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([2600:8803:e7e4:1d00:1120:d1cf:c64a:ac7e]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-732264d59e1sm102555a34.34.2025.05.08.09.45.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 May 2025 09:45:51 -0700 (PDT) Message-ID: <37ae4941-da7e-4298-8269-b5faf29fffdd@baylibre.com> Date: Thu, 8 May 2025 11:45:50 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/4] iio: adc: adi-axi-adc: add set decimation rate To: Pop Ioan Daniel , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sergiu Cuciurean , Dragos Bogdan , Antoniu Miclaus , Olivier Moysan , Javier Carrasco , Matti Vaittinen , Tobias Sperling , Marcelo Schmitt , Alisa-Dariana Roman , Esteban Blanc , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250508123107.3797042-1-pop.ioan-daniel@analog.com> <20250508123107.3797042-3-pop.ioan-daniel@analog.com> From: David Lechner Content-Language: en-US In-Reply-To: <20250508123107.3797042-3-pop.ioan-daniel@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/8/25 7:30 AM, Pop Ioan Daniel wrote: > Add support for setting decimation rate. > > Signed-off-by: Pop Ioan Daniel > --- > changes in v2: > - update ADI_AXI_ADC_REG_CHAN_USR_CTRL_2 register in a per-channel register > - rename ADI_AXI_ADC_DEC_RATE_MASK in > ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK > - add channel index parameter to keep axi_adc_set_dec_rate generic > - remove ad7405 chip-specific struct > drivers/iio/adc/adi-axi-adc.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c > index 9e8c30230791..33eb8f337e0b 100644 > --- a/drivers/iio/adc/adi-axi-adc.c > +++ b/drivers/iio/adc/adi-axi-adc.c > @@ -80,6 +80,9 @@ > #define ADI_AXI_ADC_REG_CHAN_CTRL_3(c) (0x0418 + (c) * 0x40) > #define ADI_AXI_ADC_CHAN_PN_SEL_MASK GENMASK(19, 16) > > +#define ADI_AXI_ADC_REG_CHAN_USR_CTRL_2(c) (0x0424 + (c) * 0x40) > +#define ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK GENMASK(15, 0) > + > /* IO Delays */ > #define ADI_AXI_ADC_REG_DELAY(l) (0x0800 + (l) * 0x4) > #define AXI_ADC_DELAY_CTRL_MASK GENMASK(4, 0) > @@ -242,6 +245,17 @@ static int axi_adc_test_pattern_set(struct iio_backend *back, > } > } > > +static int axi_adc_set_dec_rate(struct iio_backend *back, unsigned int chan, > + unsigned int rate) > +{ > + struct adi_axi_adc_state *st = iio_backend_get_priv(back); > + > + return regmap_update_bits(st->regmap, > + ADI_AXI_ADC_REG_CHAN_USR_CTRL_2(chan), > + ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK, > + FIELD_PREP(ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK, rate)); Rate is getting a bit far past 80 chars, so would be nice to wrap that line. > +} > + > static int axi_adc_read_chan_status(struct adi_axi_adc_state *st, unsigned int chan, > unsigned int *status) > { > @@ -550,6 +564,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = { > .test_pattern_set = axi_adc_test_pattern_set, > .chan_status = axi_adc_chan_status, > .interface_type_get = axi_adc_interface_type_get, > + .oversampling_ratio_set = axi_adc_set_dec_rate, Would make more sense if function was named axi_adc_oversampling_ratio_set. (Making the names match exactly (with namespace prefix added) make less info you have to hold in your head when reading the driver.) > .debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access), > .debugfs_print_chan_status = iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status), > };