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Thu, 10 Sep 2026 13:37:14 -0400 From: Janani Sunil Date: Thu, 10 Sep 2026 19:36:25 +0200 Subject: [PATCH v7 07/17] iio: adc: ad7768: Add power mode helper Precedence: bulk X-Mailing-List: devicetree@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: <20260910-ad7768-driver-v7-7-7f70b07627e1@analog.com> References: <20260910-ad7768-driver-v7-0-7f70b07627e1@analog.com> In-Reply-To: <20260910-ad7768-driver-v7-0-7f70b07627e1@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 , Randy Dunlap CC: , , , , , , , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Janani Sunil , Jonathan Cameron X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1789061788; 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Replace the open-coded fast-mode setup with a helper that records the active mode, preparing for dynamic mode selection. Signed-off-by: Janani Sunil --- drivers/iio/adc/ad7768.c | 48 +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 41 insertions(+), 7 deletions(-) diff --git a/drivers/iio/adc/ad7768.c b/drivers/iio/adc/ad7768.c index 44ba19fb2096..be815b8c6766 100644 --- a/drivers/iio/adc/ad7768.c +++ b/drivers/iio/adc/ad7768.c @@ -41,6 +41,8 @@ #define AD7768_REG_POWER_MODE 0x04 #define AD7768_SLEEP_MODE_MSK BIT(7) #define AD7768_POWER_MODE_POWER_MODE_MSK GENMASK(5, 4) +#define AD7768_POWER_MODE_POWER_MODE_LOW 0x0 +#define AD7768_POWER_MODE_POWER_MODE_MEDIAN 0x2 #define AD7768_POWER_MODE_POWER_MODE_FAST 0x3 #define AD7768_POWER_MODE_LVDS_ENABLE BIT(3) #define AD7768_POWER_MODE_MCLK_DIV_MSK GENMASK(1, 0) @@ -102,6 +104,17 @@ enum ad7768_clock_source { AD7768_CLOCK_SOURCE_LVDS, }; +struct ad7768_power_mode_info { + unsigned int mode; + unsigned int mclk_div; +}; + +static const struct ad7768_power_mode_info ad7768_power_modes[] = { + { .mode = AD7768_POWER_MODE_POWER_MODE_LOW, .mclk_div = 32 }, + { .mode = AD7768_POWER_MODE_POWER_MODE_MEDIAN, .mclk_div = 8 }, + { .mode = AD7768_POWER_MODE_POWER_MODE_FAST, .mclk_div = 4 }, +}; + struct ad7768_precharge_config { bool prebufp_en; bool prebufn_en; @@ -127,6 +140,7 @@ struct ad7768_state { const struct ad7768_chip_info *chip_info; struct iio_backend *back; unsigned int vref_uV[2]; + unsigned int power_mode_idx; __be16 d16 __aligned(IIO_DMA_MINALIGN); }; @@ -330,6 +344,32 @@ static int ad7768_sync(struct ad7768_state *st) AD7768_DATA_CONTROL_SPI_SYNC); } +static int ad7768_set_power_mode(struct ad7768_state *st, + unsigned int mode_idx) +{ + const struct ad7768_power_mode_info *mode_info; + int ret; + + mode_info = &ad7768_power_modes[mode_idx]; + ret = regmap_update_bits(st->regmap, AD7768_REG_POWER_MODE, + AD7768_POWER_MODE_POWER_MODE_MSK | + AD7768_POWER_MODE_MCLK_DIV_MSK, + FIELD_PREP(AD7768_POWER_MODE_POWER_MODE_MSK, + mode_info->mode) | + FIELD_PREP(AD7768_POWER_MODE_MCLK_DIV_MSK, + mode_info->mode)); + if (ret) + return ret; + + ret = ad7768_sync(st); + if (ret) + return ret; + + st->power_mode_idx = mode_idx; + + return 0; +} + static int ad7768_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { @@ -489,13 +529,7 @@ static int ad7768_configure_capture(struct ad7768_state *st) unsigned int dclk_div; int ret; - ret = regmap_update_bits(st->regmap, AD7768_REG_POWER_MODE, - AD7768_POWER_MODE_POWER_MODE_MSK | - AD7768_POWER_MODE_MCLK_DIV_MSK, - FIELD_PREP(AD7768_POWER_MODE_POWER_MODE_MSK, - AD7768_POWER_MODE_POWER_MODE_FAST) | - FIELD_PREP(AD7768_POWER_MODE_MCLK_DIV_MSK, - AD7768_POWER_MODE_POWER_MODE_FAST)); + ret = ad7768_set_power_mode(st, ARRAY_SIZE(ad7768_power_modes) - 1); if (ret) return ret; -- 2.43.0