linux-toradex.git/drivers/clk/samsung, branch v4.20-rc6

clk: samsung: Use clk_hw API for calling clk framework from clk notifiers

2018-10-05T11:36:39+00:00

clk_notifier_register() documentation states, that the provided notifier
callbacks associated with the notifier must not re-enter into the clk
framework by calling any top-level clk APIs. Fix this by replacing
clk_get_rate() calls with clk_hw_get_rate(), which is safe in this
context.

Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos5420: Enable PERIS clocks for suspend

2018-10-05T11:36:38+00:00

Ensure that clocks for core SoC modules (including TZPC0..9 modules)
are enabled for suspend/resume cycle. This fixes suspend/resume
support on Exynos5422-based Odroid XU3/XU4 boards.

Suggested-by: Joonyoung Shim 
Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos5420: Define CLK_SECKEY gate clock only or Exynos5420

2018-10-05T11:36:37+00:00

The bit of GATE_BUS_PERIS1 for CLK_SECKEY is just reserved on
exynos5422/5800, not exynos5420. Define gate clk for exynos5420 to
handle the bit only on exynos5420.

Signed-off-by: Joonyoung Shim 
[m.szyprow: rewrote commit subject]
Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos5433: Keep sclk_uart clocks enabled in suspend

2018-10-05T11:36:36+00:00

All sclk_uart clocks in TOP CMU have to be kept enabled for suspend/resume
cycle, otherwise TM2(e) boards hangs before entering the suspend mode.

Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: Remove obsolete code for Exynos4412 ISP clocks

2018-10-05T11:36:35+00:00

Exynos4412 ISP clock are provided by separate Exynos4412 ISP clock
driver, so support for them in Exynos4-clk driver can be removed.

Signed-off-by: Marek Szyprowski 
Acked-by: Krzysztof Kozlowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos5433: Add suspend state for TOP, CPIF & PERIC CMUs

2018-10-05T11:36:34+00:00

Before entering system suspend, one has to ensure that some clocks from
TOP, CPIF and PERIC CMUs are enabled. This is needed by the firmware
to properly perform system suspend operation. Instead of adding more and
more clocks with CRITICAL flag, simply enable those clocks directly in
respective CMU registers using 'suspend_regs' feature.

Signed-off-by: Marek Szyprowski 
Reviewed-by: Krzysztof Kozlowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: Use NOIRQ stage for Exynos5433 clocks suspend/resume

2018-10-05T11:36:33+00:00

SoC clock drivers should suspend after every other drivers in the system,
which are using clocks and resume before them. The last stage for calling
suspend device callbacks is NOIRQ stage and there exists driver, which use
that state (dwmmc-exynos), so Exynos5433 clocks driver should also use it.
During the same stage, clocks driver will be always suspended after its
clients as a direct result of proper device probe order (deferred probe
reorders the suspend call sequence).

Signed-off-by: Marek Szyprowski 
Acked-by: Chanwoo Choi 
Reviewed-by: Krzysztof Kozlowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos5420: Use generic helper for handling suspend/resume

2018-10-05T11:36:32+00:00

Replace common suspend/resume handling code by generic helper.
Almost no functional change, the only difference is in handling
of hypothetical memory allocation failure on boot.

Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: exynos4: Use generic helper for handling suspend/resume

2018-10-05T11:36:32+00:00

Replace common suspend/resume handling code by generic helper.
Handling of PLLs is a bit different in generic code, as they are handled
in the same way as other clock registers. Such approach was already used
on later Exynos SoCs and worked fine. Tests have shown that it works also
on Exynos4 SoCs and significantly simplifies the code.

Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki

clk: samsung: Add support for setting registers state before suspend

2018-10-05T11:36:31+00:00

Some registers of clock controller have to be set to certain values before
entering system suspend state. Till now drivers did that on their own,
but it will be easier to handle it by generic code and let drivers simply
to provide the list of registers and their state.

Signed-off-by: Marek Szyprowski 
Signed-off-by: Sylwester Nawrocki