[PATCH 0/3] DT labels for connector device mapping

[PATCH 0/3] DT labels for connector device mapping

[Rob Herring]

Having a common connector interface across different platforms can be 
problematic for determining which SOC device is connected to which 
connector pins. The standard DT property "label" is intended to provide 
a human readable name for a device and can be used to provide this 
information. Then userspace can can read the label to determine the 
device mapping. For example:

for f in $(ls -d /sys/class/tty/tty*); do
  label=$(cat $f/device/of_node/label)
  if [ "$label" = "LS-UART1" ]; then
    # you've found UART1, so do something with it.
    # $f/dev is the major:minor for the /dev node
  fi
done

This series adds labels on hikey and dragonboard 410c devices for the 
low speed and high speed connectors. Not tested at all.

BTW, there are no platform maintainers listed for these files. Setting 
them should be enforced for the dts files as DT maintainers mainly 
review binding docs, not dts files.

Rob

Rob Herring (3):
  arm64: dts: apq8016-sbc: enable UART0 on LS connector
  arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI
  arm64: dts: hikey: add label properties to UARTs

 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts |  7 +++++++
 arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi      | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

-- 
2.5.0

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[PATCH 1/3] arm64: dts: apq8016-sbc: enable UART0 on LS connector

[Rob Herring]

The LS UART0 is not used by anything else and should be enabled for
expansion boards.

Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
index 6b8abbe..7505fa3 100644
--- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
+++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
@@ -27,6 +27,13 @@
 	};
 
 	soc {
+		serial@78af000 {
+			status = "okay";
+			pinctrl-names = "default", "sleep";
+			pinctrl-0 = <&blsp1_uart1_default>;
+			pinctrl-1 = <&blsp1_uart1_sleep>;
+		};
+
 		serial@78b0000 {
 			status = "okay";
 			pinctrl-names = "default", "sleep";
-- 
2.5.0

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[PATCH 2/3] arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI

[Rob Herring]

Add label properties to provide a way to identify UART, I2C and SPI
ports based on their connector names. This follows naming convention in
96boards CE spec. Ports without external connections are not labelled.

Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
index 7505fa3..14fafa1 100644
--- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
+++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
@@ -28,6 +28,7 @@
 
 	soc {
 		serial@78af000 {
+			label = "LS-UART0";
 			status = "okay";
 			pinctrl-names = "default", "sleep";
 			pinctrl-0 = <&blsp1_uart1_default>;
@@ -35,6 +36,7 @@
 		};
 
 		serial@78b0000 {
+			label = "LS-UART1";
 			status = "okay";
 			pinctrl-names = "default", "sleep";
 			pinctrl-0 = <&blsp1_uart2_default>;
@@ -43,26 +45,31 @@
 
 		i2c@78b6000 {
 		/* On Low speed expansion */
+			label = "LS-I2C0";
 			status = "okay";
 		};
 
 		i2c@78b8000 {
 		/* On High speed expansion */
+			label = "HS-I2C2";
 			status = "okay";
 		};
 
 		i2c@78ba000 {
 		/* On Low speed expansion */
+			label = "LS-I2C1";
 			status = "okay";
 		};
 
 		spi@78b7000 {
 		/* On High speed expansion */
+			label = "HS-SPI1";
 			status = "okay";
 		};
 
 		spi@78b9000 {
 		/* On Low speed expansion */
+			label = "LS-SPI0";
 			status = "okay";
 		};
 
-- 
2.5.0

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[PATCH 3/3] arm64: dts: hikey: add label properties to UARTs

[Rob Herring]

Add label properties to provide a way to identify UARTs based on their
board or connector name. This follows naming convention in 96boards CE
spec. Ports without external connections are not labelled.

Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
index 8d43a0f..8185251 100644
--- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
+++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
@@ -32,3 +32,10 @@
 		reg = <0x0 0x0 0x0 0x40000000>;
 	};
 };
+
+&uart2 {
+	label = "LS-UART0";
+};
+&uart3 {
+	label = "LS-UART1";
+};
-- 
2.5.0

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Re: [PATCH 0/3] DT labels for connector device mapping

[Jorge Ramirez-Ortiz]

On 12/10/2015 04:21 PM, Rob Herring wrote:
> Having a common connector interface across different platforms can be 
> problematic for determining which SOC device is connected to which 
> connector pins. The standard DT property "label" is intended to provide 
> a human readable name for a device and can be used to provide this 
> information. Then userspace can can read the label to determine the 
> device mapping. For example:
>
> for f in $(ls -d /sys/class/tty/tty*); do
>   label=$(cat $f/device/of_node/label)
>   if [ "$label" = "LS-UART1" ]; then
>     # you've found UART1, so do something with it.
>     # $f/dev is the major:minor for the /dev node
>   fi
> done
>
> This series adds labels on hikey and dragonboard 410c devices for the 
> low speed and high speed connectors. Not tested at all.

should we then use the line-name property on the GPIOs to have a common naming
convention across all 96Boards boards?


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Re: [PATCH 0/3] DT labels for connector device mapping

[Rob Herring]

On Thu, Dec 10, 2015 at 3:36 PM, Jorge Ramirez-Ortiz
<jorge.ramirez-ortiz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> wrote:
> On 12/10/2015 04:21 PM, Rob Herring wrote:
>> Having a common connector interface across different platforms can be
>> problematic for determining which SOC device is connected to which
>> connector pins. The standard DT property "label" is intended to provide
>> a human readable name for a device and can be used to provide this
>> information. Then userspace can can read the label to determine the
>> device mapping. For example:
>>
>> for f in $(ls -d /sys/class/tty/tty*); do
>>   label=$(cat $f/device/of_node/label)
>>   if [ "$label" = "LS-UART1" ]; then
>>     # you've found UART1, so do something with it.
>>     # $f/dev is the major:minor for the /dev node
>>   fi
>> done
>>
>> This series adds labels on hikey and dragonboard 410c devices for the
>> low speed and high speed connectors. Not tested at all.
>
> should we then use the line-name property on the GPIOs to have a common naming
> convention across all 96Boards boards?

I left GPIOs out purpose, but they do need to be handled. I'm not
certain that gpio-hogs is what we want to use here. The other cases
have no s/w impact as label is ignored. The same is not true of
gpio-hogs. Also, if we consider that we may want to describe GPIO
connections to daughterboards with DT overlays, then we wound not want
the gpio-hogs in the DT. That gets into a whole other set of issues
needing a way to remap connector signals to have overlays which work
across different base boards.

Rob
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Re: [PATCH 2/3] arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI

[Kevin Hilman]

Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> writes:

> Add label properties to provide a way to identify UART, I2C and SPI
> ports based on their connector names. This follows naming convention in
> 96boards CE spec. Ports without external connections are not labelled.
>
> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Cc: Srinivas Kandagatla <srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Cc: Andy Gross <agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

Acked-by: Kevin Hilman <khilman-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Tested-by: Kevin Hilman <khilman-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

Tested this on my db410c (along with script from cover letter) and it
works great.

Kevin
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Re: [PATCH 0/3] DT labels for connector device mapping

[Olof Johansson]

On Thu, Dec 10, 2015 at 03:21:10PM -0600, Rob Herring wrote:
> Having a common connector interface across different platforms can be 
> problematic for determining which SOC device is connected to which 
> connector pins. The standard DT property "label" is intended to provide 
> a human readable name for a device and can be used to provide this 
> information. Then userspace can can read the label to determine the 
> device mapping. For example:
> 
> for f in $(ls -d /sys/class/tty/tty*); do
>   label=$(cat $f/device/of_node/label)
>   if [ "$label" = "LS-UART1" ]; then
>     # you've found UART1, so do something with it.
>     # $f/dev is the major:minor for the /dev node
>   fi
> done
> 
> This series adds labels on hikey and dragonboard 410c devices for the 
> low speed and high speed connectors. Not tested at all.
> 
> BTW, there are no platform maintainers listed for these files. Setting 
> them should be enforced for the dts files as DT maintainers mainly 
> review binding docs, not dts files.
> 
> Rob
> 
> Rob Herring (3):
>   arm64: dts: apq8016-sbc: enable UART0 on LS connector
>   arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI
>   arm64: dts: hikey: add label properties to UARTs

Applied all 3 to next/dt64.


-Olof

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