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Message-ID: <161aa7f4-299d-4486-92ad-3f3eab2f2979@baylibre.com>
Date: Mon, 14 Oct 2024 16:14:42 -0500
From: David Lechner <dlechner@...libre.com>
To: Angelo Dureghello <adureghello@...libre.com>, Nuno Sá
<nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v6 5/8] iio: dac: ad3552r: changes to use FIELD_PREP
On 10/14/24 5:08 AM, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
>
> Changes to use FIELD_PREP, so that driver-specific ad3552r_field_prep
> is removed. Variables (arrays) that was used to call ad3552r_field_prep
> are removed too.
>
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
Found one likely bug. The rest are suggestions to keep the static
analyzers happy.
\
> @@ -510,8 +416,14 @@ static int ad3552r_write_raw(struct iio_dev *indio_dev,
> val);
> break;
> case IIO_CHAN_INFO_ENABLE:
> - err = ad3552r_set_ch_value(dac, AD3552R_CH_DAC_POWERDOWN,
> - chan->channel, !val);
> + if (chan->channel == 0)
> + val = FIELD_PREP(AD3552R_MASK_CH_DAC_POWERDOWN(0), !val);
> + else
> + val = FIELD_PREP(AD3552R_MASK_CH_DAC_POWERDOWN(1), !val);
In the past, I've had bots (Sparse, IIRC) complain about using !val
with FIELD_PREP. Alternative is to write it as val ? 1 : 0.
> +
> + err = ad3552r_update_reg_field(dac, AD3552R_REG_ADDR_POWERDOWN_CONFIG,
> + AD3552R_MASK_CH_DAC_POWERDOWN(chan->channel),
> + val);
> break;
> default:
> err = -EINVAL;
> @@ -715,9 +627,9 @@ static int ad3552r_reset(struct ad3552r_desc *dac)
> }
>
> return ad3552r_update_reg_field(dac,
> - addr_mask_map[AD3552R_ADDR_ASCENSION][0],
> - addr_mask_map[AD3552R_ADDR_ASCENSION][1],
> - val);
> + AD3552R_REG_ADDR_INTERFACE_CONFIG_A,
> + AD3552R_MASK_ADDR_ASCENSION,
> + FIELD_PREP(AD3552R_MASK_ADDR_ASCENSION, val));
> }
>
> static void ad3552r_get_custom_range(struct ad3552r_desc *dac, s32 i, s32 *v_min,
> @@ -812,20 +724,20 @@ static int ad3552r_configure_custom_gain(struct ad3552r_desc *dac,
> "mandatory custom-output-range-config property missing\n");
>
> dac->ch_data[ch].range_override = 1;
> - reg |= ad3552r_field_prep(1, AD3552R_MASK_CH_RANGE_OVERRIDE);
> + reg |= FIELD_PREP(AD3552R_MASK_CH_RANGE_OVERRIDE, 1);
>
> err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-p", &val);
> if (err)
> return dev_err_probe(dev, err,
> "mandatory adi,gain-scaling-p property missing\n");
> - reg |= ad3552r_field_prep(val, AD3552R_MASK_CH_GAIN_SCALING_P);
> + reg |= FIELD_PREP(AD3552R_MASK_CH_GAIN_SCALING_P, val);
> dac->ch_data[ch].p = val;
>
> err = fwnode_property_read_u32(gain_child, "adi,gain-scaling-n", &val);
> if (err)
> return dev_err_probe(dev, err,
> "mandatory adi,gain-scaling-n property missing\n");
> - reg |= ad3552r_field_prep(val, AD3552R_MASK_CH_GAIN_SCALING_N);
> + reg |= FIELD_PREP(AD3552R_MASK_CH_GAIN_SCALING_N, val);
> dac->ch_data[ch].n = val;
>
> err = fwnode_property_read_u32(gain_child, "adi,rfb-ohms", &val);
> @@ -841,9 +753,9 @@ static int ad3552r_configure_custom_gain(struct ad3552r_desc *dac,
> dac->ch_data[ch].gain_offset = val;
>
> offset = abs((s32)val);
> - reg |= ad3552r_field_prep((offset >> 8), AD3552R_MASK_CH_OFFSET_BIT_8);
> + reg |= FIELD_PREP(AD3552R_MASK_CH_OFFSET_BIT_8, (offset >> 8));
Can drop () from (offset >> 8).
>
> - reg |= ad3552r_field_prep((s32)val < 0, AD3552R_MASK_CH_OFFSET_POLARITY);
> + reg |= FIELD_PREP(AD3552R_MASK_CH_OFFSET_POLARITY, (s32)val < 0);
Instead of (s32) cast, could write val < 0 : 1 : 0 (to be consistent with
suggestion above for replacing !val).
> addr = AD3552R_REG_ADDR_CH_GAIN(ch);
> err = ad3552r_write_reg(dac, addr,
> offset & AD3552R_MASK_CH_OFFSET_BITS_0_7);
> @@ -886,9 +798,9 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
> }
>
> err = ad3552r_update_reg_field(dac,
> - addr_mask_map[AD3552R_VREF_SELECT][0],
> - addr_mask_map[AD3552R_VREF_SELECT][1],
> - val);
> + AD3552R_REG_ADDR_SH_REFERENCE_CONFIG,
> + AD3552R_MASK_REFERENCE_VOLTAGE_SEL,
> + FIELD_PREP(AD3552R_MASK_REFERENCE_VOLTAGE_SEL, val));
> if (err)
> return err;
>
> @@ -900,9 +812,9 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
> }
>
> err = ad3552r_update_reg_field(dac,
> - addr_mask_map[AD3552R_SDO_DRIVE_STRENGTH][0],
> - addr_mask_map[AD3552R_SDO_DRIVE_STRENGTH][1],
> - val);
> + AD3552R_REG_ADDR_INTERFACE_CONFIG_D,
> + AD3552R_MASK_SDO_DRIVE_STRENGTH,
> + FIELD_PREP(AD3552R_MASK_SDO_DRIVE_STRENGTH, val));
> if (err)
> return err;
> }
> @@ -938,9 +850,15 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
> "Invalid adi,output-range-microvolt value\n");
>
> val = err;
> - err = ad3552r_set_ch_value(dac,
> - AD3552R_CH_OUTPUT_RANGE_SEL,
> - ch, val);
> + if (ch == 0)
> + val = FIELD_PREP(AD3552R_MASK_CH_OUTPUT_RANGE_SEL(0), val);
> + else
> + val = FIELD_PREP(AD3552R_MASK_CH_OUTPUT_RANGE_SEL(1), val);
> +
> + err = ad3552r_update_reg_field(dac,
> + AD3552R_REG_ADDR_CH0_CH1_OUTPUT_RANGE,
> + AD3552R_MASK_CH_OUTPUT_RANGE_SEL(ch),
> + val);
> if (err)
> return err;
>
> @@ -958,7 +876,14 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
> ad3552r_calc_gain_and_offset(dac, ch);
> dac->enabled_ch |= BIT(ch);
>
> - err = ad3552r_set_ch_value(dac, AD3552R_CH_SELECT, ch, 1);
> + if (ch == 0)
> + val = FIELD_PREP(AD3552R_MASK_CH(0), 1);
> + else
> + val = FIELD_PREP(AD3552R_MASK_CH(1), 1);
> +
> + err = ad3552r_update_reg_field(dac,
> + AD3552R_REG_ADDR_CH_SELECT_16B,
> + AD3552R_MASK_CH(ch), val);
> if (err < 0)
> return err;
>
> @@ -970,8 +895,15 @@ static int ad3552r_configure_device(struct ad3552r_desc *dac)
> /* Disable unused channels */
> for_each_clear_bit(ch, &dac->enabled_ch,
> dac->model_data->num_hw_channels) {
> - err = ad3552r_set_ch_value(dac, AD3552R_CH_AMPLIFIER_POWERDOWN,
> - ch, 1);
> + if (ch == 0)
> + val = FIELD_PREP(AD3552R_MASK_CH_OUTPUT_RANGE_SEL(0), 1);
> + else
> + val = FIELD_PREP(AD3552R_MASK_CH_OUTPUT_RANGE_SEL(1), 1);
Should these be AD3552R_MASK_CH_AMPLIFIER_POWERDOWN instead of
AD3552R_MASK_CH_OUTPUT_RANGE_SEL? (2 above and 1 below.)
> +
> + err = ad3552r_update_reg_field(dac,
> + AD3552R_REG_ADDR_POWERDOWN_CONFIG,
> + AD3552R_MASK_CH_OUTPUT_RANGE_SEL(ch),
> + val);
> if (err)
> return err;
> }
>
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