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mx31: correct csi_clk parent (v2) 

changes since v1: we now check if the parent configuration bit was
changed since reset and change the parent when needed.

csi_clk parent was defined with ahb_clk. However, according to the
m31 reference manual, it should be serial_pll_clk.

Guennadi always used a 20 MHz clock that was by chance changed to
a 45 MHz that fits in the mt9t031 spec. Now the clocks are computed
and output correctly (measured on oscillo).

Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Valentin Longchamp 2009-05-28 16:46:21 +02:00 committed by Sascha Hauer
parent 0b0ef44295
commit 0573cb5f45
1 changed files with 8 additions and 1 deletions
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9
arch/arm/mach-mx3/clock.c
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@ -483,7 +483,7 @@ DEFINE_CLOCK(i2c3_clk, 2, MXC_CCM_CGR0, 30, NULL, NULL, &perclk_clk);
DEFINE_CLOCK(mpeg4_clk, 0, MXC_CCM_CGR1, 0, NULL, NULL, &ahb_clk);
DEFINE_CLOCK(mstick1_clk, 0, MXC_CCM_CGR1, 2, mstick1_get_rate, NULL, &usb_pll_clk);
DEFINE_CLOCK(mstick2_clk, 1, MXC_CCM_CGR1, 4, mstick2_get_rate, NULL, &usb_pll_clk);
DEFINE_CLOCK1(csi_clk, 0, MXC_CCM_CGR1, 6, csi, NULL, &ahb_clk);
DEFINE_CLOCK1(csi_clk, 0, MXC_CCM_CGR1, 6, csi, NULL, &serial_pll_clk);
DEFINE_CLOCK(rtc_clk, 0, MXC_CCM_CGR1, 8, NULL, NULL, &ipg_clk);
DEFINE_CLOCK(wdog_clk, 0, MXC_CCM_CGR1, 10, NULL, NULL, &ipg_clk);
DEFINE_CLOCK(pwm_clk, 0, MXC_CCM_CGR1, 12, NULL, NULL, &perclk_clk);
@ -571,6 +571,13 @@ int __init mx31_clocks_init(unsigned long fref)
for (i = 0; i < ARRAY_SIZE(lookups); i++)
clkdev_add(&lookups[i]);
/* change the csi_clk parent if necessary */
reg = __raw_readl(MXC_CCM_CCMR);
if (!(reg & MXC_CCM_CCMR_CSCS))
if (clk_set_parent(&csi_clk, &usb_pll_clk))
pr_err("%s: error changing csi_clk parent\n", __func__);
/* Turn off all possible clocks */
__raw_writel((3 << 4), MXC_CCM_CGR0);
__raw_writel(0, MXC_CCM_CGR1);