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Fri, 20 Feb 2026 07:01:54 -0800 (PST) Message-ID: Subject: Re: [PATCH 2/3] iio: dac: ad5706r: Add support for AD5706R DAC From: Nuno =?ISO-8859-1?Q?S=E1?= To: Andy Shevchenko Cc: Alexis Czezar Torreno , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Nuno =?ISO-8859-1?Q?S=E1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Uwe =?ISO-8859-1?Q?Kleine-K=F6nig?= , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org Date: Fri, 20 Feb 2026 15:02:37 +0000 In-Reply-To: References: <20260220-dev_ad5706r-v1-0-7253bbd74889@analog.com> <20260220-dev_ad5706r-v1-2-7253bbd74889@analog.com> <4fd329ed6416fd2f8e2a72adfa5a77f73107948b.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-02-20 at 13:00 +0200, Andy Shevchenko wrote: > On Fri, Feb 20, 2026 at 10:48:59AM +0000, Nuno S=C3=A1 wrote: > > On Fri, 2026-02-20 at 16:02 +0800, Alexis Czezar Torreno wrote: >=20 > ... >=20 > > > +static void ad5706r_debugs_init(struct iio_dev *indio_dev) > > > +{ > > > + struct dentry *d =3D iio_get_debugfs_dentry(indio_dev); > >=20 > > It should have: > >=20 > > if (!IS_ENABLED(CONFIG_DEBUGFS)) > > return >=20 > But why? The debugfs is a stub when disabled, nobody should do that > in the cases when the main purpose is not the debugfs code. Because the compiler can then optimize away all of the above code... - Nuno S=C3=A1 >=20 > > > + debugfs_create_file_unsafe("streaming_addr", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_streaming_addr_fops); > > > + debugfs_create_file_unsafe("streaming_len", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_streaming_len_fops); > > > + debugfs_create_file_unsafe("streaming_data", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_streaming_data_fops); > > > + debugfs_create_file_unsafe("streaming_reg_access", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_streaming_reg_access_fops); > > > + debugfs_create_file_unsafe("spi_speed_hz_write", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_spi_speed_write_fops); > > > + debugfs_create_file_unsafe("spi_speed_hz_read", 0600, d, > > > + =C2=A0=C2=A0 indio_dev, &ad5706r_spi_speed_read_fops); > > > +} >=20 > ... >=20 > > > + /* Find which index has this register value */ > > > + for (i =3D 0; i < ARRAY_SIZE(mux_out_sel_reg_values); i++) { >=20 > for (size_t i...) >=20 > > > + if (mux_out_sel_reg_values[i] =3D=3D reg_byte) { > > > + st->mux_out_sel =3D i; > > > + return i;=C2=A0 /* Return index, not register value */ > > > + } > > > + } >=20 > ... >=20 > > > + return ret ? ret : len; >=20 > Use Elvis operator >=20 > return ret ?: len; >=20 > ... >=20 >=20 > > > + {}, >=20 > IIO has a style for terminator entry, along with confusing trailing comma= . > If it's a sentinel, it must be one even at a compile time. >=20 > > > +}; >=20 > ... >=20 > > > + st->debug_spi_speed_hz_write =3D 10000000; > > > + st->debug_spi_speed_hz_read =3D 10000000; >=20 > units.h and other headers for your help >=20 > 10 * HZ_PER_MHZ >=20 > ... >=20 > > > + st->sampling_frequency =3D 1000000; >=20 > In the similar way. >=20 > ... >=20 > > > + st->reference_volts =3D 2500; >=20 > 2.5kV?! I think you mistakenly put volts where should be _mV >=20 > ... >=20 > > > + for (i =3D 0; i < 4; i++) { >=20 > Magic 4. >=20 > > > + st->hw_active_edge[i] =3D HW_ACTIVE_EDGE_RISING_EDGE; > > > + st->range_sel[i] =3D RANGE_SEL_50; > > > + st->output_state[i] =3D OUTPUT_STATE_NORMAL_SW; > > > + st->ldac_trigger_chn[i] =3D LDAC_TRIGGER_CHN_HW_TRIGGER; > > > + st->toggle_trigger_chn[i] =3D TOGGLE_TRIGGER_CHN_HW_TRIGGER; > > > + st->dither_trigger_chn[i] =3D DITHER_TRIGGER_CHN_HW_TRIGGER; > > > + st->multi_dac_sel_ch[i] =3D MULTI_DAC_SEL_CH_EXCLUDE; >=20 > Hmm... Perhaps memsetXX()? But original loop with the defined iterator wi= ll be > okay: >=20 > for (unsigned int i =3D 0; i < $MAGIC_CONST; i++) { >=20 > > > + } >=20 > ... >=20 > > > + st->resetb_gpio =3D devm_gpiod_get_optional(dev, "dac-resetb", GPIO= D_OUT_LOW); > > > + if (IS_ERR(st->resetb_gpio)) { > > > + return dev_err_probe(dev, PTR_ERR(st->resetb_gpio), > > > + =C2=A0=C2=A0=C2=A0=C2=A0 "Failed to get RESET_B GPIO\n"); > > > + } >=20 > > > + st->shdn_gpio =3D devm_gpiod_get_optional(dev, "dac-shdn", GPIOD_OU= T_HIGH); > > > + if (IS_ERR(st->shdn_gpio)) { > > > + return dev_err_probe(dev, PTR_ERR(st->shdn_gpio), > > > + =C2=A0=C2=A0=C2=A0=C2=A0 "Failed to get SHDN GPIO\n"); > > > + } >=20 > The {} are not needed when the body is a single call. >=20 > ... >=20 > > > +static const struct of_device_id ad5706r_of_match[] =3D { > > > + { .compatible =3D "adi,ad5706r" }, > > > + { }, >=20 > See above about terminator entry style. >=20 > > > +};