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Wed, 25 Mar 2026 03:14:03 -0700 (PDT) Message-ID: <975f2df6090f3aea0524369ef07f2a648064f010.camel@gmail.com> Subject: Re: [PATCH v3 2/2] iio: dac: ad5706r: Add support for AD5706R DAC From: Nuno =?ISO-8859-1?Q?S=E1?= To: "Torreno, Alexis Czezar" , Jonathan Cameron Cc: Lars-Peter Clausen , "Hennerich, Michael" , David Lechner , "Sa, Nuno" , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , "linux-iio@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" Date: Wed, 25 Mar 2026 10:14:50 +0000 In-Reply-To: References: <20260318-dev_ad5706r-v3-0-5d078f41e988@analog.com> <20260318-dev_ad5706r-v3-2-5d078f41e988@analog.com> <20260321183909.45761710@jic23-huawei> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-03-25 at 03:13 +0000, Torreno, Alexis Czezar wrote: > > > > + ret =3D spi_sync_transfer(st->spi, xfer, ARRAY_SIZE(xfer)); > > >=20 > > > Can you use spi_write_the_read()? > > > Has the added advantage that it bounces the data so doesn't need DMA = safe. > > > Can also use more meaningful types like > > > __be16 tx; > > > __be16 rx16; > > > u8 rx8; > >=20 > > Ok, will shift to spi_write_the_read(). There was another place to use = this > > above, just trimmed it off here. Noted on the more meaningful variables= . > >=20 >=20 > I only just checked spi_write_then_read() but, it seems this doesn't supp= ort > variable spi_speed_frequency for my future patches. Should I still use it= for now > and revert in the future? There's still the open regmap discussion. Independent of that, if you can't= use spi_write_then_read(), you need to make sure the buffers you pass spi are D= MA safe. - Nuno S=C3=A1