname, u32, DEV_PROP_U32, val, nval);
+	return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u32_array);
 
@@ -146,7 +138,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u
 int device_property_read_u64_array(struct device *dev, const char *propname,
 				   u64 *val, size_t nval)
 {
-	return DEV_PROP_READ_ARRAY(dev, propname, u64, DEV_PROP_U64, val, nval);
+	return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_u64_array);
 
@@ -169,10 +161,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u
 int device_property_read_string_array(struct device *dev, const char *propname,
 				      const char **val, size_t nval)
 {
-	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
-		of_property_read_string_array(dev->of_node, propname, val, nval) :
-		acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
-				   DEV_PROP_STRING, val, nval);
+	return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
 }
 EXPORT_SYMBOL_GPL(device_property_read_string_array);
 
@@ -193,13 +182,14 @@ EXPORT_SYMBOL_GPL(device_property_read_s
 int device_property_read_string(struct device *dev, const char *propname,
 				const char **val)
 {
-	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
-		of_property_read_string(dev->of_node, propname, val) :
-		acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
-				   DEV_PROP_STRING, val, 1);
+	return fwnode_property_read_string(dev_fwnode(dev), propname, val);
 }
 EXPORT_SYMBOL_GPL(device_property_read_string);
 
+#define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \
+	(val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \
+	      : of_property_count_elems_of_size((node), (propname), sizeof(type))
+
 #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \
 ({ \
 	int _ret_; \

Re: [PATCH] driver core: Implement device property accessors through fwnode ones

[Greg Kroah-Hartman]

On Mon, Mar 23, 2015 at 12:10:30AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Now that the ACPI companions of devices are pointed to by the fwnode
> field in struct device, the device_property_*() accessor functions
> can be modified to use their fwnode_property_*() counterparts
> internally with minimum extra overhead in the IS_ENABLED(CONFIG_OF)
> case, so make those changes.
> 
> This allows us to get rid of the rather ugly DEV_PROP_READ_ARRAY()
> macro among other things.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
> 
> On top of
> 
> http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=ce793486e23e0162a732c605189c8028e0910e86

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>