diff options
| author | Marek Vasut <marex@denx.de> | 2012-11-30 18:17:07 +0000 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2012-12-11 13:17:30 -0700 |
| commit | fa5e2845a867a3715240ff221aaec2825b5c73df (patch) | |
| tree | 84fb219f6965ce523fd429324785c3c60c142d72 /arch | |
| parent | 1e2fc0d19bac9bf4f62d259169e902e700a18bad (diff) | |
| download | u-boot-imx-fa5e2845a867a3715240ff221aaec2825b5c73df.zip u-boot-imx-fa5e2845a867a3715240ff221aaec2825b5c73df.tar.gz u-boot-imx-fa5e2845a867a3715240ff221aaec2825b5c73df.tar.bz2 | |
mxs: i2c: Implement algorithm to set up arbitrary i2c speed
This algorithm computes the values of TIMING{0,1,2} registers for the
MX28 I2C block. This algorithm was derived by using a scope, but the
result seems correct.
The resulting values programmed into the registers do not correlate
with the contents in datasheet. When using the values from the datasheet,
the I2C clock were completely wrong.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/clock.c | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mxs/clock.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/clock.c b/arch/arm/cpu/arm926ejs/mxs/clock.c index bfea6ab..4ff19c3 100644 --- a/arch/arm/cpu/arm926ejs/mxs/clock.c +++ b/arch/arm/cpu/arm926ejs/mxs/clock.c @@ -333,6 +333,8 @@ uint32_t mxc_get_clock(enum mxc_clock clk) return mx28_get_sspclk(MXC_SSPCLK2); case MXC_SSP3_CLK: return mx28_get_sspclk(MXC_SSPCLK3); + case MXC_XTAL_CLK: + return XTAL_FREQ_KHZ * 1000; } return 0; diff --git a/arch/arm/include/asm/arch-mxs/clock.h b/arch/arm/include/asm/arch-mxs/clock.h index 1700fe3..3d39ef2 100644 --- a/arch/arm/include/asm/arch-mxs/clock.h +++ b/arch/arm/include/asm/arch-mxs/clock.h @@ -35,6 +35,7 @@ enum mxc_clock { MXC_SSP1_CLK, MXC_SSP2_CLK, MXC_SSP3_CLK, + MXC_XTAL_CLK, }; enum mxs_ioclock { |