Message-ID: <1477498834-30425-11-git-send-email-stuart.yoder@nxp.com>
Date:   Wed, 26 Oct 2016 11:20:32 -0500
From:   Stuart Yoder <stuart.yoder@....com>
To:     <gregkh@...uxfoundation.org>
CC:     <german.rivera@....com>, <devel@...verdev.osuosl.org>,
        <linux-kernel@...r.kernel.org>, <agraf@...e.de>, <arnd@...db.de>,
        <leoyang.li@....com>, <ioana.ciornei@....com>,
        <catalin.horghidan@....com>, Stuart Yoder <stuart.yoder@....com>
Subject: [PATCH v2 10/12] staging: fsl-mc: improve wording in comments

improve and clarify miscellaneous comments in the bus driver
and allocator

Signed-off-by: Stuart Yoder <stuart.yoder@....com>
---
-v2
   -update/improve commit message

 drivers/staging/fsl-mc/bus/fsl-mc-allocator.c | 68 +++++++++++++--------------
 drivers/staging/fsl-mc/bus/fsl-mc-bus.c       | 18 +++----
 2 files changed, 42 insertions(+), 44 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
index e92c780..4a7ac97 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
@@ -1,5 +1,5 @@
 /*
- * Freescale MC object device allocator driver
+ * fsl-mc object allocator driver
  *
  * Copyright (C) 2013 Freescale Semiconductor, Inc.
  *
@@ -23,15 +23,12 @@
 	 strcmp(_obj_type, "dpcon") == 0)
 
 /**
- * fsl_mc_resource_pool_add_device - add allocatable device to a resource
- * pool of a given MC bus
+ * fsl_mc_resource_pool_add_device - add allocatable object to a resource
+ * pool of a given fsl-mc bus
  *
- * @mc_bus: pointer to the MC bus
- * @pool_type: MC bus pool type
- * @mc_dev: Pointer to allocatable MC object device
- *
- * It adds an allocatable MC object device to a container's resource pool of
- * the given resource type
+ * @mc_bus: pointer to the fsl-mc bus
+ * @pool_type: pool type
+ * @mc_dev: pointer to allocatable fsl-mc device
  */
 static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus
 								*mc_bus,
@@ -95,10 +92,10 @@ static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus
  * fsl_mc_resource_pool_remove_device - remove an allocatable device from a
  * resource pool
  *
- * @mc_dev: Pointer to allocatable MC object device
+ * @mc_dev: pointer to allocatable fsl-mc device
  *
- * It permanently removes an allocatable MC object device from the resource
- * pool, the device is currently in, as long as it is in the pool's free list.
+ * It permanently removes an allocatable fsl-mc device from the resource
+ * pool. It's an error if the device is in use.
  */
 static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device
 								   *mc_dev)
@@ -255,17 +252,18 @@ void fsl_mc_resource_free(struct fsl_mc_resource *resource)
 EXPORT_SYMBOL_GPL(fsl_mc_resource_free);
 
 /**
- * fsl_mc_object_allocate - Allocates a MC object device of the given
- * pool type from a given MC bus
+ * fsl_mc_object_allocate - Allocates an fsl-mc object of the given
+ * pool type from a given fsl-mc bus instance
  *
- * @mc_dev: MC device for which the MC object device is to be allocated
- * @pool_type: MC bus resource pool type
- * @new_mc_dev: Pointer to area where the pointer to the allocated
- * MC object device is to be returned
+ * @mc_dev: fsl-mc device which is used in conjunction with the
+ * allocated object
+ * @pool_type: pool type
+ * @new_mc_dev: pointer to area where the pointer to the allocated device
+ * is to be returned
  *
- * This function allocates a MC object device from the device's parent DPRC,
- * from the corresponding MC bus' pool of allocatable MC object devices of
- * the given resource type. mc_dev cannot be a DPRC itself.
+ * Allocatable objects are always used in conjunction with some functional
+ * device.  This function allocates an object of the specified type from
+ * the DPRC containing the functional device.
  *
  * NOTE: pool_type must be different from FSL_MC_POOL_MCP, since MC
  * portals are allocated using fsl_mc_portal_allocate(), instead of
@@ -312,10 +310,9 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
 EXPORT_SYMBOL_GPL(fsl_mc_object_allocate);
 
 /**
- * fsl_mc_object_free - Returns an allocatable MC object device to the
- * corresponding resource pool of a given MC bus.
- *
- * @mc_adev: Pointer to the MC object device
+ * fsl_mc_object_free - Returns an fsl-mc object to the resource
+ * pool where it came from.
+ * @mc_adev: Pointer to the fsl-mc device
  */
 void fsl_mc_object_free(struct fsl_mc_device *mc_adev)
 {
@@ -332,8 +329,14 @@ void fsl_mc_object_free(struct fsl_mc_device *mc_adev)
 EXPORT_SYMBOL_GPL(fsl_mc_object_free);
 
 /*
- * Initialize the interrupt pool associated with a MC bus.
- * It allocates a block of IRQs from the GIC-ITS
+ * A DPRC and the devices in the DPRC all share the same GIC-ITS device
+ * ID.  A block of IRQs is pre-allocated and maintained in a pool
+ * from which devices can allocate them when needed.
+ */
+
+/*
+ * Initialize the interrupt pool associated with an fsl-mc bus.
+ * It allocates a block of IRQs from the GIC-ITS.
  */
 int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
 			     unsigned int irq_count)
@@ -395,7 +398,7 @@ int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
 EXPORT_SYMBOL_GPL(fsl_mc_populate_irq_pool);
 
 /**
- * Teardown the interrupt pool associated with an MC bus.
+ * Teardown the interrupt pool associated with an fsl-mc bus.
  * It frees the IRQs that were allocated to the pool, back to the GIC-ITS.
  */
 void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
@@ -422,11 +425,7 @@ void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
 EXPORT_SYMBOL_GPL(fsl_mc_cleanup_irq_pool);
 
 /**
- * It allocates the IRQs required by a given MC object device. The
- * IRQs are allocated from the interrupt pool associated with the
- * MC bus that contains the device, if the device is not a DPRC device.
- * Otherwise, the IRQs are allocated from the interrupt pool associated
- * with the MC bus that represents the DPRC device itself.
+ * Allocate the IRQs required by a given fsl-mc device.
  */
 int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
 {
@@ -495,8 +494,7 @@ int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
 EXPORT_SYMBOL_GPL(fsl_mc_allocate_irqs);
 
 /*
- * It frees the IRQs that were allocated for a MC object device, by
- * returning them to the corresponding interrupt pool.
+ * Frees the IRQs that were allocated for an fsl-mc device.
  */
 void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
 {
diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-bus.c b/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
index fb062d3..6f148b2 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-bus.c
@@ -36,7 +36,7 @@
 
 /**
  * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
- * @root_mc_bus_dev: MC object device representing the root DPRC
+ * @root_mc_bus_dev: fsl-mc device representing the root DPRC
  * @num_translation_ranges: number of entries in addr_translation_ranges
  * @translation_ranges: array of bus to system address translation ranges
  */
@@ -64,8 +64,8 @@ struct fsl_mc_addr_translation_range {
 
 /**
  * fsl_mc_bus_match - device to driver matching callback
- * @dev: the MC object device structure to match against
- * @drv: the device driver to search for matching MC object device id
+ * @dev: the fsl-mc device to match against
+ * @drv: the device driver to search for matching fsl-mc object type
  * structures
  *
  * Returns 1 on success, 0 otherwise.
@@ -93,7 +93,7 @@ static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
 
 	/*
 	 * Traverse the match_id table of the given driver, trying to find
-	 * a matching for the given MC object device.
+	 * a matching for the given device.
 	 */
 	for (id = mc_drv->match_id_table; id->vendor != 0x0; id++) {
 		if (id->vendor == mc_dev->obj_desc.vendor &&
@@ -450,7 +450,7 @@ bool fsl_mc_is_root_dprc(struct device *dev)
 }
 
 /**
- * Add a newly discovered MC object device to be visible in Linux
+ * Add a newly discovered fsl-mc device to be visible in Linux
  */
 int fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
 		      struct fsl_mc_io *mc_io,
@@ -531,8 +531,8 @@ int fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
 			goto error_cleanup_dev;
 	} else {
 		/*
-		 * A non-DPRC MC object device has to be a child of another
-		 * MC object (specifically a DPRC object)
+		 * A non-DPRC object has to be a child of a DPRC, use the
+		 * parent's ICID and interrupt domain.
 		 */
 		mc_dev->icid = parent_mc_dev->icid;
 		mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
@@ -587,10 +587,10 @@ int fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
 EXPORT_SYMBOL_GPL(fsl_mc_device_add);
 
 /**
- * fsl_mc_device_remove - Remove a MC object device from being visible to
+ * fsl_mc_device_remove - Remove an fsl-mc device from being visible to
  * Linux
  *
- * @mc_dev: Pointer to a MC object device object
+ * @mc_dev: Pointer to an fsl-mc device
  */
 void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
 {
-- 
1.9.0

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