clk: si5341: Wait for DEVICE_READY on startup

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The Si5341 datasheet warns that before accessing any other registers,
including the PAGE register, we need to wait for the DEVICE_READY register
to indicate the device is ready, or the process of the device loading its
state from NVM can be corrupted. Wait for DEVICE_READY on startup before
continuing initialization. This is done using a raw I2C register read
prior to setting up regmap to avoid any potential unwanted automatic PAGE
register accesses from regmap at this stage.

Fixes: 3044a860fd ("clk: Add Si5341/Si5340 driver")
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Link: https://lore.kernel.org/r/20210325192643.2190069-3-robert.hancock@calian.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

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Robert Hancock 2021-03-25 13:26:36 -06:00 • committed by Stephen Boyd

parent c832bb98d3

commit 6e7d2de1e0

1 changed files with 32 additions and 0 deletions

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drivers/clk/clk-si5341.c

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