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Nyan: Set I2S1 Source to CLK_M 

This is required to send 1.5Mhz clock to Max98090 and get a right beep sound.

BUG=chrome-os-partner:26609
TEST=Booted Nyan. Verified Max98090 can beep. Measured frequency by smartphone.
BRANCH=none
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Change-Id: Ie3ff6df6759cb23d78dc05069553ddb4eb8e508a
Original-Reviewed-on: https://chromium-review.googlesource.com/191791
Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org>

(cherry picked from commit 2f75a147f26ac334fff174a1f9618a2bbe290fe9)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: If8c7871dc8202f98ccf23fb0afad1e7745fbf174
Reviewed-on: http://review.coreboot.org/7457
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Daisuke Nojiri 2014-03-26 15:04:10 -07:00 committed by Marc Jones
parent 4a12cfe759
commit 14ade701bd
1 changed files with 4 additions and 3 deletions
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7
src/mainboard/google/nyan/mainboard.c
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@ -53,10 +53,11 @@ static void set_clock_sources(void)
clock_configure_irregular_source(extperiph1, CLK_M, 12000, 3);
/*
* I2S1 can use either PLLP or PLLA. Using PLLP is sufficient now since
* we only need 4.8MHz. Note the source id of PLLP for I2S is 4.
* We need 1.5MHz. So, we use CLK_M. CLK_DIVIDER macro returns a divisor
* (0xe) a little bit off from the ideal value (0xd) but it's good
* enough for beeps. The source id of CLK_M for I2S is 6.
*/
clock_configure_irregular_source(i2s1, PLLP, 4800, 4);
clock_configure_irregular_source(i2s1, CLK_M, 1500, 6);
/* Note source id of PLLP for HOST1x is 4. */
clock_configure_irregular_source(host1x, PLLP, 408000, 4);