linux-kernel - [PATCH 08/08] clocksource: sh_cmt: Add CMT register layout comment

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Date:	Fri, 14 Dec 2012 14:54:37 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-sh@...r.kernel.org, johnstul@...ibm.com, horms@...ge.net.au,
	shinya.kuribayashi.px@...esas.com,
	Magnus Damm <magnus.damm@...il.com>, tglx@...utronix.de
Subject: [PATCH 08/08] clocksource: sh_cmt: Add CMT register layout comment

From: Magnus Damm <damm@...nsource.se>

Add a comment about different register layouts
supported by the CMT driver.

Signed-off-by: Magnus Damm <damm@...nsource.se>
---

 drivers/clocksource/sh_cmt.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- 0005/drivers/clocksource/sh_cmt.c
+++ work/drivers/clocksource/sh_cmt.c	2012-12-14 11:43:10.000000000 +0900
@@ -66,6 +66,21 @@ struct sh_cmt_priv {
 			    unsigned long value);
 };
 
+/* Examples of supported CMT timer register layouts and I/O access widths:
+ *
+ * "16-bit counter and 16-bit control" as found on sh7263:
+ * CMSTR 0xfffec000 16-bit
+ * CMCSR 0xfffec002 16-bit
+ * CMCNT 0xfffec004 16-bit
+ * CMCOR 0xfffec006 16-bit
+ *
+ * "32-bit counter and 16-bit control" as found on sh7372, sh73a0, r8a7740:
+ * CMSTR 0xffca0000 16-bit
+ * CMCSR 0xffca0060 16-bit
+ * CMCNT 0xffca0064 32-bit
+ * CMCOR 0xffca0068 32-bit
+ */
+
 static unsigned long sh_cmt_read16(void __iomem *base, unsigned long offs)
 {
 	return ioread16(base + (offs << 1));
--
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