This series adds support for hisilicon stub clock driver. On hi6220, the bootloader needs load the firmware image and set info for OPPs; after run into kernel, the stub clock driver is used to communicate w/t firmware for cpu dynamic frequency scaling. In patch series v1/v2, the stub clock driver simply writes request in sram and send ipc to firmware; For patch series v3, the firmware has been upgraded to use mailbox, so stub clock driver will call standard mailbox APIs to request mailbox channel and send message to firmware. Patch 4 adds stub clock node into dts and it references mailbox with phandle, so patch 4 will depend on mailbox driver's patch series [1]. These patches have been tested on 96board hikey and is used by cpufreq driver. Changes from v3: * Patch "clk: hisi: refine parameter checking for init" [2] has been applied to clk-next, so skip it in v4 * According to Stephen Boyd's review, fix and refine stub clock driver * The stub clock driver depends on mailbox channel's initialization, so mailbox init firstly with core_initcall() and use subsys_initcall() for stub clock driver Changes from v2: * Use platform_device's probe for clock's initialization * Use mailbox channel for clock frequency change Changes from v1: * Refine parameter checking for init flow * Remove unnecessary debugging info * Modify to check spinlock pointer when register clocks [1] http://archive.arm.linux.org.uk/lurker/message/20150803.011307.1062b247.en.html [2] http://archive.arm.linux.org.uk/lurker/message/20150803.011334.4b6f2fc7.en.html Leo Yan (4): dt-bindings: arm: Hi6220: add doc for SRAM controller dt-bindings: clk: Hi6220: Document stub clock driver clk: Hi6220: add stub clock driver arm64: dts: add Hi6220's stub clock node .../bindings/arm/hisilicon/hisilicon.txt | 18 ++ .../devicetree/bindings/clock/hi6220-clock.txt | 19 +- arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 23 ++ drivers/clk/hisilicon/Kconfig | 2 +- drivers/clk/hisilicon/Makefile | 2 +- drivers/clk/hisilicon/clk-hi6220-stub.c | 276 +++++++++++++++++++++ 6 files changed, 337 insertions(+), 3 deletions(-) create mode 100644 drivers/clk/hisilicon/clk-hi6220-stub.c -- 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
