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clk: at91: utmi: set the mainck rate

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By default, it is assumed that the UTMI clock is generated from a 12 MHz
reference clock (MAINCK). If it's not the case, the FREQ field of the
SFR_UTMICKTRIM has to be updated to generate the UTMI clock in the
proper way.

The UTMI clock has a fixed rate of 480 MHz. In fact, there is no
multiplier we can configure. The multiplier is managed internally,
depending on the reference clock frequency, to achieve the target of
480 MHz.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Ingo van Lil <inguin@gmx.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Ludovic Desroches
2017-09-06 11:51:59 +02:00
committed by Stephen Boyd
parent 2bd6bf03f4
commit 92041a9ff0
2 changed files with 83 additions and 14 deletions
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2
include/soc/at91/atmel-sfr.h
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@@ -17,6 +17,7 @@
/* 0x08 ~ 0x0c: Reserved */
#define AT91_SFR_OHCIICR 0x10 /* OHCI INT Configuration Register */
#define AT91_SFR_OHCIISR 0x14 /* OHCI INT Status Register */
#define AT91_SFR_UTMICKTRIM 0x30 /* UTMI Clock Trimming Register */
#define AT91_SFR_I2SCLKSEL 0x90 /* I2SC Register */
/* Field definitions */
@@ -28,5 +29,6 @@
AT91_OHCIICR_SUSPEND_B | \
AT91_OHCIICR_SUSPEND_C)
#define AT91_UTMICKTRIM_FREQ GENMASK(1, 0)
#endif /* _LINUX_MFD_SYSCON_ATMEL_SFR_H */