This is a patch set combining initial effort from Alexandre Belloni [1][2] and a bad one from me [3] to bring proper DT based clocks to Marvell Berlin SoCs. As I was unsure, how Alexandre's initial patch sets fit in the whole picture, I had to look at it myself. It took me a while to sort out the messy clk related registers of Berlin, but finally IMHO I found a good compromise between DT and driver registered clocks. As I don't have any access to BG2Q code/documentation, it needs some additional patches from Alexandre. This is basically berlin2q.dtsi changes and a core clock driver for BG2Q. Anyway, this is nothing that should stall a proper driver-/DT-related review. Apoloigies for the noise the three approaches may have caused, but anybody who takes a closer look at either this patches or the corresponding GPL'd Chromecast SDK [4][5] will quickly see that Marvell HW engineers really hate those who have to write the drivers for their register sets. It is full of "similar" registers for the same IP that received some TLC, like one register is shifted by 4 bits with respect to the other registers dealing with the same functionalities. *sigh* The patches are based on v3.15-rc1 and I have compared the resulting clock frequencies with u-boot's reported frequencies where possible on Chromecast (BG2CD) and NSZ-GS7 (BG2). I'd love to see them in for v3.16 as it will allow us to proceed with working on drivers that actually need those clocks. Current support for Marvell Berlin SoCs is almost limited to serial console, so there is absolutely nothing to break. To make sure it will not break others, I prepared a topic branch and added it to berlin's linux-next branch. The topic branch can be found at https://github.com/shesselba/linux-berlin.git topic/clk Patch 1 first adds a helper function to derive a unique clock name out of the DT nodes name and either the reg property or a magic number. This is taken from DT's platform code, that derives similar unique names for proper platform devices. Patch 2 adds the whole binding documentation for all clock related IP. Patches 3, 4, and 5 then add clock drivers for the Audio/Video PLL, simple PLLs, and complex clock divider cells found on Berlin SoCs. Where required, currently known differences between BG2/BG2CD and BG2Q are taken care of. Patch 6 adds a clock driver for the remaining core clocks of BG2/BG2CD. The register set dealing with it, is shared among input and bypass muxes, clock dividers and clock gates. Patches 7 and 8 finally convert the DT SoC include for BG2 and BG2CD to make use of the new clock related DT nodes. [1] https://lkml.org/lkml/2014/4/23/831 [2] https://lkml.org/lkml/2014/4/24/624 [3] https://lkml.org/lkml/2014/5/8/592 [4] https://code.google.com/p/chromecast-mirrored-source/source/browse/bootloader/berlin_tools/bootloader/clock/galois_speed.c?repo=sdk [5] https://code.google.com/p/chromecast-mirrored-source/source/browse/bootloader/berlin_tools/bootloader/include/Firmware_Berlin_BG2CD_A0/global.h?repo=sdk Alexandre Belloni (2): clk: berlin: add driver for BG2x simple PLLs clk: berlin: add driver for BG2x complex divider cells Sebastian Hesselbarth (6): clk: add helper for unique DT clock names clk: berlin: add clock binding docs for Marvell Berlin2 SoCs clk: berlin: add driver for BG2x audio/video PLL clk: berlin: add core clock driver for BG2/BG2CD ARM: dts: berlin: convert BG2CD to DT clock nodes ARM: dts: berlin: convert BG2 to DT clock nodes .../devicetree/bindings/clock/berlin2-clock.txt | 169 +++++++ arch/arm/boot/dts/berlin2.dtsi | 200 ++++++-- arch/arm/boot/dts/berlin2cd.dtsi | 198 ++++++-- drivers/clk/Makefile | 1 + drivers/clk/berlin/Makefile | 3 + drivers/clk/berlin/berlin2-avpll.c | 373 +++++++++++++++ drivers/clk/berlin/berlin2-div.c | 326 +++++++++++++ drivers/clk/berlin/berlin2-div.h | 80 ++++ drivers/clk/berlin/berlin2-pll.c | 171 +++++++ drivers/clk/berlin/bg2.c | 509 +++++++++++++++++++++ drivers/clk/clk.c | 29 ++ include/dt-bindings/clock/berlin2.h | 35 ++ include/linux/clk-provider.h | 5 + 13 files changed, 2042 insertions(+), 57 deletions(-) create mode 100644 Documentation/devicetree/bindings/clock/berlin2-clock.txt create mode 100644 drivers/clk/berlin/Makefile create mode 100644 drivers/clk/berlin/berlin2-avpll.c create mode 100644 drivers/clk/berlin/berlin2-div.c create mode 100644 drivers/clk/berlin/berlin2-div.h create mode 100644 drivers/clk/berlin/berlin2-pll.c create mode 100644 drivers/clk/berlin/bg2.c create mode 100644 include/dt-bindings/clock/berlin2.h --- Cc: Mike Turquette <mturquette@xxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Pawel Moll <pawel.moll@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx> Cc: Kumar Gala <galak@xxxxxxxxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxxx> Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> Cc: Antoine Tenart <antoine.tenart@xxxxxxxxxxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
