Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 750 insertions, 0 deletions

diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c
new file mode 100644
index 000000000..f779906cc
--- /dev/null
+++ b/drivers/clk/ti/clkctrl.c
@@ -0,0 +1,750 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * OMAP clkctrl clock support
+ *
+ * Copyright (C) 2017 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo@ti.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+#include <linux/delay.h>
+#include <linux/string_helpers.h>
+#include <linux/timekeeping.h>
+#include "clock.h"
+
+#define NO_IDLEST			0
+
+#define OMAP4_MODULEMODE_MASK		0x3
+
+#define MODULEMODE_HWCTRL		0x1
+#define MODULEMODE_SWCTRL		0x2
+
+#define OMAP4_IDLEST_MASK		(0x3 << 16)
+#define OMAP4_IDLEST_SHIFT		16
+
+#define OMAP4_STBYST_MASK		BIT(18)
+#define OMAP4_STBYST_SHIFT		18
+
+#define CLKCTRL_IDLEST_FUNCTIONAL	0x0
+#define CLKCTRL_IDLEST_INTERFACE_IDLE	0x2
+#define CLKCTRL_IDLEST_DISABLED		0x3
+
+/* These timeouts are in us */
+#define OMAP4_MAX_MODULE_READY_TIME	2000
+#define OMAP4_MAX_MODULE_DISABLE_TIME	5000
+
+static bool _early_timeout = true;
+
+struct omap_clkctrl_provider {
+	void __iomem *base;
+	struct list_head clocks;
+	char *clkdm_name;
+};
+
+struct omap_clkctrl_clk {
+	struct clk_hw *clk;
+	u16 reg_offset;
+	int bit_offset;
+	struct list_head node;
+};
+
+union omap4_timeout {
+	u32 cycles;
+	ktime_t start;
+};
+
+static const struct omap_clkctrl_data default_clkctrl_data[] __initconst = {
+	{ 0 },
+};
+
+static u32 _omap4_idlest(u32 val)
+{
+	val &= OMAP4_IDLEST_MASK;
+	val >>= OMAP4_IDLEST_SHIFT;
+
+	return val;
+}
+
+static bool _omap4_is_idle(u32 val)
+{
+	val = _omap4_idlest(val);
+
+	return val == CLKCTRL_IDLEST_DISABLED;
+}
+
+static bool _omap4_is_ready(u32 val)
+{
+	val = _omap4_idlest(val);
+
+	return val == CLKCTRL_IDLEST_FUNCTIONAL ||
+	       val == CLKCTRL_IDLEST_INTERFACE_IDLE;
+}
+
+static bool _omap4_is_timeout(union omap4_timeout *time, u32 timeout)
+{
+	/*
+	 * There are two special cases where ktime_to_ns() can't be
+	 * used to track the timeouts. First one is during early boot
+	 * when the timers haven't been initialized yet. The second
+	 * one is during suspend-resume cycle while timekeeping is
+	 * being suspended / resumed. Clocksource for the system
+	 * can be from a timer that requires pm_runtime access, which
+	 * will eventually bring us here with timekeeping_suspended,
+	 * during both suspend entry and resume paths. This happens
+	 * at least on am43xx platform. Account for flakeyness
+	 * with udelay() by multiplying the timeout value by 2.
+	 */
+	if (unlikely(_early_timeout || timekeeping_suspended)) {
+		if (time->cycles++ < timeout) {
+			udelay(1 * 2);
+			return false;
+		}
+	} else {
+		if (!ktime_to_ns(time->start)) {
+			time->start = ktime_get();
+			return false;
+		}
+
+		if (ktime_us_delta(ktime_get(), time->start) < timeout) {
+			cpu_relax();
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static int __init _omap4_disable_early_timeout(void)
+{
+	_early_timeout = false;
+
+	return 0;
+}
+arch_initcall(_omap4_disable_early_timeout);
+
+static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
+{
+	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+	u32 val;
+	int ret;
+	union omap4_timeout timeout = { 0 };
+
+	if (clk->clkdm) {
+		ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);
+		if (ret) {
+			WARN(1,
+			     "%s: could not enable %s's clockdomain %s: %d\n",
+			     __func__, clk_hw_get_name(hw),
+			     clk->clkdm_name, ret);
+			return ret;
+		}
+	}
+
+	if (!clk->enable_bit)
+		return 0;
+
+	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
+
+	val &= ~OMAP4_MODULEMODE_MASK;
+	val |= clk->enable_bit;
+
+	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
+
+	if (test_bit(NO_IDLEST, &clk->flags))
+		return 0;
+
+	/* Wait until module is enabled */
+	while (!_omap4_is_ready(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
+		if (_omap4_is_timeout(&timeout, OMAP4_MAX_MODULE_READY_TIME)) {
+			pr_err("%s: failed to enable\n", clk_hw_get_name(hw));
+			return -EBUSY;
+		}
+	}
+
+	return 0;
+}
+
+static void _omap4_clkctrl_clk_disable(struct clk_hw *hw)
+{
+	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+	u32 val;
+	union omap4_timeout timeout = { 0 };
+
+	if (!clk->enable_bit)
+		goto exit;
+
+	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
+
+	val &= ~OMAP4_MODULEMODE_MASK;
+
+	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
+
+	if (test_bit(NO_IDLEST, &clk->flags))
+		goto exit;
+
+	/* Wait until module is disabled */
+	while (!_omap4_is_idle(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
+		if (_omap4_is_timeout(&timeout,
+				      OMAP4_MAX_MODULE_DISABLE_TIME)) {
+			pr_err("%s: failed to disable\n", clk_hw_get_name(hw));
+			break;
+		}
+	}
+
+exit:
+	if (clk->clkdm)
+		ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk);
+}
+
+static int _omap4_clkctrl_clk_is_enabled(struct clk_hw *hw)
+{
+	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+	u32 val;
+
+	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
+
+	if (val & clk->enable_bit)
+		return 1;
+
+	return 0;
+}
+
+static const struct clk_ops omap4_clkctrl_clk_ops = {
+	.enable		= _omap4_clkctrl_clk_enable,
+	.disable	= _omap4_clkctrl_clk_disable,
+	.is_enabled	= _omap4_clkctrl_clk_is_enabled,
+	.init		= omap2_init_clk_clkdm,
+};
+
+static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
+					      void *data)
+{
+	struct omap_clkctrl_provider *provider = data;
+	struct omap_clkctrl_clk *entry = NULL, *iter;
+
+	if (clkspec->args_count != 2)
+		return ERR_PTR(-EINVAL);
+
+	pr_debug("%s: looking for %x:%x\n", __func__,
+		 clkspec->args[0], clkspec->args[1]);
+
+	list_for_each_entry(iter, &provider->clocks, node) {
+		if (iter->reg_offset == clkspec->args[0] &&
+		    iter->bit_offset == clkspec->args[1]) {
+			entry = iter;
+			break;
+		}
+	}
+
+	if (!entry)
+		return ERR_PTR(-EINVAL);
+
+	return entry->clk;
+}
+
+/* Get clkctrl clock base name based on clkctrl_name or dts node */
+static const char * __init clkctrl_get_clock_name(struct device_node *np,
+						  const char *clkctrl_name,
+						  int offset, int index,
+						  bool legacy_naming)
+{
+	char *clock_name;
+
+	/* l4per-clkctrl:1234:0 style naming based on clkctrl_name */
+	if (clkctrl_name && !legacy_naming) {
+		clock_name = kasprintf(GFP_KERNEL, "%s-clkctrl:%04x:%d",
+				       clkctrl_name, offset, index);
+		if (!clock_name)
+			return NULL;
+
+		strreplace(clock_name, '_', '-');
+
+		return clock_name;
+	}
+
+	/* l4per:1234:0 old style naming based on clkctrl_name */
+	if (clkctrl_name)
+		return kasprintf(GFP_KERNEL, "%s_cm:clk:%04x:%d",
+				 clkctrl_name, offset, index);
+
+	/* l4per_cm:1234:0 old style naming based on parent node name */
+	if (legacy_naming)
+		return kasprintf(GFP_KERNEL, "%pOFn:clk:%04x:%d",
+				 np->parent, offset, index);
+
+	/* l4per-clkctrl:1234:0 style naming based on node name */
+	return kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", np, offset, index);
+}
+
+static int __init
+_ti_clkctrl_clk_register(struct omap_clkctrl_provider *provider,
+			 struct device_node *node, struct clk_hw *clk_hw,
+			 u16 offset, u8 bit, const char * const *parents,
+			 int num_parents, const struct clk_ops *ops,
+			 const char *clkctrl_name)
+{
+	struct clk_init_data init = { NULL };
+	struct clk *clk;
+	struct omap_clkctrl_clk *clkctrl_clk;
+	int ret = 0;
+
+	init.name = clkctrl_get_clock_name(node, clkctrl_name, offset, bit,
+					   ti_clk_get_features()->flags &
+					   TI_CLK_CLKCTRL_COMPAT);
+
+	clkctrl_clk = kzalloc_obj(*clkctrl_clk);
+	if (!init.name || !clkctrl_clk) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	clk_hw->init = &init;
+	init.parent_names = parents;
+	init.num_parents = num_parents;
+	init.ops = ops;
+	init.flags = 0;
+
+	clk = of_ti_clk_register(node, clk_hw, init.name);
+	if (IS_ERR_OR_NULL(clk)) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	clkctrl_clk->reg_offset = offset;
+	clkctrl_clk->bit_offset = bit;
+	clkctrl_clk->clk = clk_hw;
+
+	list_add(&clkctrl_clk->node, &provider->clocks);
+
+	return 0;
+
+cleanup:
+	kfree(init.name);
+	kfree(clkctrl_clk);
+	return ret;
+}
+
+static void __init
+_ti_clkctrl_setup_gate(struct omap_clkctrl_provider *provider,
+		       struct device_node *node, u16 offset,
+		       const struct omap_clkctrl_bit_data *data,
+		       void __iomem *reg, const char *clkctrl_name)
+{
+	struct clk_hw_omap *clk_hw;
+
+	clk_hw = kzalloc_obj(*clk_hw);
+	if (!clk_hw)
+		return;
+
+	clk_hw->enable_bit = data->bit;
+	clk_hw->enable_reg.ptr = reg;
+
+	if (_ti_clkctrl_clk_register(provider, node, &clk_hw->hw, offset,
+				     data->bit, data->parents, 1,
+				     &omap_gate_clk_ops, clkctrl_name))
+		kfree(clk_hw);
+}
+
+static void __init
+_ti_clkctrl_setup_mux(struct omap_clkctrl_provider *provider,
+		      struct device_node *node, u16 offset,
+		      const struct omap_clkctrl_bit_data *data,
+		      void __iomem *reg, const char *clkctrl_name)
+{
+	struct clk_omap_mux *mux;
+	int num_parents = 0;
+	const char * const *pname;
+
+	mux = kzalloc_obj(*mux);
+	if (!mux)
+		return;
+
+	pname = data->parents;
+	while (*pname) {
+		num_parents++;
+		pname++;
+	}
+
+	mux->mask = num_parents;
+	if (!(mux->flags & CLK_MUX_INDEX_ONE))
+		mux->mask--;
+
+	mux->mask = (1 << fls(mux->mask)) - 1;
+
+	mux->shift = data->bit;
+	mux->reg.ptr = reg;
+
+	if (_ti_clkctrl_clk_register(provider, node, &mux->hw, offset,
+				     data->bit, data->parents, num_parents,
+				     &ti_clk_mux_ops, clkctrl_name))
+		kfree(mux);
+}
+
+static void __init
+_ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
+		      struct device_node *node, u16 offset,
+		      const struct omap_clkctrl_bit_data *data,
+		      void __iomem *reg, const char *clkctrl_name)
+{
+	struct clk_omap_divider *div;
+	const struct omap_clkctrl_div_data *div_data = data->data;
+	u8 div_flags = 0;
+
+	div = kzalloc_obj(*div);
+	if (!div)
+		return;
+
+	div->reg.ptr = reg;
+	div->shift = data->bit;
+	div->flags = div_data->flags;
+
+	if (div->flags & CLK_DIVIDER_POWER_OF_TWO)
+		div_flags |= CLKF_INDEX_POWER_OF_TWO;
+
+	if (ti_clk_parse_divider_data((int *)div_data->dividers, 0,
+				      div_data->max_div, div_flags,
+				      div)) {
+		pr_err("%s: Data parsing for %pOF:%04x:%d failed\n", __func__,
+		       node, offset, data->bit);
+		kfree(div);
+		return;
+	}
+
+	if (_ti_clkctrl_clk_register(provider, node, &div->hw, offset,
+				     data->bit, data->parents, 1,
+				     &ti_clk_divider_ops, clkctrl_name))
+		kfree(div);
+}
+
+static void __init
+_ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
+			  struct device_node *node,
+			  const struct omap_clkctrl_reg_data *data,
+			  void __iomem *reg, const char *clkctrl_name)
+{
+	const struct omap_clkctrl_bit_data *bits = data->bit_data;
+
+	if (!bits)
+		return;
+
+	while (bits->bit) {
+		switch (bits->type) {
+		case TI_CLK_GATE:
+			_ti_clkctrl_setup_gate(provider, node, data->offset,
+					       bits, reg, clkctrl_name);
+			break;
+
+		case TI_CLK_DIVIDER:
+			_ti_clkctrl_setup_div(provider, node, data->offset,
+					      bits, reg, clkctrl_name);
+			break;
+
+		case TI_CLK_MUX:
+			_ti_clkctrl_setup_mux(provider, node, data->offset,
+					      bits, reg, clkctrl_name);
+			break;
+
+		default:
+			pr_err("%s: bad subclk type: %d\n", __func__,
+			       bits->type);
+			return;
+		}
+		bits++;
+	}
+}
+
+static void __init _clkctrl_add_provider(void *data,
+					 struct device_node *np)
+{
+	of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data);
+}
+
+/*
+ * Get clock name based on "clock-output-names" property or the
+ * compatible property for clkctrl.
+ */
+static const char * __init clkctrl_get_name(struct device_node *np)
+{
+	struct property *prop;
+	const int prefix_len = 11;
+	const char *compat;
+	const char *output;
+	const char *end;
+	char *name;
+
+	if (!of_property_read_string_index(np, "clock-output-names", 0,
+					   &output)) {
+		int len;
+
+		len = strlen(output);
+		end = strstr(output, "_clkctrl");
+		if (end)
+			len -= strlen(end);
+		name = kstrndup(output, len, GFP_KERNEL);
+
+		return name;
+	}
+
+	of_property_for_each_string(np, "compatible", prop, compat) {
+		if (!strncmp("ti,clkctrl-", compat, prefix_len)) {
+			end = compat + prefix_len;
+			/* Two letter minimum name length for l3, l4 etc */
+			if (strnlen(end, 16) < 2)
+				continue;
+			name = kstrdup_and_replace(end, '-', '_', GFP_KERNEL);
+			if (!name)
+				continue;
+
+			return name;
+		}
+	}
+
+	return NULL;
+}
+
+static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
+{
+	struct omap_clkctrl_provider *provider;
+	const struct omap_clkctrl_data *data = default_clkctrl_data;
+	const struct omap_clkctrl_reg_data *reg_data;
+	struct clk_init_data init = { NULL };
+	struct clk_hw_omap *hw;
+	struct clk *clk;
+	struct omap_clkctrl_clk *clkctrl_clk = NULL;
+	bool legacy_naming;
+	const char *clkctrl_name;
+	u32 addr;
+	int ret;
+	char *c;
+	u16 soc_mask = 0;
+	struct resource res;
+
+	of_address_to_resource(node, 0, &res);
+	addr = (u32)res.start;
+
+#ifdef CONFIG_ARCH_OMAP4
+	if (of_machine_is_compatible("ti,omap4"))
+		data = omap4_clkctrl_data;
+#endif
+#ifdef CONFIG_SOC_OMAP5
+	if (of_machine_is_compatible("ti,omap5"))
+		data = omap5_clkctrl_data;
+#endif
+#ifdef CONFIG_SOC_DRA7XX
+	if (of_machine_is_compatible("ti,dra7"))
+		data = dra7_clkctrl_data;
+	if (of_machine_is_compatible("ti,dra72"))
+		soc_mask = CLKF_SOC_DRA72;
+	if (of_machine_is_compatible("ti,dra74"))
+		soc_mask = CLKF_SOC_DRA74;
+	if (of_machine_is_compatible("ti,dra76"))
+		soc_mask = CLKF_SOC_DRA76;
+#endif
+#ifdef CONFIG_SOC_AM33XX
+	if (of_machine_is_compatible("ti,am33xx"))
+		data = am3_clkctrl_data;
+#endif
+#ifdef CONFIG_SOC_AM43XX
+	if (of_machine_is_compatible("ti,am4372"))
+		data = am4_clkctrl_data;
+
+	if (of_machine_is_compatible("ti,am438x"))
+		data = am438x_clkctrl_data;
+#endif
+#ifdef CONFIG_SOC_TI81XX
+	if (of_machine_is_compatible("ti,dm814"))
+		data = dm814_clkctrl_data;
+
+	if (of_machine_is_compatible("ti,dm816"))
+		data = dm816_clkctrl_data;
+#endif
+
+	if (ti_clk_get_features()->flags & TI_CLK_DEVICE_TYPE_GP)
+		soc_mask |= CLKF_SOC_NONSEC;
+
+	while (data->addr) {
+		if (addr == data->addr)
+			break;
+
+		data++;
+	}
+
+	if (!data->addr) {
+		pr_err("%pOF not found from clkctrl data.\n", node);
+		return;
+	}
+
+	provider = kzalloc_obj(*provider);
+	if (!provider)
+		return;
+
+	provider->base = of_iomap(node, 0);
+
+	legacy_naming = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT;
+	clkctrl_name = clkctrl_get_name(node);
+	if (clkctrl_name) {
+		provider->clkdm_name = kasprintf(GFP_KERNEL,
+						 "%s_clkdm", clkctrl_name);
+		if (!provider->clkdm_name) {
+			kfree(provider);
+			return;
+		}
+		goto clkdm_found;
+	}
+
+	/*
+	 * The code below can be removed when all clkctrl nodes use domain
+	 * specific compatible property and standard clock node naming
+	 */
+	if (legacy_naming) {
+		provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFnxxx", node->parent);
+		if (!provider->clkdm_name) {
+			kfree(provider);
+			return;
+		}
+
+		/*
+		 * Create default clkdm name, replace _cm from end of parent
+		 * node name with _clkdm
+		 */
+		provider->clkdm_name[strlen(provider->clkdm_name) - 2] = 0;
+	} else {
+		provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFn", node);
+		if (!provider->clkdm_name) {
+			kfree(provider);
+			return;
+		}
+
+		/*
+		 * Create default clkdm name, replace _clkctrl from end of
+		 * node name with _clkdm
+		 */
+		provider->clkdm_name[strlen(provider->clkdm_name) - 7] = 0;
+	}
+
+	strcat(provider->clkdm_name, "clkdm");
+
+	/* Replace any dash from the clkdm name with underscore */
+	c = provider->clkdm_name;
+
+	while (*c) {
+		if (*c == '-')
+			*c = '_';
+		c++;
+	}
+clkdm_found:
+	INIT_LIST_HEAD(&provider->clocks);
+
+	/* Generate clocks */
+	reg_data = data->regs;
+
+	while (reg_data->parent) {
+		if ((reg_data->flags & CLKF_SOC_MASK) &&
+		    (reg_data->flags & soc_mask) == 0) {
+			reg_data++;
+			continue;
+		}
+
+		hw = kzalloc_obj(*hw);
+		if (!hw)
+			return;
+
+		hw->enable_reg.ptr = provider->base + reg_data->offset;
+
+		_ti_clkctrl_setup_subclks(provider, node, reg_data,
+					  hw->enable_reg.ptr, clkctrl_name);
+
+		if (reg_data->flags & CLKF_SW_SUP)
+			hw->enable_bit = MODULEMODE_SWCTRL;
+		if (reg_data->flags & CLKF_HW_SUP)
+			hw->enable_bit = MODULEMODE_HWCTRL;
+		if (reg_data->flags & CLKF_NO_IDLEST)
+			set_bit(NO_IDLEST, &hw->flags);
+
+		if (reg_data->clkdm_name)
+			hw->clkdm_name = reg_data->clkdm_name;
+		else
+			hw->clkdm_name = provider->clkdm_name;
+
+		init.parent_names = &reg_data->parent;
+		init.num_parents = 1;
+		init.flags = 0;
+		if (reg_data->flags & CLKF_SET_RATE_PARENT)
+			init.flags |= CLK_SET_RATE_PARENT;
+
+		init.name = clkctrl_get_clock_name(node, clkctrl_name,
+						   reg_data->offset, 0,
+						   legacy_naming);
+		if (!init.name)
+			goto cleanup;
+
+		clkctrl_clk = kzalloc_obj(*clkctrl_clk);
+		if (!clkctrl_clk)
+			goto cleanup;
+
+		init.ops = &omap4_clkctrl_clk_ops;
+		hw->hw.init = &init;
+
+		clk = of_ti_clk_register_omap_hw(node, &hw->hw, init.name);
+		if (IS_ERR_OR_NULL(clk))
+			goto cleanup;
+
+		clkctrl_clk->reg_offset = reg_data->offset;
+		clkctrl_clk->clk = &hw->hw;
+
+		list_add(&clkctrl_clk->node, &provider->clocks);
+
+		reg_data++;
+	}
+
+	ret = of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
+	if (ret == -EPROBE_DEFER)
+		ti_clk_retry_init(node, provider, _clkctrl_add_provider);
+
+	kfree(clkctrl_name);
+
+	return;
+
+cleanup:
+	kfree(hw);
+	kfree(init.name);
+	kfree(clkctrl_name);
+	kfree(clkctrl_clk);
+}
+CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl",
+	       _ti_omap4_clkctrl_setup);
+
+/**
+ * ti_clk_is_in_standby - Check if clkctrl clock is in standby or not
+ * @clk: clock to check standby status for
+ *
+ * Finds whether the provided clock is in standby mode or not. Returns
+ * true if the provided clock is a clkctrl type clock and it is in standby,
+ * false otherwise.
+ */
+bool ti_clk_is_in_standby(struct clk *clk)
+{
+	struct clk_hw *hw;
+	struct clk_hw_omap *hwclk;
+	u32 val;
+
+	hw = __clk_get_hw(clk);
+
+	if (!omap2_clk_is_hw_omap(hw))
+		return false;
+
+	hwclk = to_clk_hw_omap(hw);
+
+	val = ti_clk_ll_ops->clk_readl(&hwclk->enable_reg);
+
+	if (val & OMAP4_STBYST_MASK)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(ti_clk_is_in_standby);