Hi!
Exynos4412 ISP clock controller is located in the SOC area, which belongs
to ISP power domain. This was not properly handled by the current
Exynos4-clk driver. This patchset instantiates a separate clock driver
for those clocks, updates all clients of ISP clocks and ensures that
the driver is properly integrated in ISP power domin using runtime PM
feature of the clock framework.
This finally solves all the mysterious freezes in accessing ISP clocks
when ISP power domain is disabled.
The last patch breaks support for old dtbs. It can be applied when all
boards are updated. Exynos4412 ISP subsystem is only used by Trats2
boards, for which kernel is updated always together with the dtb file,
so the last patch can be applied to the next kernel release after merging
the DTS patch.
This patchset requires clocks runtime PM support ("Add runtime PM support
for clocks (on Exynos SoC example)" v9 patchset), which has been recently
merged to clk-next.
Best regards
Marek Szyprowski
Samsung R&D Institute Poland
Changelog:
v3:
- moved dt-bindings changes to separate patch and rewrote dt bindings
documentation as requrested by Rob Herring
v2: https://www.spinics.net/lists/linux-samsung-soc/msg60737.html
- fixed minor issues pointed by Krzysztof Kozlowski
v1: https://www.spinics.net/lists/linux-clk/msg20274.html
- initial version of this patchset
Patch summary:
Marek Szyprowski (5):
clk: samsung: Instantiate Exynos4412 ISP clocks only when available
clk: samsung: Add dt bindings for Exynos4412 ISP clock controller
clk: samsung: Add a separate driver for Exynos4412 ISP clocks
ARM: dts: exynos: Add Exynos4412 ISP clock controller
clk: samsung: Remove obsolete code for Exynos4412 ISP clocks
.../devicetree/bindings/clock/exynos4-clock.txt | 43 +++++
arch/arm/boot/dts/exynos4412.dtsi | 71 ++++----
drivers/clk/samsung/Makefile | 1 +
drivers/clk/samsung/clk-exynos4.c | 66 +-------
drivers/clk/samsung/clk-exynos4412-isp.c | 179 +++++++++++++++++++++
include/dt-bindings/clock/exynos4.h | 65 ++++----
6 files changed, 303 insertions(+), 122 deletions(-)
create mode 100644 drivers/clk/samsung/clk-exynos4412-isp.c
--
2.14.2
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