提交 118aee4d 编写于 作者: M Magnus Damm 提交者: Simon Horman

clocksource: sh_cmt: Add CMT register layout comment

Add a comment about different register layouts
supported by the CMT driver.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Acked-by: NJohn Stultz <john.stultz@linaro.org>
Tested-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
上级 cccd7045
......@@ -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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