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Add custom I2C accessors to this driver, since the regular I2C regmap ones
do not generate the exact I2C transfers required by the chip. On I2C write,
it is mandatory to send transfer length first, on read the chip returns the
transfer length in first byte. Instead of always reading back 8 bytes, which
is the default and also the size of the entire register file, set BCP register
to 1 to read out 1 byte which is less wasteful.
Fixes: 892e0ddea1aa ("clk: rs9: Add Renesas 9-series PCIe clock generator driver")
Reported-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20220929195521.284497-1-marex@denx.de
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The i2c probe function here doesn't use the id information provided in
its second argument, so the single-parameter i2c probe function
("probe_new") can be used instead.
This avoids scanning the identifier tables during probes.
Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20220407151831.2371706-11-steve@sk2.org
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Add driver for Renesas 9-series PCIe clock generators. This driver
is designed to support 9FGV/9DBV/9DMV/9FGL/9DML/9QXL/9SQ series I2C
PCIe clock generators, currently the only tested and supported chip
is 9FGV0241.
The driver is capable of configuring per-chip spread spectrum mode
and output amplitude, as well as per-output slew rate.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: devicetree@vger.kernel.org
Link: https://lore.kernel.org/r/20220226040723.143705-3-marex@denx.de
[sboyd@kernel.org: Use non-underscore API for fixed factor]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
