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| author | Moiz Sonasath <m-sonasath@ti.com> | 2010-02-16 18:57:21 -0600 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-03-07 22:17:23 +0100 |
| commit | a29aaf55cd6faa75e35abfe00bd3ffc537490485 (patch) | |
| tree | 8f883a25bb154df5bff43a3980752a973da99a10 /drivers/amba | |
| parent | e82c60ae7d3a7f19c4b9b3e7bd6ea298fa5efe93 (diff) | |
| download | op-kernel-dev-a29aaf55cd6faa75e35abfe00bd3ffc537490485.zip op-kernel-dev-a29aaf55cd6faa75e35abfe00bd3ffc537490485.tar.gz | |
mfd: Disable TWL4030/5030 I2C1/I2C4 internal pull-ups
This patch disables TWL4030/5030 I2C1 adn I2C4(SR) internal pull-up, to
use only the external HW resistor >=470 Ohm for the assured
functionality in HS mode.
While testing the I2C in High Speed mode, it was discovered that
without a proper pull-up resistor, there is data corruption during
multi-byte transfer. RTC(time_set) test case was used for testing.
From the analysis done, it was concluded that ideally we need a
pull-up of 1.6k Ohm(recomended) or atleast 470 Ohm or greater for
assured performance in HS mode.
Signed-off-by: Moiz Sonasath <m-sonasath@ti.com>
Signed-off-by: Allen Pais <allen.pais@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/amba')
0 files changed, 0 insertions, 0 deletions
