[PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[Rob Herring (Arm)]

"lm75" without any vendor is undocumented. It works with the Linux
kernel since the I2C subsystem will do matches of the compatible string
without a vendor prefix to the i2c_device_id and/or driver name.

Mostly replace "lm75" with "national,lm75" as that's the original part
vendor and the compatible which matches what "lm75" matched with. In a
couple of cases the node name or compatible gives a clue to the actual
part and vendor and a more specific compatible can be used. In these
cases, it does change the variant the kernel picks.

"nct75" is an OnSemi part which is compatible with TI TMP75C based on
a comparison of the OnSemi NCT75 datasheet and configuration the Linux
driver uses. Adding an OnSemi compatible would be an ABI change.

"nxp,lm75" is most likely an NXP part. NXP makes a LM75A and LM75B.
Both are 11-bit resolution and 100ms sample time, so "national,lm75b" is
the closest match.

While we're here, fix the node names to use the generic name
"temperature-sensor".

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
---
SoC maintainers, Please take this directly.
---
 .../aspeed/aspeed-bmc-facebook-greatlakes.dts |  2 +-
 .../socfpga/socfpga_cyclone5_vining_fpga.dts  |  4 +--
 .../dts/marvell/armada-385-clearfog-gtr.dtsi  |  8 ++---
 .../boot/dts/nuvoton/nuvoton-npcm730-kudo.dts | 32 +++++++++----------
 .../boot/dts/nuvoton/nuvoton-npcm750-evb.dts  |  6 ++--
 arch/arm/boot/dts/nxp/imx/imx53-mba53.dts     |  4 +--
 arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi   |  4 +--
 .../dts/nxp/lpc/lpc4357-ea4357-devkit.dts     |  4 +--
 .../boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts  |  2 +-
 arch/arm/boot/dts/ti/omap/am335x-nano.dts     |  2 +-
 .../boot/dts/xilinx/zynq-zturn-common.dtsi    |  4 +--
 11 files changed, 36 insertions(+), 36 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-greatlakes.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-greatlakes.dts
index 998598c15fd0..49914a4a179f 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-greatlakes.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-greatlakes.dts
@@ -201,7 +201,7 @@ eeprom@54 {
 &i2c12 {
 	status = "okay";
 	temperature-sensor@4f {
-		compatible = "lm75";
+		compatible = "national,lm75";
 		reg = <0x4f>;
 	};
 };
diff --git a/arch/arm/boot/dts/intel/socfpga/socfpga_cyclone5_vining_fpga.dts b/arch/arm/boot/dts/intel/socfpga/socfpga_cyclone5_vining_fpga.dts
index 65f390bf8975..84f39dec3c42 100644
--- a/arch/arm/boot/dts/intel/socfpga/socfpga_cyclone5_vining_fpga.dts
+++ b/arch/arm/boot/dts/intel/socfpga/socfpga_cyclone5_vining_fpga.dts
@@ -130,8 +130,8 @@ gpio: pca9557@1f {
 		#gpio-cells = <2>;
 	};
 
-	temp: lm75@48 {
-		compatible = "lm75";
+	temp: temperature-sensor@48 {
+		compatible = "national,lm75";
 		reg = <0x48>;
 	};
 
diff --git a/arch/arm/boot/dts/marvell/armada-385-clearfog-gtr.dtsi b/arch/arm/boot/dts/marvell/armada-385-clearfog-gtr.dtsi
index f3a3cb6ac311..8208c6a9627a 100644
--- a/arch/arm/boot/dts/marvell/armada-385-clearfog-gtr.dtsi
+++ b/arch/arm/boot/dts/marvell/armada-385-clearfog-gtr.dtsi
@@ -423,14 +423,14 @@ &i2c0 {
 	status = "okay";
 
 	/* U26 temperature sensor placed near SoC */
-	temp1: nct75@4c {
-		compatible = "lm75";
+	temp1: temperature-sensor@4c {
+		compatible = "ti,tmp75c";
 		reg = <0x4c>;
 	};
 
 	/* U27 temperature sensor placed near RTC battery */
-	temp2: nct75@4d {
-		compatible = "lm75";
+	temp2: temperature-sensor@4d {
+		compatible = "ti,tmp75c";
 		reg = <0x4d>;
 	};
 
diff --git a/arch/arm/boot/dts/nuvoton/nuvoton-npcm730-kudo.dts b/arch/arm/boot/dts/nuvoton/nuvoton-npcm730-kudo.dts
index 1f07ba382910..886a87dfcd0d 100644
--- a/arch/arm/boot/dts/nuvoton/nuvoton-npcm730-kudo.dts
+++ b/arch/arm/boot/dts/nuvoton/nuvoton-npcm730-kudo.dts
@@ -531,8 +531,8 @@ i2c@4 {
 			reg = <4>;
 
 			// INLET1_T
-			lm75@5c {
-				compatible = "ti,lm75";
+			temperature-sensor@5c {
+				compatible = "national,lm75";
 				reg = <0x5c>;
 			};
 		};
@@ -543,8 +543,8 @@ i2c@5 {
 			reg = <5>;
 
 			// OUTLET1_T
-			lm75@5c {
-				compatible = "ti,lm75";
+			temperature-sensor@5c {
+				compatible = "national,lm75";
 				reg = <0x5c>;
 			};
 		};
@@ -555,8 +555,8 @@ i2c@6 {
 			reg = <6>;
 
 			// OUTLET2_T
-			lm75@5c {
-				compatible = "ti,lm75";
+			temperature-sensor@5c {
+				compatible = "national,lm75";
 				reg = <0x5c>;
 			};
 		};
@@ -567,8 +567,8 @@ i2c@7 {
 			reg = <7>;
 
 			// OUTLET3_T
-			lm75@5c {
-				compatible = "ti,lm75";
+			temperature-sensor@5c {
+				compatible = "national,lm75";
 				reg = <0x5c>;
 			};
 		};
@@ -697,8 +697,8 @@ i2c@3 {
 			reg = <3>;
 
 			// M2_ZONE_T
-			lm75@28 {
-				compatible = "ti,lm75";
+			temperature-sensor@28 {
+				compatible = "national,lm75";
 				reg = <0x28>;
 			};
 		};
@@ -709,8 +709,8 @@ i2c@4 {
 			reg = <4>;
 
 			// BATT_ZONE_T
-			lm75@29 {
-				compatible = "ti,lm75";
+			temperature-sensor@29 {
+				compatible = "national,lm75";
 				reg = <0x29>;
 			};
 		};
@@ -721,8 +721,8 @@ i2c@5 {
 			reg = <5>;
 
 			// NBM1_ZONE_T
-			lm75@28 {
-				compatible = "ti,lm75";
+			temperature-sensor@28 {
+				compatible = "national,lm75";
 				reg = <0x28>;
 			};
 		};
@@ -732,8 +732,8 @@ i2c@6 {
 			reg = <6>;
 
 			// NBM2_ZONE_T
-			lm75@29 {
-				compatible = "ti,lm75";
+			temperature-sensor@29 {
+				compatible = "national,lm75";
 				reg = <0x29>;
 			};
 		};
diff --git a/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dts b/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dts
index f53d45fa1de8..bcdcb30c7bf6 100644
--- a/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dts
+++ b/arch/arm/boot/dts/nuvoton/nuvoton-npcm750-evb.dts
@@ -198,7 +198,7 @@ &i2c0 {
 	clock-frequency = <100000>;
 	status = "okay";
 	lm75@48 {
-		compatible = "lm75";
+		compatible = "national,lm75";
 		reg = <0x48>;
 		status = "okay";
 	};
@@ -208,8 +208,8 @@ lm75@48 {
 &i2c1 {
 	clock-frequency = <100000>;
 	status = "okay";
-	lm75@48 {
-		compatible = "lm75";
+	temperature-sensor@48 {
+		compatible = "national,lm75";
 		reg = <0x48>;
 		status = "okay";
 	};
diff --git a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
index 2117de872703..d155b3ec22ef 100644
--- a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
@@ -175,8 +175,8 @@ expander: pca9554@20 {
 		gpio-controller;
 	};
 
-	sensor2: lm75@49 {
-		compatible = "lm75";
+	sensor2: temperature-sensor@49 {
+		compatible = "national,lm75";
 		reg = <0x49>;
 	};
 };
diff --git a/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi b/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
index b2d7271d1d24..d01c3aee0272 100644
--- a/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
@@ -254,8 +254,8 @@ pmic: mc34708@8 {
 		interrupts = <6 4>; /* PATA_DATA6, active high */
 	};
 
-	sensor1: lm75@48 {
-		compatible = "lm75";
+	sensor1: temperature-sensor@48 {
+		compatible = "national,lm75";
 		reg = <0x48>;
 	};
 
diff --git a/arch/arm/boot/dts/nxp/lpc/lpc4357-ea4357-devkit.dts b/arch/arm/boot/dts/nxp/lpc/lpc4357-ea4357-devkit.dts
index 224f80a4a31d..4aefbc01dfc0 100644
--- a/arch/arm/boot/dts/nxp/lpc/lpc4357-ea4357-devkit.dts
+++ b/arch/arm/boot/dts/nxp/lpc/lpc4357-ea4357-devkit.dts
@@ -482,8 +482,8 @@ mma7455@1d {
 		reg = <0x1d>;
 	};
 
-	lm75@48 {
-		compatible = "nxp,lm75";
+	temperature-sensor@48 {
+		compatible = "national,lm75b";
 		reg = <0x48>;
 	};
 
diff --git a/arch/arm/boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts b/arch/arm/boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts
index 1f84654df50c..846afb8ccbf1 100644
--- a/arch/arm/boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts
+++ b/arch/arm/boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts
@@ -511,7 +511,7 @@ &i2c1 {
 	clock-frequency = <400000>;
 
 	sensor@49 {
-		compatible = "lm75";
+		compatible = "national,lm75";
 		reg = <0x49>;
 	};
 
diff --git a/arch/arm/boot/dts/ti/omap/am335x-nano.dts b/arch/arm/boot/dts/ti/omap/am335x-nano.dts
index 26b5510cb3d1..56929059f5af 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-nano.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-nano.dts
@@ -231,7 +231,7 @@ tps: tps@24 {
 	};
 
 	temperature-sensor@48 {
-		compatible = "lm75";
+		compatible = "national,lm75";
 		reg = <0x48>;
 	};
 
diff --git a/arch/arm/boot/dts/xilinx/zynq-zturn-common.dtsi b/arch/arm/boot/dts/xilinx/zynq-zturn-common.dtsi
index dfb1fbafe3aa..33b02e05ce82 100644
--- a/arch/arm/boot/dts/xilinx/zynq-zturn-common.dtsi
+++ b/arch/arm/boot/dts/xilinx/zynq-zturn-common.dtsi
@@ -97,9 +97,9 @@ &i2c0 {
 	status = "okay";
 	clock-frequency = <400000>;
 
-	stlm75@49 {
+	temperature-sensor@49 {
 		status = "okay";
-		compatible = "lm75";
+		compatible = "st,stlm75";
 		reg = <0x49>;
 	};
 
-- 
2.43.0

Re: [PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[Krzysztof Kozlowski]

On 08/08/2024 18:49, Rob Herring (Arm) wrote:
> "lm75" without any vendor is undocumented. It works with the Linux
> kernel since the I2C subsystem will do matches of the compatible string
> without a vendor prefix to the i2c_device_id and/or driver name.
> 
> Mostly replace "lm75" with "national,lm75" as that's the original part
> vendor and the compatible which matches what "lm75" matched with. In a
> couple of cases the node name or compatible gives a clue to the actual
> part and vendor and a more specific compatible can be used. In these
> cases, it does change the variant the kernel picks.
> 
> "nct75" is an OnSemi part which is compatible with TI TMP75C based on
> a comparison of the OnSemi NCT75 datasheet and configuration the Linux
> driver uses. Adding an OnSemi compatible would be an ABI change.
> 
> "nxp,lm75" is most likely an NXP part. NXP makes a LM75A and LM75B.
> Both are 11-bit resolution and 100ms sample time, so "national,lm75b" is
> the closest match.
> 
> While we're here, fix the node names to use the generic name
> "temperature-sensor".
> 
> Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
> ---
> SoC maintainers, Please take this directly.
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

Re: [PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[Kevin Hilman]

"Rob Herring (Arm)" <robh@kernel.org> writes:

> "lm75" without any vendor is undocumented. It works with the Linux
> kernel since the I2C subsystem will do matches of the compatible string
> without a vendor prefix to the i2c_device_id and/or driver name.
>
> Mostly replace "lm75" with "national,lm75" as that's the original part
> vendor and the compatible which matches what "lm75" matched with. In a
> couple of cases the node name or compatible gives a clue to the actual
> part and vendor and a more specific compatible can be used. In these
> cases, it does change the variant the kernel picks.
>
> "nct75" is an OnSemi part which is compatible with TI TMP75C based on
> a comparison of the OnSemi NCT75 datasheet and configuration the Linux
> driver uses. Adding an OnSemi compatible would be an ABI change.
>
> "nxp,lm75" is most likely an NXP part. NXP makes a LM75A and LM75B.
> Both are 11-bit resolution and 100ms sample time, so "national,lm75b" is
> the closest match.
>
> While we're here, fix the node names to use the generic name
> "temperature-sensor".
>
> Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
> ---
> SoC maintainers, Please take this directly.

[...]

>  arch/arm/boot/dts/ti/omap/am335x-nano.dts     |  2 +-

For this one...

Reviewed-by: Kevin Hilman <khilman@baylibre.com>

Re: [PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[Alexander Stein]

Am Donnerstag, 8. August 2024, 18:49:38 CEST schrieb Rob Herring (Arm):
> "lm75" without any vendor is undocumented. It works with the Linux
> kernel since the I2C subsystem will do matches of the compatible string
> without a vendor prefix to the i2c_device_id and/or driver name.
> 
> Mostly replace "lm75" with "national,lm75" as that's the original part
> vendor and the compatible which matches what "lm75" matched with. In a
> couple of cases the node name or compatible gives a clue to the actual
> part and vendor and a more specific compatible can be used. In these
> cases, it does change the variant the kernel picks.
> 
> "nct75" is an OnSemi part which is compatible with TI TMP75C based on
> a comparison of the OnSemi NCT75 datasheet and configuration the Linux
> driver uses. Adding an OnSemi compatible would be an ABI change.
> 
> "nxp,lm75" is most likely an NXP part. NXP makes a LM75A and LM75B.
> Both are 11-bit resolution and 100ms sample time, so "national,lm75b" is
> the closest match.
> 
> While we're here, fix the node names to use the generic name
> "temperature-sensor".
> 
> Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
> ---
> SoC maintainers, Please take this directly.
> ---
>  .../aspeed/aspeed-bmc-facebook-greatlakes.dts |  2 +-
>  .../socfpga/socfpga_cyclone5_vining_fpga.dts  |  4 +--
>  .../dts/marvell/armada-385-clearfog-gtr.dtsi  |  8 ++---
>  .../boot/dts/nuvoton/nuvoton-npcm730-kudo.dts | 32 +++++++++----------
>  .../boot/dts/nuvoton/nuvoton-npcm750-evb.dts  |  6 ++--
>  arch/arm/boot/dts/nxp/imx/imx53-mba53.dts     |  4 +--
>  arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi   |  4 +--
>  .../dts/nxp/lpc/lpc4357-ea4357-devkit.dts     |  4 +--
>  .../boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts  |  2 +-
>  arch/arm/boot/dts/ti/omap/am335x-nano.dts     |  2 +-
>  .../boot/dts/xilinx/zynq-zturn-common.dtsi    |  4 +--
>  11 files changed, 36 insertions(+), 36 deletions(-)
> 
< [snip]
> diff --git a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> index 2117de872703..d155b3ec22ef 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> +++ b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> @@ -175,8 +175,8 @@ expander: pca9554@20 {
>  		gpio-controller;
>  	};
>  
> -	sensor2: lm75@49 {
> -		compatible = "lm75";
> +	sensor2: temperature-sensor@49 {
> +		compatible = "national,lm75";

I checked the old schematics. This is an NXP LM75A, so 'national,lm75a'
would be the correct compatible.

>  		reg = <0x49>;
>  	};
>  };
> diff --git a/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi b/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
> index b2d7271d1d24..d01c3aee0272 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
> +++ b/arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi
> @@ -254,8 +254,8 @@ pmic: mc34708@8 {
>  		interrupts = <6 4>; /* PATA_DATA6, active high */
>  	};
>  
> -	sensor1: lm75@48 {
> -		compatible = "lm75";
> +	sensor1: temperature-sensor@48 {
> +		compatible = "national,lm75";

I checked the old schematics. This is an NXP LM75A, so 'national,lm75a'
would be the correct compatible.

Best regards,
Alexander

>  		reg = <0x48>;
>  	};
>  
> [snip]


-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
http://www.tq-group.com/

Re: [PATCH] ARM: dts: Fix undocumented LM75 compatible nodes

[Rob Herring]

On Fri, Aug 9, 2024 at 1:51 AM Alexander Stein
<alexander.stein@ew.tq-group.com> wrote:
>
> Am Donnerstag, 8. August 2024, 18:49:38 CEST schrieb Rob Herring (Arm):
> > "lm75" without any vendor is undocumented. It works with the Linux
> > kernel since the I2C subsystem will do matches of the compatible string
> > without a vendor prefix to the i2c_device_id and/or driver name.
> >
> > Mostly replace "lm75" with "national,lm75" as that's the original part
> > vendor and the compatible which matches what "lm75" matched with. In a
> > couple of cases the node name or compatible gives a clue to the actual
> > part and vendor and a more specific compatible can be used. In these
> > cases, it does change the variant the kernel picks.
> >
> > "nct75" is an OnSemi part which is compatible with TI TMP75C based on
> > a comparison of the OnSemi NCT75 datasheet and configuration the Linux
> > driver uses. Adding an OnSemi compatible would be an ABI change.
> >
> > "nxp,lm75" is most likely an NXP part. NXP makes a LM75A and LM75B.
> > Both are 11-bit resolution and 100ms sample time, so "national,lm75b" is
> > the closest match.
> >
> > While we're here, fix the node names to use the generic name
> > "temperature-sensor".
> >
> > Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
> > ---
> > SoC maintainers, Please take this directly.
> > ---
> >  .../aspeed/aspeed-bmc-facebook-greatlakes.dts |  2 +-
> >  .../socfpga/socfpga_cyclone5_vining_fpga.dts  |  4 +--
> >  .../dts/marvell/armada-385-clearfog-gtr.dtsi  |  8 ++---
> >  .../boot/dts/nuvoton/nuvoton-npcm730-kudo.dts | 32 +++++++++----------
> >  .../boot/dts/nuvoton/nuvoton-npcm750-evb.dts  |  6 ++--
> >  arch/arm/boot/dts/nxp/imx/imx53-mba53.dts     |  4 +--
> >  arch/arm/boot/dts/nxp/imx/imx53-tqma53.dtsi   |  4 +--
> >  .../dts/nxp/lpc/lpc4357-ea4357-devkit.dts     |  4 +--
> >  .../boot/dts/nxp/lpc/lpc4357-myd-lpc4357.dts  |  2 +-
> >  arch/arm/boot/dts/ti/omap/am335x-nano.dts     |  2 +-
> >  .../boot/dts/xilinx/zynq-zturn-common.dtsi    |  4 +--
> >  11 files changed, 36 insertions(+), 36 deletions(-)
> >
> < [snip]
> > diff --git a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> > index 2117de872703..d155b3ec22ef 100644
> > --- a/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> > +++ b/arch/arm/boot/dts/nxp/imx/imx53-mba53.dts
> > @@ -175,8 +175,8 @@ expander: pca9554@20 {
> >               gpio-controller;
> >       };
> >
> > -     sensor2: lm75@49 {
> > -             compatible = "lm75";
> > +     sensor2: temperature-sensor@49 {
> > +             compatible = "national,lm75";
>
> I checked the old schematics. This is an NXP LM75A, so 'national,lm75a'
> would be the correct compatible.

Thanks for checking. That doesn't change the configuration in the
driver. lm75 and lm75a are treated the same as both are 9-bit
resolution. The NXP LM75A is 11-bit resolution and 10Hz which
corresponds to lm75b in the driver. Though it looks to me like the
original lm75b was also 9-bit resolution.

Rob