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Mon, 11 Aug 2025 01:50:31 -0700 (PDT) Received: from mva-rohm ([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55b8898c158sm4214963e87.14.2025.08.11.01.50.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Aug 2025 01:50:30 -0700 (PDT) Date: Mon, 11 Aug 2025 11:50:27 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Nuno =?iso-8859-1?Q?S=E1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matti Vaittinen , Liam Girdwood , Mark Brown , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 01/11] iio: adc: ad7476: Simplify chip type detection Message-ID: <9e179bb3ba52303448ae4a559c1f011acd3f2fa6.1754901948.git.mazziesaccount@gmail.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="y7WQOdzmi8PUw1JG" Content-Disposition: inline In-Reply-To: --y7WQOdzmi8PUw1JG Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The ad7476 driver uses a table of structures for defining the IC variant specific data. Table is indexed using enum values, which are picked by SPI ID. Having the table and an enum adds extra complexity and may encourage adding IC specific quircks in the code, instead of centralizing the IC differences in one place, the chip-info. Simplify this by dropping the table and using individual structures for the IC specific data, and storing the IC specific structure's address directly in the SPI ID data. Finally, switch to the spi_get_device_match_data() and add a check for the return value. Signed-off-by: Matti Vaittinen Reviewed-by: Nuno S=C3=A1 Reviewed-by: Andy Shevchenko --- Revision history: v1 =3D> - No changes This patch was originally sent as an RFC in 2 patch series: https://lore.kernel.org/all/cover.1754041258.git.mazziesaccount@gmail.com/ Changes from the RFC =3D> v1: - Use spi_get_device_match_data() - Slightly reword commit message --- drivers/iio/adc/ad7476.c | 296 +++++++++++++++++++-------------------- 1 file changed, 146 insertions(+), 150 deletions(-) diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c index aea734aa06bd..9869526c1524 100644 --- a/drivers/iio/adc/ad7476.c +++ b/drivers/iio/adc/ad7476.c @@ -52,29 +52,6 @@ struct ad7476_state { unsigned char data[ALIGN(2, sizeof(s64)) + sizeof(s64)] __aligned(IIO_DMA= _MINALIGN); }; =20 -enum ad7476_supported_device_ids { - ID_AD7091, - ID_AD7091R, - ID_AD7273, - ID_AD7274, - ID_AD7276, - ID_AD7277, - ID_AD7278, - ID_AD7466, - ID_AD7467, - ID_AD7468, - ID_AD7475, - ID_AD7495, - ID_AD7940, - ID_ADC081S, - ID_ADC101S, - ID_ADC121S, - ID_ADS7866, - ID_ADS7867, - ID_ADS7868, - ID_LTC2314_14, -}; - static void ad7091_convst(struct ad7476_state *st) { if (!st->convst_gpio) @@ -190,102 +167,119 @@ static int ad7476_read_raw(struct iio_dev *indio_de= v, #define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \ BIT(IIO_CHAN_INFO_RAW)) =20 -static const struct ad7476_chip_info ad7476_chip_info_tbl[] =3D { - [ID_AD7091] =3D { - .channel[0] =3D AD7091R_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .convst_channel[0] =3D AD7091R_CONVST_CHAN(12), - .convst_channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .reset =3D ad7091_reset, - }, - [ID_AD7091R] =3D { - .channel[0] =3D AD7091R_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .convst_channel[0] =3D AD7091R_CONVST_CHAN(12), - .convst_channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .int_vref_uv =3D 2500000, - .has_vref =3D true, - .reset =3D ad7091_reset, - }, - [ID_AD7273] =3D { - .channel[0] =3D AD7940_CHAN(10), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .has_vref =3D true, - }, - [ID_AD7274] =3D { - .channel[0] =3D AD7940_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .has_vref =3D true, - }, - [ID_AD7276] =3D { - .channel[0] =3D AD7940_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7277] =3D { - .channel[0] =3D AD7940_CHAN(10), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7278] =3D { - .channel[0] =3D AD7940_CHAN(8), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7466] =3D { - .channel[0] =3D AD7476_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7467] =3D { - .channel[0] =3D AD7476_CHAN(10), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7468] =3D { - .channel[0] =3D AD7476_CHAN(8), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_AD7475] =3D { - .channel[0] =3D AD7476_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .has_vref =3D true, - .has_vdrive =3D true, - }, - [ID_AD7495] =3D { - .channel[0] =3D AD7476_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .int_vref_uv =3D 2500000, - .has_vdrive =3D true, - }, - [ID_AD7940] =3D { - .channel[0] =3D AD7940_CHAN(14), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADC081S] =3D { - .channel[0] =3D ADC081S_CHAN(8), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADC101S] =3D { - .channel[0] =3D ADC081S_CHAN(10), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADC121S] =3D { - .channel[0] =3D ADC081S_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADS7866] =3D { - .channel[0] =3D ADS786X_CHAN(12), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADS7867] =3D { - .channel[0] =3D ADS786X_CHAN(10), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_ADS7868] =3D { - .channel[0] =3D ADS786X_CHAN(8), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - }, - [ID_LTC2314_14] =3D { - .channel[0] =3D AD7940_CHAN(14), - .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), - .has_vref =3D true, - }, +static const struct ad7476_chip_info ad7091_chip_info =3D { + .channel[0] =3D AD7091R_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .convst_channel[0] =3D AD7091R_CONVST_CHAN(12), + .convst_channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .reset =3D ad7091_reset, +}; + +static const struct ad7476_chip_info ad7091r_chip_info =3D { + .channel[0] =3D AD7091R_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .convst_channel[0] =3D AD7091R_CONVST_CHAN(12), + .convst_channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .int_vref_uv =3D 2500000, + .has_vref =3D true, + .reset =3D ad7091_reset, +}; + +static const struct ad7476_chip_info ad7273_chip_info =3D { + .channel[0] =3D AD7940_CHAN(10), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref =3D true, +}; + +static const struct ad7476_chip_info ad7274_chip_info =3D { + .channel[0] =3D AD7940_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref =3D true, +}; + +static const struct ad7476_chip_info ad7276_chip_info =3D { + .channel[0] =3D AD7940_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7277_chip_info =3D { + .channel[0] =3D AD7940_CHAN(10), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7278_chip_info =3D { + .channel[0] =3D AD7940_CHAN(8), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7466_chip_info =3D { + .channel[0] =3D AD7476_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7467_chip_info =3D { + .channel[0] =3D AD7476_CHAN(10), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7468_chip_info =3D { + .channel[0] =3D AD7476_CHAN(8), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ad7475_chip_info =3D { + .channel[0] =3D AD7476_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref =3D true, + .has_vdrive =3D true, +}; + +static const struct ad7476_chip_info ad7495_chip_info =3D { + .channel[0] =3D AD7476_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .int_vref_uv =3D 2500000, + .has_vdrive =3D true, +}; + +static const struct ad7476_chip_info ad7940_chip_info =3D { + .channel[0] =3D AD7940_CHAN(14), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info adc081s_chip_info =3D { + .channel[0] =3D ADC081S_CHAN(8), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info adc101s_chip_info =3D { + .channel[0] =3D ADC081S_CHAN(10), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info adc121s_chip_info =3D { + .channel[0] =3D ADC081S_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ads7866_chip_info =3D { + .channel[0] =3D ADS786X_CHAN(12), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ads7867_chip_info =3D { + .channel[0] =3D ADS786X_CHAN(10), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ads7868_chip_info =3D { + .channel[0] =3D ADS786X_CHAN(8), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), +}; + +static const struct ad7476_chip_info ltc2314_14_chip_info =3D { + .channel[0] =3D AD7940_CHAN(14), + .channel[1] =3D IIO_CHAN_SOFT_TIMESTAMP(1), + .has_vref =3D true, }; =20 static const struct iio_info ad7476_info =3D { @@ -311,8 +305,10 @@ static int ad7476_probe(struct spi_device *spi) return -ENOMEM; =20 st =3D iio_priv(indio_dev); - st->chip_info =3D - &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + st->chip_info =3D spi_get_device_match_data(spi); + if (!st->chip_info) + return -ENODEV; =20 reg =3D devm_regulator_get(&spi->dev, "vcc"); if (IS_ERR(reg)) @@ -408,41 +404,41 @@ static int ad7476_probe(struct spi_device *spi) } =20 static const struct spi_device_id ad7476_id[] =3D { - { "ad7091", ID_AD7091 }, - { "ad7091r", ID_AD7091R }, - { "ad7273", ID_AD7273 }, - { "ad7274", ID_AD7274 }, - { "ad7276", ID_AD7276}, - { "ad7277", ID_AD7277 }, - { "ad7278", ID_AD7278 }, - { "ad7466", ID_AD7466 }, - { "ad7467", ID_AD7467 }, - { "ad7468", ID_AD7468 }, - { "ad7475", ID_AD7475 }, - { "ad7476", ID_AD7466 }, - { "ad7476a", ID_AD7466 }, - { "ad7477", ID_AD7467 }, - { "ad7477a", ID_AD7467 }, - { "ad7478", ID_AD7468 }, - { "ad7478a", ID_AD7468 }, - { "ad7495", ID_AD7495 }, - { "ad7910", ID_AD7467 }, - { "ad7920", ID_AD7466 }, - { "ad7940", ID_AD7940 }, - { "adc081s", ID_ADC081S }, - { "adc101s", ID_ADC101S }, - { "adc121s", ID_ADC121S }, - { "ads7866", ID_ADS7866 }, - { "ads7867", ID_ADS7867 }, - { "ads7868", ID_ADS7868 }, + { "ad7091", (kernel_ulong_t)&ad7091_chip_info }, + { "ad7091r", (kernel_ulong_t)&ad7091r_chip_info }, + { "ad7273", (kernel_ulong_t)&ad7273_chip_info }, + { "ad7274", (kernel_ulong_t)&ad7274_chip_info }, + { "ad7276", (kernel_ulong_t)&ad7276_chip_info }, + { "ad7277", (kernel_ulong_t)&ad7277_chip_info }, + { "ad7278", (kernel_ulong_t)&ad7278_chip_info }, + { "ad7466", (kernel_ulong_t)&ad7466_chip_info }, + { "ad7467", (kernel_ulong_t)&ad7467_chip_info }, + { "ad7468", (kernel_ulong_t)&ad7468_chip_info }, + { "ad7475", (kernel_ulong_t)&ad7475_chip_info }, + { "ad7476", (kernel_ulong_t)&ad7466_chip_info }, + { "ad7476a", (kernel_ulong_t)&ad7466_chip_info }, + { "ad7477", (kernel_ulong_t)&ad7467_chip_info }, + { "ad7477a", (kernel_ulong_t)&ad7467_chip_info }, + { "ad7478", (kernel_ulong_t)&ad7468_chip_info }, + { "ad7478a", (kernel_ulong_t)&ad7468_chip_info }, + { "ad7495", (kernel_ulong_t)&ad7495_chip_info }, + { "ad7910", (kernel_ulong_t)&ad7467_chip_info }, + { "ad7920", (kernel_ulong_t)&ad7466_chip_info }, + { "ad7940", (kernel_ulong_t)&ad7940_chip_info }, + { "adc081s", (kernel_ulong_t)&adc081s_chip_info }, + { "adc101s", (kernel_ulong_t)&adc101s_chip_info }, + { "adc121s", (kernel_ulong_t)&adc121s_chip_info }, + { "ads7866", (kernel_ulong_t)&ads7866_chip_info }, + { "ads7867", (kernel_ulong_t)&ads7867_chip_info }, + { "ads7868", (kernel_ulong_t)&ads7868_chip_info }, /* * The ROHM BU79100G is identical to the TI's ADS7866 from the software * point of view. The binding document mandates the ADS7866 to be * marked as a fallback for the BU79100G, but we still need the SPI ID * here to make the module loading work. */ - { "bu79100g", ID_ADS7866 }, - { "ltc2314-14", ID_LTC2314_14 }, + { "bu79100g", (kernel_ulong_t)&ads7866_chip_info }, + { "ltc2314-14", (kernel_ulong_t)<c2314_14_chip_info }, { } }; MODULE_DEVICE_TABLE(spi, ad7476_id); --=20 2.50.1 --y7WQOdzmi8PUw1JG Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEIx+f8wZb28fLKEhTeFA3/03aocUFAmiZrtIACgkQeFA3/03a ocUAXAgAyEIZ5+AJhmSWskio5AhkEsGBneEs5wYc9XOd181MVVi8rLK4YMz5vl/0 N12cuXUbmI1zSPYKyXrzBJmZcaH5OkGRkw9rP48zjAQ3ZK4CVafHR1J4HbrMCr33 97gjNBtQ8gmCLzUA3fIRRLuy9e+XvRV7XBKOfg/GKgq2rUHCnRe4yfnHER78UWZ7 HZxaN+JqaygZaMRTmQxK6uMpf95YyAd50NzfWM9jjhymoBsM7pYZzaX6ME33CgMU HX/HqQwyQeUJENLYPVbQ4JjIolfn1eziAzXOMNzd4gKf97HHDYC5EeEGWBGoiOeS 1CTr6eiWbJGmSCg4wb7R6tN7VgWFWA== =ZQ1Y -----END PGP SIGNATURE----- --y7WQOdzmi8PUw1JG--