* [PATCH v3 1/3] clk: add support for the lmk04832
2021-02-24 2:31 [PATCH v3 0/3] add support for the lmk04832 Liam Beguin
@ 2021-02-24 2:31 ` Liam Beguin
2021-02-24 2:31 ` [PATCH v3 2/3] clk: lmk04832: add support for digital delay Liam Beguin
2021-02-24 2:31 ` [PATCH v3 3/3] dt-bindings: clock: add ti,lmk04832 bindings Liam Beguin
2 siblings, 0 replies; 5+ messages in thread
From: Liam Beguin @ 2021-02-24 2:31 UTC (permalink / raw)
To: liambeguin, mturquette, sboyd
Cc: linux-clk, linux-kernel, devicetree, robh+dt
From: Liam Beguin <lvb@xiphos.com>
The LMK04832 is an ultra-high performance clock conditioner with JEDEC
JESD204B support and is also pin compatible with the LMK0482x family of
devices.
Signed-off-by: Liam Beguin <lvb@xiphos.com>
---
drivers/clk/Kconfig | 7 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-lmk04832.c | 1286 ++++++++++++++++++++++++++++++++++++
3 files changed, 1294 insertions(+)
create mode 100644 drivers/clk/clk-lmk04832.c
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 85856cff506c..1eea7fa8f394 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -55,6 +55,13 @@ config CLK_HSDK
This driver supports the HSDK core, system, ddr, tunnel and hdmi PLLs
control.
+config LMK04832
+ tristate "Ti LMK04832 JESD204B Compliant Clock Jitter Cleaner"
+ select REGMAP_SPI
+ help
+ Say yes here to build support for Texas Instruments' LMK04832 Ultra
+ Low-Noise JESD204B Compliant Clock Jitter Cleaner With Dual Loop PLLs
+
config COMMON_CLK_MAX77686
tristate "Clock driver for Maxim 77620/77686/77802 MFD"
depends on MFD_MAX77686 || MFD_MAX77620 || COMPILE_TEST
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index dbdc590e7de3..ec2c0437e548 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_COMMON_CLK_ASPEED) += clk-aspeed.o
obj-$(CONFIG_MACH_ASPEED_G6) += clk-ast2600.o
obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
obj-$(CONFIG_CLK_HSDK) += clk-hsdk-pll.o
+obj-$(CONFIG_LMK04832) += clk-lmk04832.o
obj-$(CONFIG_COMMON_CLK_LOCHNAGAR) += clk-lochnagar.o
obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
obj-$(CONFIG_COMMON_CLK_MAX9485) += clk-max9485.o
diff --git a/drivers/clk/clk-lmk04832.c b/drivers/clk/clk-lmk04832.c
new file mode 100644
index 000000000000..387a60fa2111
--- /dev/null
+++ b/drivers/clk/clk-lmk04832.c
@@ -0,0 +1,1286 @@
+/*
+ * LMK04832 Ultra Low-Noise JESD204B Compliant Clock Jitter Cleaner
+ * Pin compatible with the LMK0482x family
+ *
+ * Datasheet: https://www.ti.com/lit/ds/symlink/lmk04832.pdf
+ *
+ * Copyright (c) 2020, Xiphos Systems Corp.
+ *
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/gcd.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+/* 0x000 - 0x00d System Functions */
+#define LMK04832_REG_RST3W 0x000
+#define LMK04832_BIT_RESET BIT(7)
+#define LMK04832_BIT_SPI_3WIRE_DIS BIT(4)
+#define LMK04832_REG_POWERDOWN 0x002
+#define LMK04832_REG_ID_DEV_TYPE 0x003
+#define LMK04832_REG_ID_PROD_MSB 0x004
+#define LMK04832_REG_ID_PROD_LSB 0x005
+#define LMK04832_REG_ID_MASKREV 0x006
+#define LMK04832_REG_ID_VNDR_MSB 0x00c
+#define LMK04832_REG_ID_VNDR_LSB 0x00d
+
+/* 0x100 - 0x137 Device Clock and SYSREF Clock Output Control */
+#define LMK04832_REG_CLKOUT_CTRL0(ch) (0x100 + (ch >> 1) * 8)
+#define LMK04832_BIT_DCLK_DIV_LSB GENMASK(7, 0)
+#define LMK04832_REG_CLKOUT_CTRL1(ch) (0x101 + (ch >> 1) * 8)
+#define LMK04832_REG_CLKOUT_CTRL2(ch) (0x102 + (ch >> 1) * 8)
+#define LMK04832_BIT_CLKOUTX_Y_PD BIT(7)
+#define LMK04832_BIT_DCLK_DIV_MSB GENMASK(1, 0)
+#define LMK04832_REG_CLKOUT_SRC_MUX(ch) (0x103 + (ch % 2) + (ch >> 1) * 8)
+#define LMK04832_BIT_CLKOUT_SRC_MUX BIT(5)
+#define LMK04832_REG_CLKOUT_CTRL3(ch) (0x103 + (ch >> 1) * 8)
+#define LMK04832_BIT_DCLKX_Y_PD BIT(4)
+#define LMK04832_BIT_DCLKX_Y_DCC BIT(2)
+#define LMK04832_REG_CLKOUT_CTRL4(ch) (0x104 + (ch >> 1) * 8)
+#define LMK04832_BIT_SCLK_PD BIT(4)
+#define LMK04832_REG_CLKOUT_FMT(ch) (0x107 + (ch >> 1) * 8)
+#define LMK04832_BIT_CLKOUT_FMT(ch) (ch % 2 ? 0xf0 : 0x0f)
+#define LMK04832_VAL_CLKOUT_FMT_POWERDOWN 0x00
+#define LMK04832_VAL_CLKOUT_FMT_LVDS 0x01
+#define LMK04832_VAL_CLKOUT_FMT_HSDS6 0x02
+#define LMK04832_VAL_CLKOUT_FMT_HSDS8 0x03
+#define LMK04832_VAL_CLKOUT_FMT_LVPECL1600 0x04
+#define LMK04832_VAL_CLKOUT_FMT_LVPECL2000 0x05
+#define LMK04832_VAL_CLKOUT_FMT_LCPECL 0x06
+#define LMK04832_VAL_CLKOUT_FMT_CML16 0x07
+#define LMK04832_VAL_CLKOUT_FMT_CML24 0x08
+#define LMK04832_VAL_CLKOUT_FMT_CML32 0x09
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_OFF_INV 0x0a
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_OFF 0x0b
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_INV 0x0c
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_NOR 0x0d
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_INV 0x0e
+#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_NOR 0x0f
+
+/* 0x138 - 0x145 SYSREF, SYNC, and Device Config */
+#define LMK04832_REG_VCO_OSCOUT 0x138
+#define LMK04832_BIT_VCO_MUX GENMASK(6, 5)
+#define LMK04832_VAL_VCO_MUX_VCO0 0x00
+#define LMK04832_VAL_VCO_MUX_VCO1 0x01
+#define LMK04832_VAL_VCO_MUX_EXT 0x02
+#define LMK04832_REG_SYSREF_OUT 0x139
+#define LMK04832_BIT_SYSREF_MUX GENMASK(1, 0)
+#define LMK04832_VAL_SYSREF_MUX_CONTINUOUS 0x03
+#define LMK04832_REG_SYSREF_DIV_MSB 0x13a
+#define LMK04832_BIT_SYSREF_DIV_MSB GENMASK(4, 0)
+#define LMK04832_REG_SYSREF_DIV_LSB 0x13b
+#define LMK04832_REG_FB_CTRL 0x13f
+#define LMK04832_BIT_PLL2_RCLK_MUX BIT(7)
+#define LMK04832_VAL_PLL2_RCLK_MUX_OSCIN 0x00
+#define LMK04832_VAL_PLL2_RCLK_MUX_CLKIN 0x01
+#define LMK04832_BIT_PLL2_NCLK_MUX BIT(5)
+#define LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P 0x00
+#define LMK04832_VAL_PLL2_NCLK_MUX_FB_MUX 0x01
+#define LMK04832_BIT_FB_MUX_EN BIT(0)
+#define LMK04832_REG_MAIN_PD 0x140
+#define LMK04832_BIT_PLL1_PD BIT(7)
+#define LMK04832_BIT_VCO_LDO_PD BIT(6)
+#define LMK04832_BIT_VCO_PD BIT(5)
+#define LMK04832_BIT_OSCIN_PD BIT(4)
+#define LMK04832_BIT_SYSREF_GBL_PD BIT(3)
+#define LMK04832_BIT_SYSREF_PD BIT(2)
+#define LMK04832_BIT_SYSREF_DDLY_PD BIT(1)
+#define LMK04832_BIT_SYSREF_PLSR_PD BIT(0)
+#define LMK04832_REG_SYNC 0x143
+#define LMK04832_BIT_SYNC_EN BIT(4)
+#define LMK04832_REG_SYNC_DIS 0x144
+
+/* 0x146 - 0x14a CLKin Control */
+#define LMK04832_REG_CLKIN_SEL0 0x148
+#define LMK04832_REG_CLKIN_SEL1 0x149
+#define LMK04832_REG_CLKIN_RST 0x14a
+#define LMK04832_BIT_SDIO_RDBK_TYPE BIT(6)
+#define LMK04832_BIT_CLKIN_SEL_MUX GENMASK(5, 3)
+#define LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK 0x06
+#define LMK04832_BIT_CLKIN_SEL_TYPE GENMASK(2, 0)
+#define LMK04832_VAL_CLKIN_SEL_TYPE_OUT 0x03
+
+/* 0x14b - 0x152 Holdover */
+
+/* 0x153 - 0x15f PLL1 Configuration */
+
+/* 0x160 - 0x16e PLL2 Configuration */
+#define LMK04832_REG_PLL2_R_MSB 0x160
+#define LMK04832_BIT_PLL2_R_MSB GENMASK(3, 0)
+#define LMK04832_REG_PLL2_R_LSB 0x161
+#define LMK04832_REG_PLL2_MISC 0x162
+#define LMK04832_BIT_PLL2_MISC_P GENMASK(7, 5)
+#define LMK04832_BIT_PLL2_MISC_REF_2X_EN BIT(0)
+#define LMK04832_REG_PLL2_N_CAL_0 0x163
+#define LMK04832_BIT_PLL2_N_CAL_0 GENMASK(1, 0)
+#define LMK04832_REG_PLL2_N_CAL_1 0x164
+#define LMK04832_REG_PLL2_N_CAL_2 0x165
+#define LMK04832_REG_PLL2_N_0 0x166
+#define LMK04832_BIT_PLL2_N_0 GENMASK(1, 0)
+#define LMK04832_REG_PLL2_N_1 0x167
+#define LMK04832_REG_PLL2_N_2 0x168
+#define LMK04832_REG_PLL2_DLD_CNT_LSB 0x16b
+#define LMK04832_REG_PLL2_LD 0x16e
+#define LMK04832_BIT_PLL2_LD_MUX GENMASK(7, 3)
+#define LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD 0x02
+#define LMK04832_BIT_PLL2_LD_TYPE GENMASK(2, 0)
+#define LMK04832_VAL_PLL2_LD_TYPE_OUT_PP 0x03
+
+/* 0x16F - 0x555 Misc Registers */
+#define LMK04832_REG_PLL2_PD 0x173
+#define LMK04832_BIT_PLL2_PRE_PD BIT(6)
+#define LMK04832_BIT_PLL2_PD BIT(5)
+#define LMK04832_REG_PLL1R_RST 0x177
+#define LMK04832_REG_CLR_PLL_LOST 0x182
+#define LMK04832_REG_RB_PLL_LD 0x183
+#define LMK04832_REG_RB_CLK_DAC_VAL_MSB 0x184
+#define LMK04832_REG_RB_DAC_VAL_LSB 0x185
+#define LMK04832_REG_RB_HOLDOVER 0x188
+#define LMK04832_REG_SPI_LOCK 0x555
+
+enum lmk04832_device_types {
+ LMK04832,
+};
+
+/**
+ * lmk04832_device_info - Holds static device information that is specific to
+ * the chip revision
+ *
+ * pid: Product Identifier
+ * maskrev: IC version identifier
+ * num_channels: Number of available output channels (clkout count)
+ * vco0_range: {min, max} of the VCO0 operating range (in MHz)
+ * vco1_range: {min, max} of the VCO1 operating range (in MHz)
+ */
+struct lmk04832_device_info {
+ u16 pid;
+ u8 maskrev;
+ size_t num_channels;
+ unsigned int vco0_range[2];
+ unsigned int vco1_range[2];
+};
+
+const struct lmk04832_device_info lmk04832_device_info[] = {
+ [LMK04832] = {
+ .pid = 0x63d1, /* WARNING PROD_ID is inverted in the datasheet */
+ .maskrev = 0x70,
+ .num_channels = 14,
+ .vco0_range = { 2440, 2580 },
+ .vco1_range = { 2945, 3255 },
+ },
+};
+
+enum lmk04832_rdbk_type {
+ RDBK_CLKIN_SEL0,
+ RDBK_CLKIN_SEL1,
+ RDBK_RESET,
+};
+
+struct lmk_dclk {
+ struct lmk04832 *lmk;
+ struct clk_hw hw;
+ u8 id;
+};
+
+struct lmk_clkout {
+ struct lmk04832 *lmk;
+ struct clk_hw hw;
+ bool sysref;
+ u32 format;
+ u8 id;
+};
+
+/**
+ * struct lmk04832 - The LMK04832 device structure
+ *
+ * @dev: reference to a struct device, linked to the spi_device
+ * @regmap: struct regmap instance use to access the chip
+ * @oscin: PLL2 input clock
+ * @vco: reference to the internal VCO clock
+ * @sclk: reference to the internal sysref clock (SCLK)
+ * @vco_rate: user provided VCO rate
+ * @reset_gpio: reference to the reset GPIO
+ * @dclk: list of internal device clock references.
+ * Each pair of clkout clocks share a single device clock (DCLKX_Y)
+ * @clkout: list of output clock references
+ * @clk_data: holds clkout related data like clk_hw* and number of clocks
+ */
+struct lmk04832 {
+ struct device *dev;
+ struct regmap *regmap;
+
+ struct clk *oscin;
+ struct clk_hw vco;
+ struct clk_hw sclk;
+ unsigned int vco_rate;
+
+ struct gpio_desc *reset_gpio;
+
+ struct lmk_dclk *dclk;
+ struct lmk_clkout *clkout;
+ struct clk_hw_onecell_data *clk_data;
+};
+
+static bool lmk04832_regmap_rd_regs(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMK04832_REG_RST3W ... LMK04832_REG_ID_MASKREV:
+ fallthrough;
+ case LMK04832_REG_ID_VNDR_MSB:
+ fallthrough;
+ case LMK04832_REG_ID_VNDR_LSB:
+ fallthrough;
+ case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB:
+ fallthrough;
+ case LMK04832_REG_PLL2_LD:
+ fallthrough;
+ case LMK04832_REG_PLL2_PD:
+ fallthrough;
+ case LMK04832_REG_PLL1R_RST:
+ fallthrough;
+ case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB:
+ fallthrough;
+ case LMK04832_REG_RB_HOLDOVER:
+ fallthrough;
+ case LMK04832_REG_SPI_LOCK:
+ return true;
+ default:
+ return false;
+ };
+};
+
+static bool lmk04832_regmap_wr_regs(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMK04832_REG_RST3W:
+ fallthrough;
+ case LMK04832_REG_POWERDOWN:
+ return true;
+ case LMK04832_REG_ID_DEV_TYPE ... LMK04832_REG_ID_MASKREV:
+ fallthrough;
+ case LMK04832_REG_ID_VNDR_MSB:
+ fallthrough;
+ case LMK04832_REG_ID_VNDR_LSB:
+ return false;
+ case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB:
+ fallthrough;
+ case LMK04832_REG_PLL2_LD:
+ fallthrough;
+ case LMK04832_REG_PLL2_PD:
+ fallthrough;
+ case LMK04832_REG_PLL1R_RST:
+ fallthrough;
+ case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB:
+ fallthrough;
+ case LMK04832_REG_RB_HOLDOVER:
+ fallthrough;
+ case LMK04832_REG_SPI_LOCK:
+ return true;
+ default:
+ return false;
+ };
+};
+
+static const struct regmap_config regmap_config = {
+ .name = "lmk04832",
+ .reg_bits = 16,
+ .val_bits = 8,
+ .use_single_read = 1,
+ .use_single_write = 1,
+ .read_flag_mask = 0x80,
+ .write_flag_mask = 0x00,
+ .readable_reg = lmk04832_regmap_rd_regs,
+ .writeable_reg = lmk04832_regmap_wr_regs,
+ .cache_type = REGCACHE_NONE,
+ .max_register = LMK04832_REG_SPI_LOCK,
+};
+
+static int lmk04832_vco_is_enabled(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+ unsigned int tmp;
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp);
+ if (ret)
+ return ret;
+
+ return !(FIELD_GET(LMK04832_BIT_OSCIN_PD, tmp) |
+ FIELD_GET(LMK04832_BIT_VCO_PD, tmp) |
+ FIELD_GET(LMK04832_BIT_VCO_LDO_PD, tmp));
+}
+
+static int lmk04832_vco_prepare(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+ int ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD,
+ LMK04832_BIT_PLL2_PRE_PD |
+ LMK04832_BIT_PLL2_PD,
+ 0x00);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_VCO_LDO_PD |
+ LMK04832_BIT_VCO_PD |
+ LMK04832_BIT_OSCIN_PD, 0x00);
+}
+
+static void lmk04832_vco_unprepare(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+
+ regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD,
+ LMK04832_BIT_PLL2_PRE_PD | LMK04832_BIT_PLL2_PD,
+ 0xff);
+
+ /* Don't set LMK04832_BIT_OSCIN_PD since other clocks depend on it */
+ regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_VCO_LDO_PD | LMK04832_BIT_VCO_PD, 0xff);
+}
+
+static unsigned long lmk04832_vco_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+ unsigned int pll2_p[] = {8, 2, 2, 3, 4, 5, 6, 7};
+ unsigned int pll2_n, p, pll2_r;
+ unsigned int pll2_misc;
+ unsigned long vco_rate;
+ u8 tmp[3];
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_PLL2_MISC, &pll2_misc);
+ if (ret)
+ return ret;
+
+ p = FIELD_GET(LMK04832_BIT_PLL2_MISC_P, pll2_misc);
+
+ ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_N_0, &tmp, 3);
+ if (ret)
+ return ret;
+
+ pll2_n = FIELD_PREP(0x030000, tmp[0]) |
+ FIELD_PREP(0x00ff00, tmp[1]) |
+ FIELD_PREP(0x0000ff, tmp[2]);
+
+ ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_R_MSB, &tmp, 2);
+ if (ret)
+ return ret;
+
+ pll2_r = FIELD_PREP(0x0f00, tmp[0]) |
+ FIELD_PREP(0x00ff, tmp[1]);
+
+ vco_rate = (prate << FIELD_GET(LMK04832_BIT_PLL2_MISC_REF_2X_EN,
+ pll2_misc)) * pll2_n * pll2_p[p] / pll2_r;
+
+ return vco_rate;
+};
+
+/**
+ * lmk04832_check_vco_ranges - Check requested VCO frequency against VCO ranges
+ *
+ * @lmk: Reference to the lmk device
+ * @rate: Desired output rate for the VCO
+ *
+ * The LMK04832 has 2 internal VCO, each with independant operating ranges.
+ * Use the device_info structure to determine which VCO to use based on rate.
+ *
+ * Returns VCO_MUX value or negative errno.
+ */
+static int lmk04832_check_vco_ranges(struct lmk04832 *lmk, unsigned long rate)
+{
+ struct spi_device *spi = to_spi_device(lmk->dev);
+ const struct lmk04832_device_info *info;
+ unsigned long mhz = rate / 1000000;
+
+ info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data];
+
+ if (mhz >= info->vco0_range[0] && mhz <= info->vco0_range[1]) {
+ return LMK04832_VAL_VCO_MUX_VCO0;
+ } else if (mhz >= info->vco1_range[0] && mhz <= info->vco1_range[1]) {
+ return LMK04832_VAL_VCO_MUX_VCO1;
+ } else {
+ dev_err(lmk->dev, "%lu Hz is out of VCO ranges\n", rate);
+ return -ERANGE;
+ }
+}
+
+/**
+ * lmk04832_calc_pll2_params - Get PLL2 parameters used to set the VCO frequency
+ *
+ * @prate: parent rate to the PLL2, usually OSCin
+ * @rate: Desired output rate for the VCO
+ * @n: reference to PLL2_N
+ * @p: reference to PLL2_P
+ * @r: reference to PLL2_R
+ *
+ * This functions assumes LMK04832_BIT_PLL2_MISC_REF_2X_EN is set since it is
+ * recommended in the datasheet because a higher phase detector frequencies
+ * makes the design of wider loop bandwidth filters possible.
+ *
+ * the VCO rate can be calculated using the following expression:
+ *
+ * VCO = OSCin * 2 * PLL2_N * PLL2_P / PLL2_R
+ *
+ * Returns vco rate or negative errno.
+ */
+static long lmk04832_calc_pll2_params(unsigned long prate, unsigned long rate,
+ unsigned int *n, unsigned int *p,
+ unsigned int *r)
+{
+ unsigned int pll2_n, pll2_p, pll2_r;
+ unsigned long num, div;
+
+ /* Set PLL2_P to a fixed value to simplify optimizations */
+ pll2_p = 2;
+
+ div = gcd(rate, prate);
+
+ num = DIV_ROUND_CLOSEST(rate, div);
+ pll2_r = DIV_ROUND_CLOSEST(prate, div);
+
+ if (num > 4) {
+ pll2_n = num >> 2;
+ } else {
+ pll2_r = pll2_r << 2;
+ pll2_n = num;
+ }
+
+ if (pll2_n < 1 || pll2_n > 0x03ffff)
+ return -EINVAL;
+ if (pll2_r < 1 || pll2_r > 0xfff)
+ return -EINVAL;
+
+ *n = pll2_n;
+ *p = pll2_p;
+ *r = pll2_r;
+
+ return DIV_ROUND_CLOSEST(prate * 2 * pll2_p * pll2_n, pll2_r);
+}
+
+static long lmk04832_vco_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+ unsigned int n, p, r;
+ long vco_rate;
+ int ret;
+
+ ret = lmk04832_check_vco_ranges(lmk, rate);
+ if (rate < 0)
+ return ret;
+
+ vco_rate = lmk04832_calc_pll2_params(*prate, rate, &n, &p, &r);
+ if (vco_rate < 0) {
+ dev_err(lmk->dev, "PLL2 parmeters out of range\n");
+ return vco_rate;
+ }
+
+ if (rate != vco_rate)
+ return -EINVAL;
+
+ return vco_rate;
+};
+
+static int lmk04832_vco_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
+ unsigned int n, p, r;
+ long vco_rate;
+ int vco_mux;
+ int ret;
+
+ vco_mux = lmk04832_check_vco_ranges(lmk, rate);
+ if (vco_mux < 0)
+ return vco_mux;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT,
+ LMK04832_BIT_VCO_MUX,
+ FIELD_PREP(LMK04832_BIT_VCO_MUX, vco_mux));
+ if (ret)
+ return ret;
+
+ vco_rate = lmk04832_calc_pll2_params(prate, rate, &n, &p, &r);
+ if (vco_rate < 0) {
+ dev_err(lmk->dev, "failed to determine PLL2 parmeters\n");
+ return vco_rate;
+ }
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_R_MSB,
+ LMK04832_BIT_PLL2_R_MSB,
+ FIELD_GET(0x000700, r));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_R_LSB,
+ FIELD_GET(0x0000ff, r));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC,
+ LMK04832_BIT_PLL2_MISC_P,
+ FIELD_PREP(LMK04832_BIT_PLL2_MISC_P, p));
+ if (ret)
+ return ret;
+
+ /*
+ * PLL2_N registers must be programmed after other PLL2 dividers are
+ * programed to ensure proper VCO frequency calibration
+ */
+ ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_0,
+ FIELD_GET(0x030000, n));
+ if (ret)
+ return ret;
+ ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_1,
+ FIELD_GET(0x00ff00, n));
+ if (ret)
+ return ret;
+
+ return regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_2,
+ FIELD_GET(0x0000ff, n));
+};
+
+static const struct clk_ops lmk04832_vco_ops = {
+ .is_enabled = lmk04832_vco_is_enabled,
+ .prepare = lmk04832_vco_prepare,
+ .unprepare = lmk04832_vco_unprepare,
+ .recalc_rate = lmk04832_vco_recalc_rate,
+ .round_rate = lmk04832_vco_round_rate,
+ .set_rate = lmk04832_vco_set_rate,
+};
+
+/*
+ * lmk04832_register_vco - Initialize the internal VCO and clock distribution
+ * path in PLL2 single loop mode.
+ */
+static int lmk04832_register_vco(struct lmk04832 *lmk)
+{
+ const char *parent_names[1];
+ struct clk_init_data init;
+ int ret;
+
+ init.name = "lmk-vco";
+ parent_names[0] = __clk_get_name(lmk->oscin);
+ init.parent_names = parent_names;
+
+ init.ops = &lmk04832_vco_ops;
+ init.num_parents = 1;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT,
+ LMK04832_BIT_VCO_MUX,
+ FIELD_PREP(LMK04832_BIT_VCO_MUX,
+ LMK04832_VAL_VCO_MUX_VCO1));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_FB_CTRL,
+ LMK04832_BIT_PLL2_RCLK_MUX |
+ LMK04832_BIT_PLL2_NCLK_MUX,
+ FIELD_PREP(LMK04832_BIT_PLL2_RCLK_MUX,
+ LMK04832_VAL_PLL2_RCLK_MUX_OSCIN)|
+ FIELD_PREP(LMK04832_BIT_PLL2_NCLK_MUX,
+ LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC,
+ LMK04832_BIT_PLL2_MISC_REF_2X_EN,
+ LMK04832_BIT_PLL2_MISC_REF_2X_EN);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_LD,
+ FIELD_PREP(LMK04832_BIT_PLL2_LD_MUX,
+ LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD) |
+ FIELD_PREP(LMK04832_BIT_PLL2_LD_TYPE,
+ LMK04832_VAL_PLL2_LD_TYPE_OUT_PP));
+ if (ret)
+ return ret;
+
+ lmk->vco.init = &init;
+ return devm_clk_hw_register(lmk->dev, &lmk->vco);
+}
+
+static int lmk04832_sclk_is_enabled(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+ unsigned int tmp;
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp);
+ if (ret)
+ return ret;
+
+ return FIELD_GET(LMK04832_BIT_SYSREF_PD, tmp);
+}
+
+static int lmk04832_sclk_prepare(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+
+ return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_SYSREF_PD, 0x00);
+}
+
+static void lmk04832_sclk_unprepare(struct clk_hw *hw)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+
+ regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_SYSREF_PD, LMK04832_BIT_SYSREF_PD);
+}
+
+static unsigned long lmk04832_sclk_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+ unsigned int sysref_div;
+ u8 tmp[2];
+ int ret;
+
+ ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB, &tmp, 2);
+ if (ret)
+ return ret;
+
+ sysref_div = FIELD_GET(LMK04832_BIT_SYSREF_DIV_MSB, tmp[0]) << 8 |
+ tmp[1];
+
+ return DIV_ROUND_CLOSEST(prate, sysref_div);
+}
+
+static long lmk04832_sclk_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+ unsigned long sclk_rate;
+ unsigned int sysref_div;
+
+ sysref_div = DIV_ROUND_CLOSEST(*prate, rate);
+ sclk_rate = DIV_ROUND_CLOSEST(*prate, sysref_div);
+
+ if (sysref_div < 0x07 || sysref_div > 0x1fff) {
+ dev_err(lmk->dev, "SYSREF divider out of range\n");
+ return -EINVAL;
+ }
+
+ if (rate != sclk_rate)
+ return -EINVAL;
+
+ return sclk_rate;
+}
+
+static int lmk04832_sclk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
+ unsigned int sysref_div;
+ int ret;
+
+ sysref_div = DIV_ROUND_CLOSEST(prate, rate);
+
+ if (sysref_div < 0x07 || sysref_div > 0x1fff) {
+ dev_err(lmk->dev, "SYSREF divider out of range\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB,
+ FIELD_GET(0x1f00, sysref_div));
+ if (ret)
+ return ret;
+
+ return regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_LSB,
+ FIELD_GET(0x00ff, sysref_div));
+}
+
+static const struct clk_ops lmk04832_sclk_ops = {
+ .is_enabled = lmk04832_sclk_is_enabled,
+ .prepare = lmk04832_sclk_prepare,
+ .unprepare = lmk04832_sclk_unprepare,
+ .recalc_rate = lmk04832_sclk_recalc_rate,
+ .round_rate = lmk04832_sclk_round_rate,
+ .set_rate = lmk04832_sclk_set_rate,
+};
+
+static int lmk04832_register_sclk(struct lmk04832 *lmk)
+{
+ const char *parent_names[1];
+ struct clk_init_data init;
+ int ret;
+
+ init.name = "lmk-sclk";
+ parent_names[0] = clk_hw_get_name(&lmk->vco);
+ init.parent_names = parent_names;
+
+ init.ops = &lmk04832_sclk_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.num_parents = 1;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
+ LMK04832_BIT_SYSREF_MUX,
+ FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
+ LMK04832_VAL_SYSREF_MUX_CONTINUOUS));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_SYSREF_PLSR_PD,
+ LMK04832_BIT_SYSREF_PLSR_PD);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_EN, 0xff);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff);
+ if (ret)
+ return ret;
+
+ lmk->sclk.init = &init;
+ return devm_clk_hw_register(lmk->dev, &lmk->sclk);
+}
+
+static int lmk04832_dclk_is_enabled(struct clk_hw *hw)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+ unsigned int tmp;
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(dclk->id),
+ &tmp);
+ if (ret)
+ return ret;
+
+ return !FIELD_GET(LMK04832_BIT_DCLKX_Y_PD, tmp);
+}
+
+static int lmk04832_dclk_prepare(struct clk_hw *hw)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+
+ return regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL3(dclk->id),
+ LMK04832_BIT_DCLKX_Y_PD, 0x00);
+}
+
+static void lmk04832_dclk_unprepare(struct clk_hw *hw)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+
+ regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL3(dclk->id),
+ LMK04832_BIT_DCLKX_Y_PD, 0xff);
+}
+
+static unsigned long lmk04832_dclk_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+ unsigned int dclk_div;
+ unsigned int lsb, msb;
+ unsigned long rate;
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id),
+ &lsb);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(dclk->id),
+ &msb);
+ if (ret)
+ return ret;
+
+ dclk_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb;
+ rate = DIV_ROUND_CLOSEST(prate, dclk_div);
+
+ return rate;
+};
+
+static long lmk04832_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+ unsigned long dclk_rate;
+ unsigned int dclk_div;
+
+ dclk_div = DIV_ROUND_CLOSEST(*prate, rate);
+ dclk_rate = DIV_ROUND_CLOSEST(*prate, dclk_div);
+
+ if (dclk_div < 1 || dclk_div > 0x3ff) {
+ dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw));
+ return -EINVAL;
+ }
+
+ if (rate != dclk_rate)
+ return -EINVAL;
+
+ return dclk_rate;
+};
+
+static int lmk04832_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long prate)
+{
+ struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
+ struct lmk04832 *lmk = dclk->lmk;
+ unsigned int dclk_div;
+ int ret;
+
+ dclk_div = DIV_ROUND_CLOSEST(prate, rate);
+
+ if (dclk_div > 0x3ff) {
+ dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw));
+ return -EINVAL;
+ }
+
+ /* Enable Duty Cycle Corretion */
+ if (dclk_div == 1) {
+ ret = regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL3(dclk->id),
+ LMK04832_BIT_DCLKX_Y_DCC,
+ FIELD_PREP(LMK04832_BIT_DCLKX_Y_DCC, 1));
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id),
+ FIELD_GET(0x0ff, dclk_div));
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL2(dclk->id),
+ LMK04832_BIT_DCLK_DIV_MSB,
+ FIELD_GET(0x300, dclk_div));
+};
+
+static const struct clk_ops lmk04832_dclk_ops = {
+ .is_enabled = lmk04832_dclk_is_enabled,
+ .prepare = lmk04832_dclk_prepare,
+ .unprepare = lmk04832_dclk_unprepare,
+ .recalc_rate = lmk04832_dclk_recalc_rate,
+ .round_rate = lmk04832_dclk_round_rate,
+ .set_rate = lmk04832_dclk_set_rate,
+};
+
+static int lmk04832_clkout_is_enabled(struct clk_hw *hw)
+{
+ struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
+ struct lmk04832 *lmk = clkout->lmk;
+ unsigned int clkoutx_y_pd;
+ unsigned int sclkx_y_pd;
+ unsigned int tmp;
+ u32 enabled;
+ int ret;
+ u8 fmt;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(clkout->id),
+ &clkoutx_y_pd);
+ if (ret)
+ return ret;
+
+ enabled = !FIELD_GET(LMK04832_BIT_CLKOUTX_Y_PD, clkoutx_y_pd);
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
+ &tmp);
+ if (ret)
+ return ret;
+
+ if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) {
+ ret = regmap_read(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL4(clkout->id),
+ &sclkx_y_pd);
+ if (ret)
+ return ret;
+
+ enabled = enabled && !FIELD_GET(LMK04832_BIT_SCLK_PD, sclkx_y_pd);
+ }
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id),
+ &tmp);
+ if (ret)
+ return ret;
+
+ if (clkout->id % 2)
+ fmt = FIELD_GET(0xf0, tmp);
+ else
+ fmt = FIELD_GET(0x0f, tmp);
+
+ return enabled && !fmt;
+}
+
+static int lmk04832_clkout_prepare(struct clk_hw *hw)
+{
+ struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
+ struct lmk04832 *lmk = clkout->lmk;
+ unsigned int tmp;
+ int ret;
+
+ if (clkout->format == LMK04832_VAL_CLKOUT_FMT_POWERDOWN)
+ dev_err(lmk->dev, "prepared %s but format is powerdown\n",
+ clk_hw_get_name(hw));
+
+ ret = regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL2(clkout->id),
+ LMK04832_BIT_CLKOUTX_Y_PD, 0x00);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
+ &tmp);
+ if (ret)
+ return ret;
+
+ if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) {
+ ret = regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL4(clkout->id),
+ LMK04832_BIT_SCLK_PD, 0x00);
+ if (ret)
+ return ret;
+ }
+
+ return regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_FMT(clkout->id),
+ LMK04832_BIT_CLKOUT_FMT(clkout->id),
+ clkout->format << 4 * (clkout->id % 2));
+}
+
+static void lmk04832_clkout_unprepare(struct clk_hw *hw)
+{
+ struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
+ struct lmk04832 *lmk = clkout->lmk;
+
+ regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id),
+ LMK04832_BIT_CLKOUT_FMT(clkout->id),
+ 0x00);
+}
+
+static int lmk04832_clkout_set_parent(struct clk_hw *hw, uint8_t index)
+{
+ struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
+ struct lmk04832 *lmk = clkout->lmk;
+
+ return regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
+ LMK04832_BIT_CLKOUT_SRC_MUX,
+ FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX,
+ index));
+}
+
+static uint8_t lmk04832_clkout_get_parent(struct clk_hw *hw)
+{
+ struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
+ struct lmk04832 *lmk = clkout->lmk;
+ unsigned int tmp;
+ int ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
+ &tmp);
+ if (ret)
+ return ret;
+
+ return FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp);
+}
+
+static const struct clk_ops lmk04832_clkout_ops = {
+ .is_enabled = lmk04832_clkout_is_enabled,
+ .prepare = lmk04832_clkout_prepare,
+ .unprepare = lmk04832_clkout_unprepare,
+ .set_parent = lmk04832_clkout_set_parent,
+ .get_parent = lmk04832_clkout_get_parent,
+};
+
+static int lmk04832_register_clkout(struct lmk04832 *lmk, const int num)
+{
+ char name[] = "lmk-clkoutXX";
+ char dclk_name[] = "lmk-dclkXX_YY";
+ const char *parent_names[2];
+ struct clk_init_data init;
+ int dclk_num = num / 2;
+ int ret;
+
+ if (num % 2 == 0) {
+ sprintf(dclk_name, "lmk-dclk%02d_%02d", num, num + 1);
+ init.name = dclk_name;
+ parent_names[0] = clk_hw_get_name(&lmk->vco);
+ init.ops = &lmk04832_dclk_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ init.num_parents = 1;
+
+ lmk->dclk[dclk_num].id = num;
+ lmk->dclk[dclk_num].lmk = lmk;
+ lmk->dclk[dclk_num].hw.init = &init;
+
+ ret = devm_clk_hw_register(lmk->dev, &lmk->dclk[dclk_num].hw);
+ if (ret)
+ return ret;
+ } else {
+ sprintf(dclk_name, "lmk-dclk%02d_%02d", num - 1, num);
+ }
+
+ if (of_property_read_string_index(lmk->dev->of_node,
+ "clock-output-names",
+ num, &init.name)) {
+ sprintf(name, "lmk-clkout%02d", num);
+ init.name = name;
+ }
+
+ parent_names[0] = dclk_name;
+ parent_names[1] = clk_hw_get_name(&lmk->sclk);
+ init.parent_names = parent_names;
+ init.ops = &lmk04832_clkout_ops;
+ init.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT;
+ init.num_parents = ARRAY_SIZE(parent_names);
+
+ lmk->clkout[num].id = num;
+ lmk->clkout[num].lmk = lmk;
+ lmk->clkout[num].hw.init = &init;
+ lmk->clk_data->hws[num] = &lmk->clkout[num].hw;
+
+ /* Set initial parent */
+ regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_SRC_MUX(num),
+ LMK04832_BIT_CLKOUT_SRC_MUX,
+ FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX,
+ lmk->clkout[num].sysref));
+
+ return devm_clk_hw_register(lmk->dev, &lmk->clkout[num].hw);
+}
+
+static int lmk04832_set_spi_rdbk(const struct lmk04832 *lmk, const int rdbk_pin)
+{
+ int reg;
+ int ret;
+
+ dev_info(lmk->dev, "setting up 4-wire mode\n");
+ ret = regmap_write(lmk->regmap, LMK04832_REG_RST3W,
+ LMK04832_BIT_SPI_3WIRE_DIS);
+ if (ret)
+ return ret;
+
+ switch (rdbk_pin) {
+ case RDBK_CLKIN_SEL0:
+ reg = LMK04832_REG_CLKIN_SEL0;
+ break;
+ case RDBK_CLKIN_SEL1:
+ reg = LMK04832_REG_CLKIN_SEL1;
+ break;
+ case RDBK_RESET:
+ reg = LMK04832_REG_CLKIN_RST;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_write(lmk->regmap, reg,
+ FIELD_PREP(LMK04832_BIT_CLKIN_SEL_MUX,
+ LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK) |
+ FIELD_PREP(LMK04832_BIT_CLKIN_SEL_TYPE,
+ LMK04832_VAL_CLKIN_SEL_TYPE_OUT));
+}
+
+static int lmk04832_probe(struct spi_device *spi)
+{
+ const struct lmk04832_device_info *info;
+ int rdbk_pin = RDBK_CLKIN_SEL1;
+ struct device_node *child;
+ struct lmk04832 *lmk;
+ u8 tmp[3];
+ int ret;
+ int i;
+
+ info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data];
+
+ lmk = devm_kzalloc(&spi->dev, sizeof(struct lmk04832), GFP_KERNEL);
+ if (!lmk)
+ return -ENOMEM;
+
+ lmk->dev = &spi->dev;
+
+ lmk->oscin = devm_clk_get(lmk->dev, "oscin");
+ if (IS_ERR(lmk->oscin)) {
+ dev_err(lmk->dev, "failed to get oscin clock\n");
+ return PTR_ERR(lmk->oscin);
+ }
+
+ ret = clk_prepare_enable(lmk->oscin);
+ if (ret)
+ return ret;
+
+ lmk->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+ GPIOD_OUT_LOW);
+
+ lmk->dclk = devm_kcalloc(lmk->dev, info->num_channels >> 1,
+ sizeof(struct lmk_dclk), GFP_KERNEL);
+ if (IS_ERR(lmk->dclk)) {
+ ret = PTR_ERR(lmk->dclk);
+ goto err_disable_oscin;
+ }
+
+ lmk->clkout = devm_kcalloc(lmk->dev, info->num_channels,
+ sizeof(*lmk->clkout), GFP_KERNEL);
+ if (IS_ERR(lmk->clkout)) {
+ ret = PTR_ERR(lmk->clkout);
+ goto err_disable_oscin;
+ }
+
+ lmk->clk_data = devm_kzalloc(lmk->dev, struct_size(lmk->clk_data, hws,
+ info->num_channels),
+ GFP_KERNEL);
+ if (IS_ERR(lmk->clk_data)) {
+ ret = PTR_ERR(lmk->clk_data);
+ goto err_disable_oscin;
+ }
+
+ device_property_read_u32(lmk->dev, "ti,vco-hz", &lmk->vco_rate);
+
+ for_each_child_of_node(lmk->dev->of_node, child) {
+ int reg;
+
+ ret = of_property_read_u32(child, "reg", ®);
+ if (ret) {
+ dev_err(lmk->dev, "missing reg property in child: %s\n",
+ child->full_name);
+ goto err_disable_oscin;
+ }
+
+ of_property_read_u32(child, "ti,clkout-fmt",
+ &lmk->clkout[reg].format);
+
+ if (lmk->clkout[reg].format >= 0x0a && reg % 2 == 0
+ && reg != 8 && reg != 10)
+ dev_err(lmk->dev, "invalid format for clkout%02d\n",
+ reg);
+
+ lmk->clkout[reg].sysref =
+ of_property_read_bool(child, "ti,clkout-sysref");
+ };
+
+ lmk->regmap = devm_regmap_init_spi(spi, ®map_config);
+ if (IS_ERR(lmk->regmap)) {
+ dev_err(lmk->dev, "%s: regmap allocation failed: %ld\n",
+
+ __func__, PTR_ERR(lmk->regmap));
+ ret = PTR_ERR(lmk->regmap);
+ goto err_disable_oscin;
+ }
+
+ regmap_write(lmk->regmap, LMK04832_REG_RST3W, LMK04832_BIT_RESET);
+
+ if (!(spi->mode & SPI_3WIRE)) {
+ device_property_read_u32(lmk->dev, "ti,spi-4wire-rdbk",
+ &rdbk_pin);
+ ret = lmk04832_set_spi_rdbk(lmk, rdbk_pin);
+ if (ret)
+ goto err_disable_oscin;
+ }
+
+ regmap_bulk_read(lmk->regmap, LMK04832_REG_ID_PROD_MSB, &tmp, 3);
+ if ((tmp[0] << 8 | tmp[1]) != info->pid || tmp[2] != info->maskrev) {
+ dev_err(lmk->dev, "unsupported device type: pid 0x%04x, maskrev 0x%02x\n",
+ tmp[0] << 8 | tmp[1], tmp[2]);
+ ret = -EINVAL;
+ goto err_disable_oscin;
+ }
+
+ ret = lmk04832_register_vco(lmk);
+ if (ret) {
+ dev_err(lmk->dev, "failed to init device clock path\n");
+ goto err_disable_oscin;
+ }
+
+ if (lmk->vco_rate) {
+ dev_info(lmk->dev, "setting VCO rate to %u Hz\n", lmk->vco_rate);
+ ret = clk_set_rate(lmk->vco.clk, lmk->vco_rate);
+ if (ret) {
+ dev_err(lmk->dev, "failed to set VCO rate\n");
+ goto err_disable_vco;
+ }
+ }
+
+ ret = lmk04832_register_sclk(lmk);
+ if (ret) {
+ dev_err(lmk->dev, "failed to init SYNC/SYSREF clock path\n");
+ goto err_disable_vco;
+ }
+
+ for (i = 0; i < info->num_channels; i++) {
+ ret = lmk04832_register_clkout(lmk, i);
+ if (ret) {
+ dev_err(lmk->dev, "failed to register clk %d\n", i);
+ goto err_disable_vco;
+ }
+ }
+
+ lmk->clk_data->num = info->num_channels;
+ ret = of_clk_add_hw_provider(lmk->dev->of_node, of_clk_hw_onecell_get,
+ lmk->clk_data);
+ if (ret) {
+ dev_err(lmk->dev, "failed to add provider (%d)\n", ret);
+ goto err_disable_vco;
+ }
+
+ spi_set_drvdata(spi, lmk);
+
+ return 0;
+
+err_disable_vco:
+ clk_disable_unprepare(lmk->vco.clk);
+
+err_disable_oscin:
+ clk_disable_unprepare(lmk->oscin);
+
+ return ret;
+}
+
+static int lmk04832_remove(struct spi_device *spi)
+{
+ struct lmk04832 *lmk = spi_get_drvdata(spi);
+
+ clk_disable_unprepare(lmk->oscin);
+ of_clk_del_provider(spi->dev.of_node);
+
+ return 0;
+}
+static const struct spi_device_id lmk04832_id[] = {
+ { "lmk04832", LMK04832 },
+ {},
+};
+MODULE_DEVICE_TABLE(spi, lmk04832_id);
+
+static const struct of_device_id lmk04832_of_id[] = {
+ { .compatible = "ti,lmk04832" },
+ {},
+};
+
+static struct spi_driver lmk04832_driver = {
+ .driver = {
+ .name = "lmk04832",
+ },
+ .probe = lmk04832_probe,
+ .remove = lmk04832_remove,
+ .id_table = lmk04832_id,
+};
+module_spi_driver(lmk04832_driver);
+
+MODULE_AUTHOR("Liam Beguin <lvb@xiphos.com>");
+MODULE_DESCRIPTION("Texas Instruments LMK04832");
+MODULE_LICENSE("GPL v2");
--
2.30.1.489.g328c10930387
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v3 2/3] clk: lmk04832: add support for digital delay
2021-02-24 2:31 [PATCH v3 0/3] add support for the lmk04832 Liam Beguin
2021-02-24 2:31 ` [PATCH v3 1/3] clk: " Liam Beguin
@ 2021-02-24 2:31 ` Liam Beguin
2021-02-24 2:31 ` [PATCH v3 3/3] dt-bindings: clock: add ti,lmk04832 bindings Liam Beguin
2 siblings, 0 replies; 5+ messages in thread
From: Liam Beguin @ 2021-02-24 2:31 UTC (permalink / raw)
To: liambeguin, mturquette, sboyd
Cc: linux-clk, linux-kernel, devicetree, robh+dt
From: Liam Beguin <lvb@xiphos.com>
The digital delay allows outputs to be delayed from 8 to 1023 VCO
cycles. The delay step can be as small as half the period of the clock
distribution path. For example, a 3.2-GHz VCO frequency results in
156.25-ps steps. The digital delay value takes effect on the clock
output phase after a SYNC event.
This is required to support JESD204B subclass 1.
Signed-off-by: Liam Beguin <lvb@xiphos.com>
---
drivers/clk/clk-lmk04832.c | 321 ++++++++++++++++++++++++++++++++++++-
1 file changed, 315 insertions(+), 6 deletions(-)
diff --git a/drivers/clk/clk-lmk04832.c b/drivers/clk/clk-lmk04832.c
index 387a60fa2111..5393088fa68e 100644
--- a/drivers/clk/clk-lmk04832.c
+++ b/drivers/clk/clk-lmk04832.c
@@ -36,16 +36,24 @@
#define LMK04832_REG_CLKOUT_CTRL0(ch) (0x100 + (ch >> 1) * 8)
#define LMK04832_BIT_DCLK_DIV_LSB GENMASK(7, 0)
#define LMK04832_REG_CLKOUT_CTRL1(ch) (0x101 + (ch >> 1) * 8)
+#define LMK04832_BIT_DCLKX_Y_DDLY_LSB GENMASK(7, 0)
#define LMK04832_REG_CLKOUT_CTRL2(ch) (0x102 + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUTX_Y_PD BIT(7)
+#define LMK04832_BIT_DCLKX_Y_DDLY_PD BIT(4)
+#define LMK04832_BIT_DCLKX_Y_DDLY_MSB GENMASK(3, 2)
#define LMK04832_BIT_DCLK_DIV_MSB GENMASK(1, 0)
#define LMK04832_REG_CLKOUT_SRC_MUX(ch) (0x103 + (ch % 2) + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUT_SRC_MUX BIT(5)
#define LMK04832_REG_CLKOUT_CTRL3(ch) (0x103 + (ch >> 1) * 8)
#define LMK04832_BIT_DCLKX_Y_PD BIT(4)
#define LMK04832_BIT_DCLKX_Y_DCC BIT(2)
+#define LMK04832_BIT_DCLKX_Y_HS BIT(0)
#define LMK04832_REG_CLKOUT_CTRL4(ch) (0x104 + (ch >> 1) * 8)
#define LMK04832_BIT_SCLK_PD BIT(4)
+#define LMK04832_BIT_SCLKX_Y_DIS_MODE GENMASK(3, 2)
+#define LMK04832_REG_SCLKX_Y_ADLY(ch) (0x105 + (ch >> 1) * 8)
+#define LMK04832_REG_SCLKX_Y_DDLY(ch) (0x106 + (ch >> 1) * 8)
+#define LMK04832_BIT_SCLKX_Y_DDLY GENMASK(3, 0)
#define LMK04832_REG_CLKOUT_FMT(ch) (0x107 + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUT_FMT(ch) (ch % 2 ? 0xf0 : 0x0f)
#define LMK04832_VAL_CLKOUT_FMT_POWERDOWN 0x00
@@ -72,11 +80,19 @@
#define LMK04832_VAL_VCO_MUX_VCO1 0x01
#define LMK04832_VAL_VCO_MUX_EXT 0x02
#define LMK04832_REG_SYSREF_OUT 0x139
+#define LMK04832_BIT_SYSREF_REQ_EN BIT(6)
#define LMK04832_BIT_SYSREF_MUX GENMASK(1, 0)
+#define LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC 0x00
+#define LMK04832_VAL_SYSREF_MUX_RECLK 0x01
+#define LMK04832_VAL_SYSREF_MUX_PULSER 0x02
#define LMK04832_VAL_SYSREF_MUX_CONTINUOUS 0x03
#define LMK04832_REG_SYSREF_DIV_MSB 0x13a
#define LMK04832_BIT_SYSREF_DIV_MSB GENMASK(4, 0)
#define LMK04832_REG_SYSREF_DIV_LSB 0x13b
+#define LMK04832_REG_SYSREF_DDLY_MSB 0x13c
+#define LMK04832_BIT_SYSREF_DDLY_MSB GENMASK(4, 0)
+#define LMK04832_REG_SYSREF_DDLY_LSB 0x13d
+#define LMK04832_REG_SYSREF_PULSE_CNT 0x13e
#define LMK04832_REG_FB_CTRL 0x13f
#define LMK04832_BIT_PLL2_RCLK_MUX BIT(7)
#define LMK04832_VAL_PLL2_RCLK_MUX_OSCIN 0x00
@@ -95,7 +111,15 @@
#define LMK04832_BIT_SYSREF_DDLY_PD BIT(1)
#define LMK04832_BIT_SYSREF_PLSR_PD BIT(0)
#define LMK04832_REG_SYNC 0x143
+#define LMK04832_BIT_SYNC_CLR BIT(7)
+#define LMK04832_BIT_SYNC_1SHOT_EN BIT(6)
+#define LMK04832_BIT_SYNC_POL BIT(5)
#define LMK04832_BIT_SYNC_EN BIT(4)
+#define LMK04832_BIT_SYNC_MODE GENMASK(1, 0)
+#define LMK04832_VAL_SYNC_MODE_OFF 0x00
+#define LMK04832_VAL_SYNC_MODE_ON 0x01
+#define LMK04832_VAL_SYNC_MODE_PULSER_PIN 0x02
+#define LMK04832_VAL_SYNC_MODE_PULSER_SPI 0x03
#define LMK04832_REG_SYNC_DIS 0x144
/* 0x146 - 0x14a CLKin Control */
@@ -127,6 +151,7 @@
#define LMK04832_BIT_PLL2_N_0 GENMASK(1, 0)
#define LMK04832_REG_PLL2_N_1 0x167
#define LMK04832_REG_PLL2_N_2 0x168
+#define LMK04832_REG_PLL2_DLD_CNT_MSB 0x16a
#define LMK04832_REG_PLL2_DLD_CNT_LSB 0x16b
#define LMK04832_REG_PLL2_LD 0x16e
#define LMK04832_BIT_PLL2_LD_MUX GENMASK(7, 3)
@@ -203,6 +228,11 @@ struct lmk_clkout {
*
* @dev: reference to a struct device, linked to the spi_device
* @regmap: struct regmap instance use to access the chip
+ * @sync_mode: operational mode for SYNC signal
+ * @sysref_mux: select SYSREF source
+ * @sysref_pulse_cnt: number of SYSREF pulses generated while not in continuous
+ * mode.
+ * @sysref_ddly: SYSREF digital delay value
* @oscin: PLL2 input clock
* @vco: reference to the internal VCO clock
* @sclk: reference to the internal sysref clock (SCLK)
@@ -217,6 +247,11 @@ struct lmk04832 {
struct device *dev;
struct regmap *regmap;
+ unsigned int sync_mode;
+ unsigned int sysref_mux;
+ unsigned int sysref_pulse_cnt;
+ unsigned int sysref_ddly;
+
struct clk *oscin;
struct clk_hw vco;
struct clk_hw sclk;
@@ -613,6 +648,212 @@ static int lmk04832_register_vco(struct lmk04832 *lmk)
return devm_clk_hw_register(lmk->dev, &lmk->vco);
}
+static int lmk04832_clkout_set_ddly(struct lmk04832 *lmk, int id)
+{
+ int dclk_div_adj[] = {0, 0, -2, -2, 0, 3, -1, 0};
+ unsigned int sclkx_y_ddly = 10;
+ unsigned int dclkx_y_ddly;
+ unsigned int dclkx_y_div;
+ unsigned int sysref_ddly;
+ unsigned int dclkx_y_hs;
+ unsigned int lsb, msb;
+ int ret;
+
+ ret = regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL2(id),
+ LMK04832_BIT_DCLKX_Y_DDLY_PD,
+ FIELD_PREP(LMK04832_BIT_DCLKX_Y_DDLY_PD, 0));
+ if (ret)
+ return ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB, &lsb);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB, &msb);
+ if (ret)
+ return ret;
+
+ sysref_ddly = FIELD_GET(LMK04832_BIT_SYSREF_DDLY_MSB, msb) << 8 | lsb;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(id), &lsb);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id), &msb);
+ if (ret)
+ return ret;
+
+ dclkx_y_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb;
+
+ ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(id), &lsb);
+ if (ret)
+ return ret;
+
+ dclkx_y_hs = FIELD_GET(LMK04832_BIT_DCLKX_Y_HS, lsb);
+
+ dclkx_y_ddly = sysref_ddly + 1 -
+ dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7] -
+ dclkx_y_hs + sclkx_y_ddly;
+
+ if (dclkx_y_ddly < 7 || dclkx_y_ddly > 0x3fff) {
+ dev_err(lmk->dev, "DCLKX_Y_DDLY out of range (%d)\n",
+ dclkx_y_ddly);
+ return -EINVAL;
+ }
+
+ ret = regmap_write(lmk->regmap,
+ LMK04832_REG_SCLKX_Y_DDLY(id),
+ FIELD_GET(LMK04832_BIT_SCLKX_Y_DDLY, sclkx_y_ddly));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL1(id),
+ FIELD_GET(0x00ff, dclkx_y_ddly));
+ if (ret)
+ return ret;
+
+ dev_dbg(lmk->dev, "clkout%02u: sysref_ddly=%u, dclkx_y_ddly=%u, "
+ "dclk_div_adj=%+d, dclkx_y_hs=%u, sclkx_y_ddly=%u\n",
+ id, sysref_ddly, dclkx_y_ddly,
+ dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7],
+ dclkx_y_hs, sclkx_y_ddly);
+
+ return regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id),
+ LMK04832_BIT_DCLKX_Y_DDLY_MSB,
+ FIELD_GET(0x0300, dclkx_y_ddly));
+}
+
+/** lmk04832_sclk_sync - Establish deterministic phase relationship between sclk
+ * and dclk
+ *
+ * @lmk: Reference to the lmk device
+ *
+ * The synchronization sequence:
+ * - in the datasheet https://www.ti.com/lit/ds/symlink/lmk04832.pdf, p.31
+ * (8.3.3.1 How to enable SYSREF)
+ * - Ti forum: https://e2e.ti.com/support/clock-and-timing/f/48/t/970972
+ *
+ * Returns 0 or negative errno.
+ */
+static int lmk04832_sclk_sync_sequence(struct lmk04832 *lmk)
+{
+ int ret;
+ int i;
+
+ /* 1. (optional) mute all sysref_outputs during synchronization */
+ /* 2. Enable and write device clock digital delay to applicable clocks */
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_SYSREF_DDLY_PD,
+ FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0));
+ if (ret)
+ return ret;
+
+ for (i = 0; i < lmk->clk_data->num; i += 2) {
+ ret = lmk04832_clkout_set_ddly(lmk, i);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * 3. Configure SYNC_MODE to SYNC_PIN and SYSREF_MUX to Normal SYNC,
+ * and clear SYSREF_REQ_EN (see 6.)
+ */
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
+ LMK04832_BIT_SYSREF_REQ_EN |
+ LMK04832_BIT_SYSREF_MUX,
+ FIELD_PREP(LMK04832_BIT_SYSREF_REQ_EN, 0) |
+ FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
+ LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_MODE,
+ FIELD_PREP(LMK04832_BIT_SYNC_MODE,
+ LMK04832_VAL_SYNC_MODE_ON));
+ if (ret)
+ return ret;
+
+ /* 4. Clear SYNXC_DISx or applicable clocks and clear SYNC_DISSYSREF */
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0x00);
+ if (ret)
+ return ret;
+
+ /*
+ * 5. If SCLKX_Y_DDLY != 0, Set SYSREF_CLR=1 for at least 15 clock
+ * distribution path cycles (VCO cycles), then back to 0. In
+ * PLL2-only use case, this will be complete in less than one SPI
+ * transaction. If SYSREF local digital delay is not used, this step
+ * can be skipped.
+ */
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_CLR,
+ FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x01));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_CLR,
+ FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x00));
+ if (ret)
+ return ret;
+
+ /*
+ * 6. Toggle SYNC_POL state between inverted and not inverted.
+ * If you use an external signal on the SYNC pin instead of toggling
+ * SYNC_POL, make sure that SYSREF_REQ_EN=0 so that the SYSREF_MUX
+ * does not shift into continuous SYSREF mode.
+ */
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_POL,
+ FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x01));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_POL,
+ FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x00));
+ if (ret)
+ return ret;
+
+ /* 7. Set all SYNC_DISx=1, including SYNC_DISSYSREF */
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff);
+ if (ret)
+ return ret;
+
+ /* 8. Restore state of SYNC_MODE and SYSREF_MUX to desired values */
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
+ LMK04832_BIT_SYSREF_MUX,
+ FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
+ lmk->sysref_mux));
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
+ LMK04832_BIT_SYNC_MODE,
+ FIELD_PREP(LMK04832_BIT_SYNC_MODE,
+ lmk->sync_mode));
+ if (ret)
+ return ret;
+
+ /*
+ * 9. (optional) if SCLKx_y_DIS_MODE was used to mute SYSREF outputs
+ * during the SYNC event, restore SCLKx_y_DIS_MODE=0 for active state,
+ * or set SYSREF_GBL_PD=0 if SCLKx_y_DIS_MODE is set to a conditional
+ * option.
+ */
+
+ /*
+ * 10. (optional) To reduce power consumption, after the synchronization
+ * event is complete, DCLKx_y_DDLY_PD=1 and SYSREF_DDLY_PD=1 disable the
+ * digital delay counters (which are only used immediately after the
+ * SYNC pulse to delay the output by some number of VCO counts).
+ */
+
+ return ret;
+}
+
static int lmk04832_sclk_is_enabled(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
@@ -700,8 +941,16 @@ static int lmk04832_sclk_set_rate(struct clk_hw *hw, unsigned long rate,
if (ret)
return ret;
- return regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_LSB,
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_LSB,
FIELD_GET(0x00ff, sysref_div));
+ if (ret)
+ return ret;
+
+ ret = lmk04832_sclk_sync_sequence(lmk);
+ if (ret)
+ dev_err(lmk->dev, "SYNC sequence failed\n");
+
+ return ret;
}
static const struct clk_ops lmk04832_sclk_ops = {
@@ -730,18 +979,37 @@ static int lmk04832_register_sclk(struct lmk04832 *lmk)
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
LMK04832_BIT_SYSREF_MUX,
FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
- LMK04832_VAL_SYSREF_MUX_CONTINUOUS));
+ lmk->sysref_mux));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB,
+ FIELD_GET(0x00ff, lmk->sysref_ddly));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB,
+ FIELD_GET(0x1f00, lmk->sysref_ddly));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_PULSE_CNT,
+ ilog2(lmk->sysref_pulse_cnt));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
+ LMK04832_BIT_SYSREF_DDLY_PD |
LMK04832_BIT_SYSREF_PLSR_PD,
- LMK04832_BIT_SYSREF_PLSR_PD);
+ FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0) |
+ FIELD_PREP(LMK04832_BIT_SYSREF_PLSR_PD, 0));
if (ret)
return ret;
- ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
- LMK04832_BIT_SYNC_EN, 0xff);
+ ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC,
+ FIELD_PREP(LMK04832_BIT_SYNC_POL, 0) |
+ FIELD_PREP(LMK04832_BIT_SYNC_EN, 1) |
+ FIELD_PREP(LMK04832_BIT_SYNC_MODE, lmk->sync_mode));
if (ret)
return ret;
@@ -861,15 +1129,41 @@ static int lmk04832_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
return ret;
}
+ /*
+ * While using Divide-by-2 or Divide-by-3 for DCLK_X_Y_DIV, SYNC
+ * procedure requires to first program Divide-by-4 and then back to
+ * Divide-by-2 or Divide-by-3 before doing SYNC.
+ */
+ if (dclk_div == 2 || dclk_div == 3) {
+ ret = regmap_update_bits(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL2(dclk->id),
+ LMK04832_BIT_DCLK_DIV_MSB, 0x00);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(lmk->regmap,
+ LMK04832_REG_CLKOUT_CTRL0(dclk->id), 0x04);
+ if (ret)
+ return ret;
+ }
+
ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id),
FIELD_GET(0x0ff, dclk_div));
if (ret)
return ret;
- return regmap_update_bits(lmk->regmap,
+ ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL2(dclk->id),
LMK04832_BIT_DCLK_DIV_MSB,
FIELD_GET(0x300, dclk_div));
+ if (ret)
+ return ret;
+
+ ret = lmk04832_sclk_sync_sequence(lmk);
+ if (ret)
+ dev_err(lmk->dev, "SYNC sequence failed\n");
+
+ return ret;
};
static const struct clk_ops lmk04832_dclk_ops = {
@@ -1152,6 +1446,21 @@ static int lmk04832_probe(struct spi_device *spi)
device_property_read_u32(lmk->dev, "ti,vco-hz", &lmk->vco_rate);
+ lmk->sysref_ddly = 8;
+ device_property_read_u32(lmk->dev, "ti,sysref-ddly", &lmk->sysref_ddly);
+
+ lmk->sysref_mux = LMK04832_VAL_SYSREF_MUX_CONTINUOUS;
+ device_property_read_u32(lmk->dev, "ti,sysref-mux",
+ &lmk->sysref_mux);
+
+ lmk->sync_mode = LMK04832_VAL_SYNC_MODE_OFF;
+ device_property_read_u32(lmk->dev, "ti,sync-mode",
+ &lmk->sync_mode);
+
+ lmk->sysref_pulse_cnt = 4;
+ device_property_read_u32(lmk->dev, "ti,sysref-pulse-count",
+ &lmk->sysref_pulse_cnt);
+
for_each_child_of_node(lmk->dev->of_node, child) {
int reg;
--
2.30.1.489.g328c10930387
^ permalink raw reply related [flat|nested] 5+ messages in thread