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path: root/drivers/clk/clk-cs2000-cp.c
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2022-04-22clk: cs2000-cp: use simple i2c probe functionStephen Kitt1-3/+2
The i2c probe function here doesn't use the id information provided in its second argument, so the single-parameter i2c probe function ("probe_new") can be used instead. This avoids scanning the identifier tables during probes. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20220407151831.2371706-4-steve@sk2.org Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2022-01-25clk: cs2000-cp: convert driver to regmapDaniel Mack1-56/+68
Regmap gives us caching, debugging infrastructure and other things for free and does away with open-coded bit-fiddling implementations. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20220125093336.226787-10-daniel@zonque.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2022-01-25clk: cs2000-cp: freeze config during register fiddlingDaniel Mack1-0/+9
Make sure to freeze the configuration of the chip during the programming of 32-bit registers. This avoids the processing of invalid intermediate states. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20220125093336.226787-9-daniel@zonque.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2022-01-25clk: cs2000-cp: make clock skip setting configurableDaniel Mack1-1/+4
The clock skip function of this chip is not necessarily desirable in all hardware appliances. This patch makes the feature configurable through a device-tree property. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20220125093336.226787-8-daniel@zonque.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2022-01-25clk: cs2000-cp: add support for dynamic modeDaniel Mack1-37/+74
The CS2000 chip features two input clocks, REF_CLK and CLK_IN. In static mode, the output clock (CLK_OUT) is directly derived from REF_CLK, and CLK_IN is ignored. In dynamic mode, CLK_IN is used by the digital PLL. In dynamic mode, a low-frequency ratio configuration that uses a higher multiplier factor. Until now, only the static mode and high-frequency divider rations of the hardware was supported by the driver. This patch adds support for dynamic mode and both ratios: * Parse a new OF property 'cirrus,dynamic-mode' to determine the mode * In dynamic mode, present CLK_IN as parent clock, else use REF_CLK * The low-frequency ratio mode is automatically selected, depending on the mode of operation and the given input and output rates Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20220125093336.226787-7-daniel@zonque.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2022-01-25clk: cs2000-cp: Make aux output function controllableDaniel Mack1-0/+9
The aux output pin can be configured to output either of the two clock inputs, the generated clock or the pll lock status. Allow access to this feature through a new optional device-tree property. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20220125093336.226787-6-daniel@zonque.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-08-02clk: cs2000-cp: convert to SPDX identifiersKuninori Morimoto1-4/+1
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-04-16clk: cs2000: mark resume function as __maybe_unusedArnd Bergmann1-1/+1
When power management is disabled, we get a harmless warning: drivers/clk/clk-cs2000-cp.c:544:12: error: 'cs2000_resume' defined but not used [-Werror=unused-function] Marking the function as __maybe_unused lets the compiler silently drop it instead. Fixes: eade4ccdb087 ("clk: cs2000: set pm_ops in hibernate-compatible way") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-04-06clk: cs2000: set pm_ops in hibernate-compatible wayNikita Yushchenko1-1/+1
Use SET_LATE_SYSTEM_SLEEP_PM_OPS() macro instead of direct assignment to .resume_early field. This fixes initialization of CS2000 in restore from hibernation in case of kernel used to load image did not initialize CS2000 while kernel being restored had CS2000 initialized. Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2017-08-31clk: cs2000: Add cs2000_set_saved_rateGaku Inami1-4/+10
This patch adds the common function to reset the clk rate in order to be able to use it in other cases. Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com> Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-04-19clk: cs2000: select 12.20 High Accuracy on LFRatioCfgKuninori Morimoto1-0/+11
cs2000 can select Static/Dynamic ratio based Frequency Synthesizer Mode, it can select 20.12 High Multiplier interpret for 32-bit User Defined Ratio if Dynamic ratio mode. Otherwise it should select 12.20 High Accuracy mode. Current cs2000 is supporting Static ratio mode only, so it should select 12.20 High Accuracy mode, not 20.12 High Multiplier mode. This patch fixes it. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-04-19clk: cs2000: tidyup DEVICE_CFG2 settingsKuninori Morimoto1-3/+5
DEVICE_CFG2 can select ratio from user defined ratio and LOCKCLK is for it. But current driver sets fixed 0 value. This patch fixes it. Note is that current cs2000 driver is using/supporting only ratio0 (= ch0) now. DEVICE_CFG2 can select STATIC/DYNAMIC ratio mode, and current cs2000 driver is selecting STATIC mode, but it was not understandable on current code. This patch also solve this issue. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-04-19clk: cs2000: enable clock skipping modeKuninori Morimoto1-0/+6
CLK_IN skipping mode allows the PLL to maintain lock even when the CLK_IN signal has missing pulses for up to 20 ms (t CS) at a time. This patch enables it Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-04-12clk: cs2000: use existing priv_to_dev() to getting struct deviceKuninori Morimoto1-5/+3
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@baylibre.com>
2017-04-12cs-2000-cp: keep Reserved bit on each registerKuninori Morimoto1-3/+22
Thus CS2000 datasheet is indicating below, this patch follows it. WARNING: All "Reserved" registers must maintain their default state to ensure proper functional operation. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@baylibre.com>
2017-01-20clk: cs2000: add Suspend/Resume featureKhiem Nguyen1-0/+22
CS2000 needs re-setup when redume, otherwise, it can't handle correct clock rate. Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com> [Kuninori: cleanup original patch] Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2016-08-24clk: cs2000: Migrate to clk_hw based OF and registration APIsStephen Boyd1-10/+6
Now that we have clk_hw based provider APIs to register clks, we can get rid of struct clk pointers while registering clks in these drivers, allowing us to move closer to a clear split of consumer and provider clk APIs. Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2015-11-30clk: add CS2000 Fractional-N driverKuninori Morimoto1-0/+510
This patch adds CS2000 Fractional-N driver as clock provider. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> [sboyd@codeaurora.org: Fix unsigned checked for < 0 in cs2000_ratio_get()] Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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