Commit Graph

4 Commits

Author SHA1 Message Date
Mike Looijmans dc59c13375 clk: clk-si544: Implement small frequency change support
The Si544 supports changing frequencies "on the fly" when the change is
less than 950 ppm from the current center frequency. The driver now
uses the small adjustment routine for implementing this.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-06-27 13:45:38 -07:00
Mike Looijmans e8f127caf6 clk-si514, clk-si544: Implement prepare/unprepare/is_prepared operations
This adds prepare/unprepare/is_prepared functionality to the drivers for
the SI544 and SI514 chips, allowing the clock output to be disabled when
the clock is not in use.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-06-29 10:59:40 -07:00
Mike Looijmans 4d3f36c5e9 clk-si544: Properly round requested frequency to nearest match
The si544 driver had a rounding problem that using the result of clk_round_rate
may set the clock to yet another rate, for example:
clk_round_rate(195000000) = 194999999
clk_round_rate(194999999) = 194999998

Clients would expect that after clk_set_rate(clk, freq2=clk_round_rate(clk, freq)) the
chip will be running at exactly freq2.

The problem was in the calculation of the feedback divider, it was always rounded
down instead of to the nearest possible VCO value.

After this change, the following holds true for any supported frequency:
actual_freq = clk_round_rate(clk, freq);
clk_set_rate(clk, actual_freq);
clk_round_rate(clk, actual_freq) == actual_freq && clk_get_rate(clk) == actual_freq

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Fixes: 953cc3e811 ("clk: Add driver for the si544 clock generator chip")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-06-01 23:24:52 -07:00
Mike Looijmans 953cc3e811 clk: Add driver for the si544 clock generator chip
This patch adds the driver and devicetree documentation for the
Silicon Labs SI544 clock generator chip. This is an I2C controlled
oscillator capable of generating clock signals ranging from 200kHz
to 1500MHz.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
[sboyd: assign max_freq to 0 in is_valid_frequency() to squelch warning]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-03-23 10:05:25 -07:00