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From: Olivier Moysan <olivier.moysan@foss.st.com>
To: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Olivier Moysan <olivier.moysan@foss.st.com>,
	<devicetree@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH v2 3/9] ARM: dts: stm32: add vrefint support to adc2 on stm32mp15
Date: Tue, 30 May 2023 14:45:31 +0200	[thread overview]
Message-ID: <20230530124538.621760-4-olivier.moysan@foss.st.com> (raw)
In-Reply-To: <20230530124538.621760-1-olivier.moysan@foss.st.com>

Set STM32 ADC2 as a consumer of BSEC on STM32MP15, to retrieve
vrefint calibration data saved in OTP.

During the calibration process vrefp is set to 3.3V and the data
acquired is saved to the OTP. This data is used by the ADC driver
to calculated the actual value of vrefp according to the formula:
vrefp = 3.3 x vrefint_cal / vrefint_data

The vrefint channel provides the actual value of vrefp,
which can be used to correct ADC acquisition data.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 3d0c39d847b5..61508917521c 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1113,6 +1113,8 @@ adc2: adc@100 {
 				interrupts = <1>;
 				dmas = <&dmamux1 10 0x400 0x01>;
 				dma-names = "rx";
+				nvmem-cells = <&vrefint>;
+				nvmem-cell-names = "vrefint";
 				status = "disabled";
 				channel@13 {
 					reg = <13>;
-- 
2.25.1


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WARNING: multiple messages have this Message-ID (diff)
From: Olivier Moysan <olivier.moysan@foss.st.com>
To: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Olivier Moysan <olivier.moysan@foss.st.com>,
	<devicetree@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH v2 3/9] ARM: dts: stm32: add vrefint support to adc2 on stm32mp15
Date: Tue, 30 May 2023 14:45:31 +0200	[thread overview]
Message-ID: <20230530124538.621760-4-olivier.moysan@foss.st.com> (raw)
In-Reply-To: <20230530124538.621760-1-olivier.moysan@foss.st.com>

Set STM32 ADC2 as a consumer of BSEC on STM32MP15, to retrieve
vrefint calibration data saved in OTP.

During the calibration process vrefp is set to 3.3V and the data
acquired is saved to the OTP. This data is used by the ADC driver
to calculated the actual value of vrefp according to the formula:
vrefp = 3.3 x vrefint_cal / vrefint_data

The vrefint channel provides the actual value of vrefp,
which can be used to correct ADC acquisition data.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 3d0c39d847b5..61508917521c 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1113,6 +1113,8 @@ adc2: adc@100 {
 				interrupts = <1>;
 				dmas = <&dmamux1 10 0x400 0x01>;
 				dma-names = "rx";
+				nvmem-cells = <&vrefint>;
+				nvmem-cell-names = "vrefint";
 				status = "disabled";
 				channel@13 {
 					reg = <13>;
-- 
2.25.1


  parent reply	other threads:[~2023-05-30 12:47 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-30 12:45 [PATCH v2 0/9] ARM: dts: stm32: add adc internal channels on stm32mp15 Olivier Moysan
2023-05-30 12:45 ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 1/9] ARM: dts: stm32: add adc internal channels to stm32mp15 Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 2/9] ARM: dts: stm32: add vrefint calibration on stm32mp15 Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` Olivier Moysan [this message]
2023-05-30 12:45   ` [PATCH v2 3/9] ARM: dts: stm32: add vrefint support to adc2 " Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 4/9] ARM: dts: stm32: enable adc on stm32mp15xx-dkx boards Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 5/9] ARM: dts: stm32: adopt generic iio bindings for adc channels on stm32mp157c-ed1 Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 6/9] ARM: dts: stm32: adopt generic iio bindings for adc channels on emstamp-argon Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 7/9] ARM: dts: stm32: adopt generic iio bindings for adc channels on dhcor-drc Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 8/9] ARM: dts: stm32: adopt generic iio bindings for adc channels on dhcor-testbench Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 12:45 ` [PATCH v2 9/9] ARM: dts: stm32: Update to generic ADC channel binding on DHSOM systems Olivier Moysan
2023-05-30 12:45   ` Olivier Moysan
2023-05-30 13:39 ` [PATCH v2 0/9] ARM: dts: stm32: add adc internal channels on stm32mp15 Marek Vasut
2023-05-30 13:39   ` Marek Vasut
2023-06-02 10:31 ` Alexandre TORGUE
2023-06-02 10:31   ` Alexandre TORGUE

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