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* [PATCH v2] clk: TI CDCE706 clock synthesizer driver
@ 2015-01-12  7:20 Max Filippov
       [not found] ` <1421047246-15890-1-git-send-email-jcmvbkbc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
  0 siblings, 1 reply; 2+ messages in thread
From: Max Filippov @ 2015-01-12  7:20 UTC (permalink / raw)
  To: linux-kernel, devicetree, Mike Turquette
  Cc: Stephen Boyd, Rob Herring, Pawel Moll, Mark Rutland, Ian Campbell,
	Kumar Gala, Grant Likely, Max Filippov

The driver allows using CDCE706 in its default configuration recorded in
EEPROM and adjusting of synthesized clocks by consumers.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
Changes v1->v2:
- add example usage to devicetree binding doc.

 .../devicetree/bindings/clock/ti,cdce706.txt       |  42 ++
 MAINTAINERS                                        |   5 +
 drivers/clk/Kconfig                                |   8 +
 drivers/clk/Makefile                               |   1 +
 drivers/clk/clk-cdce706.c                          | 700 +++++++++++++++++++++
 5 files changed, 756 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/ti,cdce706.txt
 create mode 100644 drivers/clk/clk-cdce706.c

diff --git a/Documentation/devicetree/bindings/clock/ti,cdce706.txt b/Documentation/devicetree/bindings/clock/ti,cdce706.txt
new file mode 100644
index 0000000..616836e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti,cdce706.txt
@@ -0,0 +1,42 @@
+Bindings for Texas Instruments CDCE706 programmable 3-PLL clock
+synthesizer/multiplier/divider.
+
+Reference: http://www.ti.com/lit/ds/symlink/cdce706.pdf
+
+I2C device node required properties:
+- compatible: shall be "ti,cdce706".
+- reg: i2c device address, shall be in range [0x68...0x6b].
+- #clock-cells: from common clock binding; shall be set to 1.
+- clocks: from common clock binding; list of parent clock
+  handles, shall be reference clock(s) connected to CLK_IN0
+  and CLK_IN1 pins.
+- clock-names: shall be clk_in0 and/or clk_in1. Use clk_in0
+  in case of crystal oscillator or differential signal input
+  configuration. Use clk_in0 and clk_in1 in case of independent
+  single-ended LVCMOS inputs configuration.
+
+Example:
+
+	clocks {
+		clk54: clk54 {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <54000000>;
+		};
+	};
+	...
+	i2c0: i2c-master@0d090000 {
+		...
+		cdce706: clock-synth@69 {
+			compatible = "ti,cdce706";
+			#clock-cells = <1>;
+			reg = <0x69>;
+			clocks = <&clk54>;
+			clock-names = "clk_in0";
+		};
+	};
+	...
+	simple-audio-card,codec {
+		...
+		clocks = <&cdce706 4>;
+	};
diff --git a/MAINTAINERS b/MAINTAINERS
index f1eb40f..923d9b3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9536,6 +9536,11 @@ L:	linux-pm@vger.kernel.org
 S:	Supported
 F:	drivers/thermal/ti-soc-thermal/
 
+TI CDCE706 CLOCK DRIVER
+M:	Max Filippov <jcmvbkbc@gmail.com>
+S:	Maintained
+F:	drivers/clk/clk-cdce706.c
+
 TI CLOCK DRIVER
 M:	Tero Kristo <t-kristo@ti.com>
 L:	linux-omap@vger.kernel.org
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 3f44f292..975af6a 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -134,6 +134,14 @@ config COMMON_CLK_PXA
 	---help---
 	  Sypport for the Marvell PXA SoC.
 
+config COMMON_CLK_CDCE706
+	tristate "Clock driver for TI CDCE706 clock synthesizer"
+	depends on I2C
+	select REGMAP_I2C
+	select RATIONAL
+	---help---
+	  This driver supports TI CDCE706 programmable 3-PLL clock synthesizer.
+
 source "drivers/clk/qcom/Kconfig"
 
 endmenu
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..929e11a 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -19,6 +19,7 @@ endif
 obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN)	+= clk-axi-clkgen.o
 obj-$(CONFIG_ARCH_AXXIA)		+= clk-axm5516.o
 obj-$(CONFIG_ARCH_BCM2835)		+= clk-bcm2835.o
+obj-$(CONFIG_COMMON_CLK_CDCE706)	+= clk-cdce706.o
 obj-$(CONFIG_ARCH_CLPS711X)		+= clk-clps711x.o
 obj-$(CONFIG_ARCH_EFM32)		+= clk-efm32gg.o
 obj-$(CONFIG_ARCH_HIGHBANK)		+= clk-highbank.o
diff --git a/drivers/clk/clk-cdce706.c b/drivers/clk/clk-cdce706.c
new file mode 100644
index 0000000..c386ad2
--- /dev/null
+++ b/drivers/clk/clk-cdce706.c
@@ -0,0 +1,700 @@
+/*
+ * TI CDCE706 programmable 3-PLL clock synthesizer driver
+ *
+ * Copyright (c) 2014 Cadence Design Systems Inc.
+ *
+ * Reference: http://www.ti.com/lit/ds/symlink/cdce706.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/rational.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define CDCE706_CLKIN_CLOCK		10
+#define CDCE706_CLKIN_SOURCE		11
+#define CDCE706_PLL_M_LOW(pll)		(1 + 3 * (pll))
+#define CDCE706_PLL_N_LOW(pll)		(2 + 3 * (pll))
+#define CDCE706_PLL_HI(pll)		(3 + 3 * (pll))
+#define CDCE706_PLL_MUX			3
+#define CDCE706_PLL_FVCO		6
+#define CDCE706_DIVIDER(div)		(13 + (div))
+#define CDCE706_CLKOUT(out)		(19 + (out))
+
+#define CDCE706_CLKIN_CLOCK_MASK	0x10
+#define CDCE706_CLKIN_SOURCE_SHIFT	6
+#define CDCE706_CLKIN_SOURCE_MASK	0xc0
+#define CDCE706_CLKIN_SOURCE_LVCMOS	0x40
+
+#define CDCE706_PLL_MUX_MASK(pll)	(0x80 >> (pll))
+#define CDCE706_PLL_LOW_M_MASK		0xff
+#define CDCE706_PLL_LOW_N_MASK		0xff
+#define CDCE706_PLL_HI_M_MASK		0x1
+#define CDCE706_PLL_HI_N_MASK		0x1e
+#define CDCE706_PLL_HI_N_SHIFT		1
+#define CDCE706_PLL_M_MAX		0x1ff
+#define CDCE706_PLL_N_MAX		0xfff
+#define CDCE706_PLL_FVCO_MASK(pll)	(0x80 >> (pll))
+#define CDCE706_PLL_FREQ_MIN		 80000000
+#define CDCE706_PLL_FREQ_MAX		300000000
+#define CDCE706_PLL_FREQ_HI		180000000
+
+#define CDCE706_DIVIDER_PLL(div)	(9 + (div) - ((div) > 2) - ((div) > 4))
+#define CDCE706_DIVIDER_PLL_SHIFT(div)	((div) < 2 ? 5 : 3 * ((div) & 1))
+#define CDCE706_DIVIDER_PLL_MASK(div)	(0x7 << CDCE706_DIVIDER_PLL_SHIFT(div))
+#define CDCE706_DIVIDER_DIVIDER_MASK	0x7f
+#define CDCE706_DIVIDER_DIVIDER_MAX	0x7f
+
+#define CDCE706_CLKOUT_DIVIDER_MASK	0x7
+#define CDCE706_CLKOUT_ENABLE_MASK	0x8
+
+static struct regmap_config cdce706_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.val_format_endian = REGMAP_ENDIAN_NATIVE,
+};
+
+#define to_hw_data(phw) (container_of((phw), struct cdce706_hw_data, hw))
+
+struct cdce706_hw_data {
+	struct cdce706_dev_data *dev_data;
+	unsigned idx;
+	unsigned parent;
+	struct clk *clk;
+	struct clk_hw hw;
+	unsigned div;
+	unsigned mul;
+	unsigned mux;
+};
+
+struct cdce706_dev_data {
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct clk_onecell_data onecell;
+	struct clk *clks[6];
+	struct clk *clkin_clk[2];
+	const char *clkin_name[2];
+	struct cdce706_hw_data clkin[1];
+	struct cdce706_hw_data pll[3];
+	struct cdce706_hw_data divider[6];
+	struct cdce706_hw_data clkout[6];
+};
+
+static const char * const cdce706_source_name[] = {
+	"clk_in0", "clk_in1",
+};
+
+static const char *cdce706_clkin_name[] = {
+	"clk_in",
+};
+
+static const char * const cdce706_pll_name[] = {
+	"pll1", "pll2", "pll3",
+};
+
+static const char *cdce706_divider_parent_name[] = {
+	"clk_in", "pll1", "pll2", "pll2", "pll3",
+};
+
+static const char *cdce706_divider_name[] = {
+	"p0", "p1", "p2", "p3", "p4", "p5",
+};
+
+static const char * const cdce706_clkout_name[] = {
+	"clk_out0", "clk_out1", "clk_out2", "clk_out3", "clk_out4", "clk_out5",
+};
+
+static int cdce706_reg_read(struct cdce706_dev_data *dev_data, unsigned reg,
+			    unsigned *val)
+{
+	int rc = regmap_read(dev_data->regmap, reg | 0x80, val);
+
+	if (rc < 0)
+		dev_err(&dev_data->client->dev, "error reading reg %u", reg);
+	return rc;
+}
+
+static int cdce706_reg_write(struct cdce706_dev_data *dev_data, unsigned reg,
+			     unsigned val)
+{
+	int rc = regmap_write(dev_data->regmap, reg | 0x80, val);
+
+	if (rc < 0)
+		dev_err(&dev_data->client->dev, "error writing reg %u", reg);
+	return rc;
+}
+
+static int cdce706_reg_update(struct cdce706_dev_data *dev_data, unsigned reg,
+			      unsigned mask, unsigned val)
+{
+	int rc = regmap_update_bits(dev_data->regmap, reg | 0x80, mask, val);
+
+	if (rc < 0)
+		dev_err(&dev_data->client->dev, "error updating reg %u", reg);
+	return rc;
+}
+
+static int cdce706_clkin_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	hwd->parent = index;
+	return 0;
+}
+
+static u8 cdce706_clkin_get_parent(struct clk_hw *hw)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	return hwd->parent;
+}
+
+static const struct clk_ops cdce706_clkin_ops = {
+	.set_parent = cdce706_clkin_set_parent,
+	.get_parent = cdce706_clkin_get_parent,
+};
+
+static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw,
+					     unsigned long parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, pll: %d, mux: %d, mul: %u, div: %u\n",
+		__func__, hwd->idx, hwd->mux, hwd->mul, hwd->div);
+
+	if (!hwd->mux) {
+		if (hwd->div && hwd->mul) {
+			u64 res = (u64)parent_rate * hwd->mul;
+
+			do_div(res, hwd->div);
+			return res;
+		}
+	} else {
+		if (hwd->div)
+			return parent_rate / hwd->div;
+	}
+	return 0;
+}
+
+static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long *parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+	unsigned long mul, div;
+	u64 res;
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, rate: %lu, parent_rate: %lu\n",
+		__func__, rate, *parent_rate);
+
+	rational_best_approximation(rate, *parent_rate,
+				    CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX,
+				    &mul, &div);
+	hwd->mul = mul;
+	hwd->div = div;
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, pll: %d, mul: %lu, div: %lu\n",
+		__func__, hwd->idx, mul, div);
+
+	res = (u64)*parent_rate * hwd->mul;
+	do_div(res, hwd->div);
+	return res;
+}
+
+static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+	unsigned long mul = hwd->mul, div = hwd->div;
+	int err;
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, pll: %d, mul: %lu, div: %lu\n",
+		__func__, hwd->idx, mul, div);
+
+	err = cdce706_reg_update(hwd->dev_data,
+				 CDCE706_PLL_HI(hwd->idx),
+				 CDCE706_PLL_HI_M_MASK | CDCE706_PLL_HI_N_MASK,
+				 ((div >> 8) & CDCE706_PLL_HI_M_MASK) |
+				 ((mul >> (8 - CDCE706_PLL_HI_N_SHIFT)) &
+				  CDCE706_PLL_HI_N_MASK));
+	if (err < 0)
+		return err;
+
+	err = cdce706_reg_write(hwd->dev_data,
+				CDCE706_PLL_M_LOW(hwd->idx),
+				div & CDCE706_PLL_LOW_M_MASK);
+	if (err < 0)
+		return err;
+
+	err = cdce706_reg_write(hwd->dev_data,
+				CDCE706_PLL_N_LOW(hwd->idx),
+				mul & CDCE706_PLL_LOW_N_MASK);
+	if (err < 0)
+		return err;
+
+	err = cdce706_reg_update(hwd->dev_data,
+				 CDCE706_PLL_FVCO,
+				 CDCE706_PLL_FVCO_MASK(hwd->idx),
+				 rate > CDCE706_PLL_FREQ_HI ?
+				 CDCE706_PLL_FVCO_MASK(hwd->idx) : 0);
+	return err;
+}
+
+static const struct clk_ops cdce706_pll_ops = {
+	.recalc_rate = cdce706_pll_recalc_rate,
+	.round_rate = cdce706_pll_round_rate,
+	.set_rate = cdce706_pll_set_rate,
+};
+
+static int cdce706_divider_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	if (hwd->parent == index)
+		return 0;
+	hwd->parent = index;
+	return cdce706_reg_update(hwd->dev_data,
+				  CDCE706_DIVIDER_PLL(hwd->idx),
+				  CDCE706_DIVIDER_PLL_MASK(hwd->idx),
+				  index << CDCE706_DIVIDER_PLL_SHIFT(hwd->idx));
+}
+
+static u8 cdce706_divider_get_parent(struct clk_hw *hw)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	return hwd->parent;
+}
+
+static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, divider: %d, div: %u\n",
+		__func__, hwd->idx, hwd->div);
+	if (hwd->div)
+		return parent_rate / hwd->div;
+	return 0;
+}
+
+static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long *parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+	struct cdce706_dev_data *cdce = hwd->dev_data;
+	unsigned long mul, div;
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, rate: %lu, parent_rate: %lu\n",
+		__func__, rate, *parent_rate);
+
+	rational_best_approximation(rate, *parent_rate,
+				    1, CDCE706_DIVIDER_DIVIDER_MAX,
+				    &mul, &div);
+	if (!mul)
+		div = CDCE706_DIVIDER_DIVIDER_MAX;
+
+	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
+		unsigned long best_diff = rate;
+		unsigned long best_div = 0;
+		struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent];
+		unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0;
+
+		for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff &&
+		     div <= CDCE706_PLL_FREQ_MAX / rate; ++div) {
+			unsigned long n, m;
+			unsigned long diff;
+			unsigned long div_rate;
+			u64 div_rate64;
+
+			if (rate * div < CDCE706_PLL_FREQ_MIN)
+				continue;
+
+			rational_best_approximation(rate * div, gp_rate,
+						    CDCE706_PLL_N_MAX,
+						    CDCE706_PLL_M_MAX,
+						    &n, &m);
+			div_rate64 = (u64)gp_rate * n;
+			do_div(div_rate64, m);
+			do_div(div_rate64, div);
+			div_rate = div_rate64;
+			diff = max(div_rate, rate) - min(div_rate, rate);
+
+			if (diff < best_diff) {
+				best_diff = diff;
+				best_div = div;
+				dev_dbg(&hwd->dev_data->client->dev,
+					"%s, %lu * %lu / %lu / %lu = %lu\n",
+					__func__, gp_rate, n, m, div, div_rate);
+			}
+		}
+
+		div = best_div;
+
+		dev_dbg(&hwd->dev_data->client->dev,
+			"%s, altering parent rate: %lu -> %lu\n",
+			__func__, *parent_rate, rate * div);
+		*parent_rate = rate * div;
+	}
+	hwd->div = div;
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, divider: %d, div: %lu\n",
+		__func__, hwd->idx, div);
+
+	return *parent_rate / div;
+}
+
+static int cdce706_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	dev_dbg(&hwd->dev_data->client->dev,
+		"%s, divider: %d, div: %u\n",
+		__func__, hwd->idx, hwd->div);
+
+	return cdce706_reg_update(hwd->dev_data,
+				  CDCE706_DIVIDER(hwd->idx),
+				  CDCE706_DIVIDER_DIVIDER_MASK,
+				  hwd->div);
+}
+
+static const struct clk_ops cdce706_divider_ops = {
+	.set_parent = cdce706_divider_set_parent,
+	.get_parent = cdce706_divider_get_parent,
+	.recalc_rate = cdce706_divider_recalc_rate,
+	.round_rate = cdce706_divider_round_rate,
+	.set_rate = cdce706_divider_set_rate,
+};
+
+static int cdce706_clkout_prepare(struct clk_hw *hw)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	return cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
+				  CDCE706_CLKOUT_ENABLE_MASK,
+				  CDCE706_CLKOUT_ENABLE_MASK);
+}
+
+static void cdce706_clkout_unprepare(struct clk_hw *hw)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx),
+			   CDCE706_CLKOUT_ENABLE_MASK, 0);
+}
+
+static int cdce706_clkout_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	if (hwd->parent == index)
+		return 0;
+	hwd->parent = index;
+	return cdce706_reg_update(hwd->dev_data,
+				  CDCE706_CLKOUT(hwd->idx),
+				  CDCE706_CLKOUT_ENABLE_MASK, index);
+}
+
+static u8 cdce706_clkout_get_parent(struct clk_hw *hw)
+{
+	struct cdce706_hw_data *hwd = to_hw_data(hw);
+
+	return hwd->parent;
+}
+
+static unsigned long cdce706_clkout_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	return parent_rate;
+}
+
+static long cdce706_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long *parent_rate)
+{
+	*parent_rate = rate;
+	return rate;
+}
+
+static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long parent_rate)
+{
+	return 0;
+}
+
+static const struct clk_ops cdce706_clkout_ops = {
+	.prepare = cdce706_clkout_prepare,
+	.unprepare = cdce706_clkout_unprepare,
+	.set_parent = cdce706_clkout_set_parent,
+	.get_parent = cdce706_clkout_get_parent,
+	.recalc_rate = cdce706_clkout_recalc_rate,
+	.round_rate = cdce706_clkout_round_rate,
+	.set_rate = cdce706_clkout_set_rate,
+};
+
+static int cdce706_register_hw(struct cdce706_dev_data *cdce,
+			       struct cdce706_hw_data *hw, unsigned num_hw,
+			       const char * const *clk_names,
+			       struct clk_init_data *init)
+{
+	unsigned i;
+
+	for (i = 0; i < num_hw; ++i, ++hw) {
+		init->name = clk_names[i];
+		hw->dev_data = cdce;
+		hw->idx = i;
+		hw->hw.init = init;
+		hw->clk = devm_clk_register(&cdce->client->dev,
+					    &hw->hw);
+		if (IS_ERR(hw->clk)) {
+			dev_err(&cdce->client->dev, "Failed to register %s\n",
+				clk_names[i]);
+			return PTR_ERR(hw->clk);
+		}
+	}
+	return 0;
+}
+
+static int cdce706_register_clkin(struct cdce706_dev_data *cdce)
+{
+	struct clk_init_data init = {
+		.ops = &cdce706_clkin_ops,
+		.parent_names = cdce->clkin_name,
+		.num_parents = ARRAY_SIZE(cdce->clkin_name),
+	};
+	unsigned i;
+	int ret;
+	unsigned clock, source;
+
+	for (i = 0; i < ARRAY_SIZE(cdce->clkin_name); ++i) {
+		struct clk *parent = devm_clk_get(&cdce->client->dev,
+						  cdce706_source_name[i]);
+
+		if (IS_ERR(parent)) {
+			cdce->clkin_name[i] = cdce706_source_name[i];
+		} else {
+			cdce->clkin_name[i] = __clk_get_name(parent);
+			cdce->clkin_clk[i] = parent;
+		}
+	}
+
+	ret = cdce706_reg_read(cdce, CDCE706_CLKIN_SOURCE, &source);
+	if (ret < 0)
+		return ret;
+	if ((source & CDCE706_CLKIN_SOURCE_MASK) ==
+	    CDCE706_CLKIN_SOURCE_LVCMOS) {
+		ret = cdce706_reg_read(cdce, CDCE706_CLKIN_CLOCK, &clock);
+		if (ret < 0)
+			return ret;
+		cdce->clkin[0].parent = !!(clock & CDCE706_CLKIN_CLOCK_MASK);
+	}
+
+	ret = cdce706_register_hw(cdce, cdce->clkin,
+				  ARRAY_SIZE(cdce->clkin),
+				  cdce706_clkin_name, &init);
+	return ret;
+}
+
+static int cdce706_register_plls(struct cdce706_dev_data *cdce)
+{
+	struct clk_init_data init = {
+		.ops = &cdce706_pll_ops,
+		.parent_names = cdce706_clkin_name,
+		.num_parents = ARRAY_SIZE(cdce706_clkin_name),
+	};
+	unsigned i;
+	int ret;
+	unsigned mux;
+
+	ret = cdce706_reg_read(cdce, CDCE706_PLL_MUX, &mux);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(cdce->pll); ++i) {
+		unsigned m, n, v;
+
+		ret = cdce706_reg_read(cdce, CDCE706_PLL_M_LOW(i), &m);
+		if (ret < 0)
+			return ret;
+		ret = cdce706_reg_read(cdce, CDCE706_PLL_N_LOW(i), &n);
+		if (ret < 0)
+			return ret;
+		ret = cdce706_reg_read(cdce, CDCE706_PLL_HI(i), &v);
+		if (ret < 0)
+			return ret;
+		cdce->pll[i].div = m | ((v & CDCE706_PLL_HI_M_MASK) << 8);
+		cdce->pll[i].mul = n | ((v & CDCE706_PLL_HI_N_MASK) <<
+					(8 - CDCE706_PLL_HI_N_SHIFT));
+		cdce->pll[i].mux = mux & CDCE706_PLL_MUX_MASK(i);
+		dev_dbg(&cdce->client->dev,
+			"%s: i: %u, div: %u, mul: %u, mux: %d\n", __func__, i,
+			cdce->pll[i].div, cdce->pll[i].mul, cdce->pll[i].mux);
+	}
+
+	ret = cdce706_register_hw(cdce, cdce->pll,
+				  ARRAY_SIZE(cdce->pll),
+				  cdce706_pll_name, &init);
+	return ret;
+}
+
+static int cdce706_register_dividers(struct cdce706_dev_data *cdce)
+{
+	struct clk_init_data init = {
+		.ops = &cdce706_divider_ops,
+		.parent_names = cdce706_divider_parent_name,
+		.num_parents = ARRAY_SIZE(cdce706_divider_parent_name),
+		.flags = CLK_SET_RATE_PARENT,
+	};
+	unsigned i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(cdce->divider); ++i) {
+		unsigned val;
+
+		ret = cdce706_reg_read(cdce, CDCE706_DIVIDER_PLL(i), &val);
+		if (ret < 0)
+			return ret;
+		cdce->divider[i].parent =
+			(val & CDCE706_DIVIDER_PLL_MASK(i)) >>
+			CDCE706_DIVIDER_PLL_SHIFT(i);
+
+		ret = cdce706_reg_read(cdce, CDCE706_DIVIDER(i), &val);
+		if (ret < 0)
+			return ret;
+		cdce->divider[i].div = val & CDCE706_DIVIDER_DIVIDER_MASK;
+		dev_dbg(&cdce->client->dev,
+			"%s: i: %u, parent: %u, div: %u\n", __func__, i,
+			cdce->divider[i].parent, cdce->divider[i].div);
+	}
+
+	ret = cdce706_register_hw(cdce, cdce->divider,
+				  ARRAY_SIZE(cdce->divider),
+				  cdce706_divider_name, &init);
+	return ret;
+}
+
+static int cdce706_register_clkouts(struct cdce706_dev_data *cdce)
+{
+	struct clk_init_data init = {
+		.ops = &cdce706_clkout_ops,
+		.parent_names = cdce706_divider_name,
+		.num_parents = ARRAY_SIZE(cdce706_divider_name),
+		.flags = CLK_SET_RATE_PARENT,
+	};
+	unsigned i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) {
+		unsigned val;
+
+		ret = cdce706_reg_read(cdce, CDCE706_CLKOUT(i), &val);
+		if (ret < 0)
+			return ret;
+		cdce->clkout[i].parent = val & CDCE706_CLKOUT_DIVIDER_MASK;
+		dev_dbg(&cdce->client->dev,
+			"%s: i: %u, parent: %u\n", __func__, i,
+			cdce->clkout[i].parent);
+	}
+
+	ret = cdce706_register_hw(cdce, cdce->clkout,
+				  ARRAY_SIZE(cdce->clkout),
+				  cdce706_clkout_name, &init);
+	for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i)
+		cdce->clks[i] = cdce->clkout[i].clk;
+
+	return ret;
+}
+
+static int cdce706_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	struct cdce706_dev_data *cdce;
+	int ret;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -EIO;
+
+	cdce = devm_kzalloc(&client->dev, sizeof(*cdce), GFP_KERNEL);
+	if (!cdce)
+		return -ENOMEM;
+
+	cdce->client = client;
+	cdce->regmap = devm_regmap_init_i2c(client, &cdce706_regmap_config);
+	if (IS_ERR(cdce->regmap)) {
+		dev_err(&client->dev, "Failed to initialize regmap\n");
+		return -EINVAL;
+	}
+
+	i2c_set_clientdata(client, cdce);
+
+	ret = cdce706_register_clkin(cdce);
+	if (ret < 0)
+		return ret;
+	ret = cdce706_register_plls(cdce);
+	if (ret < 0)
+		return ret;
+	ret = cdce706_register_dividers(cdce);
+	if (ret < 0)
+		return ret;
+	ret = cdce706_register_clkouts(cdce);
+	if (ret < 0)
+		return ret;
+	cdce->onecell.clks = cdce->clks;
+	cdce->onecell.clk_num = ARRAY_SIZE(cdce->clks);
+	ret = of_clk_add_provider(client->dev.of_node, of_clk_src_onecell_get,
+				  &cdce->onecell);
+
+	return ret;
+}
+
+static int cdce706_remove(struct i2c_client *client)
+{
+	return 0;
+}
+
+
+#ifdef CONFIG_OF
+static const struct of_device_id cdce706_dt_match[] = {
+	{ .compatible = "ti,cdce706" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, cdce706_dt_match);
+#endif
+
+static const struct i2c_device_id cdce706_id[] = {
+	{ "cdce706", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, cdce706_id);
+
+static struct i2c_driver cdce706_i2c_driver = {
+	.driver	= {
+		.name	= "cdce706",
+		.of_match_table = of_match_ptr(cdce706_dt_match),
+	},
+	.probe		= cdce706_probe,
+	.remove		= cdce706_remove,
+	.id_table	= cdce706_id,
+};
+module_i2c_driver(cdce706_i2c_driver);
+
+MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
+MODULE_DESCRIPTION("TI CDCE 706 clock synthesizer driver");
+MODULE_LICENSE("GPL");
-- 
1.8.1.4

^ permalink raw reply related	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2015-01-13  0:23 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2015-01-12  7:20 [PATCH v2] clk: TI CDCE706 clock synthesizer driver Max Filippov
     [not found] ` <1421047246-15890-1-git-send-email-jcmvbkbc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-01-13  0:23   ` Mike Turquette

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