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Sat, 27 Jun 2026 22:36:34 -0700 (PDT) From: Kurt Borja Date: Sun, 28 Jun 2026 00:36:05 -0500 Subject: [PATCH v2 4/7] iio: adc: ti-ads1262: Add excitation current support Precedence: bulk X-Mailing-List: linux-kernel@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: <20260628-ads126x-v2-4-4b1b231325ba@gmail.com> References: <20260628-ads126x-v2-0-4b1b231325ba@gmail.com> In-Reply-To: <20260628-ads126x-v2-0-4b1b231325ba@gmail.com> To: Kurt Borja , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Lechner Cc: =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Cameron X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=5127; i=kuurtb@gmail.com; h=from:subject:message-id; bh=phGDKF/7ypWNAiTnvOwLVxua6NDi5KzvTxXMTomI5HA=; b=owGbwMvMwCUmluBs8WX+lTTG02pJDFkOm25sZW3t1VjStOD41IuRci0li1l49UJPXfPVViwx3 MU5LVS7o5SFQYyLQVZMkaU9YdG3R1F5b/0OhN6HmcPKBDKEgYtTACZSP5OR4fdFE4to7+NzW4yT Ct5slTkYr/xnIndWUE7LbI6d62p5UhgZtvU5zI2ddEiKd+ZU01OCrzdU3MvenrG2csbxhV6uUzo ecAEA X-Developer-Key: i=kuurtb@gmail.com; a=openpgp; fpr=54D3BE170AEF777983C3C63B57E3B6585920A69A Support the two IDAC excitation current sources. Each channel can route its IDAC1/IDAC2 outputs to a pin via the "excitation-channels" property and select a magnitude via "excitation-current-nanoamp". Signed-off-by: Kurt Borja --- drivers/iio/adc/ti-ads1262.c | 78 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 76 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ti-ads1262.c b/drivers/iio/adc/ti-ads1262.c index ece97a0c2b1304ad..8921eaae537f6b0a 100644 --- a/drivers/iio/adc/ti-ads1262.c +++ b/drivers/iio/adc/ti-ads1262.c @@ -193,6 +193,22 @@ enum { ADS1262_INPMUX_LAST }; +enum { + ADS1262_IDACMUX_AIN0, + ADS1262_IDACMUX_AIN1, + ADS1262_IDACMUX_AIN2, + ADS1262_IDACMUX_AIN3, + ADS1262_IDACMUX_AIN4, + ADS1262_IDACMUX_AIN5, + ADS1262_IDACMUX_AIN6, + ADS1262_IDACMUX_AIN7, + ADS1262_IDACMUX_AIN8, + ADS1262_IDACMUX_AIN9, + ADS1262_IDACMUX_AINCOM, + ADS1262_IDACMUX_NO_CONN, + ADS1262_IDACMUX_LAST +}; + enum { ADS1262_REFMUX_INTERNAL, ADS1262_REFMUX_AIN0_AIN1, @@ -213,6 +229,8 @@ struct ads1262_channel { u8 gain; u8 data_rate; u8 reference[3]; + u8 idac_mux[2]; + u8 idac_mag[2]; u8 pga_bypass:1; u8 ref_reversal:1; u8 input_chop:1; @@ -450,7 +468,7 @@ static int ads1262_dev_read_by_cmd(struct ads1262 *st, u8 cmd, __be32 *val) static int ads1262_channel_enable(struct ads1262 *st, struct ads1262_channel *chan) { - u8 mode0, mode1, mode2, inpmux, refmux; + u8 mode0, mode1, mode2, inpmux, idacmux, idacmag, refmux; int ret; /* Avoid using guard() here to mitigate AB/BA deadlock warning */ @@ -464,6 +482,10 @@ static int ads1262_channel_enable(struct ads1262 *st, FIELD_PREP(ADS1262_MODE2_BYPASS_MASK, chan->pga_bypass); inpmux = FIELD_PREP(ADS1262_INPMUX_MUXN_MASK, chan->input[1]) | FIELD_PREP(ADS1262_INPMUX_MUXP_MASK, chan->input[0]); + idacmux = FIELD_PREP(ADS1262_IDACMUX_MUX1_MASK, chan->idac_mux[0]) | + FIELD_PREP(ADS1262_IDACMUX_MUX2_MASK, chan->idac_mux[1]); + idacmag = FIELD_PREP(ADS1262_IDACMAG_MAG1_MASK, chan->idac_mag[0]) | + FIELD_PREP(ADS1262_IDACMAG_MAG2_MASK, chan->idac_mag[1]); refmux = FIELD_PREP(ADS1262_REFMUX_RMUXN_MASK, chan->reference[1]) | FIELD_PREP(ADS1262_REFMUX_RMUXP_MASK, chan->reference[0]); mutex_unlock(&st->chan_lock); @@ -493,6 +515,18 @@ static int ads1262_channel_enable(struct ads1262 *st, if (ret) return ret; + ret = regmap_update_bits(st->regmap, ADS1262_IDACMUX_REG, + ADS1262_IDACMUX_MUX1_MASK | + ADS1262_IDACMUX_MUX2_MASK, idacmux); + if (ret) + return ret; + + ret = regmap_update_bits(st->regmap, ADS1262_IDACMAG_REG, + ADS1262_IDACMAG_MAG1_MASK | + ADS1262_IDACMAG_MAG2_MASK, idacmag); + if (ret) + return ret; + return regmap_update_bits(st->regmap, ADS1262_REFMUX_REG, ADS1262_REFMUX_RMUXN_MASK | ADS1262_REFMUX_RMUXP_MASK, refmux); @@ -1040,13 +1074,19 @@ static int ads1262_parse_channel_node(struct ads1262 *st, struct fwnode_handle *node) { struct device *dev = &st->spi->dev; + static const u32 idac_nA[] = { + 0, 50000, 100000, 250000, 500000, 750000, + 1000000, 1500000, 2000000, 2500000, 3000000 + }; const char *ref_sources[3] = {}; - u32 pins[2]; + u32 pins[2], mags[2]; int ret; /* Write non-zero default configuration values */ chan->filter = ADS1262_FILTER_FIR; chan->data_rate = ADS1262_DR_20_SPS; + chan->idac_mux[0] = ADS1262_IDACMUX_NO_CONN; + chan->idac_mux[1] = ADS1262_IDACMUX_NO_CONN; ret = fwnode_property_read_u32_array(node, "diff-channels", pins, ARRAY_SIZE(pins)); if (ret) @@ -1086,6 +1126,40 @@ static int ads1262_parse_channel_node(struct ads1262 *st, } } + if (fwnode_property_present(node, "excitation-channels")) { + ret = fwnode_property_read_u32_array(node, "excitation-channels", + pins, ARRAY_SIZE(pins)); + if (ret) + return dev_err_probe(dev, ret, "%s: Failed to read excitation-channels\n", + fwnode_get_name(node)); + if (pins[0] >= ADS1262_IDACMUX_LAST || pins[1] >= ADS1262_IDACMUX_LAST) + return dev_err_probe(dev, -EINVAL, "%s: excitation-channels not in range\n", + fwnode_get_name(node)); + chan->idac_mux[0] = pins[0]; + chan->idac_mux[1] = pins[1]; + + ret = fwnode_property_read_u32_array(node, "excitation-current-nanoamp", + mags, ARRAY_SIZE(mags)); + if (ret) + return dev_err_probe(dev, ret, + "%s: Failed to read excitation-current-nanoamp\n", + fwnode_get_name(node)); + + ret = ads1262_find_one(idac_nA, mags[0]); + if (ret < 0) + return dev_err_probe(dev, ret, + "%s: Invalid excitation-current-nanoamp\n", + fwnode_get_name(node)); + chan->idac_mag[0] = ret; + + ret = ads1262_find_one(idac_nA, mags[1]); + if (ret < 0) + return dev_err_probe(dev, ret, + "%s: Invalid excitation-current-nanoamp\n", + fwnode_get_name(node)); + chan->idac_mag[1] = ret; + } + if (fwnode_property_present(node, "ti,pga-bypass")) chan->pga_bypass = 1; -- 2.54.0