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Thu, 13 Aug 2026 09:57:57 -0400 From: Janani Sunil Date: Thu, 13 Aug 2026 15:57:01 +0200 Subject: [PATCH v3 08/14] iio: adc: ad7768: Add per-channel conversion delay Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260813-ad7768-driver-v3-8-cb554399ad26@analog.com> References: <20260813-ad7768-driver-v3-0-cb554399ad26@analog.com> In-Reply-To: <20260813-ad7768-driver-v3-0-cb554399ad26@analog.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Michael Hennerich , Jonathan Cameron , "David Lechner" , Andy Shevchenko , "Rob Herring" , Krzysztof Kozlowski , "Conor Dooley" , Olivier Moysan , Philipp Zabel , Linus Walleij , Bartosz Golaszewski , Jonathan Corbet , Shuah Khan , Michael Walle CC: , , , , , , , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Janani Sunil X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786629444; l=6597; i=janani.sunil@analog.com; 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Derive the delay resolution from MCLK, power mode and decimation rate. Validate the requested delay and program the corresponding phase register when applying the active channel configuration. Signed-off-by: Janani Sunil --- drivers/iio/adc/ad7768.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) diff --git a/drivers/iio/adc/ad7768.c b/drivers/iio/adc/ad7768.c index 08721079bb37..d332695cc75d 100644 --- a/drivers/iio/adc/ad7768.c +++ b/drivers/iio/adc/ad7768.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -130,6 +131,12 @@ struct ad7768_freq_config { unsigned int dec_rate; }; +struct ad7768_convdelay_params { + unsigned int shift; + unsigned int max_raw; + u64 step_ps; +}; + struct ad7768_avail_freq { unsigned int n_freqs; unsigned int freqs[MAX_FREQ_PER_MODE]; @@ -157,6 +164,7 @@ struct ad7768_state { unsigned int n_freqs; int freqs[AD7768_MAX_FREQS]; unsigned int ch_freq[AD7768_MAX_CHANNEL]; + u64 ch_convdelay_ps[AD7768_MAX_CHANNEL]; enum ad7768_filter_type ch_filter[AD7768_MAX_CHANNEL]; struct iio_backend *back; @@ -223,6 +231,12 @@ static unsigned int ad7768_gain_reg(const struct ad7768_state *st, return AD7768_REG_GAIN(st->chip_info->chan_map[ch]); } +static unsigned int ad7768_phase_reg(const struct ad7768_state *st, + unsigned int ch) +{ + return AD7768_REG_PHASE(st->chip_info->chan_map[ch]); +} + static u8 ad7768_precharge_buf1_mask(const struct ad7768_state *st, u16 val) { return val & GENMASK(st->chip_info->prebuf_split - 1, 0); @@ -569,6 +583,105 @@ static int ad7768_set_sampling_freq(struct iio_dev *indio_dev, return 0; } +static int ad7768_get_freq_cfg(struct ad7768_state *st, unsigned int freq, + struct ad7768_freq_config *f_cfg) +{ + for (unsigned int i = 0; + i < st->avail_freq[st->power_mode].n_freqs; i++) { + *f_cfg = st->avail_freq[st->power_mode].freq_cfg[i]; + if (freq == f_cfg->freq_hz) + return 0; + } + + return -EINVAL; +} + +static int ad7768_get_convdelay_params(struct ad7768_state *st, unsigned int ch, + struct ad7768_convdelay_params *params) +{ + struct ad7768_freq_config f_cfg; + unsigned int dec_rate; + unsigned int mult; + u64 mclk; + int ret; + + ret = ad7768_get_freq_cfg(st, st->ch_freq[ch], &f_cfg); + if (ret) + return ret; + + dec_rate = ad7768_dec_rate[f_cfg.dec_rate]; + switch (dec_rate) { + case 32: + params->shift = 3; + params->max_raw = 31; + mult = 1; + break; + case 64: + params->shift = 2; + params->max_raw = 63; + mult = 1; + break; + case 128: + params->shift = 1; + params->max_raw = 127; + mult = 1; + break; + case 256: + params->shift = 0; + params->max_raw = 255; + mult = 1; + break; + case 512: + params->shift = 0; + params->max_raw = 255; + mult = 2; + break; + case 1024: + params->shift = 0; + params->max_raw = 255; + mult = 4; + break; + default: + return -EINVAL; + } + + mclk = clk_get_rate(st->mclk); + if (!mclk) + return -EINVAL; + + params->step_ps = DIV_ROUND_CLOSEST_ULL((u64)mult * + PSEC_PER_SEC * + ad7768_mclk_div[st->power_mode], + mclk); + + return 0; +} + +static int ad7768_set_channel_convdelay(struct ad7768_state *st, + unsigned int ch) +{ + struct ad7768_convdelay_params params; + u64 delay_ps = st->ch_convdelay_ps[ch]; + u64 max_delay_ps; + u64 raw; + int ret; + + ret = ad7768_get_convdelay_params(st, ch, ¶ms); + if (ret) + return ret; + + max_delay_ps = (u64)params.max_raw * params.step_ps; + if (delay_ps > max_delay_ps) + return -EINVAL; + + raw = DIV_ROUND_CLOSEST_ULL(delay_ps, params.step_ps); + if (raw > params.max_raw) + return -EINVAL; + + return regmap_write(st->regmap, ad7768_phase_reg(st, ch), + raw << params.shift); +} + static void ad7768_filter_wait(const unsigned int *mode_freq, const enum ad7768_filter_type *mode_filter, const bool *mode_used) @@ -687,6 +800,19 @@ static int ad7768_apply_channel_modes(struct iio_dev *indio_dev, max_freq = max(max_freq, mode_freq[mode]); } + for (c = 0; c < st->chip_info->num_channels; c++) { + if (!test_bit(c, scan_mask)) + continue; + + ret = ad7768_set_channel_convdelay(st, c); + if (ret == -EINVAL) + return dev_err_probe(regmap_get_device(st->regmap), ret, + "Invalid conversion delay for channel %u\n", + c); + if (ret) + return ret; + } + ret = ad7768_set_clk_divs(st, max_freq); if (ret) return ret; @@ -737,6 +863,13 @@ static int ad7768_read_raw(struct iio_dev *indio_dev, *val = calib; return IIO_VAL_INT; + case IIO_CHAN_INFO_CONVDELAY: { + guard(mutex)(&st->lock); + iio_val_s64_decompose(st->ch_convdelay_ps[chan->channel], + val, val2); + + return IIO_VAL_DECIMAL64_PICO; + } default: return -EINVAL; } @@ -750,6 +883,8 @@ static int ad7768_write_raw_get_fmt(struct iio_dev *indio_dev, case IIO_CHAN_INFO_CALIBBIAS: case IIO_CHAN_INFO_CALIBSCALE: return IIO_VAL_INT; + case IIO_CHAN_INFO_CONVDELAY: + return IIO_VAL_DECIMAL64_PICO; default: return -EINVAL; } @@ -760,6 +895,7 @@ static int ad7768_write_raw(struct iio_dev *indio_dev, int val, int val2, long info) { struct ad7768_state *st = iio_priv(indio_dev); + s64 delay_ps; unsigned int base_reg; int ret; @@ -787,6 +923,15 @@ static int ad7768_write_raw(struct iio_dev *indio_dev, base_reg = ad7768_get_calib_reg_base(st, chan, true); return ad7768_write_calib_value(st, base_reg, val); + case IIO_CHAN_INFO_CONVDELAY: { + delay_ps = iio_val_s64_compose(val, val2); + if (delay_ps < 0) + return -EINVAL; + + guard(mutex)(&st->lock); + st->ch_convdelay_ps[chan->channel] = delay_ps; + return 0; + } default: return -EINVAL; } @@ -1080,6 +1225,7 @@ static int ad7768_parse_config(struct iio_dev *indio_dev, .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_CALIBSCALE) | + BIT(IIO_CHAN_INFO_CONVDELAY) | BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), -- 2.43.0