[v8,07/34] clk: tegra: Support runtime PM and power domain

Message ID	20210817012754.8710-8-digetx@gmail.com
State	New
Headers	show Return-Path: <linux-spi-owner@kernel.org> From: Dmitry Osipenko <digetx@gmail.com> To: Thierry Reding <thierry.reding@gmail.com>, Jonathan Hunter <jonathanh@nvidia.com>, Ulf Hansson <ulf.hansson@linaro.org>, Viresh Kumar <vireshk@kernel.org>, Stephen Boyd <sboyd@kernel.org>, Peter De Schrijver <pdeschrijver@nvidia.com>, Mikko Perttunen <mperttunen@nvidia.com>, Peter Chen <peter.chen@kernel.org>, Mark Brown <broonie@kernel.org>, Lee Jones <lee.jones@linaro.org>, =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>, Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>, Richard Weinberger <richard@nod.at>, Miquel Raynal <miquel.raynal@bootlin.com>, Lucas Stach <dev@lynxeye.de>, Stefan Agner <stefan@agner.ch>, Adrian Hunter <adrian.hunter@intel.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Rob Herring <robh+dt@kernel.org>, Michael Turquette <mturquette@baylibre.com> Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v8 07/34] clk: tegra: Support runtime PM and power domain Date: Tue, 17 Aug 2021 04:27:27 +0300 Message-Id: <20210817012754.8710-8-digetx@gmail.com> In-Reply-To: <20210817012754.8710-1-digetx@gmail.com> References: <20210817012754.8710-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	NVIDIA Tegra power management patches for 5.16 \| expand [v8,00/34] NVIDIA Tegra power management patches for 5.16 [v8,01/34] opp: Add dev_pm_opp_sync() helper [v8,02/34] soc/tegra: pmc: Disable PMC state syncing [v8,03/34] soc/tegra: Don't print error message when OPPs not available [v8,04/34] soc/tegra: Add devm_tegra_core_dev_init_opp_table_simple() [v8,05/34] soc/tegra: Use dev_pm_opp_sync() [v8,06/34] dt-bindings: clock: tegra-car: Document new tegra-clocks sub-node [v8,07/34] clk: tegra: Support runtime PM and power domain [v8,08/34] dt-bindings: host1x: Document OPP and power domain properties [v8,09/34] dt-bindings: host1x: Document Memory Client resets of Host1x, GR2D and GR3D [v8,10/34] gpu: host1x: Add host1x_channel_stop() [v8,11/34] gpu: host1x: Add runtime PM and OPP support [v8,12/34] drm/tegra: dc: Support OPP and SoC core voltage scaling [v8,13/34] drm/tegra: hdmi: Add OPP support [v8,14/34] drm/tegra: gr2d: Support power management [v8,15/34] drm/tegra: gr3d: Support power management [v8,16/34] drm/tegra: vic: Support system suspend [v8,17/34] usb: chipidea: tegra: Add runtime PM and OPP support [v8,18/34] bus: tegra-gmi: Add runtime PM and OPP support [v8,19/34] pwm: tegra: Add runtime PM and OPP support [v8,20/34] mmc: sdhci-tegra: Add runtime PM and OPP support [v8,21/34] mtd: rawnand: tegra: Add runtime PM and OPP support [v8,22/34] spi: tegra20-slink: Add OPP support [v8,23/34] media: dt: bindings: tegra-vde: Convert to schema [v8,24/34] media: dt: bindings: tegra-vde: Document OPP and power domain [v8,25/34] media: staging: tegra-vde: Support generic power domain and OPP [v8,26/34] soc/tegra: fuse: Add OPP support [v8,27/34] soc/tegra: fuse: Reset hardware [v8,28/34] soc/tegra: regulators: Prepare for suspend [v8,29/34] soc/tegra: pmc: Enable core domain support for Tegra20 and Tegra30 [v8,30/34] ARM: tegra: Add OPP tables and power domains to Tegra20 device-trees [v8,31/34] ARM: tegra: Add OPP tables and power domains to Tegra30 device-trees [v8,32/34] ARM: tegra: Add Memory Client resets to Tegra20 GR2D, GR3D and Host1x [v8,33/34] ARM: tegra: Add Memory Client resets to Tegra30 GR2D, GR3D and Host1x [v8,34/34] ARM: tegra20/30: Disable unused host1x hardware

diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile index 7b1816856eb5..a0715cdfc1a4 100644 --- a/drivers/clk/tegra/Makefile +++ b/drivers/clk/tegra/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-y += clk.o obj-y += clk-audio-sync.o +obj-y += clk-device.o obj-y += clk-dfll.o obj-y += clk-divider.o obj-y += clk-periph.o diff --git a/drivers/clk/tegra/clk-device.c b/drivers/clk/tegra/clk-device.c new file mode 100644 index 000000000000..1399eaba1c91 --- /dev/null +++ b/drivers/clk/tegra/clk-device.c @@ -0,0 +1,222 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_domain.h> +#include <linux/pm_opp.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +#include <soc/tegra/common.h> + +#include "clk.h" + +/* + * This driver manages performance state of the core power domain for the + * independent PLLs and system clocks. We created a virtual clock device + * for such clocks, see tegra_clk_register(). + */ + +struct tegra_clk_device { + struct notifier_block clk_nb; + struct device *dev; + struct clk_hw *hw; + struct mutex lock; +}; + +static int tegra_clock_set_pd_state(struct tegra_clk_device *clk_dev, + unsigned long rate) +{ + struct device *dev = clk_dev->dev; + struct dev_pm_opp *opp; + unsigned int pstate; + + opp = dev_pm_opp_find_freq_ceil(dev, &rate); + if (opp == ERR_PTR(-ERANGE)) { + dev_dbg(dev, "failed to find ceil OPP for %luHz\n", rate); + opp = dev_pm_opp_find_freq_floor(dev, &rate); + } + + if (IS_ERR(opp)) { + dev_err(dev, "failed to find OPP for %luHz: %pe\n", rate, opp); + return PTR_ERR(opp); + } + + pstate = dev_pm_opp_get_required_pstate(opp, 0); + dev_pm_opp_put(opp); + + return dev_pm_genpd_set_performance_state(dev, pstate); +} + +static int tegra_clock_change_notify(struct notifier_block *nb, + unsigned long msg, void *data) +{ + struct clk_notifier_data *cnd = data; + struct tegra_clk_device *clk_dev; + int err = 0; + + clk_dev = container_of(nb, struct tegra_clk_device, clk_nb); + + mutex_lock(&clk_dev->lock); + switch (msg) { + case PRE_RATE_CHANGE: + if (cnd->new_rate > cnd->old_rate) + err = tegra_clock_set_pd_state(clk_dev, cnd->new_rate); + break; + + case ABORT_RATE_CHANGE: + err = tegra_clock_set_pd_state(clk_dev, cnd->old_rate); + break; + + case POST_RATE_CHANGE: + if (cnd->new_rate < cnd->old_rate) + err = tegra_clock_set_pd_state(clk_dev, cnd->new_rate); + break; + + default: + break; + } + mutex_unlock(&clk_dev->lock); + + return notifier_from_errno(err); +} + +static int tegra_clock_sync_pd_state(struct tegra_clk_device *clk_dev) +{ + unsigned long rate; + int ret = 0; + + mutex_lock(&clk_dev->lock); + + if (!pm_runtime_status_suspended(clk_dev->dev)) { + rate = clk_hw_get_rate(clk_dev->hw); + ret = tegra_clock_set_pd_state(clk_dev, rate); + } + + mutex_unlock(&clk_dev->lock); + + return ret; +} + +static int tegra_clock_probe(struct platform_device *pdev) +{ + struct tegra_clk_device *clk_dev; + struct device *dev = &pdev->dev; + struct clk *clk; + int err; + + if (!dev->pm_domain) + return -EINVAL; + + clk_dev = devm_kzalloc(dev, sizeof(*clk_dev), GFP_KERNEL); + if (!clk_dev) + return -ENOMEM; + + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + clk_dev->dev = dev; + clk_dev->hw = __clk_get_hw(clk); + clk_dev->clk_nb.notifier_call = tegra_clock_change_notify; + mutex_init(&clk_dev->lock); + + platform_set_drvdata(pdev, clk_dev); + + err = devm_tegra_core_dev_init_opp_table_simple(dev); + if (err) + return err; + + err = clk_notifier_register(clk, &clk_dev->clk_nb); + if (err) { + dev_err(dev, "failed to register clk notifier: %d\n", err); + return err; + } + + /* + * The driver is attaching to a potentially active/resumed clock, hence + * we need to sync the power domain performance state in a accordance to + * the clock rate if clock is resumed. + */ + err = tegra_clock_sync_pd_state(clk_dev); + if (err) + goto unreg_clk; + + return 0; + +unreg_clk: + clk_notifier_unregister(clk, &clk_dev->clk_nb); + + return err; +} + +static __maybe_unused int tegra_clock_pm_suspend(struct device *dev) +{ + struct tegra_clk_device *clk_dev = dev_get_drvdata(dev); + + /* + * Power management of the clock is entangled with the Tegra PMC + * GENPD because PMC driver enables/disables clocks for toggling + * of the PD's on/off state. + * + * The PMC GENPD is resumed in NOIRQ phase, before RPM of the clocks + * becomes available, hence PMC can't use clocks at the early resume + * phase if RPM is involved. For example when 3d clock is enabled, + * it may enable the parent PLL clock that needs to be RPM-resumed. + * + * Secondly, the PLL clocks may be enabled by the low level suspend + * code, so we need to assume that PLL is in enabled state during + * suspend. + * + * We will keep PLLs and system clock resumed during suspend time. + * All PLLs on all SoCs are low power and system clock is always-on, + * so practically not much is changed here. + */ + + return clk_prepare(clk_dev->hw->clk); +} + +static __maybe_unused int tegra_clock_pm_resume(struct device *dev) +{ + struct tegra_clk_device *clk_dev = dev_get_drvdata(dev); + + clk_unprepare(clk_dev->hw->clk); + + return 0; +} + +static void tegra_clock_shutdown(struct platform_device *pdev) +{ + struct tegra_clk_device *clk_dev = platform_get_drvdata(pdev); + + clk_prepare(clk_dev->hw->clk); +} + +static const struct dev_pm_ops tegra_clock_pm = { + SET_SYSTEM_SLEEP_PM_OPS(tegra_clock_pm_suspend, + tegra_clock_pm_resume) +}; + +static const struct of_device_id tegra_clock_match[] = { + { .compatible = "nvidia,tegra20-sclk" }, + { .compatible = "nvidia,tegra30-sclk" }, + { .compatible = "nvidia,tegra30-pllc" }, + { .compatible = "nvidia,tegra30-plle" }, + { .compatible = "nvidia,tegra30-pllm" }, + { } +}; + +static struct platform_driver tegra_clock_driver = { + .driver = { + .name = "tegra-clock", + .of_match_table = tegra_clock_match, + .pm = &tegra_clock_pm, + .suppress_bind_attrs = true, + }, + .probe = tegra_clock_probe, + .shutdown = tegra_clock_shutdown, +}; +builtin_platform_driver(tegra_clock_driver); diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c index eaa079c177c3..131efc53659d 100644 --- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -1914,7 +1914,7 @@ static struct clk *_tegra_clk_register_pll(struct tegra_clk_pll *pll, /* Data in .init is copied by clk_register(), so stack variable OK */ pll->hw.init = &init; - return clk_register(NULL, &pll->hw); + return tegra_clk_register(&pll->hw); } struct clk *tegra_clk_register_pll(const char *name, const char *parent_name, diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c index 6099c6e9acd4..d1af4817051e 100644 --- a/drivers/clk/tegra/clk-super.c +++ b/drivers/clk/tegra/clk-super.c @@ -226,7 +226,7 @@ struct clk *tegra_clk_register_super_mux(const char *name, /* Data in .init is copied by clk_register(), so stack variable OK */ super->hw.init = &init; - clk = clk_register(NULL, &super->hw); + clk = tegra_clk_register(&super->hw); if (IS_ERR(clk)) kfree(super); diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c index 3664593a5ba4..cf92c0f4db61 100644 --- a/drivers/clk/tegra/clk-tegra20.c +++ b/drivers/clk/tegra/clk-tegra20.c @@ -710,13 +710,6 @@ static void tegra20_super_clk_init(void) NULL); clks[TEGRA20_CLK_CCLK] = clk; - /* SCLK */ - clk = tegra_clk_register_super_mux("sclk", sclk_parents, - ARRAY_SIZE(sclk_parents), - CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, - clk_base + SCLK_BURST_POLICY, 0, 4, 0, 0, NULL); - clks[TEGRA20_CLK_SCLK] = clk; - /* twd */ clk = clk_register_fixed_factor(NULL, "twd", "cclk", 0, 1, 4); clks[TEGRA20_CLK_TWD] = clk; @@ -1146,13 +1139,39 @@ static void __init tegra20_clock_init(struct device_node *np) tegra20_periph_clk_init(); tegra20_audio_clk_init(); - tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA20_CLK_CLK_MAX); - tegra_add_of_provider(np, tegra20_clk_src_onecell_get); - tegra_register_devclks(devclks, ARRAY_SIZE(devclks)); tegra_clk_apply_init_table = tegra20_clock_apply_init_table; tegra_cpu_car_ops = &tegra20_cpu_car_ops; } CLK_OF_DECLARE(tegra20, "nvidia,tegra20-car", tegra20_clock_init); + +/* + * Clocks that use runtime PM can't be created at the CLK_OF_DECLARE + * stage because drivers base isn't initialized yet, and thus platform + * devices can't be created for the clocks. Hence we need to split the + * registration of the clocks into two phases. The first phase registers + * essential clocks which don't require RPM and are actually used during + * early boot. The second phase registers clocks which use RPM and this + * is done when device drivers core API is ready. + */ +static int __init tegra20_init_runtime_pm_clocks(void) +{ + struct clk *clk; + + if (!of_machine_is_compatible("nvidia,tegra20")) + return 0; + + clk = tegra_clk_register_super_mux("sclk", sclk_parents, + ARRAY_SIZE(sclk_parents), + CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, + clk_base + SCLK_BURST_POLICY, 0, 4, 0, 0, NULL); + clks[TEGRA20_CLK_SCLK] = clk; + + tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA20_CLK_CLK_MAX); + tegra_register_devclks(devclks, ARRAY_SIZE(devclks)); + + return 0; +} +postcore_initcall_sync(tegra20_init_runtime_pm_clocks); diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c index 64121bc66d85..a8ca313f3c6f 100644 --- a/drivers/clk/tegra/clk-tegra30.c +++ b/drivers/clk/tegra/clk-tegra30.c @@ -812,11 +812,6 @@ static void __init tegra30_pll_init(void) { struct clk *clk; - /* PLLC */ - clk = tegra_clk_register_pll("pll_c", "pll_ref", clk_base, pmc_base, 0, - &pll_c_params, NULL); - clks[TEGRA30_CLK_PLL_C] = clk; - /* PLLC_OUT1 */ clk = tegra_clk_register_divider("pll_c_out1_div", "pll_c", clk_base + PLLC_OUT, 0, TEGRA_DIVIDER_ROUND_UP, @@ -826,11 +821,6 @@ static void __init tegra30_pll_init(void) 0, NULL); clks[TEGRA30_CLK_PLL_C_OUT1] = clk; - /* PLLM */ - clk = tegra_clk_register_pll("pll_m", "pll_ref", clk_base, pmc_base, - CLK_SET_RATE_GATE, &pll_m_params, NULL); - clks[TEGRA30_CLK_PLL_M] = clk; - /* PLLM_OUT1 */ clk = tegra_clk_register_divider("pll_m_out1_div", "pll_m", clk_base + PLLM_OUT, 0, TEGRA_DIVIDER_ROUND_UP, @@ -880,9 +870,6 @@ static void __init tegra30_pll_init(void) ARRAY_SIZE(pll_e_parents), CLK_SET_RATE_NO_REPARENT, clk_base + PLLE_AUX, 2, 1, 0, NULL); - clk = tegra_clk_register_plle("pll_e", "pll_e_mux", clk_base, pmc_base, - CLK_GET_RATE_NOCACHE, &pll_e_params, NULL); - clks[TEGRA30_CLK_PLL_E] = clk; } static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m", @@ -971,14 +958,6 @@ static void __init tegra30_super_clk_init(void) NULL); clks[TEGRA30_CLK_CCLK_LP] = clk; - /* SCLK */ - clk = tegra_clk_register_super_mux("sclk", sclk_parents, - ARRAY_SIZE(sclk_parents), - CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, - clk_base + SCLK_BURST_POLICY, - 0, 4, 0, 0, NULL); - clks[TEGRA30_CLK_SCLK] = clk; - /* twd */ clk = clk_register_fixed_factor(NULL, "twd", "cclk_g", CLK_SET_RATE_PARENT, 1, 2); @@ -1354,13 +1333,56 @@ static void __init tegra30_clock_init(struct device_node *np) tegra30_audio_plls, ARRAY_SIZE(tegra30_audio_plls), 24000000); - tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA30_CLK_CLK_MAX); - tegra_add_of_provider(np, tegra30_clk_src_onecell_get); - tegra_register_devclks(devclks, ARRAY_SIZE(devclks)); tegra_clk_apply_init_table = tegra30_clock_apply_init_table; tegra_cpu_car_ops = &tegra30_cpu_car_ops; } CLK_OF_DECLARE(tegra30, "nvidia,tegra30-car", tegra30_clock_init); + +/* + * Clocks that use runtime PM can't be created at the CLK_OF_DECLARE + * stage because drivers base isn't initialized yet, and thus platform + * devices can't be created for the clocks. Hence we need to split the + * registration of the clocks into two phases. The first phase registers + * essential clocks which don't require RPM and are actually used during + * early boot. The second phase registers clocks which use RPM and this + * is done when device drivers core API is ready. + */ +static int __init tegra30_init_runtime_pm_clocks(void) +{ + struct clk *clk; + + if (!of_machine_is_compatible("nvidia,tegra30")) + return 0; + + /* PLLC */ + clk = tegra_clk_register_pll("pll_c", "pll_ref", clk_base, pmc_base, 0, + &pll_c_params, NULL); + clks[TEGRA30_CLK_PLL_C] = clk; + + /* PLLE */ + clk = tegra_clk_register_plle("pll_e", "pll_e_mux", clk_base, pmc_base, + CLK_GET_RATE_NOCACHE, &pll_e_params, NULL); + clks[TEGRA30_CLK_PLL_E] = clk; + + /* PLLM */ + clk = tegra_clk_register_pll("pll_m", "pll_ref", clk_base, pmc_base, + CLK_SET_RATE_GATE, &pll_m_params, NULL); + clks[TEGRA30_CLK_PLL_M] = clk; + + /* SCLK */ + clk = tegra_clk_register_super_mux("sclk", sclk_parents, + ARRAY_SIZE(sclk_parents), + CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, + clk_base + SCLK_BURST_POLICY, + 0, 4, 0, 0, NULL); + clks[TEGRA30_CLK_SCLK] = clk; + + tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA30_CLK_CLK_MAX); + tegra_register_devclks(devclks, ARRAY_SIZE(devclks)); + + return 0; +} +postcore_initcall_sync(tegra30_init_runtime_pm_clocks); diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c index f6cdce441cf7..868949b723c8 100644 --- a/drivers/clk/tegra/clk.c +++ b/drivers/clk/tegra/clk.c @@ -9,14 +9,19 @@ #include <linux/delay.h> #include <linux/io.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/clk/tegra.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/reset-controller.h> +#include <linux/string.h> #include <soc/tegra/fuse.h> #include "clk.h" /* Global data of Tegra CPU CAR ops */ +static struct device_node *tegra_car_np; static struct tegra_cpu_car_ops dummy_car_ops; struct tegra_cpu_car_ops *tegra_cpu_car_ops = &dummy_car_ops; @@ -320,6 +325,8 @@ void __init tegra_add_of_provider(struct device_node *np, { int i; + tegra_car_np = np; + for (i = 0; i < clk_num; i++) { if (IS_ERR(clks[i])) { pr_err @@ -372,6 +379,63 @@ struct clk ** __init tegra_lookup_dt_id(int clk_id, return NULL; } +static struct device_node *tegra_clk_get_of_node(struct clk_hw *hw) +{ + struct device_node *np, *root; + + if (!tegra_car_np) + return NULL; + + root = of_get_child_by_name(tegra_car_np, "tegra-clocks"); + if (!root) + return NULL; + + for_each_child_of_node(root, np) { + if (strcmp(np->name, hw->init->name)) + continue; + + if (!of_device_is_compatible(np, "nvidia,tegra-clock")) + continue; + + return np; + } + + of_node_put(root); + + return NULL; +} + +struct clk *tegra_clk_register(struct clk_hw *hw) +{ + struct platform_device *pdev; + struct device *dev = NULL; + struct device_node *np; + const char *dev_name; + + np = tegra_clk_get_of_node(hw); + + if (!of_device_is_available(np)) + goto put_node; + + dev_name = kasprintf(GFP_KERNEL, "tegra_clk_%s", hw->init->name); + if (!dev_name) + goto put_node; + + pdev = of_platform_device_create(np, dev_name, NULL); + if (!pdev) { + pr_err("%s: failed to create device for %pOF\n", __func__, np); + kfree(dev_name); + goto put_node; + } + + dev = &pdev->dev; + pm_runtime_enable(dev); +put_node: + of_node_put(np); + + return clk_register(dev, hw); +} + tegra_clk_apply_init_table_func tegra_clk_apply_init_table; static int __init tegra_clocks_apply_init_table(void) diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index 0c3ba0ccce1a..4fab4aa9fa31 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -927,4 +927,6 @@ struct clk *tegra20_clk_register_emc(void __iomem *ioaddr, bool low_jitter); struct clk *tegra210_clk_register_emc(struct device_node *np, void __iomem *regs); +struct clk *tegra_clk_register(struct clk_hw *hw); + #endif /* TEGRA_CLK_H */

[v8,07/34] clk: tegra: Support runtime PM and power domain

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