[PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Nathan Morrisson]

Add three overlays to disable the eth phy, rtc, and spi nor. These
overlays will be used to disable device tree nodes for components
that are optionally not populated.

v2:
  - Add build time tests in makefile

Nathan Morrisson (4):
  arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
  arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
  arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
  arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor

 arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
 .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
 .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
 .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
 .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
 5 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso

-- 
2.25.1


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[PATCH v2 1/4] arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label

[Nathan Morrisson]

Label the spi nor as serial_flash. This allows us to disable the
flash with an overlay common to all am6xx-phycore-som boards.

Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
---
v2: No change

 arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
index 125e507966fb..ca0bbf21f7fe 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
@@ -296,7 +296,7 @@ &ospi0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&ospi0_pins_default>;
 
-	flash@0 {
+	serial_flash: flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0x0>;
 		spi-tx-bus-width = <8>;
-- 
2.25.1


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[PATCH v2 2/4] arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy

[Nathan Morrisson]

Add an overlay to disable the eth phy for all am6xx-phycore-som
boards.

Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
---
v2:
  - Add build time tests in makefile

 arch/arm64/boot/dts/ti/Makefile               |  7 +++++++
 .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 2c327cc320cf..320da5ea38e0 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -54,6 +54,9 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-wlan.dtbo
 
+# Common overlays for the phyCORE-AM6* family of boards
+dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-eth-phy.dtbo
+
 # Boards with AM65x SoC
 k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb \
 	k3-am654-base-board-rocktech-rk101-panel.dtbo \
@@ -107,6 +110,8 @@ k3-am625-beagleplay-csi2-ov5640-dtbs := k3-am625-beagleplay.dtb \
 	k3-am625-beagleplay-csi2-ov5640.dtbo
 k3-am625-beagleplay-csi2-tevi-ov5640-dtbs := k3-am625-beagleplay.dtb \
 	k3-am625-beagleplay-csi2-tevi-ov5640.dtbo
+k3-am625-phyboard-lyra-disable-eth-phy-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
+	k3-am6xx-phycore-disable-eth-phy.dtbo
 k3-am625-phyboard-lyra-gpio-fan-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am62x-phyboard-lyra-gpio-fan.dtbo
 k3-am625-sk-csi2-imx219-dtbs := k3-am625-sk.dtb \
@@ -132,6 +137,8 @@ k3-am62p5-sk-csi2-tevi-ov5640-dtbs := k3-am62p5-sk.dtb \
 	k3-am62x-sk-csi2-tevi-ov5640.dtbo
 k3-am642-evm-icssg1-dualemac-dtbs := \
 	k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac.dtbo
+k3-am642-phyboard-electra-disable-eth-phy-dtbs := \
+	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-eth-phy.dtbo
 k3-am642-phyboard-electra-gpio-fan-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-gpio-fan.dtbo
 k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \
diff --git a/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
new file mode 100644
index 000000000000..356c82bbe143
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (C) 2023 PHYTEC America, LLC
+ * Author: Garrett Giordano <ggiordano@phytec.com>
+ *
+ * Copyright (C) 2024 PHYTEC America, LLC
+ * Author: Nathan Morrisson <nmorrisson@phytec.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+&cpsw3g_phy1 {
+	status = "disabled";
+};
+
+&cpsw_port1 {
+	status = "disabled";
+};
-- 
2.25.1


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[PATCH v2 3/4] arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc

[Nathan Morrisson]

Add an overlay to disable the rtc for all am6xx-phycore-som boards.

Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
---
v2:
  - Add build time tests in makefile

 arch/arm64/boot/dts/ti/Makefile                   |  5 +++++
 .../boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso | 15 +++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 320da5ea38e0..3d0e87a78e09 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -56,6 +56,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-wlan.dtbo
 
 # Common overlays for the phyCORE-AM6* family of boards
 dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-eth-phy.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-rtc.dtbo
 
 # Boards with AM65x SoC
 k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb \
@@ -112,6 +113,8 @@ k3-am625-beagleplay-csi2-tevi-ov5640-dtbs := k3-am625-beagleplay.dtb \
 	k3-am625-beagleplay-csi2-tevi-ov5640.dtbo
 k3-am625-phyboard-lyra-disable-eth-phy-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am6xx-phycore-disable-eth-phy.dtbo
+k3-am625-phyboard-lyra-disable-rtc-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
+	k3-am6xx-phycore-disable-rtc.dtbo
 k3-am625-phyboard-lyra-gpio-fan-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am62x-phyboard-lyra-gpio-fan.dtbo
 k3-am625-sk-csi2-imx219-dtbs := k3-am625-sk.dtb \
@@ -139,6 +142,8 @@ k3-am642-evm-icssg1-dualemac-dtbs := \
 	k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac.dtbo
 k3-am642-phyboard-electra-disable-eth-phy-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-eth-phy.dtbo
+k3-am642-phyboard-electra-disable-rtc-dtbs := \
+	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-rtc.dtbo
 k3-am642-phyboard-electra-gpio-fan-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-gpio-fan.dtbo
 k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \
diff --git a/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
new file mode 100644
index 000000000000..8b24191f5948
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (C) 2023 PHYTEC America, LLC
+ * Author: Garrett Giordano <ggiordano@phytec.com>
+ *
+ * Copyright (C) 2024 PHYTEC America, LLC
+ * Author: Nathan Morrisson <nmorrisson@phytec.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+&i2c_som_rtc {
+	status = "disabled";
+};
-- 
2.25.1


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[PATCH v2 4/4] arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor

[Nathan Morrisson]

Add an overlay to disable the spi nor for all am6xx-phycore-som
boards.

Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
---
v2:
  - Add build time tests in makefile

 arch/arm64/boot/dts/ti/Makefile                   |  5 +++++
 .../dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 3d0e87a78e09..8d8fc8bfaf7e 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -57,6 +57,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-wlan.dtbo
 # Common overlays for the phyCORE-AM6* family of boards
 dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-eth-phy.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-rtc.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am6xx-phycore-disable-spi-nor.dtbo
 
 # Boards with AM65x SoC
 k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb \
@@ -115,6 +116,8 @@ k3-am625-phyboard-lyra-disable-eth-phy-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am6xx-phycore-disable-eth-phy.dtbo
 k3-am625-phyboard-lyra-disable-rtc-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am6xx-phycore-disable-rtc.dtbo
+k3-am625-phyboard-lyra-disable-spi-nor-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
+	k3-am6xx-phycore-disable-spi-nor.dtbo
 k3-am625-phyboard-lyra-gpio-fan-dtbs := k3-am625-phyboard-lyra-rdk.dtb \
 	k3-am62x-phyboard-lyra-gpio-fan.dtbo
 k3-am625-sk-csi2-imx219-dtbs := k3-am625-sk.dtb \
@@ -144,6 +147,8 @@ k3-am642-phyboard-electra-disable-eth-phy-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-eth-phy.dtbo
 k3-am642-phyboard-electra-disable-rtc-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-rtc.dtbo
+k3-am642-phyboard-electra-disable-spi-nor-dtbs := \
+	k3-am642-phyboard-electra-rdk.dtb k3-am6xx-phycore-disable-spi-nor.dtbo
 k3-am642-phyboard-electra-gpio-fan-dtbs := \
 	k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-gpio-fan.dtbo
 k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \
diff --git a/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
new file mode 100644
index 000000000000..cc0cf269b6e4
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (C) 2023 PHYTEC America, LLC
+ * Author: Garrett Giordano <ggiordano@phytec.com>
+ *
+ * Copyright (C) 2024 PHYTEC America, LLC
+ * Author: Nathan Morrisson <nmorrisson@phytec.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+&serial_flash {
+	status = "disabled";
+};
-- 
2.25.1


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Re: [PATCH v2 1/4] arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label

[Wadim Egorov]

Am 29.05.24 um 00:51 schrieb Nathan Morrisson:
> Label the spi nor as serial_flash. This allows us to disable the
> flash with an overlay common to all am6xx-phycore-som boards.
> 
> Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>

For all 3 patches,

Reviewed-by: Wadim Egorov <w.egorov@phytec.de>

> ---
> v2: No change
> 
>   arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> index 125e507966fb..ca0bbf21f7fe 100644
> --- a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
> @@ -296,7 +296,7 @@ &ospi0 {
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&ospi0_pins_default>;
>   
> -	flash@0 {
> +	serial_flash: flash@0 {
>   		compatible = "jedec,spi-nor";
>   		reg = <0x0>;
>   		spi-tx-bus-width = <8>;

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Re: [PATCH v2 1/4] arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label

[Krzysztof Kozlowski]

On 31/05/2024 10:28, Wadim Egorov wrote:
> 
> 
> Am 29.05.24 um 00:51 schrieb Nathan Morrisson:
>> Label the spi nor as serial_flash. This allows us to disable the
>> flash with an overlay common to all am6xx-phycore-som boards.
>>
>> Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
> 
> For all 3 patches,
> 
> Reviewed-by: Wadim Egorov <w.egorov@phytec.de>

Tooling does not work like this. You need to review each or provide tag
for 4 (not three) in cover letter.

Best regards,
Krzysztof


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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Wadim Egorov]

Am 29.05.24 um 00:51 schrieb Nathan Morrisson:
> Add three overlays to disable the eth phy, rtc, and spi nor. These
> overlays will be used to disable device tree nodes for components
> that are optionally not populated.
> 
> v2:
>    - Add build time tests in makefile

For the whole series,

Reviewed-by: Wadim Egorov <w.egorov@phytec.de>

> 
> Nathan Morrisson (4):
>    arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
> 
>   arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>   .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>   .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>   .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>   .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>   5 files changed, 67 insertions(+), 1 deletion(-)
>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
> 

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Re: [PATCH v2 1/4] arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label

[Wadim Egorov]

Am 31.05.24 um 10:53 schrieb Krzysztof Kozlowski:
> On 31/05/2024 10:28, Wadim Egorov wrote:
>>
>>
>> Am 29.05.24 um 00:51 schrieb Nathan Morrisson:
>>> Label the spi nor as serial_flash. This allows us to disable the
>>> flash with an overlay common to all am6xx-phycore-som boards.
>>>
>>> Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
>>
>> For all 3 patches,
>>
>> Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
> 
> Tooling does not work like this. You need to review each or provide tag
> for 4 (not three) in cover letter.

4 patches, you are right. Missed that.

> 
> Best regards,
> Krzysztof
> 

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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Vignesh Raghavendra]

Hi Nathan,

On 29/05/24 04:21, Nathan Morrisson wrote:
> Add three overlays to disable the eth phy, rtc, and spi nor. These
> overlays will be used to disable device tree nodes for components
> that are optionally not populated.
> 
> v2:
>   - Add build time tests in makefile
> 
> Nathan Morrisson (4):
>   arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label


>   arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>   arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>   arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
> 
>  arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>  .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>  .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>  .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>  .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>  5 files changed, 67 insertions(+), 1 deletion(-)

>  create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>  create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>  create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
> 

I am not sure if this a common practice to have overlays to disable
missing components (at least I dont see such dtso in kernel). I would
like to see an what DT maintainers feel as such dtsos can explode in
numbers.

Is this something that U-Boot can detect and fix up for the Linux DT?

Unpopulated SPI flash and RTC should ideally not be an issue as drivers
would gracefully fail albeit with some sort of error msg.
Not so sure about Eth PHYs though.

Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
not RTC, have RTC and SPI Flash but no ETH PHY?

-- 
Regards
Vignesh

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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Nathan Morrisson]

Hi Vignesh,

On 6/3/24 10:41 AM, Vignesh Raghavendra wrote:
> Hi Nathan,
>
> On 29/05/24 04:21, Nathan Morrisson wrote:
>> Add three overlays to disable the eth phy, rtc, and spi nor. These
>> overlays will be used to disable device tree nodes for components
>> that are optionally not populated.
>>
>> v2:
>>    - Add build time tests in makefile
>>
>> Nathan Morrisson (4):
>>    arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
>
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
>>
>>   arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>>   .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>>   .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>>   .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>>   .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>>   5 files changed, 67 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
>>
> I am not sure if this a common practice to have overlays to disable
> missing components (at least I dont see such dtso in kernel). I would
> like to see an what DT maintainers feel as such dtsos can explode in
> numbers.
>
> Is this something that U-Boot can detect and fix up for the Linux DT?
We have an EEPROM on our board with information on what is populated on 
that particular board. We will apply these overlays based on that EEPROM 
data.
>
> Unpopulated SPI flash and RTC should ideally not be an issue as drivers
> would gracefully fail albeit with some sort of error msg.
> Not so sure about Eth PHYs though.
>
> Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
> not RTC, have RTC and SPI Flash but no ETH PHY?

They are not mutually exclusive, you could have any combination of 
overlays applied.


Regards,

Nathan

>

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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Wadim Egorov]

Add: Daniel Schultz

Am 03.06.24 um 19:41 schrieb Vignesh Raghavendra:
> Hi Nathan,
> 
> On 29/05/24 04:21, Nathan Morrisson wrote:
>> Add three overlays to disable the eth phy, rtc, and spi nor. These
>> overlays will be used to disable device tree nodes for components
>> that are optionally not populated.
>>
>> v2:
>>    - Add build time tests in makefile
>>
>> Nathan Morrisson (4):
>>    arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
> 
> 
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
>>
>>   arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>>   .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>>   .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>>   .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>>   .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>>   5 files changed, 67 insertions(+), 1 deletion(-)
> 
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
>>
> 
> I am not sure if this a common practice to have overlays to disable
> missing components (at least I dont see such dtso in kernel). I would
> like to see an what DT maintainers feel as such dtsos can explode in
> numbers.
> 
> Is this something that U-Boot can detect and fix up for the Linux DT?
> 
> Unpopulated SPI flash and RTC should ideally not be an issue as drivers
> would gracefully fail albeit with some sort of error msg.
> Not so sure about Eth PHYs though.
> 
> Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
> not RTC, have RTC and SPI Flash but no ETH PHY?
> 

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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Daniel Schultz]

Hi Vignesh,

On 10.06.24 10:07, Wadim Egorov wrote:
> Add: Daniel Schultz
>
> Am 03.06.24 um 19:41 schrieb Vignesh Raghavendra:
>> Hi Nathan,
>>
>> On 29/05/24 04:21, Nathan Morrisson wrote:
>>> Add three overlays to disable the eth phy, rtc, and spi nor. These
>>> overlays will be used to disable device tree nodes for components
>>> that are optionally not populated.
>>>
>>> v2:
>>>    - Add build time tests in makefile
>>>
>>> Nathan Morrisson (4):
>>>    arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
>>
>>
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
>>>
>>>   arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>>>   .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>>>   .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 
>>> +++++++++++++++++++
>>>   .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>>>   .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>>>   5 files changed, 67 insertions(+), 1 deletion(-)
>>
>>>   create mode 100644 
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>>>   create mode 100644 
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>>>   create mode 100644 
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
>>>
>>
>> I am not sure if this a common practice to have overlays to disable
>> missing components (at least I dont see such dtso in kernel). I would
>> like to see an what DT maintainers feel as such dtsos can explode in
>> numbers.
>>
>> Is this something that U-Boot can detect and fix up for the Linux DT?
>>
>> Unpopulated SPI flash and RTC should ideally not be an issue as drivers
>> would gracefully fail albeit with some sort of error msg.
>> Not so sure about Eth PHYs though.
>>
>> Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
>> not RTC, have RTC and SPI Flash but no ETH PHY?

Let me explain a little bit why we would like to have those overlays 
upstream.

Our SOMs come with a so-called "option tree" to produce one product with 
different components. For example, our standard part name for the 
phyCORE-AM62x is PCM-071-5432DE11I.A0 and the option tree is located 
between PCM-071 and A0. In this particular tree, the fourth character 
defines the DDR size with 2GB. If we have a customer with less memory 
requirements, we can simply produce the 1GB variant (PCM-071-5431...) 
and lower the cost.

Luckily, we can read the TI SOC part number in u-boot and disable 
non-existing components like CPU cores, GPUs, etc. in the Linux 
device-tree. However, we still need to handle all modifiable parts on 
our SOMs. For the phyCORE-AM62x, this would be the DDR size, SPI-NOR 
size and flash type (Q/OSPI), and whether the RTC and Ethernet PHY are 
populated. The DDR size can be handled completely in SPL, but for 
everything else we need to modify our Linux device-tree. The easiest and 
cleanest way to do that is by applying overlays, which are located next 
to the device-tree. I'm not a fan of letting drivers fail to probe. 
Customers with extensive product verifications most likely need to 
disable those manually, which is against the idea of buying a 
fully-functional SOM. Alternatively, we need to hard-code fixups in our 
U-Boot which means some U-Boot/Linux combinations might not boot anymore 
or we maintain them in a Phytec repository and never archive fully 
upstream status for our products.

Regarding the number of overlays. We use those three plus an additional 
one, which we need to upstream too, for the AM62x, AM62Ax, and AM64x. 
The upcoming AM62P and AM67 require one additional overlay for an 
optional, second EEPROM. In total we need 5 overlays for 5 AM6 products.

Best Regards,
Daniel



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Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Vignesh Raghavendra]

On 05/06/24 04:45, Nathan Morrisson wrote:
> Hi Vignesh,
> 
> On 6/3/24 10:41 AM, Vignesh Raghavendra wrote:
>> Hi Nathan,
>>
>> On 29/05/24 04:21, Nathan Morrisson wrote:
>>> Add three overlays to disable the eth phy, rtc, and spi nor. These
>>> overlays will be used to disable device tree nodes for components
>>> that are optionally not populated.
>>>
>>> v2:
>>>    - Add build time tests in makefile
>>>
>>> Nathan Morrisson (4):
>>>    arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
>>
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>>>    arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
>>>
>>>   arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>>>   .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>>>   .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>>>   .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>>>   .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>>>   5 files changed, 67 insertions(+), 1 deletion(-)
>>>   create mode 100644
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>>>   create mode 100644
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>>>   create mode 100644
>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
>>>
>> I am not sure if this a common practice to have overlays to disable
>> missing components (at least I dont see such dtso in kernel). I would
>> like to see an what DT maintainers feel as such dtsos can explode in
>> numbers.
>>
>> Is this something that U-Boot can detect and fix up for the Linux DT?

> We have an EEPROM on our board with information on what is populated on     
> that particular board. We will apply these overlays based on that EEPROM
> data.

Typical usage of overlay is to keep the minimum in baseboard and enable
optional components in the overlay. But it would also depend on whats
information is present in the EEPROM.

Could you provide bit more color on whats in EEPROM and how each overlay
would be applied? Please add the same to commit message and respin.

>>
>> Unpopulated SPI flash and RTC should ideally not be an issue as drivers
>> would gracefully fail albeit with some sort of error msg.
>> Not so sure about Eth PHYs though.
>>
>> Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
>> not RTC, have RTC and SPI Flash but no ETH PHY?
> 
> They are not mutually exclusive, you could have any combination of
> overlays applied.
> 
> 
> Regards,
> 
> Nathan
> 
>>

-- 
Regards
Vignesh

Re: [PATCH v2 0/4] Add overlays to disable optional hardware in k3-am6xx-phycore-som boards

[Nathan Morrisson]

On 6/12/24 3:19 AM, Vignesh Raghavendra wrote:
>
> On 05/06/24 04:45, Nathan Morrisson wrote:
>> Hi Vignesh,
>>
>> On 6/3/24 10:41 AM, Vignesh Raghavendra wrote:
>>> Hi Nathan,
>>>
>>> On 29/05/24 04:21, Nathan Morrisson wrote:
>>>> Add three overlays to disable the eth phy, rtc, and spi nor. These
>>>> overlays will be used to disable device tree nodes for components
>>>> that are optionally not populated.
>>>>
>>>> v2:
>>>>     - Add build time tests in makefile
>>>>
>>>> Nathan Morrisson (4):
>>>>     arm64: dts: ti: k3-am64-phycore-som: Add serial_flash label
>>>>     arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable eth phy
>>>>     arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disable rtc
>>>>     arm64: dts: ti: k3-am6xx-phycore-som: Add overlay to disabl spi nor
>>>>
>>>>    arch/arm64/boot/dts/ti/Makefile               | 17 +++++++++++++++++
>>>>    .../boot/dts/ti/k3-am64-phycore-som.dtsi      |  2 +-
>>>>    .../ti/k3-am6xx-phycore-disable-eth-phy.dtso  | 19 +++++++++++++++++++
>>>>    .../dts/ti/k3-am6xx-phycore-disable-rtc.dtso  | 15 +++++++++++++++
>>>>    .../ti/k3-am6xx-phycore-disable-spi-nor.dtso  | 15 +++++++++++++++
>>>>    5 files changed, 67 insertions(+), 1 deletion(-)
>>>>    create mode 100644
>>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-eth-phy.dtso
>>>>    create mode 100644
>>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-rtc.dtso
>>>>    create mode 100644
>>>> arch/arm64/boot/dts/ti/k3-am6xx-phycore-disable-spi-nor.dtso
>>>>
>>> I am not sure if this a common practice to have overlays to disable
>>> missing components (at least I dont see such dtso in kernel). I would
>>> like to see an what DT maintainers feel as such dtsos can explode in
>>> numbers.
>>>
>>> Is this something that U-Boot can detect and fix up for the Linux DT?
>> We have an EEPROM on our board with information on what is populated on
>> that particular board. We will apply these overlays based on that EEPROM
>> data.
> Typical usage of overlay is to keep the minimum in baseboard and enable
> optional components in the overlay. But it would also depend on whats
> information is present in the EEPROM.
>
> Could you provide bit more color on whats in EEPROM and how each overlay
> would be applied? Please add the same to commit message and respin.

The EEPROM contains information about the configuration of the board. 
The standard configuration has an ethernet phy, rtc, and spi nor. These 
components can be left out to save cost, and that configuration 
information is what is stored in the EEPROM. If these components are not 
used, then we would use these overlays to change the device tree 
appropriately.

I will send a new version with this in the commit, and there is also a 
more detailed explanation at [1].

[1] 
https://lore.kernel.org/lkml/4e7dd467-20be-43ce-936d-200ede6d511b@phytec.de/

Regards,

Nathan

>
>>> Unpopulated SPI flash and RTC should ideally not be an issue as drivers
>>> would gracefully fail albeit with some sort of error msg.
>>> Not so sure about Eth PHYs though.
>>>
>>> Also, Are these dtso's mutually exclusive? ie can SoM have SPI flash but
>>> not RTC, have RTC and SPI Flash but no ETH PHY?
>> They are not mutually exclusive, you could have any combination of
>> overlays applied.
>>
>>
>> Regards,
>>
>> Nathan
>>