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ptp_phc: convert .adjfreq to .adjfine

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The ptp_phc implementation of .adjfreq is implemented in terms of a
straight forward "base * ppb / 1 billion" calculation.

Convert this to the newer .adjfine, updating the driver to use the recently
introduced adjust_by_scaled_ppm helper function.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacob Keller 2022-11-09 15:09:37 -08:00 committed by David S. Miller
parent 3b738db50f
commit 2e77eded8e
1 changed files with 4 additions and 15 deletions
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19
drivers/ptp/ptp_pch.c
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@ -336,24 +336,13 @@ static irqreturn_t isr(int irq, void *priv)
* PTP clock operations
*/
static int ptp_pch_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
static int ptp_pch_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
u64 adj;
u32 diff, addend;
int neg_adj = 0;
u32 addend;
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
struct pch_ts_regs __iomem *regs = pch_dev->regs;
if (ppb < 0) {
neg_adj = 1;
ppb = -ppb;
}
addend = DEFAULT_ADDEND;
adj = addend;
adj *= ppb;
diff = div_u64(adj, 1000000000ULL);
addend = neg_adj ? addend - diff : addend + diff;
addend = adjust_by_scaled_ppm(DEFAULT_ADDEND, scaled_ppm);
iowrite32(addend, &regs->addend);
@ -440,7 +429,7 @@ static const struct ptp_clock_info ptp_pch_caps = {
.n_ext_ts = N_EXT_TS,
.n_pins = 0,
.pps = 0,
.adjfreq = ptp_pch_adjfreq,
.adjfine = ptp_pch_adjfine,
.adjtime = ptp_pch_adjtime,
.gettime64 = ptp_pch_gettime,
.settime64 = ptp_pch_settime,