Quoting Guenter Roeck (2013-12-14 08:33:27) > On 10/02/2013 04:17 PM, Mike Turquette wrote: > > Quoting Sören Brinkmann (2013-10-02 10:20:38) > >> Hi Mike, > >> > >> could you please comment on this/apply it to clk-next? > > > > It looks good and is in the queue. Will show up in clk-next in a few > > days. > > > Hi Mike, > > trying again ... what happened with this driver ? Any reason for not pushing it after all ? This got reverted with several other patches right before 3.12 dropped. Unfortunately clk-next broke linux-next two days before 3.12 came out and I had to revert to a known good state, excluding this driver. I've added it back to clk-next now towards 3.13. Sorry for the inconvenience. Regards, Mike > > Thanks, > Guenter > > > Thanks, > > Mike > > > >> > >> Thanks, > >> Sören > >> > >> On Sat, Sep 21, 2013 at 04:40:39PM -0700, Soren Brinkmann wrote: > >>> Add a driver for SILabs 570, 571, 598, 599 programmable oscillators. > >>> The devices generate low-jitter clock signals and are reprogrammable via > >>> an I2C interface. > >>> > >>> Cc: Guenter Roeck <linux@xxxxxxxxxxxx> > >>> Signed-off-by: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx> > >>> --- > >>> v5: > >>> - fix typo in bindings documentation > >>> - mention the unit for the 'temperature-stability' property > >>> - remove calls to clk_unregister() (the device managed code takes care > >>> of it) > >>> > >>> v4: > >>> - actually check and handle error on clk_set_rate() call > >>> > >>> v3: > >>> - add delay in the path for small frequency changes, which can take up > >>> to 100us according to the data sheet > >>> - use real range for usleep_range() argument > >>> - use dev_err() over dev_warn() in set_rate() > >>> - add list of applicable devices for 7ppm DT prop > >>> - remove comments regarding platform data > >>> - ignore 7ppm DT prop for incompatible devices > >>> - replace raw numbers with #defines > >>> - convert DT prop 'temperature-stability' from boolean to u32 > >>> - make 'temperature-stability' DT prop required (actually not fully > >>> true, for 59x it is ignored and the driver does not require its > >>> presence) > >>> > >>> v2: > >>> - document clock-output-names in bindings documentation > >>> - don't use wildcards in compatibility string > >>> - change Kconfig entry to "... 570 and compatible devices" > >>> - change some indentation flaws > >>> - use 10000 as MIN and MAX value in usleep_range > >>> - fail probe() if 'factory-fout' is not provided in DT > >>> - default factory fout #defines removed > >>> - use i2c driver_data instead of OF data > >>> - remove some related structs and data > >>> - rename DT property 'initial-fout' => 'clock-frequency' (like si5351 > >>> driver) > >>> - add some more details regarding the 'factory-fout' DT property > >>> --- > >>> .../devicetree/bindings/clock/silabs,si570.txt | 39 ++ > >>> drivers/clk/Kconfig | 10 + > >>> drivers/clk/Makefile | 1 + > >>> drivers/clk/clk-si570.c | 531 +++++++++++++++++++++ > >>> 4 files changed, 581 insertions(+) > >>> create mode 100644 Documentation/devicetree/bindings/clock/silabs,si570.txt > >>> create mode 100644 drivers/clk/clk-si570.c > >>> > >>> diff --git a/Documentation/devicetree/bindings/clock/silabs,si570.txt b/Documentation/devicetree/bindings/clock/silabs,si570.txt > >>> new file mode 100644 > >>> index 0000000..c09f21e > >>> --- /dev/null > >>> +++ b/Documentation/devicetree/bindings/clock/silabs,si570.txt > >>> @@ -0,0 +1,39 @@ > >>> +Binding for Silicon Labs 570, 571, 598 and 599 programmable > >>> +I2C clock generators. > >>> + > >>> +Reference > >>> +This binding uses the common clock binding[1]. Details about the devices can be > >>> +found in the data sheets[2][3]. > >>> + > >>> +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt > >>> +[2] Si570/571 Data Sheet > >>> + http://www.silabs.com/Support%20Documents/TechnicalDocs/si570.pdf > >>> +[3] Si598/599 Data Sheet > >>> + http://www.silabs.com/Support%20Documents/TechnicalDocs/si598-99.pdf > >>> + > >>> +Required properties: > >>> + - compatible: Shall be one of "silabs,si570", "silabs,si571", > >>> + "silabs,si598", "silabs,si599" > >>> + - reg: I2C device address. > >>> + - #clock-cells: From common clock bindings: Shall be 0. > >>> + - factory-fout: Factory set default frequency. This frequency is part specific. > >>> + The correct frequency for the part used has to be provided in > >>> + order to generate the correct output frequencies. For more > >>> + details, please refer to the data sheet. > >>> + - temperature-stability: Temperature stability of the device in PPM. Should be > >>> + one of: 7, 20, 50 or 100. > >>> + > >>> +Optional properties: > >>> + - clock-output-names: From common clock bindings. Recommended to be "si570". > >>> + - clock-frequency: Output frequency to generate. This defines the output > >>> + frequency set during boot. It can be reprogrammed during > >>> + runtime through the common clock framework. > >>> + > >>> +Example: > >>> + si570: clock-generator@5d { > >>> + #clock-cells = <0>; > >>> + compatible = "silabs,si570"; > >>> + temperature-stability = <50>; > >>> + reg = <0x5d>; > >>> + factory-fout = <156250000>; > >>> + }; > >>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > >>> index 279407a..349b88a 100644 > >>> --- a/drivers/clk/Kconfig > >>> +++ b/drivers/clk/Kconfig > >>> @@ -64,6 +64,16 @@ config COMMON_CLK_SI5351 > >>> This driver supports Silicon Labs 5351A/B/C programmable clock > >>> generators. > >>> > >>> +config COMMON_CLK_SI570 > >>> + tristate "Clock driver for SiLabs 570 and compatible devices" > >>> + depends on I2C > >>> + depends on OF > >>> + select REGMAP_I2C > >>> + help > >>> + ---help--- > >>> + This driver supports Silicon Labs 570/571/598/599 programmable > >>> + clock generators. > >>> + > >>> config COMMON_CLK_S2MPS11 > >>> tristate "Clock driver for S2MPS11 MFD" > >>> depends on MFD_SEC_CORE > >>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > >>> index 7b11106..c0e94b3 100644 > >>> --- a/drivers/clk/Makefile > >>> +++ b/drivers/clk/Makefile > >>> @@ -40,6 +40,7 @@ obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o > >>> obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o > >>> obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o > >>> obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o > >>> +obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o > >>> obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o > >>> obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o > >>> obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o > >>> diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c > >>> new file mode 100644 > >>> index 0000000..5d0ac9f > >>> --- /dev/null > >>> +++ b/drivers/clk/clk-si570.c > >>> @@ -0,0 +1,531 @@ > >>> +/* > >>> + * Driver for Silicon Labs Si570/Si571 Programmable XO/VCXO > >>> + * > >>> + * Copyright (C) 2010, 2011 Ericsson AB. > >>> + * Copyright (C) 2011 Guenter Roeck. > >>> + * Copyright (C) 2011 - 2013 Xilinx Inc. > >>> + * > >>> + * Author: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx> > >>> + * Sören Brinkmann <soren.brinkmann@xxxxxxxxxx> > >>> + * > >>> + * 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. > >>> + */ > >>> + > >>> +#include <linux/clk-provider.h> > >>> +#include <linux/delay.h> > >>> +#include <linux/module.h> > >>> +#include <linux/i2c.h> > >>> +#include <linux/regmap.h> > >>> +#include <linux/slab.h> > >>> + > >>> +/* Si570 registers */ > >>> +#define SI570_REG_HS_N1 7 > >>> +#define SI570_REG_N1_RFREQ0 8 > >>> +#define SI570_REG_RFREQ1 9 > >>> +#define SI570_REG_RFREQ2 10 > >>> +#define SI570_REG_RFREQ3 11 > >>> +#define SI570_REG_RFREQ4 12 > >>> +#define SI570_REG_CONTROL 135 > >>> +#define SI570_REG_FREEZE_DCO 137 > >>> +#define SI570_DIV_OFFSET_7PPM 6 > >>> + > >>> +#define HS_DIV_SHIFT 5 > >>> +#define HS_DIV_MASK 0xe0 > >>> +#define HS_DIV_OFFSET 4 > >>> +#define N1_6_2_MASK 0x1f > >>> +#define N1_1_0_MASK 0xc0 > >>> +#define RFREQ_37_32_MASK 0x3f > >>> + > >>> +#define SI570_MIN_FREQ 10000000L > >>> +#define SI570_MAX_FREQ 1417500000L > >>> +#define SI598_MAX_FREQ 525000000L > >>> + > >>> +#define FDCO_MIN 4850000000LL > >>> +#define FDCO_MAX 5670000000LL > >>> + > >>> +#define SI570_CNTRL_RECALL (1 << 0) > >>> +#define SI570_CNTRL_FREEZE_M (1 << 5) > >>> +#define SI570_CNTRL_NEWFREQ (1 << 6) > >>> + > >>> +#define SI570_FREEZE_DCO (1 << 4) > >>> + > >>> +/** > >>> + * struct clk_si570: > >>> + * @hw: Clock hw struct > >>> + * @regmap: Device's regmap > >>> + * @div_offset: Rgister offset for dividers > >>> + * @max_freq: Maximum frequency for this device > >>> + * @fxtal: Factory xtal frequency > >>> + * @n1: Clock divider N1 > >>> + * @hs_div: Clock divider HSDIV > >>> + * @rfreq: Clock multiplier RFREQ > >>> + * @frequency: Current output frequency > >>> + * @i2c_client: I2C client pointer > >>> + */ > >>> +struct clk_si570 { > >>> + struct clk_hw hw; > >>> + struct regmap *regmap; > >>> + unsigned int div_offset; > >>> + u64 max_freq; > >>> + u64 fxtal; > >>> + unsigned int n1; > >>> + unsigned int hs_div; > >>> + u64 rfreq; > >>> + u64 frequency; > >>> + struct i2c_client *i2c_client; > >>> +}; > >>> +#define to_clk_si570(_hw) container_of(_hw, struct clk_si570, hw) > >>> + > >>> +enum clk_si570_variant { > >>> + si57x, > >>> + si59x > >>> +}; > >>> + > >>> +/** > >>> + * si570_get_divs() - Read clock dividers from HW > >>> + * @data: Pointer to struct clk_si570 > >>> + * @rfreq: Fractional multiplier (output) > >>> + * @n1: Divider N1 (output) > >>> + * @hs_div: Divider HSDIV (output) > >>> + * Returns 0 on success, negative errno otherwise. > >>> + * > >>> + * Retrieve clock dividers and multipliers from the HW. > >>> + */ > >>> +static int si570_get_divs(struct clk_si570 *data, u64 *rfreq, > >>> + unsigned int *n1, unsigned int *hs_div) > >>> +{ > >>> + int err; > >>> + u8 reg[6]; > >>> + u64 tmp; > >>> + > >>> + err = regmap_bulk_read(data->regmap, SI570_REG_HS_N1 + data->div_offset, > >>> + reg, ARRAY_SIZE(reg)); > >>> + if (err) > >>> + return err; > >>> + > >>> + *hs_div = ((reg[0] & HS_DIV_MASK) >> HS_DIV_SHIFT) + HS_DIV_OFFSET; > >>> + *n1 = ((reg[0] & N1_6_2_MASK) << 2) + ((reg[1] & N1_1_0_MASK) >> 6) + 1; > >>> + /* Handle invalid cases */ > >>> + if (*n1 > 1) > >>> + *n1 &= ~1; > >>> + > >>> + tmp = reg[1] & RFREQ_37_32_MASK; > >>> + tmp = (tmp << 8) + reg[2]; > >>> + tmp = (tmp << 8) + reg[3]; > >>> + tmp = (tmp << 8) + reg[4]; > >>> + tmp = (tmp << 8) + reg[5]; > >>> + *rfreq = tmp; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +/** > >>> + * si570_get_defaults() - Get default values > >>> + * @data: Driver data structure > >>> + * @fout: Factory frequency output > >>> + * Returns 0 on success, negative errno otherwise. > >>> + */ > >>> +static int si570_get_defaults(struct clk_si570 *data, u64 fout) > >>> +{ > >>> + int err; > >>> + u64 fdco; > >>> + > >>> + regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_RECALL); > >>> + > >>> + err = si570_get_divs(data, &data->rfreq, &data->n1, &data->hs_div); > >>> + if (err) > >>> + return err; > >>> + > >>> + /* > >>> + * Accept optional precision loss to avoid arithmetic overflows. > >>> + * Acceptable per Silicon Labs Application Note AN334. > >>> + */ > >>> + fdco = fout * data->n1 * data->hs_div; > >>> + if (fdco >= (1LL << 36)) > >>> + data->fxtal = div64_u64(fdco << 24, data->rfreq >> 4); > >>> + else > >>> + data->fxtal = div64_u64(fdco << 28, data->rfreq); > >>> + > >>> + data->frequency = fout; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +/** > >>> + * si570_update_rfreq() - Update clock multiplier > >>> + * @data: Driver data structure > >>> + * Passes on regmap_bulk_write() return value. > >>> + */ > >>> +static int si570_update_rfreq(struct clk_si570 *data) > >>> +{ > >>> + u8 reg[5]; > >>> + > >>> + reg[0] = ((data->n1 - 1) << 6) | > >>> + ((data->rfreq >> 32) & RFREQ_37_32_MASK); > >>> + reg[1] = (data->rfreq >> 24) & 0xff; > >>> + reg[2] = (data->rfreq >> 16) & 0xff; > >>> + reg[3] = (data->rfreq >> 8) & 0xff; > >>> + reg[4] = data->rfreq & 0xff; > >>> + > >>> + return regmap_bulk_write(data->regmap, SI570_REG_N1_RFREQ0 + > >>> + data->div_offset, reg, ARRAY_SIZE(reg)); > >>> +} > >>> + > >>> +/** > >>> + * si570_calc_divs() - Caluclate clock dividers > >>> + * @frequency: Target frequency > >>> + * @data: Driver data structure > >>> + * @out_rfreq: RFREG fractional multiplier (output) > >>> + * @out_n1: Clock divider N1 (output) > >>> + * @out_hs_div: Clock divider HSDIV (output) > >>> + * Returns 0 on success, negative errno otherwise. > >>> + * > >>> + * Calculate the clock dividers (@out_hs_div, @out_n1) and clock multiplier > >>> + * (@out_rfreq) for a given target @frequency. > >>> + */ > >>> +static int si570_calc_divs(unsigned long frequency, struct clk_si570 *data, > >>> + u64 *out_rfreq, unsigned int *out_n1, unsigned int *out_hs_div) > >>> +{ > >>> + int i; > >>> + unsigned int n1, hs_div; > >>> + u64 fdco, best_fdco = ULLONG_MAX; > >>> + static const uint8_t si570_hs_div_values[] = { 11, 9, 7, 6, 5, 4 }; > >>> + > >>> + for (i = 0; i < ARRAY_SIZE(si570_hs_div_values); i++) { > >>> + hs_div = si570_hs_div_values[i]; > >>> + /* Calculate lowest possible value for n1 */ > >>> + n1 = div_u64(div_u64(FDCO_MIN, hs_div), frequency); > >>> + if (!n1 || (n1 & 1)) > >>> + n1++; > >>> + while (n1 <= 128) { > >>> + fdco = (u64)frequency * (u64)hs_div * (u64)n1; > >>> + if (fdco > FDCO_MAX) > >>> + break; > >>> + if (fdco >= FDCO_MIN && fdco < best_fdco) { > >>> + *out_n1 = n1; > >>> + *out_hs_div = hs_div; > >>> + *out_rfreq = div64_u64(fdco << 28, data->fxtal); > >>> + best_fdco = fdco; > >>> + } > >>> + n1 += (n1 == 1 ? 1 : 2); > >>> + } > >>> + } > >>> + > >>> + if (best_fdco == ULLONG_MAX) > >>> + return -EINVAL; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static unsigned long si570_recalc_rate(struct clk_hw *hw, > >>> + unsigned long parent_rate) > >>> +{ > >>> + int err; > >>> + u64 rfreq, rate; > >>> + unsigned int n1, hs_div; > >>> + struct clk_si570 *data = to_clk_si570(hw); > >>> + > >>> + err = si570_get_divs(data, &rfreq, &n1, &hs_div); > >>> + if (err) { > >>> + dev_err(&data->i2c_client->dev, "unable to recalc rate\n"); > >>> + return data->frequency; > >>> + } > >>> + > >>> + rfreq = div_u64(rfreq, hs_div * n1); > >>> + rate = (data->fxtal * rfreq) >> 28; > >>> + > >>> + return rate; > >>> +} > >>> + > >>> +static long si570_round_rate(struct clk_hw *hw, unsigned long rate, > >>> + unsigned long *parent_rate) > >>> +{ > >>> + int err; > >>> + u64 rfreq; > >>> + unsigned int n1, hs_div; > >>> + struct clk_si570 *data = to_clk_si570(hw); > >>> + > >>> + if (!rate) > >>> + return 0; > >>> + > >>> + if (div64_u64(abs(rate - data->frequency) * 10000LL, > >>> + data->frequency) < 35) { > >>> + rfreq = div64_u64((data->rfreq * rate) + > >>> + div64_u64(data->frequency, 2), data->frequency); > >>> + n1 = data->n1; > >>> + hs_div = data->hs_div; > >>> + > >>> + } else { > >>> + err = si570_calc_divs(rate, data, &rfreq, &n1, &hs_div); > >>> + if (err) { > >>> + dev_err(&data->i2c_client->dev, > >>> + "unable to round rate\n"); > >>> + return 0; > >>> + } > >>> + } > >>> + > >>> + return rate; > >>> +} > >>> + > >>> +/** > >>> + * si570_set_frequency() - Adjust output frequency > >>> + * @data: Driver data structure > >>> + * @frequency: Target frequency > >>> + * Returns 0 on success. > >>> + * > >>> + * Update output frequency for big frequency changes (> 3,500 ppm). > >>> + */ > >>> +static int si570_set_frequency(struct clk_si570 *data, unsigned long frequency) > >>> +{ > >>> + int err; > >>> + > >>> + err = si570_calc_divs(frequency, data, &data->rfreq, &data->n1, > >>> + &data->hs_div); > >>> + if (err) > >>> + return err; > >>> + > >>> + /* > >>> + * The DCO reg should be accessed with a read-modify-write operation > >>> + * per AN334 > >>> + */ > >>> + regmap_write(data->regmap, SI570_REG_FREEZE_DCO, SI570_FREEZE_DCO); > >>> + regmap_write(data->regmap, SI570_REG_HS_N1 + data->div_offset, > >>> + ((data->hs_div - HS_DIV_OFFSET) << HS_DIV_SHIFT) | > >>> + (((data->n1 - 1) >> 2) & N1_6_2_MASK)); > >>> + si570_update_rfreq(data); > >>> + regmap_write(data->regmap, SI570_REG_FREEZE_DCO, 0); > >>> + regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_NEWFREQ); > >>> + > >>> + /* Applying a new frequency can take up to 10ms */ > >>> + usleep_range(10000, 12000); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +/** > >>> + * si570_set_frequency_small() - Adjust output frequency > >>> + * @data: Driver data structure > >>> + * @frequency: Target frequency > >>> + * Returns 0 on success. > >>> + * > >>> + * Update output frequency for small frequency changes (< 3,500 ppm). > >>> + */ > >>> +static int si570_set_frequency_small(struct clk_si570 *data, > >>> + unsigned long frequency) > >>> +{ > >>> + /* > >>> + * This is a re-implementation of DIV_ROUND_CLOSEST > >>> + * using the div64_u64 function lieu of letting the compiler > >>> + * insert EABI calls > >>> + */ > >>> + data->rfreq = div64_u64((data->rfreq * frequency) + > >>> + div_u64(data->frequency, 2), data->frequency); > >>> + regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_FREEZE_M); > >>> + si570_update_rfreq(data); > >>> + regmap_write(data->regmap, SI570_REG_CONTROL, 0); > >>> + > >>> + /* Applying a new frequency (small change) can take up to 100us */ > >>> + usleep_range(100, 200); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int si570_set_rate(struct clk_hw *hw, unsigned long rate, > >>> + unsigned long parent_rate) > >>> +{ > >>> + struct clk_si570 *data = to_clk_si570(hw); > >>> + struct i2c_client *client = data->i2c_client; > >>> + int err; > >>> + > >>> + if (rate < SI570_MIN_FREQ || rate > data->max_freq) { > >>> + dev_err(&client->dev, > >>> + "requested frequency %lu Hz is out of range\n", rate); > >>> + return -EINVAL; > >>> + } > >>> + > >>> + if (div64_u64(abs(rate - data->frequency) * 10000LL, > >>> + data->frequency) < 35) > >>> + err = si570_set_frequency_small(data, rate); > >>> + else > >>> + err = si570_set_frequency(data, rate); > >>> + > >>> + if (err) > >>> + return err; > >>> + > >>> + data->frequency = rate; > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static const struct clk_ops si570_clk_ops = { > >>> + .recalc_rate = si570_recalc_rate, > >>> + .round_rate = si570_round_rate, > >>> + .set_rate = si570_set_rate, > >>> +}; > >>> + > >>> +static bool si570_regmap_is_volatile(struct device *dev, unsigned int reg) > >>> +{ > >>> + switch (reg) { > >>> + case SI570_REG_CONTROL: > >>> + return true; > >>> + default: > >>> + return false; > >>> + } > >>> +} > >>> + > >>> +static bool si570_regmap_is_writeable(struct device *dev, unsigned int reg) > >>> +{ > >>> + switch (reg) { > >>> + case SI570_REG_HS_N1 ... (SI570_REG_RFREQ4 + SI570_DIV_OFFSET_7PPM): > >>> + case SI570_REG_CONTROL: > >>> + case SI570_REG_FREEZE_DCO: > >>> + return true; > >>> + default: > >>> + return false; > >>> + } > >>> +} > >>> + > >>> +static struct regmap_config si570_regmap_config = { > >>> + .reg_bits = 8, > >>> + .val_bits = 8, > >>> + .cache_type = REGCACHE_RBTREE, > >>> + .max_register = 137, > >>> + .writeable_reg = si570_regmap_is_writeable, > >>> + .volatile_reg = si570_regmap_is_volatile, > >>> +}; > >>> + > >>> +static int si570_probe(struct i2c_client *client, > >>> + const struct i2c_device_id *id) > >>> +{ > >>> + struct clk_si570 *data; > >>> + struct clk_init_data init; > >>> + struct clk *clk; > >>> + u32 initial_fout, factory_fout, stability; > >>> + int err; > >>> + enum clk_si570_variant variant = id->driver_data; > >>> + > >>> + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); > >>> + if (!data) > >>> + return -ENOMEM; > >>> + > >>> + init.ops = &si570_clk_ops; > >>> + init.flags = CLK_IS_ROOT; > >>> + init.num_parents = 0; > >>> + data->hw.init = &init; > >>> + data->i2c_client = client; > >>> + > >>> + if (variant == si57x) { > >>> + err = of_property_read_u32(client->dev.of_node, > >>> + "temperature-stability", &stability); > >>> + if (err) { > >>> + dev_err(&client->dev, > >>> + "'temperature-stability' property missing\n"); > >>> + return err; > >>> + } > >>> + /* adjust register offsets for 7ppm devices */ > >>> + if (stability == 7) > >>> + data->div_offset = SI570_DIV_OFFSET_7PPM; > >>> + > >>> + data->max_freq = SI570_MAX_FREQ; > >>> + } else { > >>> + data->max_freq = SI598_MAX_FREQ; > >>> + } > >>> + > >>> + if (of_property_read_string(client->dev.of_node, "clock-output-names", > >>> + &init.name)) > >>> + init.name = client->dev.of_node->name; > >>> + > >>> + err = of_property_read_u32(client->dev.of_node, "factory-fout", > >>> + &factory_fout); > >>> + if (err) { > >>> + dev_err(&client->dev, "'factory-fout' property missing\n"); > >>> + return err; > >>> + } > >>> + > >>> + data->regmap = devm_regmap_init_i2c(client, &si570_regmap_config); > >>> + if (IS_ERR(data->regmap)) { > >>> + dev_err(&client->dev, "failed to allocate register map\n"); > >>> + return PTR_ERR(data->regmap); > >>> + } > >>> + > >>> + i2c_set_clientdata(client, data); > >>> + err = si570_get_defaults(data, factory_fout); > >>> + if (err) > >>> + return err; > >>> + > >>> + clk = devm_clk_register(&client->dev, &data->hw); > >>> + if (IS_ERR(clk)) { > >>> + dev_err(&client->dev, "clock registration failed\n"); > >>> + return PTR_ERR(clk); > >>> + } > >>> + err = of_clk_add_provider(client->dev.of_node, of_clk_src_simple_get, > >>> + clk); > >>> + if (err) { > >>> + dev_err(&client->dev, "unable to add clk provider\n"); > >>> + return err; > >>> + } > >>> + > >>> + /* Read the requested initial output frequency from device tree */ > >>> + if (!of_property_read_u32(client->dev.of_node, "clock-frequency", > >>> + &initial_fout)) { > >>> + err = clk_set_rate(clk, initial_fout); > >>> + if (err) { > >>> + of_clk_del_provider(client->dev.of_node); > >>> + return err; > >>> + } > >>> + } > >>> + > >>> + /* Display a message indicating that we've successfully registered */ > >>> + dev_info(&client->dev, "registered, current frequency %llu Hz\n", > >>> + data->frequency); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static int si570_remove(struct i2c_client *client) > >>> +{ > >>> + of_clk_del_provider(client->dev.of_node); > >>> + return 0; > >>> +} > >>> + > >>> +static const struct i2c_device_id si570_id[] = { > >>> + { "si570", si57x }, > >>> + { "si571", si57x }, > >>> + { "si598", si59x }, > >>> + { "si599", si59x }, > >>> + { } > >>> +}; > >>> +MODULE_DEVICE_TABLE(i2c, si570_id); > >>> + > >>> +static const struct of_device_id clk_si570_of_match[] = { > >>> + { .compatible = "silabs,si570" }, > >>> + { .compatible = "silabs,si571" }, > >>> + { .compatible = "silabs,si598" }, > >>> + { .compatible = "silabs,si599" }, > >>> + { }, > >>> +}; > >>> +MODULE_DEVICE_TABLE(of, clk_si570_of_match); > >>> + > >>> +static struct i2c_driver si570_driver = { > >>> + .driver = { > >>> + .name = "si570", > >>> + .of_match_table = of_match_ptr(clk_si570_of_match), > >>> + }, > >>> + .probe = si570_probe, > >>> + .remove = si570_remove, > >>> + .id_table = si570_id, > >>> +}; > >>> +module_i2c_driver(si570_driver); > >>> + > >>> +MODULE_AUTHOR("Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>"); > >>> +MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xxxxxxxxxx"); > >>> +MODULE_DESCRIPTION("Si570 driver"); > >>> +MODULE_LICENSE("GPL"); > >>> -- > >>> 1.8.4 > >>> > >>> > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > > > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
