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| author | Stefan Agner <stefan@agner.ch> | 2015-04-15 16:24:23 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-04-23 14:56:08 -0400 |
| commit | 8b4f9afac0642cea73084401d07f791f2ac63104 (patch) | |
| tree | 06a6756550c722a87bca2447c6ac4223a6161f6a /board/freescale | |
| parent | c7ea243cc095d6510e1a1e3a4969e787a9d41271 (diff) | |
| download | u-boot-imx-8b4f9afac0642cea73084401d07f791f2ac63104.zip u-boot-imx-8b4f9afac0642cea73084401d07f791f2ac63104.tar.gz u-boot-imx-8b4f9afac0642cea73084401d07f791f2ac63104.tar.bz2 | |
ARM: vf610: Enable external 32KHz oscillator
Enable the SCSC (Slow Clock Source Controller) and select the external
32KHz oscillator. This improves the accuracy of the RTC.
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Diffstat (limited to 'board/freescale')
| -rw-r--r-- | board/freescale/vf610twr/vf610twr.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/board/freescale/vf610twr/vf610twr.c b/board/freescale/vf610twr/vf610twr.c index eb27542..4160acd 100644 --- a/board/freescale/vf610twr/vf610twr.c +++ b/board/freescale/vf610twr/vf610twr.c @@ -227,7 +227,7 @@ static void clock_init(void) CCM_CCGR2_PORTD_CTRL_MASK | CCM_CCGR2_PORTE_CTRL_MASK | CCM_CCGR2_QSPI0_CTRL_MASK); clrsetbits_le32(&ccm->ccgr3, CCM_REG_CTRL_MASK, - CCM_CCGR3_ANADIG_CTRL_MASK); + CCM_CCGR3_ANADIG_CTRL_MASK | CCM_CCGR3_SCSC_CTRL_MASK); clrsetbits_le32(&ccm->ccgr4, CCM_REG_CTRL_MASK, CCM_CCGR4_WKUP_CTRL_MASK | CCM_CCGR4_CCM_CTRL_MASK | CCM_CCGR4_GPC_CTRL_MASK | CCM_CCGR4_I2C0_CTRL_MASK); @@ -308,9 +308,20 @@ int board_early_init_f(void) int board_init(void) { + struct scsc_reg *scsc = (struct scsc_reg *)SCSC_BASE_ADDR; + /* address of boot parameters */ gd->bd->bi_boot_params = PHYS_SDRAM + 0x100; + /* + * Enable external 32K Oscillator + * + * The internal clock experiences significant drift + * so we must use the external oscillator in order + * to maintain correct time in the hwclock + */ + setbits_le32(&scsc->sosc_ctr, SCSC_SOSC_CTR_SOSC_EN); + return 0; } |