linux-kernel - [PATCH] Documentation/IRQ-domain.txt: Document irq_domain_create

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Message-Id: <1458997642-4241-1-git-send-email-nasa4836@gmail.com>
Date:	Sat, 26 Mar 2016 21:07:22 +0800
From:	Jianyu Zhan <nasa4836@...il.com>
To:	jiang.liu@...ux.intel.com, marc.zyngier@....com, corbet@....net,
	grant.likely@...retlab.ca, rdunlap@...radead.org
Cc:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jianyu Zhan <nasa4836@...il.com>
Subject: [PATCH] Documentation/IRQ-domain.txt: Document irq_domain_create_{linear, tree}

They have the same functionalities as irq_domain_add_{linear, tree},
except fro accepting different first argument.

Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
---
 Documentation/IRQ-domain.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/IRQ-domain.txt b/Documentation/IRQ-domain.txt
index 8d990bd..89dda22 100644
--- a/Documentation/IRQ-domain.txt
+++ b/Documentation/IRQ-domain.txt
@@ -70,6 +70,7 @@ of the reverse map types are described below:
 
 ==== Linear ====
 irq_domain_add_linear()
+irq_domain_create_linear()
 
 The linear reverse map maintains a fixed size table indexed by the
 hwirq number.  When a hwirq is mapped, an irq_desc is allocated for
@@ -81,10 +82,16 @@ map are fixed time lookup for IRQ numbers, and irq_descs are only
 allocated for in-use IRQs.  The disadvantage is that the table must be
 as large as the largest possible hwirq number.
 
+irq_domain_add_linear() and irq_domain_create_linear() are functionally
+equivalent, except for the first argument is different - the former
+accepts an Open Firmware specific 'struct device_node', while the latter
+accepts a more general abstration 'struct fwnode_handle'.
+
 The majority of drivers should use the linear map.
 
 ==== Tree ====
 irq_domain_add_tree()
+irq_domain_create_tree()
 
 The irq_domain maintains a radix tree map from hwirq numbers to Linux
 IRQs.  When an hwirq is mapped, an irq_desc is allocated and the
@@ -95,6 +102,11 @@ since it doesn't need to allocate a table as large as the largest
 hwirq number.  The disadvantage is that hwirq to IRQ number lookup is
 dependent on how many entries are in the table.
 
+irq_domain_add_tree() and irq_domain_create_tree() are functionally
+equivalent, except for the first argument is different - the former
+accepts an Open Firmware specific 'struct device_node', while the latter
+accepts a more general abstration 'struct fwnode_handle'.
+
 Very few drivers should need this mapping.
 
 ==== No Map ===-
-- 
2.4.3