Message-Id: <1515377863-20358-3-git-send-email-david@lechnology.com>
Date:   Sun,  7 Jan 2018 20:17:01 -0600
From:   David Lechner <david@...hnology.com>
To:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Adam Ford <aford173@...il.com>, linux-kernel@...r.kernel.org,
        David Lechner <david@...hnology.com>
Subject: [PATCH v5 02/44] clk: davinci: New driver for davinci PLL clocks

This adds a new driver for mach-davinci PLL clocks. This is porting the
code from arch/arm/mach-davinci/clock.c to the common clock framework.
Additionally, it adds device tree support for these clocks.

The ifeq ($(CONFIG_COMMON_CLK), y) in the Makefile is needed to prevent
compile errors until the clock code in arch/arm/mach-davinci is removed.

Note: although there are similar clocks for TI Keystone we are not able
to share the code for a few reasons. The keystone clocks are device tree
only and use legacy one-node-per-clock bindings. Also the register
layouts are a bit different, which would add even more if/else mess
to the keystone clocks. And the keystone PLL driver doesn't support
setting clock rates.

Signed-off-by: David Lechner <david@...hnology.com>
---
 MAINTAINERS                  |   6 +
 drivers/clk/Makefile         |   1 +
 drivers/clk/davinci/Makefile |   5 +
 drivers/clk/davinci/pll.c    | 564 +++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/davinci/pll.h    |  61 +++++
 5 files changed, 637 insertions(+)
 create mode 100644 drivers/clk/davinci/Makefile
 create mode 100644 drivers/clk/davinci/pll.c
 create mode 100644 drivers/clk/davinci/pll.h

diff --git a/MAINTAINERS b/MAINTAINERS
index a6e86e2..1db0cf0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13554,6 +13554,12 @@ F:	arch/arm/mach-davinci/
 F:	drivers/i2c/busses/i2c-davinci.c
 F:	arch/arm/boot/dts/da850*
 
+TI DAVINCI SERIES CLOCK DRIVER
+M:	David Lechner <david@...hnology.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/clock/ti/davinci/
+F:	drivers/clk/davinci/
+
 TI DAVINCI SERIES GPIO DRIVER
 M:	Keerthy <j-keerthy@...com>
 L:	linux-gpio@...r.kernel.org
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f7f761b..c865fd0 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_ARCH_ARTPEC)		+= axis/
 obj-$(CONFIG_ARC_PLAT_AXS10X)		+= axs10x/
 obj-y					+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
+obj-$(CONFIG_ARCH_DAVINCI)		+= davinci/
 obj-$(CONFIG_H8300)			+= h8300/
 obj-$(CONFIG_ARCH_HISI)			+= hisilicon/
 obj-y					+= imgtec/
diff --git a/drivers/clk/davinci/Makefile b/drivers/clk/davinci/Makefile
new file mode 100644
index 0000000..d9673bd
--- /dev/null
+++ b/drivers/clk/davinci/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+ifeq ($(CONFIG_COMMON_CLK), y)
+obj-y += pll.o
+endif
diff --git a/drivers/clk/davinci/pll.c b/drivers/clk/davinci/pll.c
new file mode 100644
index 0000000..46f9c18
--- /dev/null
+++ b/drivers/clk/davinci/pll.c
@@ -0,0 +1,564 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PLL clock driver for TI Davinci SoCs
+ *
+ * Copyright (C) 2017 David Lechner <david@...hnology.com>
+ *
+ * Based on drivers/clk/keystone/pll.c
+ * Copyright (C) 2013 Texas Instruments Inc.
+ *	Murali Karicheri <m-karicheri2@...com>
+ *	Santosh Shilimkar <santosh.shilimkar@...com>
+ *
+ * And on arch/arm/mach-davinci/clock.c
+ * Copyright (C) 2006-2007 Texas Instruments.
+ * Copyright (C) 2008-2009 Deep Root Systems, LLC
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include "pll.h"
+
+#define REVID		0x000
+#define PLLCTL		0x100
+#define OCSEL		0x104
+#define PLLSECCTL	0x108
+#define PLLM		0x110
+#define PREDIV		0x114
+#define PLLDIV1		0x118
+#define PLLDIV2		0x11c
+#define PLLDIV3		0x120
+#define OSCDIV		0x124
+#define POSTDIV		0x128
+#define BPDIV		0x12c
+#define PLLCMD		0x138
+#define PLLSTAT		0x13c
+#define ALNCTL		0x140
+#define DCHANGE		0x144
+#define CKEN		0x148
+#define CKSTAT		0x14c
+#define SYSTAT		0x150
+#define PLLDIV4		0x160
+#define PLLDIV5		0x164
+#define PLLDIV6		0x168
+#define PLLDIV7		0x16c
+#define PLLDIV8		0x170
+#define PLLDIV9		0x174
+
+#define PLLCTL_PLLEN	BIT(0)
+#define PLLCTL_PLLPWRDN	BIT(1)
+#define PLLCTL_PLLRST	BIT(3)
+#define PLLCTL_PLLDIS	BIT(4)
+#define PLLCTL_PLLENSRC	BIT(5)
+#define PLLCTL_CLKMODE	BIT(8)
+
+#define PLLM_MASK		0x1f
+#define PREDIV_RATIO_MASK	0x1f
+#define PREDIV_PREDEN		BIT(15)
+#define PLLDIV_RATIO_WIDTH	5
+#define PLLDIV_ENABLE_SHIFT	15
+#define OSCDIV_RATIO_WIDTH	5
+#define POSTDIV_RATIO_MASK	0x1f
+#define POSTDIV_POSTDEN		BIT(15)
+#define BPDIV_RATIO_SHIFT	0
+#define BPDIV_RATIO_WIDTH	5
+#define CKEN_OBSCLK_SHIFT	1
+#define CKEN_AUXEN_SHIFT	0
+
+/*
+ * OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN
+ * cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us
+ * ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input
+ * is ~25MHz. Units are micro seconds.
+ */
+#define PLL_BYPASS_TIME		1
+/* From OMAP-L138 datasheet table 6-4. Units are micro seconds */
+#define PLL_RESET_TIME		1
+/*
+ * From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4
+ * Units are micro seconds.
+ */
+#define PLL_LOCK_TIME		20
+
+/**
+ * struct davinci_pll_clk - Main PLL clock
+ * @hw: clk_hw for the pll
+ * @base: Base memory address
+ * @parent_rate: Saved parent rate used by some child clocks
+ */
+struct davinci_pll_clk {
+	struct clk_hw hw;
+	void __iomem *base;
+};
+
+#define to_davinci_pll_clk(_hw) container_of((_hw), struct davinci_pll_clk, hw)
+
+static unsigned long davinci_pll_clk_recalc(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+	unsigned long rate = parent_rate;
+	u32 prediv, mult, postdiv;
+
+	prediv = readl(pll->base + PREDIV) & PREDIV_RATIO_MASK;
+	mult = readl(pll->base + PLLM) & PLLM_MASK;
+	postdiv = readl(pll->base + POSTDIV) & POSTDIV_RATIO_MASK;
+
+	rate /= prediv + 1;
+	rate *= mult + 1;
+	rate /= postdiv + 1;
+
+	return rate;
+}
+
+/**
+ * davinci_pll_get_best_rate - Calculate PLL output closest to a given rate
+ * @rate: The target rate
+ * @parent_rate: The PLL input clock rate
+ * @mult: Pointer to hold the multiplier value (optional)
+ * @postdiv: Pointer to hold the postdiv value (optional)
+ *
+ * Returns: The closest rate less than or equal to @rate that the PLL can
+ * generate. @mult and @postdiv will contain the values required to generate
+ * that rate.
+ */
+static long davinci_pll_get_best_rate(u32 rate, u32 parent_rate, u32 *mult,
+				      u32 *postdiv)
+{
+	u32 r, m, d;
+	u32 best_rate = 0;
+	u32 best_mult = 0;
+	u32 best_postdiv = 0;
+
+	for (d = 1; d <= 4; d++) {
+		for (m = min(32U, rate * d / parent_rate); m > 0; m--) {
+			r = parent_rate * m / d;
+
+			if (r < best_rate)
+				break;
+
+			if (r > best_rate && r <= rate) {
+				best_rate = r;
+				best_mult = m;
+				best_postdiv = d;
+			}
+
+			if (best_rate == rate)
+				goto out;
+		}
+	}
+
+out:
+	if (mult)
+		*mult = best_mult;
+	if (postdiv)
+		*postdiv = best_postdiv;
+
+	return best_rate;
+}
+
+static long davinci_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long *parent_rate)
+{
+	return davinci_pll_get_best_rate(rate, *parent_rate, NULL, NULL);
+}
+
+/**
+ * __davinci_pll_set_rate - set the output rate of a given PLL.
+ *
+ * Note: Currently tested to work with OMAP-L138 only.
+ *
+ * @pll: pll whose rate needs to be changed.
+ * @prediv: The pre divider value. Passing 0 disables the pre-divider.
+ * @pllm: The multiplier value. Passing 0 leads to multiply-by-one.
+ * @postdiv: The post divider value. Passing 0 disables the post-divider.
+ */
+static void __davinci_pll_set_rate(struct davinci_pll_clk *pll, u32 prediv,
+				   u32 mult, u32 postdiv)
+{
+	u32 ctrl, locktime;
+
+	/*
+	 * PLL lock time required per OMAP-L138 datasheet is
+	 * (2000 * prediv)/sqrt(pllm) OSCIN cycles. We approximate sqrt(pllm)
+	 * as 4 and OSCIN cycle as 25 MHz.
+	 */
+	if (prediv) {
+		locktime = ((2000 * prediv) / 100);
+		prediv = (prediv - 1) | PREDIV_PREDEN;
+	} else {
+		locktime = PLL_LOCK_TIME;
+	}
+	if (postdiv)
+		postdiv = (postdiv - 1) | POSTDIV_POSTDEN;
+	if (mult)
+		mult = mult - 1;
+
+	ctrl = readl(pll->base + PLLCTL);
+
+	/* Switch the PLL to bypass mode */
+	ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
+	writel(ctrl, pll->base + PLLCTL);
+
+	udelay(PLL_BYPASS_TIME);
+
+	/* Reset and enable PLL */
+	ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS);
+	writel(ctrl, pll->base + PLLCTL);
+
+	writel(prediv, pll->base + PREDIV);
+	writel(mult, pll->base + PLLM);
+	writel(postdiv, pll->base + POSTDIV);
+
+	udelay(PLL_RESET_TIME);
+
+	/* Bring PLL out of reset */
+	ctrl |= PLLCTL_PLLRST;
+	writel(ctrl, pll->base + PLLCTL);
+
+	udelay(locktime);
+
+	/* Remove PLL from bypass mode */
+	ctrl |= PLLCTL_PLLEN;
+	writel(ctrl, pll->base + PLLCTL);
+}
+
+static int davinci_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+	u32 mult, postdiv;
+
+	davinci_pll_get_best_rate(rate, parent_rate, &mult, &postdiv);
+	__davinci_pll_set_rate(pll, 1, mult, postdiv);
+
+	return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+#define DEBUG_REG(n)	\
+{			\
+	.name	= #n,	\
+	.offset	= n,	\
+}
+
+static const struct debugfs_reg32 davinci_pll_regs[] = {
+	DEBUG_REG(REVID),
+	DEBUG_REG(PLLCTL),
+	DEBUG_REG(OCSEL),
+	DEBUG_REG(PLLSECCTL),
+	DEBUG_REG(PLLM),
+	DEBUG_REG(PREDIV),
+	DEBUG_REG(PLLDIV1),
+	DEBUG_REG(PLLDIV2),
+	DEBUG_REG(PLLDIV3),
+	DEBUG_REG(OSCDIV),
+	DEBUG_REG(POSTDIV),
+	DEBUG_REG(BPDIV),
+	DEBUG_REG(PLLCMD),
+	DEBUG_REG(PLLSTAT),
+	DEBUG_REG(ALNCTL),
+	DEBUG_REG(DCHANGE),
+	DEBUG_REG(CKEN),
+	DEBUG_REG(CKSTAT),
+	DEBUG_REG(SYSTAT),
+	DEBUG_REG(PLLDIV4),
+	DEBUG_REG(PLLDIV5),
+	DEBUG_REG(PLLDIV6),
+	DEBUG_REG(PLLDIV7),
+	DEBUG_REG(PLLDIV8),
+	DEBUG_REG(PLLDIV9),
+};
+
+static int davinci_pll_debug_init(struct clk_hw *hw, struct dentry *dentry)
+{
+	struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+	struct debugfs_regset32 *regset;
+	struct dentry *d;
+
+	regset = kzalloc(sizeof(regset), GFP_KERNEL);
+	if (!regset)
+		return -ENOMEM;
+
+	regset->regs = davinci_pll_regs;
+	regset->nregs = ARRAY_SIZE(davinci_pll_regs);
+	regset->base = pll->base;
+
+	d = debugfs_create_regset32("registers", 0400, dentry, regset);
+	if (IS_ERR(d)) {
+		kfree(regset);
+		return PTR_ERR(d);
+	}
+
+	return 0;
+}
+#else
+#define davinci_pll_debug_init NULL
+#endif
+
+static const struct clk_ops davinci_pll_clk_ops = {
+	.recalc_rate	= davinci_pll_clk_recalc,
+	.round_rate	= davinci_pll_round_rate,
+	.set_rate	= davinci_pll_set_rate,
+	.debug_init	= davinci_pll_debug_init,
+};
+
+/**
+ * davinci_pll_clk_register - Register a PLL clock
+ * @name: The clock name
+ * @parent_name: The parent clock name
+ * @base: The PLL's memory region
+ */
+struct clk *davinci_pll_clk_register(const char *name,
+				     const char *parent_name,
+				     void __iomem *base)
+{
+	struct clk_init_data init;
+	struct davinci_pll_clk *pll;
+	struct clk *clk;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &davinci_pll_clk_ops;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	init.flags = 0;
+
+	pll->base = base;
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (IS_ERR(clk))
+		kfree(pll);
+
+	return clk;
+}
+
+struct davinci_pll_aux_clk {
+	struct clk_hw hw;
+	struct davinci_pll_clk *pll;
+};
+
+/**
+ * davinci_pll_aux_clk_register - Register bypass clock (AUXCLK)
+ * @name: The clock name
+ * @parent_name: The parent clock name (usually "ref_clk" since this bypasses
+ *               the PLL)
+ * @base: The PLL memory region
+ */
+struct clk *davinci_pll_aux_clk_register(const char *name,
+					 const char *parent_name,
+					 void __iomem *base)
+{
+	return clk_register_gate(NULL, name, parent_name, 0, base + CKEN,
+				 CKEN_AUXEN_SHIFT, 0, NULL);
+}
+
+/**
+ * davinci_pll_bpdiv_clk_register - Register bypass divider clock (SYSCLKBP)
+ * @name: The clock name
+ * @parent_name: The parent clock name (usually "ref_clk" since this bypasses
+ *               the PLL)
+ * @base: The PLL memory region
+ */
+struct clk *davinci_pll_bpdiv_clk_register(const char *name,
+					   const char *parent_name,
+					   void __iomem *base)
+{
+	return clk_register_divider(NULL, name, parent_name, 0, base + BPDIV,
+				    BPDIV_RATIO_SHIFT, BPDIV_RATIO_WIDTH,
+				    CLK_DIVIDER_READ_ONLY, NULL);
+}
+
+/**
+ * davinci_pll_obs_clk_register - Register oscillator divider clock (OBSCLK)
+ * @name: The clock name
+ * @parent_names: The parent clock names
+ * @num_parents: The number of paren clocks
+ * @base: The PLL memory region
+ * @table: A table of values cooresponding to the parent clocks (see OCSEL
+ *         register in SRM for values)
+ */
+struct clk *davinci_pll_obs_clk_register(const char *name,
+					 const char * const *parent_names,
+					 u8 num_parents,
+					 void __iomem *base,
+					 u32 *table)
+{
+	struct clk_mux *mux;
+	struct clk_gate *gate;
+	struct clk_divider *divider;
+	struct clk *clk;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		return ERR_PTR(-ENOMEM);
+
+	mux->reg = base + OCSEL;
+	mux->table = table;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate) {
+		kfree(mux);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	gate->reg = base + CKEN;
+	gate->bit_idx = CKEN_OBSCLK_SHIFT;
+
+	divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+	if (!divider) {
+		kfree(gate);
+		kfree(mux);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	divider->reg = base + OSCDIV;
+	divider->width = OSCDIV_RATIO_WIDTH;
+
+	clk = clk_register_composite(NULL, name, parent_names, num_parents,
+				     &mux->hw, &clk_mux_ops,
+				     &divider->hw, &clk_divider_ops,
+				     &gate->hw, &clk_gate_ops, 0);
+	if (IS_ERR(clk)) {
+		kfree(divider);
+		kfree(gate);
+		kfree(mux);
+	}
+
+	return clk;
+}
+
+struct clk *
+davinci_pll_divclk_register(const struct davinci_pll_divclk_info *info,
+			    void __iomem *base)
+{
+	const struct clk_ops *divider_ops = &clk_divider_ops;
+	struct clk_gate *gate;
+	struct clk_divider *divider;
+	struct clk *clk;
+	u32 reg;
+	u32 flags = 0;
+
+	/* PLLDIVn registers are not entirely consecutive */
+	if (info->id < 4)
+		reg = PLLDIV1 + 4 * (info->id - 1);
+	else
+		reg = PLLDIV4 + 4 * (info->id - 4);
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	gate->reg = base + reg;
+	gate->bit_idx = PLLDIV_ENABLE_SHIFT;
+
+	divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+	if (!divider) {
+		kfree(gate);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	divider->reg = base + reg;
+	divider->width = PLLDIV_RATIO_WIDTH;
+	divider->flags = 0;
+
+	if (info->flags & DIVCLK_FIXED_DIV) {
+		flags |= CLK_DIVIDER_READ_ONLY;
+		divider_ops = &clk_divider_ro_ops;
+	}
+
+	/* Only the ARM clock can change the parent PLL rate */
+	if (info->flags & DIVCLK_ARM_RATE)
+		flags |= CLK_SET_RATE_PARENT;
+
+	if (info->flags & DIVCLK_ALWAYS_ENABLED)
+		flags |= CLK_IS_CRITICAL;
+
+	clk = clk_register_composite(NULL, info->name, &info->parent_name, 1,
+				     NULL, NULL, &divider->hw, divider_ops,
+				     &gate->hw, &clk_gate_ops, flags);
+	if (IS_ERR(clk)) {
+		kfree(divider);
+		kfree(gate);
+	}
+
+	return clk;
+}
+
+#ifdef CONFIG_OF
+#define MAX_NAME_SIZE 20
+
+void of_davinci_pll_init(struct device_node *node, const char *name,
+			 const struct davinci_pll_divclk_info *info,
+			 u8 max_divclk_id)
+{
+	struct device_node *child;
+	const char *parent_name;
+	void __iomem *base;
+	struct clk *clk;
+
+	base = of_iomap(node, 0);
+	if (!base) {
+		pr_err("%s: ioremap failed\n", __func__);
+		return;
+	}
+
+	parent_name = of_clk_get_parent_name(node, 0);
+
+	clk = davinci_pll_clk_register(name, parent_name, base);
+	if (IS_ERR(clk)) {
+		pr_err("%s: failed to register %s (%ld)\n", __func__, name,
+		       PTR_ERR(clk));
+		return;
+	}
+
+	child = of_get_child_by_name(node, "sysclk");
+	if (child && of_device_is_available(child)) {
+		struct clk_onecell_data *clk_data;
+
+		clk_data = clk_alloc_onecell_data(max_divclk_id + 1);
+		if (!clk_data) {
+			pr_err("%s: out of memory\n", __func__);
+			return;
+		}
+
+		for (; info->name; info++) {
+			clk = davinci_pll_divclk_register(info, base);
+			if (IS_ERR(clk))
+				pr_warn("%s: failed to register %s (%ld)\n",
+					__func__, info->name, PTR_ERR(clk));
+			else
+				clk_data->clks[info->id] = clk;
+		}
+		of_clk_add_provider(child, of_clk_src_onecell_get, clk_data);
+	}
+	of_node_put(child);
+
+	child = of_get_child_by_name(node, "auxclk");
+	if (child && of_device_is_available(child)) {
+		char child_name[MAX_NAME_SIZE];
+
+		snprintf(child_name, MAX_NAME_SIZE, "%s_aux_clk", name);
+
+		clk = davinci_pll_aux_clk_register(child_name, parent_name, base);
+		if (IS_ERR(clk))
+			pr_warn("%s: failed to register %s (%ld)\n", __func__,
+				child_name, PTR_ERR(clk));
+		else
+			of_clk_add_provider(child, of_clk_src_simple_get, clk);
+	}
+	of_node_put(child);
+}
+#endif
diff --git a/drivers/clk/davinci/pll.h b/drivers/clk/davinci/pll.h
new file mode 100644
index 0000000..259678b
--- /dev/null
+++ b/drivers/clk/davinci/pll.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Clock driver for TI Davinci PSC controllers
+ *
+ * Copyright (C) 2017 David Lechner <david@...hnology.com>
+ */
+
+#ifndef __CLK_DAVINCI_PLL_H___
+#define __CLK_DAVINCI_PLL_H___
+
+#include <linux/bitops.h>
+#include <linux/types.h>
+
+#define DIVCLK_ARM_RATE		BIT(0) /* Controls ARM rate */
+#define DIVCLK_FIXED_DIV	BIT(1) /* Fixed divider */
+#define DIVCLK_ALWAYS_ENABLED	BIT(2) /* Or bad things happen */
+
+struct davinci_pll_divclk_info {
+	const char *name;
+	const char *parent_name;
+	u32 id;
+	u32 flags;
+};
+
+#define DIVCLK(i, n, p, f)	\
+{				\
+	.name		= #n,	\
+	.parent_name	= #p,	\
+	.id		= (i),	\
+	.flags		= (f),	\
+}
+
+struct clk;
+
+struct clk *davinci_pll_clk_register(const char *name,
+				     const char *parent_name,
+				     void __iomem *base);
+struct clk *davinci_pll_aux_clk_register(const char *name,
+					 const char *parent_name,
+					 void __iomem *base);
+struct clk *davinci_pll_bpdiv_clk_register(const char *name,
+					   const char *parent_name,
+					   void __iomem *base);
+struct clk *davinci_pll_obs_clk_register(const char *name,
+					 const char * const *parent_names,
+					 u8 num_parents,
+					 void __iomem *base,
+					 u32 *table);
+struct clk *
+davinci_pll_divclk_register(const struct davinci_pll_divclk_info *info,
+			    void __iomem *base);
+
+#ifdef CONFIG_OF
+struct device_node;
+
+void of_davinci_pll_init(struct device_node *node, const char *name,
+			 const struct davinci_pll_divclk_info *info,
+			 u8 max_divclk_id);
+#endif
+
+#endif /* __CLK_DAVINCI_PLL_H___ */
-- 
2.7.4

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