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Message-Id: <1409957256-23729-1-git-send-email-sboyd@codeaurora.org> Date: Fri, 5 Sep 2014 15:47:19 -0700 From: Stephen Boyd <sboyd@...eaurora.org> To: Mike Turquette <mturquette@...aro.org> Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org Subject: [PATCH v2 00/15] Krait clocks + Krait CPUfreq These patches provide cpufreq scaling on devices with Krait CPUs. In Krait CPU designs there's one PLL and two muxes per CPU, allowing us to switch CPU frequencies independently. secondary +-----+ + | QSB |-------+------------|\ +-----+ | | |-+ | +-------|/ | | | + | +-----+ | | | | PLL |----+-------+ | primary +-----+ | | | + | | +-----|\ +------+ +-------+ | | | \ | | | HFPLL |----------+-----------------| |-----| CPU0 | +-------+ | | | | | | | | | | +-----+ | / +------+ | | +-| / 2 |---------|/ | | +-----+ + | | secondary | | + | +------------|\ | | |-+ +---------------|/ | primary + | + +-----|\ +------+ +-------+ | \ | | | HFPLL |----------------------------| |-----| CPU1 | +-------+ | | | | | | +-----+ | / +------+ +-| / 2 |---------|/ +-----+ + To support this in the common clock framework we model the muxes, dividers, and PLLs as different clocks. CPUfreq only interacts with the primary mux (farthest right in the diagram). When CPUfreq sets a rate, the mux code finds the best parent that can provide the rate. Due to the design, QSB and the top PLL are always a fixed rate and thus only support one frequency each. These sources provide the lowest frequencies for the CPUs. The HFPLLs are where we can make the CPU go faster (GHz range). Sometimes we need to run the HFPLL twice as fast and divide it by two to get a particular frequency. When switching rates we can't leave the CPU clocked by the HFPLL because we need to turn off the output of the PLL when changing its frequency. This means we have to switch over to the secondary mux and use one of the fixed sources. This is why we need something like the safe parent patch. I plan to submit the DTS changes through arm-soc, but I've included everything here to make it easier to pick things up for testing, etc. Please note that these patches rely on the Krait L2 accessor patch I posted a while back in another series[1]. This also relies on the cpufreq-generic patchset from Viresh[2]. If anything can be picked up right now it would be better to reduce the churn over time as other pieces settle. The series gets progressively more controversial as it goes on, so I hope that things near the beggining will be picked up earlier. Changes since v1: * Added IPQ and APQ8064 support * Switched to cpufreq-generic * Added OPP parsing from DT (need to write binding though) * New patches to make clk-generic.c go away * Made mux and divider reusable for non-MMIO devices * Added a mux_determine_rate_closest (not sure if this is really needed) * Added unregistration of muxes * New patch to avoid sending high frequencies down to devices using clocks TODO: * Add Krait regulator voltage scaling (not strictly necessary) * Document DT bindings * Use a new efuse/eeprom API instead of hardcoding the location in the driver * Add some thermal awareness Stephen Boyd (15): clk: mux: Add unregistration API clk: mux: Split out register accessors for reuse clk: Add __clk_mux_determine_rate_closest clk: divider: Make generic for usage elsewhere clk: Add safe switch hook clk: Avoid sending high rates to downstream clocks during set_rate clk: qcom: Add support for High-Frequency PLLs (HFPLLs) clk: qcom: Add HFPLL driver clk: qcom: Add MSM8960/APQ8064's HFPLLs clk: qcom: Add IPQ806X's HFPLLs clk: qcom: Add support for Krait clocks clk: qcom: Add KPSS ACC/GCC driver clk: qcom: Add Krait clock controller driver cpufreq: Add module to register cpufreq on Krait CPUs ARM: dts: qcom: Add necessary DT data for Krait cpufreq arch/arm/boot/dts/qcom-apq8064.dtsi | 230 +++++++++++++++++ arch/arm/boot/dts/qcom-msm8960.dtsi | 49 ++++ arch/arm/boot/dts/qcom-msm8974.dtsi | 311 ++++++++++++++++++++++- drivers/clk/clk-divider.c | 197 +++++++++------ drivers/clk/clk-mux.c | 91 ++++--- drivers/clk/clk.c | 133 +++++++--- drivers/clk/qcom/Kconfig | 28 +++ drivers/clk/qcom/Makefile | 5 + drivers/clk/qcom/clk-hfpll.c | 253 +++++++++++++++++++ drivers/clk/qcom/clk-hfpll.h | 54 ++++ drivers/clk/qcom/clk-krait.c | 166 +++++++++++++ drivers/clk/qcom/clk-krait.h | 49 ++++ drivers/clk/qcom/gcc-ipq806x.c | 83 +++++++ drivers/clk/qcom/gcc-msm8960.c | 172 +++++++++++++ drivers/clk/qcom/hfpll.c | 110 +++++++++ drivers/clk/qcom/kpss-xcc.c | 94 +++++++ drivers/clk/qcom/krait-cc.c | 357 +++++++++++++++++++++++++++ drivers/cpufreq/Kconfig.arm | 9 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/qcom-cpufreq.c | 199 +++++++++++++++ include/dt-bindings/clock/qcom,gcc-msm8960.h | 2 + include/linux/clk-private.h | 2 + include/linux/clk-provider.h | 32 ++- 23 files changed, 2486 insertions(+), 141 deletions(-) create mode 100644 drivers/clk/qcom/clk-hfpll.c create mode 100644 drivers/clk/qcom/clk-hfpll.h create mode 100644 drivers/clk/qcom/clk-krait.c create mode 100644 drivers/clk/qcom/clk-krait.h create mode 100644 drivers/clk/qcom/hfpll.c create mode 100644 drivers/clk/qcom/kpss-xcc.c create mode 100644 drivers/clk/qcom/krait-cc.c create mode 100644 drivers/cpufreq/qcom-cpufreq.c [1] http://lkml.iu.edu/hypermail/linux/kernel/1404.0/02636.html [2] git://git.linaro.org/people/viresh.kumar/linux cpufreq/cpu0-krait-v3 -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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