[PATCH] clk: vc5: Add support for IDT VersaClock 5P49V5923B

Marek Vasut
2016-12-28T00:00:45Z

Add driver for IDT VersaClock 5 5P49V5923B chip. This chip has two
clock inputs, XTAL or CLK, which are muxed into single PLL/VCO input.
The PLL feeds two fractional dividers. Each fractional divider feeds
output mux, which allows selecting between clock from the fractional
divider itself or from output mux on output N-1. In case of output
mux 0, the output N-1 is instead connected to the output from the mux
feeding the PLL.

The driver thus far supports only the 5P49V5923B, while it should be
easily extensible to the whole 5P49V59xx family of chips as they are
all pretty similar.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
---
.../devicetree/bindings/clock/idt,versaclock5.txt | 41 ++
drivers/clk/Kconfig | 10 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-versaclock5.c | 696 +++++++++++++++++++++
4 files changed, 748 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/idt,versaclock5.txt
create mode 100644 drivers/clk/clk-versaclock5.c

diff --git a/Documentation/devicetree/bindings/clock/idt,versaclock5.txt b/Documentation/devicetree/bindings/clock/idt,versaclock5.txt
new file mode 100644
index 0000000..cbe5bc8
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/idt,versaclock5.txt
@@ -0,0 +1,41 @@
+Binding for IDT VersaClock5 programmable i2c clock generator.
+
+The IDT VersaClock5 are programmable i2c clock generators providing
+from 3 to 12 output clocks.
+
+==I2C device node==
+
+Required properties:
+- compatible: shall be one of "idt,5p49v5923b".
+- reg: i2c device address, shall be 0x68 or 0x6a.
+- #clock-cells: from common clock binding; shall be set to 1.
+- clocks: from common clock binding; list of parent clock handles,
+ shall be XTAL or CLKIN reference clock. Corresponding
+ clock input names are "xin" and "clkin" respectively.
+- #address-cells: shall be set to 1.
+- #size-cells: shall be set to 0.
+
+==Example==
+
+/* 25MHz reference crystal */
+ref25: ref25m {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <25000000>;
+};
+
+i2c-master-node {
+
+ /* IDT 5P49V5923B i2c clock generator */
+ vc5: clock-generator@6a {
+ compatible = "idt,5p49v5923b";
+ reg = <0x6a>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #clock-cells = <1>;
+
+ /* Connect XIN input to 25MHz reference */
+ clocks = <&ref25m>;
+ clock-names = "xin";
+ };
+};
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 6a8ac04..9160e67 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -198,6 +198,16 @@ config COMMON_CLK_OXNAS
---help---
Support for the OXNAS SoC Family clocks.

+config COMMON_CLK_VC5
+ tristate "Clock driver for IDT VersaClock5 devices"
+ depends on I2C
+ depends on OF
+ select REGMAP_I2C
+ help
+ ---help---
+ This driver supports the IDT VersaClock5 programmable clock
+ generator.
+
source "drivers/clk/bcm/Kconfig"
source "drivers/clk/hisilicon/Kconfig"
source "drivers/clk/mediatek/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 925081e..e0754d9 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_ARCH_TANGO) += clk-tango4.o
obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o
obj-$(CONFIG_ARCH_U300) += clk-u300.o
obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
+obj-$(CONFIG_COMMON_CLK_VC5) += clk-versaclock5.o
obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o

diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
new file mode 100644
index 0000000..286689d
--- /dev/null
+++ b/drivers/clk/clk-versaclock5.c
@@ -0,0 +1,696 @@
+/*
+ * Driver for IDT Versaclock 5
+ *
+ * Copyright (C) 2016 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * Possible optimizations:
+ * - Support other chips but 5P49V5923B
+ * - Use spread spectrum
+ * - Use integer divider in FOD if applicable
+ * - register OUT0_SEL_I2CB
+ */
+
+#include <linux/clk.h>
+#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>
+
+/* VersaClock5 registers */
+#define VC5_OTP_CONTROL 0x00
+
+/* Factory-reserved register block */
+#define VC5_RSVD_DEVICE_ID 0x01
+#define VC5_RSVD_ADC_GAIN_7_0 0x02
+#define VC5_RSVD_ADC_GAIN_15_8 0x03
+#define VC5_RSVD_ADC_OFFSET_7_0 0x04
+#define VC5_RSVD_ADC_OFFSET_15_8 0x05
+#define VC5_RSVD_TEMPY 0x06
+#define VC5_RSVD_OFFSET_TBIN 0x07
+#define VC5_RSVD_GAIN 0x08
+#define VC5_RSVD_TEST_NP 0x09
+#define VC5_RSVD_UNUSED 0x0a
+#define VC5_RSVD_BANDGAP_TRIM_UP 0x0b
+#define VC5_RSVD_BANDGAP_TRIM_DN 0x0c
+#define VC5_RSVD_CLK_R_12_CLK_AMP_4 0x0d
+#define VC5_RSVD_CLK_R_34_CLK_AMP_4 0x0e
+#define VC5_RSVD_CLK_AMP_123 0x0f
+
+/* Configuration register block */
+#define VC5_PRIM_SRC_SHDN 0x10
+#define VC5_PRIM_SRC_SHDN_EN_XTAL BIT(7)
+#define VC5_PRIM_SRC_SHDN_EN_CLKIN BIT(6)
+#define VC5_PRIM_SRC_SHDN_SP BIT(1)
+#define VC5_PRIM_SRC_SHDN_EN_GBL_SHDN BIT(0)
+
+#define VC5_VCO_BAND 0x11
+#define VC5_XTAL_X1_LOAD_CAP 0x12
+#define VC5_XTAL_X2_LOAD_CAP 0x13
+#define VC5_REF_DIVIDER 0x15
+#define VC5_REF_DIVIDER_SEL_PREDIV2 BIT(7)
+#define VC5_REF_DIVIDER_REF_DIV(n) ((n) & 0x3f)
+
+#define VC5_VCO_CTRL_AND_PREDIV 0x16
+#define VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV BIT(7)
+
+#define VC5_FEEDBACK_INT_DIV 0x17
+#define VC5_FEEDBACK_INT_DIV_BITS 0x18
+#define VC5_FEEDBACK_FRAC_DIV(n) (0x19 + (n))
+#define VC5_RC_CONTROL0 0x1e
+#define VC5_RC_CONTROL1 0x1f
+/* Register 0x20 is factory reserved */
+
+/* Output divider control for divider 1,2,3,4 */
+#define VC5_OUT_DIV_CONTROL(idx) (0x21 + ((idx) * 0x10))
+#define VC5_OUT_DIV_CONTROL_RESET BIT(7)
+#define VC5_OUT_DIV_CONTROL_SELB_NORM BIT(3)
+#define VC5_OUT_DIV_CONTROL_SEL_EXT BIT(2)
+#define VC5_OUT_DIV_CONTROL_INT_MODE BIT(1)
+#define VC5_OUT_DIV_CONTROL_EN_FOD BIT(0)
+
+#define VC5_OUT_DIV_FRAC(idx, n) (0x22 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_FRAC4_OD_SCEE BIT(1)
+
+#define VC5_OUT_DIV_STEP_SPREAD(idx, n) (0x26 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SPREAD_MOD(idx, n) (0x29 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SKEW_INT(idx, n) (0x2b + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_INT(idx, n) (0x2d + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SKEW_FRAC(idx) (0x2f + ((idx) * 0x10))
+/* Register 0x30, 0x40, 0x50 is factory reserved */
+
+/* Clock control register for clock 1,2 */
+#define VC5_CLK_OUTPUT_CFG(idx, n) (0x60 + ((idx) * 0x2) + (n))
+#define VC5_CLK_OUTPUT_CFG1_EN_CLKBUF BIT(0)
+
+#define VC5_CLK_OE_SHDN 0x68
+#define VC5_CLK_OS_SHDN 0x69
+
+/* PLL/VCO runs between 2.5 GHz and 3.0 GHz */
+#define VC5_PLL_VCO_MIN 2500000000
+#define VC5_PLL_VCO_MAX 3000000000
+
+struct vc5_driver_data;
+
+struct vc5_hw_data {
+ struct clk_hw hw;
+ struct vc5_driver_data *vc5;
+ unsigned long div_int;
+ unsigned long div_frc;
+ unsigned char num;
+};
+
+struct vc5_driver_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+
+ struct clk *pin_xin;
+ const char *pin_xin_name;
+ struct clk_hw clk_xin;
+ struct clk *pin_clkin;
+ const char *pin_clkin_name;
+ struct clk_hw clk_clkin;
+ unsigned char clk_mux_ins;
+ struct clk_hw clk_mux;
+ struct vc5_hw_data clk_pll;
+ struct vc5_hw_data clk_fod[2];
+ struct vc5_hw_data clk_out[3];
+};
+
+static const char * const vc5_input_names[] = {
+ "xin", "clkin"
+};
+
+static const char * const vc5_pll_names[] = {
+ "pll"
+};
+
+static const char * const vc5_mux_names[] = {
+ "mux"
+};
+
+static const char * const vc5_fod_names[] = {
+ "fod0", "fod1"
+};
+
+static const char * const vc5_clk_out_names[] = {
+ "out0_sel_i2cb", "out1", "out2"
+};
+
+/*
+ * VersaClock5 i2c regmap
+ */
+static bool vc5_regmap_is_writeable(struct device *dev, unsigned int reg)
+{
+ /* Factory reserved regs, make them read-only */
+ if (reg >= 0 && reg <= 0xf)
+ return false;
+
+ /* Factory reserved regs, make them read-only */
+ if (reg == 0x14 || reg == 0x1c || reg == 0x1d)
+ return false;
+
+ return true;
+}
+
+static const struct regmap_config vc5_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_RBTREE,
+ .max_register = 0x69,
+ .writeable_reg = vc5_regmap_is_writeable,
+};
+
+/*
+ * VersaClock5 input multiplexer between XTAL and CLKIN divider
+ */
+static unsigned char vc5_mux_get_parent(struct clk_hw *hw)
+{
+ struct vc5_driver_data *vc5 =
+ container_of(hw, struct vc5_driver_data, clk_mux);
+ const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ unsigned int src;
+
+ regmap_read(vc5->regmap, VC5_PRIM_SRC_SHDN, &src);
+ src &= mask;
+
+ if (src == VC5_PRIM_SRC_SHDN_EN_XTAL)
+ return 0;
+
+ if (src == VC5_PRIM_SRC_SHDN_EN_CLKIN)
+ return 1;
+
+ dev_warn(&vc5->client->dev,
+ "Invalid clock input configuration (%02x)\n", src);
+ return 0;
+}
+
+static int vc5_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct vc5_driver_data *vc5 =
+ container_of(hw, struct vc5_driver_data, clk_mux);
+ const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ u8 src;
+
+ if ((index > 1) || !vc5->clk_mux_ins)
+ return -EINVAL;
+
+ if (vc5->clk_mux_ins == (BIT(0) | BIT(1))) {
+ if (index == 0)
+ src = VC5_PRIM_SRC_SHDN_EN_XTAL;
+ if (index == 1)
+ src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ } else {
+ if (index != 0)
+ return -EINVAL;
+
+ if (vc5->clk_mux_ins == BIT(0))
+ src = VC5_PRIM_SRC_SHDN_EN_XTAL;
+ if (vc5->clk_mux_ins == BIT(1))
+ src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ }
+
+ return regmap_update_bits(vc5->regmap, VC5_PRIM_SRC_SHDN, mask, src);
+}
+
+static unsigned long vc5_mux_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct vc5_driver_data *vc5 =
+ container_of(hw, struct vc5_driver_data, clk_mux);
+ unsigned long idiv;
+ u8 div;
+
+ /* FIXME: Needs locking ? */
+
+ /* CLKIN within range of PLL input, feed directly to PLL. */
+ if (parent_rate <= 50000000) {
+ regmap_update_bits(vc5->regmap, VC5_VCO_CTRL_AND_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV);
+ regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, 0x00);
+ return parent_rate;
+ }
+
+ idiv = DIV_ROUND_UP(parent_rate, 50000000);
+ if (idiv > 127)
+ return -EINVAL;
+
+ /* We have dedicated div-2 predivider. */
+ if (idiv == 2)
+ div = VC5_REF_DIVIDER_SEL_PREDIV2;
+ else
+ div = VC5_REF_DIVIDER_REF_DIV(idiv);
+
+ regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, div);
+ regmap_update_bits(vc5->regmap, VC5_VCO_CTRL_AND_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV, 0);
+
+ return parent_rate / idiv;
+}
+
+static const struct clk_ops vc5_mux_ops = {
+ .set_parent = vc5_mux_set_parent,
+ .get_parent = vc5_mux_get_parent,
+ .recalc_rate = vc5_mux_recalc_rate,
+};
+
+/*
+ * VersaClock5 PLL/VCO
+ */
+static unsigned long vc5_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ u32 div_int, div_frc;
+ u8 fb[5];
+
+ regmap_bulk_read(vc5->regmap, VC5_FEEDBACK_INT_DIV, fb, 5);
+
+ div_int = (fb[0] << 4) | (fb[1] >> 4);
+ div_frc = (fb[2] << 16) | (fb[3] << 8) | fb[4];
+
+ /* The PLL divider has 12 integer bits and 24 fractional bits */
+ return (parent_rate * div_int) + ((parent_rate * div_frc) >> 24);
+}
+
+static long vc5_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ unsigned long div_int;
+ unsigned long long div_frc;
+
+ if (rate < VC5_PLL_VCO_MIN)
+ rate = VC5_PLL_VCO_MIN;
+ if (rate > VC5_PLL_VCO_MAX)
+ rate = VC5_PLL_VCO_MAX;
+
+ /* Determine integer part, which is 12 bit wide */
+ div_int = rate / *parent_rate;
+ if (div_int > 0xfff)
+ rate = *parent_rate * 0xfff;
+
+ /* Determine best fractional part, which is 24 bit wide */
+ div_frc = rate % *parent_rate;
+ div_frc *= BIT(24) - 1;
+ do_div(div_frc, *parent_rate);
+
+ hwdata->div_int = div_int;
+ hwdata->div_frc = (unsigned long)div_frc;
+
+ return (*parent_rate * div_int) + ((*parent_rate * div_frc) >> 24);
+}
+
+static int vc5_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ u8 fb[5];
+
+ fb[0] = hwdata->div_int >> 4;
+ fb[1] = hwdata->div_int << 4;
+ fb[2] = hwdata->div_frc >> 16;
+ fb[3] = hwdata->div_frc >> 8;
+ fb[4] = hwdata->div_frc;
+
+ return regmap_bulk_write(vc5->regmap, VC5_FEEDBACK_INT_DIV, fb, 5);
+}
+
+static const struct clk_ops vc5_pll_ops = {
+ .recalc_rate = vc5_pll_recalc_rate,
+ .round_rate = vc5_pll_round_rate,
+ .set_rate = vc5_pll_set_rate,
+};
+
+static unsigned long vc5_fod_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ /* VCO frequency is divided by two before entering FOD */
+ u64 f_in = parent_rate / 2;
+ u64 div_int, div_frc;
+ u8 od_int[2];
+ u8 od_frc[4];
+
+ regmap_bulk_read(vc5->regmap, VC5_OUT_DIV_INT(hwdata->num, 0),
+ od_int, 2);
+ regmap_bulk_read(vc5->regmap, VC5_OUT_DIV_FRAC(hwdata->num, 0),
+ od_frc, 4);
+
+ div_int = (od_int[0] << 4) | (od_int[1] >> 4);
+ div_frc = (od_frc[0] << 22) | (od_frc[1] << 14) |
+ (od_frc[2] << 6) | (od_frc[3] >> 2);
+
+ /* The PLL divider has 12 integer bits and 30 fractional bits */
+ return div64_u64(f_in << 30ULL, (div_int << 30ULL) + div_frc);
+}
+
+static long vc5_fod_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ /* VCO frequency is divided by two before entering FOD */
+ unsigned long long f_in = *parent_rate / 2;
+ unsigned long div_int;
+ unsigned long long div_frc;
+
+ /* Determine integer part, which is 12 bit wide */
+ div_int = f_in / rate;
+ /*
+ * WARNING: The clock chip does not output signal if the integer part
+ * of the divider is 0xfff and fractional part is non-zero.
+ * Clamp the divider at 0xffe to keep the code simple.
+ */
+ if (div_int > 0xffe) {
+ div_int = 0xffe;
+ rate = f_in / div_int;
+ }
+
+ /* Determine best fractional part, which is 30 bit wide */
+ div_frc = f_in % rate;
+ div_frc *= BIT(30) - 1;
+ do_div(div_frc, rate);
+
+ hwdata->div_int = div_int;
+ hwdata->div_frc = (unsigned long)div_frc;
+
+ return div64_u64(f_in << 30ULL, (div_int << 30ULL) + div_frc);
+}
+
+static int vc5_fod_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ u8 od_int[2];
+ u8 od_frc[4];
+
+ od_int[0] = hwdata->div_int >> 4;
+ od_int[1] = hwdata->div_int << 4;
+ od_frc[0] = hwdata->div_frc >> 22;
+ od_frc[1] = hwdata->div_frc >> 14;
+ od_frc[2] = hwdata->div_frc >> 6;
+ od_frc[3] = hwdata->div_frc << 2;
+
+ regmap_bulk_write(vc5->regmap, VC5_OUT_DIV_INT(hwdata->num, 0),
+ od_int, 2);
+ regmap_bulk_write(vc5->regmap, VC5_OUT_DIV_FRAC(hwdata->num, 0),
+ od_frc, 4);
+ return 0;
+}
+
+static const struct clk_ops vc5_fod_ops = {
+ .recalc_rate = vc5_fod_recalc_rate,
+ .round_rate = vc5_fod_round_rate,
+ .set_rate = vc5_fod_set_rate,
+};
+
+static int vc5_clk_out_prepare(struct clk_hw *hw)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+
+ /* Enable the clock buffer */
+ regmap_update_bits(vc5->regmap, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF,
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF);
+ return 0;
+}
+
+static void vc5_clk_out_unprepare(struct clk_hw *hw)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+
+ /* Enable the clock buffer */
+ regmap_update_bits(vc5->regmap, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF, 0);
+}
+
+static unsigned char vc5_clk_out_get_parent(struct clk_hw *hw)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ const u8 mask = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT |
+ VC5_OUT_DIV_CONTROL_EN_FOD;
+ const u8 fodclkmask = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_EN_FOD;
+ const u8 extclk = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT;
+ unsigned int src;
+
+ regmap_read(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num), &src);
+ src &= mask;
+
+ if ((src & fodclkmask) == VC5_OUT_DIV_CONTROL_EN_FOD)
+ return 0;
+
+ if (src == extclk)
+ return 1;
+
+ dev_warn(&vc5->client->dev,
+ "Invalid clock output configuration (%02x)\n", src);
+ return 0;
+}
+
+static int vc5_clk_out_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ const u8 mask = VC5_OUT_DIV_CONTROL_RESET |
+ VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT |
+ VC5_OUT_DIV_CONTROL_EN_FOD;
+ const u8 extclk = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT;
+ u8 src = VC5_OUT_DIV_CONTROL_RESET;
+
+ if (index == 0)
+ src |= VC5_OUT_DIV_CONTROL_EN_FOD;
+ else if (index == 1)
+ src |= extclk;
+ else
+ return -EINVAL;
+
+ return regmap_update_bits(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num),
+ mask, src);
+}
+
+static const struct clk_ops vc5_clk_out_ops = {
+ .prepare = vc5_clk_out_prepare,
+ .unprepare = vc5_clk_out_unprepare,
+ .set_parent = vc5_clk_out_set_parent,
+ .get_parent = vc5_clk_out_get_parent,
+};
+
+static struct clk_hw *
+vc5_of_clk_get(struct of_phandle_args *clkspec, void *data)
+{
+ struct vc5_driver_data *vc5 = data;
+ unsigned int idx = clkspec->args[0];
+
+ if (idx >= 2) {
+ pr_err("%s: invalid index %u\n", __func__, idx);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return &vc5->clk_out[idx].hw;
+}
+
+static int vc5_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct vc5_driver_data *vc5;
+ struct clk_init_data init;
+ const char *parent_names[2];
+ int ret, n;
+
+ vc5 = devm_kzalloc(&client->dev, sizeof(*vc5), GFP_KERNEL);
+ if (vc5 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, vc5);
+ vc5->client = client;
+
+ vc5->pin_xin = devm_clk_get(&client->dev, "xin");
+ if (PTR_ERR(vc5->pin_xin) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ vc5->pin_clkin = devm_clk_get(&client->dev, "clkin");
+ if (PTR_ERR(vc5->pin_clkin) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ vc5->regmap = devm_regmap_init_i2c(client, &vc5_regmap_config);
+ if (IS_ERR(vc5->regmap)) {
+ dev_err(&client->dev, "failed to allocate register map\n");
+ return PTR_ERR(vc5->regmap);
+ }
+
+ if (!IS_ERR(vc5->pin_xin)) {
+ clk_prepare_enable(vc5->pin_xin);
+ vc5->pin_xin_name = __clk_get_name(vc5->pin_xin);
+ vc5->clk_mux_ins |= BIT(0);
+ }
+
+ if (!IS_ERR(vc5->pin_clkin)) {
+ clk_prepare_enable(vc5->pin_clkin);
+ vc5->pin_clkin_name = __clk_get_name(vc5->pin_clkin);
+ vc5->clk_mux_ins |= BIT(1);
+ }
+
+ if (!vc5->clk_mux_ins) {
+ dev_err(&client->dev, "no input clock specified!\n");
+ return -EINVAL;
+ }
+
+ /* Register clock input mux */
+ memset(&init, 0, sizeof(init));
+ if (vc5->clk_mux_ins == (BIT(0) | BIT(1))) {
+ parent_names[0] = vc5->pin_xin_name;
+ parent_names[1] = vc5->pin_clkin_name;
+ init.num_parents = 2;
+ } else if (vc5->clk_mux_ins == BIT(0)) {
+ parent_names[0] = vc5->pin_xin_name;
+ init.num_parents = 1;
+ } else {
+ parent_names[0] = vc5->pin_clkin_name;
+ init.num_parents = 1;
+ }
+ init.name = vc5_mux_names[0];
+ init.ops = &vc5_mux_ops;
+ init.flags = 0;
+ init.parent_names = parent_names;
+ vc5->clk_mux.init = &init;
+ ret = devm_clk_hw_register(&client->dev, &vc5->clk_mux);
+ if (ret) {
+ dev_err(&client->dev, "unable to register %s\n", init.name);
+ goto err_clk;
+ }
+
+ /* Register PLL */
+ memset(&init, 0, sizeof(init));
+ init.name = vc5_pll_names[0];
+ init.ops = &vc5_pll_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = vc5_mux_names;
+ init.num_parents = 1;
+ vc5->clk_pll.num = 0;
+ vc5->clk_pll.vc5 = vc5;
+ vc5->clk_pll.hw.init = &init;
+ ret = devm_clk_hw_register(&client->dev, &vc5->clk_pll.hw);
+ if (ret) {
+ dev_err(&client->dev, "unable to register %s\n", init.name);
+ goto err_clk;
+ }
+
+ /* Register FODs */
+ for (n = 0; n < 2; n++) {
+ memset(&init, 0, sizeof(init));
+ init.name = vc5_fod_names[n];
+ init.ops = &vc5_fod_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = vc5_pll_names;
+ init.num_parents = 1;
+ vc5->clk_fod[n].num = n;
+ vc5->clk_fod[n].vc5 = vc5;
+ vc5->clk_fod[n].hw.init = &init;
+ ret = devm_clk_hw_register(&client->dev, &vc5->clk_fod[n].hw);
+ if (ret) {
+ dev_err(&client->dev, "unable to register %s\n",
+ init.name);
+ goto err_clk;
+ }
+ }
+
+ /* Register OUT1 and OUT2 */
+ for (n = 0; n < 2; n++) {
+ parent_names[0] = vc5_fod_names[n];
+ if (n == 0)
+ parent_names[1] = vc5_mux_names[0];
+ else
+ parent_names[1] = vc5_clk_out_names[n];
+
+ memset(&init, 0, sizeof(init));
+ init.name = vc5_clk_out_names[n + 1];
+ init.ops = &vc5_clk_out_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.parent_names = parent_names;
+ init.num_parents = 2;
+ vc5->clk_out[n].num = n;
+ vc5->clk_out[n].vc5 = vc5;
+ vc5->clk_out[n].hw.init = &init;
+ ret = devm_clk_hw_register(&client->dev,
+ &vc5->clk_out[n].hw);
+ if (ret) {
+ dev_err(&client->dev, "unable to register %s\n",
+ init.name);
+ goto err_clk;
+ }
+ }
+
+ ret = of_clk_add_hw_provider(client->dev.of_node, vc5_of_clk_get, vc5);
+ if (ret) {
+ dev_err(&client->dev, "unable to add clk provider\n");
+ goto err_clk;
+ }
+
+ return 0;
+
+err_clk:
+ if (!IS_ERR(vc5->pin_xin))
+ clk_disable_unprepare(vc5->pin_xin);
+ if (!IS_ERR(vc5->pin_clkin))
+ clk_disable_unprepare(vc5->pin_clkin);
+ return ret;
+}
+
+
+static const struct i2c_device_id vc5_id[] = {
+ { "5p49v5923b", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, vc5_id);
+
+static const struct of_device_id clk_vc5_of_match[] = {
+ { .compatible = "idt,5p49v5923b" },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, clk_vc5_of_match);
+
+static struct i2c_driver vc5_driver = {
+ .driver = {
+ .name = "vc5",
+ .of_match_table = clk_vc5_of_match,
+ },
+ .probe = vc5_probe,
+ .id_table = vc5_id,
+};
+
+module_i2c_driver(vc5_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("IDT VersaClock 5 driver");
+MODULE_LICENSE("GPL");
--
2.10.2