This most likely doesn't fix any real bugs, but it's the
right thing to do and reduces the noise level with static
checkers.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This add barebox versions of of_clk_init for parsing and registering
clock providers from DT. Also, a macro CLK_OF_DECLARE is added, that
allows to put init callbacks into its own section that can be linked
in the binary.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Taken from the Linuxkernel with some small adjustments for barebox.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
On MXS we need to poll the busy bit when changing a clock rate, but only
when the parent clocks are enabled. This exposes the already present
function clk_is_enabled which is suitable for this job.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This allows us to better detect whether a clk is enabled or not.
- If we can ask a clk, ask it. If it's enabled, go on and ask parents
- If we can't ask it, but it can be enabled, depend on the enable_count.
if it's positive, go on and ask parents
- If we can't ask it and it cannot be enabled, assume it is enabled
and ask parents.
This makes the CLK_ALWAYS_ENABLED unnecessary, since the fixed clk now
always returns 1 in its is_enabled callback.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Current barebox clk framework allow disable any clock
and there is no means to prevent that.
But there are the clocks that can't be disabled
by software at all.
This patch allow registration of a clock immune to clk_disable().
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Checking for invalid clocks on function entry allows users
to for example do a clk_set_rate(clk_lookup("myclk"), x) without
checking for validity of the result of clk_lookup first.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This adds barebox common clk support loosely based on the Kernel common
clk support. differences are:
- barebox does not need prepare/unprepare
- no parent rate propagation for set_rate
- struct clk is not really encapsulated from the drivers
Along with the clk support we have support for some basic clk building
blocks:
- clk-fixed
- clk-fixed-factor
- clk-mux
- clk-divider
clk-fixed and clk-fixed-factor are completely generic, clk-mux and clk-divider
are currently the way i.MX muxes/dividers are implemented.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Antony Pavlov
Lucas Stach
Sascha Hauer
Sebastian Hesselbarth