[U-Boot] [PATCH v9 2/9] clk: sifive: Sync-up WRPLL library with upstream Linux
Rick Chen
rickchen36 at gmail.com
Fri Jul 19 05:41:38 UTC 2019
> > From: Anup Patel [mailto:Anup.Patel at wdc.com]
> > Sent: Tuesday, June 25, 2019 2:31 PM
> > To: Rick Jian-Zhi Chen(陳建志); Bin Meng; Lukas Auer; Simon Glass
> > Cc: Ramon Fried; Joe Hershberger; Palmer Dabbelt; Paul Walmsley; Troy
> > Benjegerdes; Atish Patra; Alistair Francis; U-Boot Mailing List; Anup Patel
> > Subject: [PATCH v9 2/9] clk: sifive: Sync-up WRPLL library with upstream Linux
> >
> > Now that SiFive clock driver is merged in upstream Linux, we sync-up WRPLL
> > library used by SiFive clock driver with upstream Linux sources.
> >
> > Signed-off-by: Anup Patel <anup.patel at wdc.com>
> > Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> > ---
> > drivers/clk/analogbits/wrpll-cln28hpc.c | 165 ++++++++----------
> > drivers/clk/sifive/fu540-prci.c | 26 +--
> > include/linux/clk/analogbits-wrpll-cln28hpc.h | 70 +++-----
> > 3 files changed, 107 insertions(+), 154 deletions(-)
> >
> > diff --git a/drivers/clk/analogbits/wrpll-cln28hpc.c
> > b/drivers/clk/analogbits/wrpll-cln28hpc.c
> > index 68eb1148b9..776ead319a 100644
> > --- a/drivers/clk/analogbits/wrpll-cln28hpc.c
> > +++ b/drivers/clk/analogbits/wrpll-cln28hpc.c
> > @@ -1,20 +1,9 @@
> > // SPDX-License-Identifier: GPL-2.0
> > /*
> > - * Copyright (c) 2019 Western Digital Corporation or its affiliates.
> > - *
> > - * Copyright (C) 2018 SiFive, Inc.
> > + * Copyright (C) 2018-2019 SiFive, Inc.
> > * Wesley Terpstra
> > * Paul Walmsley
> > *
> > - * This program is free software; you can redistribute it and/or modify
> > - * it under the terms of the GNU General Public License version 2 as
> > - * published by the Free Software Foundation.
> > - *
> > - * 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.
> > - *
> > * This library supports configuration parsing and reprogramming of
> > * the CLN28HPC variant of the Analog Bits Wide Range PLL. The
> > * intention is for this library to be reusable for any device that @@ -29,6
> > +18,7 @@
> > * References:
> > * - Analog Bits "Wide Range PLL Datasheet", version 2015.10.01
> > * - SiFive FU540-C000 Manual v1p0, Chapter 7 "Clocking and Reset"
> > + * https://static.dev.sifive.com/FU540-C000-v1.0.pdf
> > */
> >
> > #include <linux/bug.h>
> > @@ -84,40 +74,38 @@
> > * range selection.
> > *
> > * Return: The RANGE value to be presented to the PLL configuration inputs,
> > - * or -1 upon error.
> > + * or a negative return code upon error.
> > */
> > static int __wrpll_calc_filter_range(unsigned long post_divr_freq) {
> > - u8 range;
> > -
> > if (post_divr_freq < MIN_POST_DIVR_FREQ ||
> > post_divr_freq > MAX_POST_DIVR_FREQ) {
> > WARN(1, "%s: post-divider reference freq out of range: %lu",
> > __func__, post_divr_freq);
> > - return -1;
> > + return -ERANGE;
> > }
> >
> > - if (post_divr_freq < 11000000)
> > - range = 1;
> > - else if (post_divr_freq < 18000000)
> > - range = 2;
> > - else if (post_divr_freq < 30000000)
> > - range = 3;
> > - else if (post_divr_freq < 50000000)
> > - range = 4;
> > - else if (post_divr_freq < 80000000)
> > - range = 5;
> > - else if (post_divr_freq < 130000000)
> > - range = 6;
> > - else
> > - range = 7;
> > -
> > - return range;
> > + switch (post_divr_freq) {
> > + case 0 ... 10999999:
> > + return 1;
> > + case 11000000 ... 17999999:
> > + return 2;
> > + case 18000000 ... 29999999:
> > + return 3;
> > + case 30000000 ... 49999999:
> > + return 4;
> > + case 50000000 ... 79999999:
> > + return 5;
> > + case 80000000 ... 129999999:
> > + return 6;
> > + }
> > +
> > + return 7;
> > }
> >
> > /**
> > * __wrpll_calc_fbdiv() - return feedback fixed divide value
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to read from
> > + * @c: ptr to a struct wrpll_cfg record to read from
> > *
> > * The internal feedback path includes a fixed by-two divider; the
> > * external feedback path does not. Return the appropriate divider @@
> > -132,7 +120,7 @@ static int __wrpll_calc_filter_range(unsigned long
> > post_divr_freq)
> > * Return: 2 if internal feedback is enabled or 1 if external feedback
> > * is enabled.
> > */
> > -static u8 __wrpll_calc_fbdiv(struct analogbits_wrpll_cfg *c)
> > +static u8 __wrpll_calc_fbdiv(const struct wrpll_cfg *c)
> > {
> > return (c->flags & WRPLL_FLAGS_INT_FEEDBACK_MASK) ? 2 : 1; } @@
> > -172,7 +160,7 @@ static u8 __wrpll_calc_divq(u32 target_rate, u64
> > *vco_rate)
> > *vco_rate = MIN_VCO_FREQ;
> > } else {
> > divq = ilog2(s);
> > - *vco_rate = target_rate << divq;
> > + *vco_rate = (u64)target_rate << divq;
> > }
> >
> > wcd_out:
> > @@ -181,7 +169,7 @@ wcd_out:
> >
> > /**
> > * __wrpll_update_parent_rate() - update PLL data when parent rate changes
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to write PLL data to
> > + * @c: ptr to a struct wrpll_cfg record to write PLL data to
> > * @parent_rate: PLL input refclk rate (pre-R-divider)
> > *
> > * Pre-compute some data used by the PLL configuration algorithm when @@
> > -189,46 +177,40 @@ wcd_out:
> > * computation when the parent rate remains constant - expected to be
> > * the common case.
> > *
> > - * Returns: 0 upon success or -1 if the reference clock rate is out of range.
> > + * Returns: 0 upon success or -ERANGE if the reference clock rate is
> > + * out of range.
> > */
> > -static int __wrpll_update_parent_rate(struct analogbits_wrpll_cfg *c,
> > +static int __wrpll_update_parent_rate(struct wrpll_cfg *c,
> > unsigned long parent_rate)
> > {
> > u8 max_r_for_parent;
> >
> > if (parent_rate > MAX_INPUT_FREQ || parent_rate <
> > MIN_POST_DIVR_FREQ)
> > - return -1;
> > + return -ERANGE;
> >
> > - c->_parent_rate = parent_rate;
> > + c->parent_rate = parent_rate;
> > max_r_for_parent = div_u64(parent_rate, MIN_POST_DIVR_FREQ);
> > - c->_max_r = min_t(u8, MAX_DIVR_DIVISOR, max_r_for_parent);
> > + c->max_r = min_t(u8, MAX_DIVR_DIVISOR, max_r_for_parent);
> >
> > - /* Round up */
> > - c->_init_r = div_u64(parent_rate + MAX_POST_DIVR_FREQ - 1,
> > - MAX_POST_DIVR_FREQ);
> > + c->init_r = DIV_ROUND_UP_ULL(parent_rate, MAX_POST_DIVR_FREQ);
> >
> > return 0;
> > }
> >
> > -/*
> > - * Public functions
> > - */
> > -
> > /**
> > - * analogbits_wrpll_configure() - compute PLL configuration for a target rate
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to write into
> > + * wrpll_configure() - compute PLL configuration for a target rate
> > + * @c: ptr to a struct wrpll_cfg record to write into
> > * @target_rate: target PLL output clock rate (post-Q-divider)
> > * @parent_rate: PLL input refclk rate (pre-R-divider)
> > *
> > - * Given a pointer to a PLL context @c, a desired PLL target output
> > - * rate @target_rate, and a reference clock input rate @parent_rate,
> > - * compute the appropriate PLL signal configuration values. PLL
> > - * reprogramming is not glitchless, so the caller should switch any
> > - * downstream logic to a different clock source or clock-gate it
> > - * before presenting these values to the PLL configuration signals.
> > + * Compute the appropriate PLL signal configuration values and store
> > + * in PLL context @c. PLL reprogramming is not glitchless, so the
> > + * caller should switch any downstream logic to a different clock
> > + * source or clock-gate it before presenting these values to the PLL
> > + * configuration signals.
> > *
> > * The caller must pass this function a pre-initialized struct
> > - * analogbits_wrpll_cfg record: either initialized to zero (with the
> > + * wrpll_cfg record: either initialized to zero (with the
> > * exception of the .name and .flags fields) or read from the PLL.
> > *
> > * Context: Any context. Caller must protect the memory pointed to by @c
> > @@ -236,41 +218,26 @@ static int __wrpll_update_parent_rate(struct
> > analogbits_wrpll_cfg *c,
> > *
> > * Return: 0 upon success; anything else upon failure.
> > */
> > -int analogbits_wrpll_configure_for_rate(struct analogbits_wrpll_cfg *c,
> > - u32 target_rate,
> > - unsigned long parent_rate)
> > +int wrpll_configure_for_rate(struct wrpll_cfg *c, u32 target_rate,
> > + unsigned long parent_rate)
> > {
> > unsigned long ratio;
> > u64 target_vco_rate, delta, best_delta, f_pre_div, vco, vco_pre;
> > - u32 best_f, f, post_divr_freq, fbcfg;
> > + u32 best_f, f, post_divr_freq;
> > u8 fbdiv, divq, best_r, r;
> > -
> > - if (!c)
> > - return -1;
> > + int range;
> >
> > if (c->flags == 0) {
> > WARN(1, "%s called with uninitialized PLL config", __func__);
> > - return -1;
> > - }
> > -
> > - fbcfg = WRPLL_FLAGS_INT_FEEDBACK_MASK |
> > WRPLL_FLAGS_EXT_FEEDBACK_MASK;
> > - if ((c->flags & fbcfg) == fbcfg) {
> > - WARN(1, "%s called with invalid PLL config", __func__);
> > - return -1;
> > - }
> > -
> > - if (c->flags == WRPLL_FLAGS_EXT_FEEDBACK_MASK) {
> > - WARN(1, "%s: external feedback mode not currently supported",
> > - __func__);
> > - return -1;
> > + return -EINVAL;
> > }
> >
> > /* Initialize rounding data if it hasn't been initialized already */
> > - if (parent_rate != c->_parent_rate) {
> > + if (parent_rate != c->parent_rate) {
> > if (__wrpll_update_parent_rate(c, parent_rate)) {
> > pr_err("%s: PLL input rate is out of range\n",
> > __func__);
> > - return -1;
> > + return -ERANGE;
> > }
> > }
> >
> > @@ -281,11 +248,12 @@ int analogbits_wrpll_configure_for_rate(struct
> > analogbits_wrpll_cfg *c,
> > c->flags |= WRPLL_FLAGS_BYPASS_MASK;
> > return 0;
> > }
> > +
> > c->flags &= ~WRPLL_FLAGS_BYPASS_MASK;
> >
> > /* Calculate the Q shift and target VCO rate */
> > divq = __wrpll_calc_divq(target_rate, &target_vco_rate);
> > - if (divq == 0)
> > + if (!divq)
> > return -1;
> > c->divq = divq;
> >
> > @@ -301,8 +269,7 @@ int analogbits_wrpll_configure_for_rate(struct
> > analogbits_wrpll_cfg *c,
> > * Consider all values for R which land within
> > * [MIN_POST_DIVR_FREQ, MAX_POST_DIVR_FREQ]; prefer smaller R
> > */
> > - for (r = c->_init_r; r <= c->_max_r; ++r) {
> > - /* What is the best F we can pick in this case? */
> > + for (r = c->init_r; r <= c->max_r; ++r) {
> > f_pre_div = ratio * r;
> > f = (f_pre_div + (1 << ROUND_SHIFT)) >> ROUND_SHIFT;
> > f >>= (fbdiv - 1);
> > @@ -334,46 +301,54 @@ int analogbits_wrpll_configure_for_rate(struct
> > analogbits_wrpll_cfg *c,
> > post_divr_freq = div_u64(parent_rate, best_r);
> >
> > /* Pick the best PLL jitter filter */
> > - c->range = __wrpll_calc_filter_range(post_divr_freq);
> > + range = __wrpll_calc_filter_range(post_divr_freq);
> > + if (range < 0)
> > + return range;
> > + c->range = range;
> >
> > return 0;
> > }
> >
> > /**
> > - * analogbits_wrpll_calc_output_rate() - calculate the PLL's target output rate
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to read from
> > + * wrpll_calc_output_rate() - calculate the PLL's target output rate
> > + * @c: ptr to a struct wrpll_cfg record to read from
> > * @parent_rate: PLL refclk rate
> > *
> > * Given a pointer to the PLL's current input configuration @c and the
> > * PLL's input reference clock rate @parent_rate (before the R
> > * pre-divider), calculate the PLL's output clock rate (after the Q
> > - * post-divider)
> > + * post-divider).
> > *
> > * Context: Any context. Caller must protect the memory pointed to by @c
> > * from simultaneous modification.
> > *
> > - * Return: the PLL's output clock rate, in Hz.
> > + * Return: the PLL's output clock rate, in Hz. The return value from
> > + * this function is intended to be convenient to pass directly
> > + * to the Linux clock framework; thus there is no explicit
> > + * error return value.
> > */
> > -unsigned long analogbits_wrpll_calc_output_rate(struct analogbits_wrpll_cfg
> > *c,
> > - unsigned long parent_rate)
> > +unsigned long wrpll_calc_output_rate(const struct wrpll_cfg *c,
> > + unsigned long parent_rate)
> > {
> > u8 fbdiv;
> > u64 n;
> >
> > - WARN(c->flags & WRPLL_FLAGS_EXT_FEEDBACK_MASK,
> > - "external feedback mode not yet supported");
> > + if (c->flags & WRPLL_FLAGS_EXT_FEEDBACK_MASK) {
> > + WARN(1, "external feedback mode not yet supported");
> > + return ULONG_MAX;
> > + }
> >
> > fbdiv = __wrpll_calc_fbdiv(c);
> > n = parent_rate * fbdiv * (c->divf + 1);
> > - n = div_u64(n, (c->divr + 1));
> > + n = div_u64(n, c->divr + 1);
> > n >>= c->divq;
> >
> > return n;
> > }
> >
> > /**
> > - * analogbits_wrpll_calc_max_lock_us() - return the time for the PLL to lock
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to read from
> > + * wrpll_calc_max_lock_us() - return the time for the PLL to lock
> > + * @c: ptr to a struct wrpll_cfg record to read from
> > *
> > * Return the minimum amount of time (in microseconds) that the caller
> > * must wait after reprogramming the PLL to ensure that it is locked @@
> > -383,7 +358,7 @@ unsigned long analogbits_wrpll_calc_output_rate(struct
> > analogbits_wrpll_cfg *c,
> > * Return: the minimum amount of time the caller must wait for the PLL
> > * to lock (in microseconds)
> > */
> > -unsigned int analogbits_wrpll_calc_max_lock_us(struct analogbits_wrpll_cfg
> > *c)
> > +unsigned int wrpll_calc_max_lock_us(const struct wrpll_cfg *c)
> > {
> > return MAX_LOCK_US;
> > }
> > diff --git a/drivers/clk/sifive/fu540-prci.c b/drivers/clk/sifive/fu540-prci.c index
> > 56084db2e6..cdbf35e871 100644
> > --- a/drivers/clk/sifive/fu540-prci.c
> > +++ b/drivers/clk/sifive/fu540-prci.c
> > @@ -174,7 +174,7 @@ struct __prci_data {
> > * bypass mux is not glitchless.
> > */
> > struct __prci_wrpll_data {
> > - struct analogbits_wrpll_cfg c;
> > + struct wrpll_cfg c;
> > void (*bypass)(struct __prci_data *pd);
> > void (*no_bypass)(struct __prci_data *pd);
> > u8 cfg0_offs;
> > @@ -244,7 +244,7 @@ static void __prci_writel(u32 v, u32 offs, struct
> > __prci_data *pd)
> >
> > /**
> > * __prci_wrpll_unpack() - unpack WRPLL configuration registers into
> > parameters
> > - * @c: ptr to a struct analogbits_wrpll_cfg record to write config into
> > + * @c: ptr to a struct wrpll_cfg record to write config into
> > * @r: value read from the PRCI PLL configuration register
> > *
> > * Given a value @r read from an FU540 PRCI PLL configuration register, @@
> > -256,7 +256,7 @@ static void __prci_writel(u32 v, u32 offs, struct __prci_data
> > *pd)
> > *
> > * Context: Any context.
> > */
> > -static void __prci_wrpll_unpack(struct analogbits_wrpll_cfg *c, u32 r)
> > +static void __prci_wrpll_unpack(struct wrpll_cfg *c, u32 r)
> > {
> > u32 v;
> >
> > @@ -287,7 +287,7 @@ static void __prci_wrpll_unpack(struct
> > analogbits_wrpll_cfg *c, u32 r)
> >
> > /**
> > * __prci_wrpll_pack() - pack PLL configuration parameters into a register
> > value
> > - * @c: pointer to a struct analogbits_wrpll_cfg record containing the PLL's cfg
> > + * @c: pointer to a struct wrpll_cfg record containing the PLL's cfg
> > *
> > * Using a set of WRPLL configuration values pointed to by @c,
> > * assemble a PRCI PLL configuration register value, and return it to @@
> > -300,7 +300,7 @@ static void __prci_wrpll_unpack(struct analogbits_wrpll_cfg
> > *c, u32 r)
> > * Returns: a value suitable for writing into a PRCI PLL configuration
> > * register
> > */
> > -static u32 __prci_wrpll_pack(struct analogbits_wrpll_cfg *c)
> > +static u32 __prci_wrpll_pack(struct wrpll_cfg *c)
> > {
> > u32 r = 0;
> >
> > @@ -348,11 +348,11 @@ static void __prci_wrpll_read_cfg(struct __prci_data
> > *pd,
> > */
> > static void __prci_wrpll_write_cfg(struct __prci_data *pd,
> > struct __prci_wrpll_data *pwd,
> > - struct analogbits_wrpll_cfg *c)
> > + struct wrpll_cfg *c)
> > {
> > __prci_writel(__prci_wrpll_pack(c), pwd->cfg0_offs, pd);
> >
> > - memcpy(&pwd->c, c, sizeof(struct analogbits_wrpll_cfg));
> > + memcpy(&pwd->c, c, sizeof(struct wrpll_cfg));
> > }
> >
> > /* Core clock mux control */
> > @@ -403,7 +403,7 @@ static unsigned long
> > sifive_fu540_prci_wrpll_recalc_rate(
> > {
> > struct __prci_wrpll_data *pwd = pc->pwd;
> >
> > - return analogbits_wrpll_calc_output_rate(&pwd->c, parent_rate);
> > + return wrpll_calc_output_rate(&pwd->c, parent_rate);
> > }
> >
> > static unsigned long sifive_fu540_prci_wrpll_round_rate(
> > @@ -412,13 +412,13 @@ static unsigned long
> > sifive_fu540_prci_wrpll_round_rate(
> > unsigned long *parent_rate)
> > {
> > struct __prci_wrpll_data *pwd = pc->pwd;
> > - struct analogbits_wrpll_cfg c;
> > + struct wrpll_cfg c;
> >
> > memcpy(&c, &pwd->c, sizeof(c));
> >
> > - analogbits_wrpll_configure_for_rate(&c, rate, *parent_rate);
> > + wrpll_configure_for_rate(&c, rate, *parent_rate);
> >
> > - return analogbits_wrpll_calc_output_rate(&c, *parent_rate);
> > + return wrpll_calc_output_rate(&c, *parent_rate);
> > }
> >
> > static int sifive_fu540_prci_wrpll_set_rate(struct __prci_clock *pc, @@
> > -429,7 +429,7 @@ static int sifive_fu540_prci_wrpll_set_rate(struct
> > __prci_clock *pc,
> > struct __prci_data *pd = pc->pd;
> > int r;
> >
> > - r = analogbits_wrpll_configure_for_rate(&pwd->c, rate, parent_rate);
> > + r = wrpll_configure_for_rate(&pwd->c, rate, parent_rate);
> > if (r)
> > return -ERANGE;
> >
> > @@ -438,7 +438,7 @@ static int sifive_fu540_prci_wrpll_set_rate(struct
> > __prci_clock *pc,
> >
> > __prci_wrpll_write_cfg(pd, pwd, &pwd->c);
> >
> > - udelay(analogbits_wrpll_calc_max_lock_us(&pwd->c));
> > + udelay(wrpll_calc_max_lock_us(&pwd->c));
> >
> > if (pwd->no_bypass)
> > pwd->no_bypass(pd);
> > diff --git a/include/linux/clk/analogbits-wrpll-cln28hpc.h
> > b/include/linux/clk/analogbits-wrpll-cln28hpc.h
> > index 4432e24749..03279097e1 100644
> > --- a/include/linux/clk/analogbits-wrpll-cln28hpc.h
> > +++ b/include/linux/clk/analogbits-wrpll-cln28hpc.h
> > @@ -1,19 +1,8 @@
> > /* SPDX-License-Identifier: GPL-2.0 */
> > /*
> > - * Copyright (c) 2019 Western Digital Corporation or its affiliates.
> > - *
> > - * Copyright (C) 2018 SiFive, Inc.
> > + * Copyright (C) 2018-2019 SiFive, Inc.
> > * Wesley Terpstra
> > * Paul Walmsley
> > - *
> > - * This program is free software; you can redistribute it and/or modify
> > - * it under the terms of the GNU General Public License version 2 as
> > - * published by the Free Software Foundation.
> > - *
> > - * 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.
> > */
> >
> > #ifndef __LINUX_CLK_ANALOGBITS_WRPLL_CLN28HPC_H
> > @@ -25,7 +14,7 @@
> > #define DIVQ_VALUES 6
> >
> > /*
> > - * Bit definitions for struct analogbits_wrpll_cfg.flags
> > + * Bit definitions for struct wrpll_cfg.flags
> > *
> > * WRPLL_FLAGS_BYPASS_FLAG: if set, the PLL is either in bypass, or should be
> > * programmed to enter bypass
> > @@ -34,10 +23,6 @@
> > * feedback mode
> > * WRPLL_FLAGS_EXT_FEEDBACK_FLAG: if set, the PLL is configured for
> > external
> > * feedback mode (not yet supported by this driver)
> > - *
> > - * The flags WRPLL_FLAGS_INT_FEEDBACK_FLAG and
> > WRPLL_FLAGS_EXT_FEEDBACK_FLAG are
> > - * mutually exclusive. If both bits are set, or both are zero, the struct
> > - * analogbits_wrpll_cfg record is uninitialized or corrupt.
> > */
> > #define WRPLL_FLAGS_BYPASS_SHIFT 0
> > #define WRPLL_FLAGS_BYPASS_MASK
> > BIT(WRPLL_FLAGS_BYPASS_SHIFT)
> > @@ -49,53 +34,46 @@
> > #define WRPLL_FLAGS_EXT_FEEDBACK_MASK
> > BIT(WRPLL_FLAGS_EXT_FEEDBACK_SHIFT)
> >
> > /**
> > - * struct analogbits_wrpll_cfg - WRPLL configuration values
> > - * @divr: reference divider value (6 bits), as presented to the PLL signals.
> > - * @divf: feedback divider value (9 bits), as presented to the PLL signals.
> > - * @divq: output divider value (3 bits), as presented to the PLL signals.
> > - * @flags: PLL configuration flags. See above for more information.
> > - * @range: PLL loop filter range. See below for more information.
> > - * @_output_rate_cache: cached output rates, swept across DIVQ.
> > - * @_parent_rate: PLL refclk rate for which values are valid
> > - * @_max_r: maximum possible R divider value, given @parent_rate
> > - * @_init_r: initial R divider value to start the search from
> > + * struct wrpll_cfg - WRPLL configuration values
> > + * @divr: reference divider value (6 bits), as presented to the PLL
> > + signals
> > + * @divf: feedback divider value (9 bits), as presented to the PLL
> > + signals
> > + * @divq: output divider value (3 bits), as presented to the PLL
> > + signals
> > + * @flags: PLL configuration flags. See above for more information
> > + * @range: PLL loop filter range. See below for more information
> > + * @output_rate_cache: cached output rates, swept across DIVQ
> > + * @parent_rate: PLL refclk rate for which values are valid
> > + * @max_r: maximum possible R divider value, given @parent_rate
> > + * @init_r: initial R divider value to start the search from
> > *
> > * @divr, @divq, @divq, @range represent what the PLL expects to see
> > * on its input signals. Thus @divr and @divf are the actual divisors
> > * minus one. @divq is a power-of-two divider; for example, 1 =
> > * divide-by-2 and 6 = divide-by-64. 0 is an invalid @divq value.
> > *
> > - * When initially passing a struct analogbits_wrpll_cfg record, the
> > + * When initially passing a struct wrpll_cfg record, the
> > * record should be zero-initialized with the exception of the @flags
> > * field. The only flag bits that need to be set are either
> > * WRPLL_FLAGS_INT_FEEDBACK or WRPLL_FLAGS_EXT_FEEDBACK.
> > - *
> > - * Field names beginning with an underscore should be considered
> > - * private to the wrpll-cln28hpc.c code.
> > */
> > -struct analogbits_wrpll_cfg {
> > +struct wrpll_cfg {
> > u8 divr;
> > u8 divq;
> > u8 range;
> > u8 flags;
> > u16 divf;
> > - u32 _output_rate_cache[DIVQ_VALUES];
> > - unsigned long _parent_rate;
> > - u8 _max_r;
> > - u8 _init_r;
> > +/* private: */
> > + u32 output_rate_cache[DIVQ_VALUES];
> > + unsigned long parent_rate;
> > + u8 max_r;
> > + u8 init_r;
> > };
> >
> > -/*
> > - * Function prototypes
> > - */
> > -
> > -int analogbits_wrpll_configure_for_rate(struct analogbits_wrpll_cfg *c,
> > - u32 target_rate,
> > - unsigned long parent_rate);
> > +int wrpll_configure_for_rate(struct wrpll_cfg *c, u32 target_rate,
> > + unsigned long parent_rate);
> >
> > -unsigned int analogbits_wrpll_calc_max_lock_us(struct analogbits_wrpll_cfg
> > *c);
> > +unsigned int wrpll_calc_max_lock_us(const struct wrpll_cfg *c);
> >
> > -unsigned long analogbits_wrpll_calc_output_rate(struct analogbits_wrpll_cfg
> > *c,
> > - unsigned long parent_rate);
> > +unsigned long wrpll_calc_output_rate(const struct wrpll_cfg *c,
> > + unsigned long parent_rate);
> >
> > #endif /* __LINUX_CLK_ANALOGBITS_WRPLL_CLN28HPC_H */
Applied to u-boot-riscv/master, thanks!
Rick
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