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Tue, 12 Aug 2025 10:09:51 -0700 (PDT) Received: from [127.0.1.1] ([185.177.137.147]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-615a911451csm20060302a12.60.2025.08.12.10.09.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Aug 2025 10:09:50 -0700 (PDT) From: Yusuf Alper Bilgin Date: Tue, 12 Aug 2025 19:04:10 +0200 Subject: [PATCH 1/3] dt-bindings: iio: adc: ltc2497: add docs for LTC2495 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: quoted-printable Message-Id: <20250812-ltc2495-v1-1-7bf4c6feec2e@gmail.com> References: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> In-Reply-To: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Beguin Cc: Michael Hennerich , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yusuf Alper Bilgin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755018589; l=1305; i=y.alperbilgin@gmail.com; s=20250811; h=from:subject:message-id; bh=G572eJNgoJpmTVvUJKerp0FvfLuLpTaAhKYMi9ltLoQ=; b=qHbsY3RxEFr75c7F268oMHET9IYwSLu2IXfch6UAIYGYtauu1Yuy/N/L0a2kN5TOm5WLLIW30 8UIxGN0OCkBBrP+L9VXMJtjx5+t8xMLm48BCz54yJGM5+OwBJ7UMu1e X-Developer-Key: i=y.alperbilgin@gmail.com; a=ed25519; pk=FtW2oyQ0+xlYU0XmhYiJYC3lNPtPrgeE6i4WXPwaFnY= This updates the binding documentation for LTC2497 to include LTC2495. Signed-off-by: Yusuf Alper Bilgin --- Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml b/= Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml index 5cc6a96840778473895f436b7e2627d6240b254b..2a3e3dcc6ca7a48a0fccb88d8d4= 2fee34efcff73 100644 --- a/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml +++ b/Documentation/devicetree/bindings/iio/adc/lltc,ltc2497.yaml @@ -17,11 +17,13 @@ description: | =20 https://www.analog.com/media/en/technical-documentation/data-sheets/23= 09fd.pdf =20 + LTC2495: LTC2497: LTC2499: 16bit ADC supporting up to 16 single ended or 8 differential inputs. I2C interface. =20 + https://www.analog.com/media/en/technical-documentation/data-sheets/24= 95fe.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/24= 97fb.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/24= 99fe.pdf =20 @@ -29,6 +31,7 @@ properties: compatible: enum: - lltc,ltc2309 + - lltc,ltc2495 - lltc,ltc2497 - lltc,ltc2499 =20 --=20 2.43.0 From nobody Sat Oct 4 20:59:05 2025 Received: from mail-ed1-f41.google.com (mail-ed1-f41.google.com [209.85.208.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A17082FD1B6; Tue, 12 Aug 2025 17:09:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755018596; cv=none; b=E5T9dYd9eIoF84rpw7WE7ysh2hjkyOds4DfC/9pWNYHG6wi6OiHaXPg0w/FFl7+05thE9lvp/j7vhIuofEGJTFyJyVKeGFnqeD2J9kpavb/RPeih6SbG+nz7TFJDI/ao4hu4Oeah5/YHpLFa8J9YUABynwxg+TaYOLMPHRnD3V8= ARC-Message-Signature: i=1; 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Tue, 12 Aug 2025 10:09:52 -0700 (PDT) Received: from [127.0.1.1] ([185.177.137.147]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-615a911451csm20060302a12.60.2025.08.12.10.09.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Aug 2025 10:09:51 -0700 (PDT) From: Yusuf Alper Bilgin Date: Tue, 12 Aug 2025 19:04:11 +0200 Subject: [PATCH 2/3] iio: adc: ltc2497: add support for LTC2495 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: quoted-printable Message-Id: <20250812-ltc2495-v1-2-7bf4c6feec2e@gmail.com> References: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> In-Reply-To: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Beguin Cc: Michael Hennerich , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yusuf Alper Bilgin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755018589; l=3693; i=y.alperbilgin@gmail.com; s=20250811; h=from:subject:message-id; bh=IqcVlKobCq588xENs4uppJQybncqhnqWvF/okPMFi9Q=; b=KIX6i3ugIuT8joLUld2oEZkkMM9KrjCJWhezNctQLLeR2KHki4TtxAOef/tBch6Cu+9utw+mh NFiarAIBkNQAeknK+jXobaGm3qXIBGlbnKv5+nHmTWv8YDPSKbEYgJY X-Developer-Key: i=y.alperbilgin@gmail.com; a=ed25519; pk=FtW2oyQ0+xlYU0XmhYiJYC3lNPtPrgeE6i4WXPwaFnY= This updates the LTC2497 driver to also support the LTC2495. Signed-off-by: Yusuf Alper Bilgin --- drivers/iio/adc/ltc2497-core.c | 20 +++++++++----------- drivers/iio/adc/ltc2497.c | 7 +++++++ drivers/iio/adc/ltc2497.h | 4 +--- 3 files changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c index 2dc5c704426949a4ec62c42591d6c2c40ffb79cc..400f4fe5af30e8e16b755067262= 35f10f2a4237f 100644 --- a/drivers/iio/adc/ltc2497-core.c +++ b/drivers/iio/adc/ltc2497-core.c @@ -15,9 +15,12 @@ =20 #include "ltc2497.h" =20 -#define LTC2497_SGL BIT(4) -#define LTC2497_DIFF 0 -#define LTC2497_SIGN BIT(3) +#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE +#define LTC2497_CONVERSION_TIME_MS 150ULL + +#define LTC2497_SGL BIT(4) +#define LTC2497_DIFF 0 +#define LTC2497_SIGN BIT(3) =20 static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata) { @@ -26,20 +29,15 @@ static int ltc2497core_wait_conv(struct ltc2497core_dri= verdata *ddata) time_elapsed =3D ktime_ms_delta(ktime_get(), ddata->time_prev); =20 if (time_elapsed < LTC2497_CONVERSION_TIME_MS) { - /* delay if conversion time not passed - * since last read or write - */ - if (msleep_interruptible( - LTC2497_CONVERSION_TIME_MS - time_elapsed)) + /* delay if conversion time not passed since last read or write */ + if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS - time_elapsed)) return -ERESTARTSYS; =20 return 0; } =20 if (time_elapsed - LTC2497_CONVERSION_TIME_MS <=3D 0) { - /* We're in automatic mode - - * so the last reading is still not outdated - */ + /* We're in automatic mode - so the last reading is still not outdated */ return 0; } =20 diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index eb9d521e86e54def0493ea0e81f63b37900c56a5..8f4665547b5b0d32084599f8557= c40102c37a4ce 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -19,6 +19,7 @@ #include "ltc2497.h" =20 enum ltc2497_chip_type { + TYPE_LTC2495, TYPE_LTC2497, TYPE_LTC2499, }; @@ -131,6 +132,10 @@ static void ltc2497_remove(struct i2c_client *client) } =20 static const struct ltc2497_chip_info ltc2497_info[] =3D { + [TYPE_LTC2495] =3D { + .resolution =3D 16, + .name =3D "ltc2495", + }, [TYPE_LTC2497] =3D { .resolution =3D 16, .name =3D NULL, @@ -142,6 +147,7 @@ static const struct ltc2497_chip_info ltc2497_info[] = =3D { }; =20 static const struct i2c_device_id ltc2497_id[] =3D { + { "ltc2495", (kernel_ulong_t)<c2497_info[TYPE_LTC2495] }, { "ltc2497", (kernel_ulong_t)<c2497_info[TYPE_LTC2497] }, { "ltc2499", (kernel_ulong_t)<c2497_info[TYPE_LTC2499] }, { } @@ -149,6 +155,7 @@ static const struct i2c_device_id ltc2497_id[] =3D { MODULE_DEVICE_TABLE(i2c, ltc2497_id); =20 static const struct of_device_id ltc2497_of_match[] =3D { + { .compatible =3D "lltc,ltc2495", .data =3D <c2497_info[TYPE_LTC2495] }, { .compatible =3D "lltc,ltc2497", .data =3D <c2497_info[TYPE_LTC2497] }, { .compatible =3D "lltc,ltc2499", .data =3D <c2497_info[TYPE_LTC2499] }, { } diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h index 64e81c95a3dd05911b6717c09ac0560c9f47f304..f2139f260c3fe4e8772c6db9c46= 331de775dcd5c 100644 --- a/drivers/iio/adc/ltc2497.h +++ b/drivers/iio/adc/ltc2497.h @@ -1,8 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0-only */ =20 -#define LTC2497_ENABLE 0xA0 -#define LTC2497_CONFIG_DEFAULT LTC2497_ENABLE -#define LTC2497_CONVERSION_TIME_MS 150ULL +#define LTC2497_ENABLE 0xA0 =20 struct ltc2497_chip_info { u32 resolution; 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Tue, 12 Aug 2025 10:09:54 -0700 (PDT) Received: from [127.0.1.1] ([185.177.137.147]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-615a911451csm20060302a12.60.2025.08.12.10.09.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Aug 2025 10:09:52 -0700 (PDT) From: Yusuf Alper Bilgin Date: Tue, 12 Aug 2025 19:04:12 +0200 Subject: [PATCH 3/3] iio: adc: ltc2497: add temperature sensor 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: quoted-printable Message-Id: <20250812-ltc2495-v1-3-7bf4c6feec2e@gmail.com> References: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> In-Reply-To: <20250812-ltc2495-v1-0-7bf4c6feec2e@gmail.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Beguin Cc: Michael Hennerich , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yusuf Alper Bilgin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755018589; l=7778; i=y.alperbilgin@gmail.com; s=20250811; h=from:subject:message-id; bh=iyO00up7pExqdt6wTiA/2z0XMeAgUS+X5mkIQF9F00g=; b=CEJMp9UmnXizijTG5R6lE4pMOZZDU4w86PgVlCb97SQyPX+nqq5AczOzcXw5uSMRRR6P7IP/u fX7SCHPpgBsARYLgJgdCXiDGCCiRHhjlu/8s4cZ8gSbtzpaAhEID2J/ X-Developer-Key: i=y.alperbilgin@gmail.com; a=ed25519; pk=FtW2oyQ0+xlYU0XmhYiJYC3lNPtPrgeE6i4WXPwaFnY= The LTC2495 and LTC2499 include an internal temperature sensor. This patch adds support for reading it via a standard IIO temperature channel. Signed-off-by: Yusuf Alper Bilgin --- drivers/iio/adc/ltc2496.c | 1 + drivers/iio/adc/ltc2497-core.c | 80 ++++++++++++++++++++++++++++++++++++++= ---- drivers/iio/adc/ltc2497.c | 33 ++++++++++++++--- drivers/iio/adc/ltc2497.h | 7 +++- 4 files changed, 109 insertions(+), 12 deletions(-) diff --git a/drivers/iio/adc/ltc2496.c b/drivers/iio/adc/ltc2496.c index f06dd0b9a85819935abea6496abe2a808ac549c6..909dbd5f9aee877aafe423b4758= 1ff4f36a76c52 100644 --- a/drivers/iio/adc/ltc2496.c +++ b/drivers/iio/adc/ltc2496.c @@ -90,6 +90,7 @@ static void ltc2496_remove(struct spi_device *spi) static const struct ltc2497_chip_info ltc2496_info =3D { .resolution =3D 16, .name =3D NULL, + .has_temp_channel =3D false, }; =20 static const struct of_device_id ltc2496_of_match[] =3D { diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c index 400f4fe5af30e8e16b75506726235f10f2a4237f..938259df4d27e9e26dea2be4112= bef355adaaafb 100644 --- a/drivers/iio/adc/ltc2497-core.c +++ b/drivers/iio/adc/ltc2497-core.c @@ -72,8 +72,8 @@ static int ltc2497core_read(struct ltc2497core_driverdata= *ddata, u8 address, in } =20 static int ltc2497core_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, int *val2, long mask) + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) { struct ltc2497core_driverdata *ddata =3D iio_priv(indio_dev); int ret; @@ -93,10 +93,52 @@ static int ltc2497core_read_raw(struct iio_dev *indio_d= ev, if (ret < 0) return ret; =20 - *val =3D ret / 1000; - *val2 =3D ddata->chip_info->resolution + 1; + switch (chan->type) { + case IIO_VOLTAGE: + *val =3D ret / 1000; + *val2 =3D ddata->chip_info->resolution + 1; + + return IIO_VAL_FRACTIONAL_LOG2; + + case IIO_TEMP: + if (!ddata->chip_info->has_temp_channel) + return -EINVAL; + + /* + * The datasheet formula to get Temperature in Celsius is: + * Temp_C =3D (Conversion * Vref / temp_scale) - 273 + * + * To match the IIO framework's model of (raw + offset) * scale, + * and to get the final result in millidegrees Celsius: + * + * =3D ((Conversion * Vref / temp_scale) - 273) * 1000 + * =3D (Conversion - (273 * temp_scale / Vref)) * 1000 * Vref / temp_sc= ale + * + * This gives us if the Vref is in mV: + * scale =3D Vref * 1000 / temp_scale + * offset =3D -273 * temp_scale / Vref + */ + *val =3D ret; + *val2 =3D ddata->chip_info->temp_scale; + + return IIO_VAL_FRACTIONAL; + + default: + return -EINVAL; + } + case IIO_CHAN_INFO_OFFSET: + if (chan->type !=3D IIO_TEMP) + return -EINVAL; + + /* see the calculation above. Offset with (-273 * temp_scale / Vref) */ + ret =3D regulator_get_voltage(ddata->ref); + if (ret < 0) + return ret; =20 - return IIO_VAL_FRACTIONAL_LOG2; + *val =3D -273 * ddata->chip_info->temp_scale; + *val2 =3D ret / 1000; + + return IIO_VAL_FRACTIONAL; =20 default: return -EINVAL; @@ -124,6 +166,14 @@ static int ltc2497core_read_raw(struct iio_dev *indio_= dev, .differential =3D 1, \ } =20 +#define LTC2497_T_CHAN() { \ + .type =3D IIO_TEMP, \ + .channel =3D 0, \ + .address =3D (LTC2497_TEMP_CMD_ADDR), \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INF= O_OFFSET), \ +} + static const struct iio_chan_spec ltc2497core_channel[] =3D { LTC2497_CHAN(0, LTC2497_SGL, "CH0"), LTC2497_CHAN(1, LTC2497_SGL, "CH1"), @@ -159,6 +209,8 @@ static const struct iio_chan_spec ltc2497core_channel[]= =3D { LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN), }; =20 +static const struct iio_chan_spec ltc2497_temp_channel =3D LTC2497_T_CHAN(= ); + static const struct iio_info ltc2497core_info =3D { .read_raw =3D ltc2497core_read_raw, }; @@ -180,8 +232,22 @@ int ltc2497core_probe(struct device *dev, struct iio_d= ev *indio_dev) =20 indio_dev->info =3D <c2497core_info; indio_dev->modes =3D INDIO_DIRECT_MODE; - indio_dev->channels =3D ltc2497core_channel; - indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel); + + /* Dynamically create the channel list */ + if (ddata->chip_info->has_temp_channel) { + /* Allocate space for common channels + 1 temp channel */ + indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel) + 1; + indio_dev->channels =3D devm_kmemdup(dev, ltc2497core_channel, + sizeof(ltc2497core_channel), GFP_KERNEL); + if (!indio_dev->channels) + return -ENOMEM; + + memcpy((void *)&indio_dev->channels[ARRAY_SIZE(ltc2497core_channel)], + <c2497_temp_channel, sizeof(ltc2497_temp_channel)); + } else { + indio_dev->channels =3D ltc2497core_channel; + indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel); + } =20 ret =3D ddata->result_and_measure(ddata, LTC2497_CONFIG_DEFAULT, NULL); if (ret < 0) diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index 8f4665547b5b0d32084599f8557c40102c37a4ce..3f8515ef465d3fda7572d63ef3a= 265dec89079ea 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -86,11 +86,31 @@ static int ltc2497_result_and_measure(struct ltc2497cor= e_driverdata *ddata, return 0; } =20 - ret =3D i2c_smbus_write_byte(st->client, - LTC2497_ENABLE | address); + /* + * Chips with temperature sensor support (e.g., LTC2495/LTC2499) + * require a two-byte command format to select any channel. + * + * To read the internal temperature, LTC2497_TEMP_CMD_ADDR is sent as + * the second byte. To read a voltage channel, LTC2497_EN2 is sent, + * which sets the default configuration: simultaneous 50/60Hz + * rejection, 1x speed, and gain=3D1. + * + * Chips without this feature use a standard single-byte command. + */ + if (ddata->chip_info->has_temp_channel) { + if (address =3D=3D LTC2497_TEMP_CMD_ADDR) + ret =3D i2c_smbus_write_byte_data(st->client, LTC2497_ENABLE, + LTC2497_TEMP_CMD_ADDR); + else + ret =3D i2c_smbus_write_byte_data(st->client, LTC2497_ENABLE | address, + LTC2497_EN2); + + } else { + ret =3D i2c_smbus_write_byte(st->client, LTC2497_ENABLE | address); + } + if (ret) - dev_err(&st->client->dev, "i2c transfer failed: %pe\n", - ERR_PTR(ret)); + dev_err(&st->client->dev, "i2c transfer failed: %pe\n", ERR_PTR(ret)); return ret; } =20 @@ -135,14 +155,19 @@ static const struct ltc2497_chip_info ltc2497_info[] = =3D { [TYPE_LTC2495] =3D { .resolution =3D 16, .name =3D "ltc2495", + .has_temp_channel =3D true, + .temp_scale =3D 12250, /* 12.250 V per degree C -> 12250 mV */ }, [TYPE_LTC2497] =3D { .resolution =3D 16, .name =3D NULL, + .has_temp_channel =3D false, }, [TYPE_LTC2499] =3D { .resolution =3D 24, .name =3D "ltc2499", + .has_temp_channel =3D true, + .temp_scale =3D 1570000, /* 1570 V per degree C -> 1570000 mV */ }, }; =20 diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h index f2139f260c3fe4e8772c6db9c46331de775dcd5c..c133a4fb8092b1c6a66a7336016= dd361783f531c 100644 --- a/drivers/iio/adc/ltc2497.h +++ b/drivers/iio/adc/ltc2497.h @@ -1,10 +1,15 @@ /* SPDX-License-Identifier: GPL-2.0-only */ =20 -#define LTC2497_ENABLE 0xA0 +#define LTC2497_ENABLE 0xA0 +#define LTC2497_EN2 0x80 +#define LTC2497_IM 0x40 +#define LTC2497_TEMP_CMD_ADDR (LTC2497_EN2 | LTC2497_IM) =20 struct ltc2497_chip_info { u32 resolution; const char *name; + bool has_temp_channel; + u32 temp_scale; /* in mV, for temp conversion */ }; =20 struct ltc2497core_driverdata { --=20 2.43.0