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Tue, 30 Jun 2026 10:18:46 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 30 Jun 2026 12:18:38 -0500 Message-Id: To: "Jonathan Cameron" , "Kurt Borja" Cc: "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "David Lechner" , =?utf-8?q?Nuno_S=C3=A1?= , "Andy Shevchenko" , , , Subject: Re: [PATCH v2 4/7] iio: adc: ti-ads1262: Add excitation current support From: "Kurt Borja" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260628-ads126x-v2-0-4b1b231325ba@gmail.com> <20260628-ads126x-v2-4-4b1b231325ba@gmail.com> <20260630014723.786a8885@jic23-huawei> In-Reply-To: <20260630014723.786a8885@jic23-huawei> On Mon Jun 29, 2026 at 7:47 PM -05, Jonathan Cameron wrote: > On Sun, 28 Jun 2026 00:36:05 -0500 > Kurt Borja wrote: > >> 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". >>=20 >> Signed-off-by: Kurt Borja >> --- >> drivers/iio/adc/ti-ads1262.c | 78 +++++++++++++++++++++++++++++++++++++= +++++-- >> 1 file changed, 76 insertions(+), 2 deletions(-) >>=20 >> 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 >> }; >> =20 >> +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 > > _LAST usually means inclusive. So probably call this NUM or something lik= e that > to show that it should be one more than last value. > >> +}; > >> @@ -450,7 +468,7 @@ static int ads1262_dev_read_by_cmd(struct ads1262 *s= t, 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; >> =20 >> /* Avoid using guard() here to mitigate AB/BA deadlock warning */ >> @@ -464,6 +482,10 @@ static int ads1262_channel_enable(struct ads1262 *s= t, >> FIELD_PREP(ADS1262_MODE2_BYPASS_MASK, chan->pga_bypass); >> inpmux =3D FIELD_PREP(ADS1262_INPMUX_MUXN_MASK, chan->input[1]) | >> FIELD_PREP(ADS1262_INPMUX_MUXP_MASK, chan->input[0]); >> + idacmux =3D FIELD_PREP(ADS1262_IDACMUX_MUX1_MASK, chan->idac_mux[0]) | >> + FIELD_PREP(ADS1262_IDACMUX_MUX2_MASK, chan->idac_mux[1]); >> + idacmag =3D FIELD_PREP(ADS1262_IDACMAG_MAG1_MASK, chan->idac_mag[0]) | >> + FIELD_PREP(ADS1262_IDACMAG_MAG2_MASK, chan->idac_mag[1]); > > This presumably feeds into the discussion of locking that you were having > with David, but I'd find this a lot easier to read if these were just > above where the values are used. Then we can clearly see the match betwee= n > masks and fields. If you have to do it like this, then add variables up > here for the masks as well. I'll move them above each regmap calls after reorganizing the locking stuff. > > >> refmux =3D FIELD_PREP(ADS1262_REFMUX_RMUXN_MASK, chan->reference[1]) | >> FIELD_PREP(ADS1262_REFMUX_RMUXP_MASK, chan->reference[0]); >> mutex_unlock(&st->chan_lock); --=20 Thanks, ~ Kurt