net: dsa: xrs700x: Correctly address device over I2C

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On read, master should send 31 MSB of the register (only even values
are ever used), followed by a 1 to indicate read. Then, reading two
bytes, the device will output the register's value.

On write, master sends 31 MSB of the register, followed by a 0 to
indicate write, followed by two bytes containing the register value.

Flexibilis' documentation (version 1.3) specifies the opposite
polarity (#read/write), but the scope indicates that it is, in fact,
read/#write.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: George McCollister <george.mccollister@gmail.com>
Link: https://lore.kernel.org/r/20210202191645.439-1-tobias@waldekranz.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Tobias Waldekranz 2021-02-02 20:16:45 +01:00 • committed by Jakub Kicinski

parent b53014f079

commit add285bce3

1 changed files with 14 additions and 17 deletions

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31

drivers/net/dsa/xrs700x/xrs700x_i2c.c

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