2023-12-21 16:49:52

by Christoph Niedermaier

Subject: [PATCH] ARM: dts: imx6ull-dhcor: Remove 900MHz operating point

Due to CPU lifetime consideration of the SoC manufacturer [1] and
the preferred area of operation in the industrial related
environment, set the maximum frequency for each DHCOM i.MX6ULL to
792MHz, as with the industrial type. This is done by removing the
operating point at 900MHz and set the clock-frequency to 792000000.

[1] https://www.nxp.com/docs/en/application-note/AN5337.pdf

Signed-off-by: Christoph Niedermaier <[email protected]>
---
Cc: Rob Herring <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: NXP Linux Team <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
To: [email protected]
---
arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-som.dtsi | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-som.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-som.dtsi
index 45315adfaa86..75486e1b0c15 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-som.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-som.dtsi
@@ -28,10 +28,14 @@
/*
* Due to the design as a solderable SOM, there are no capacitors
* below the SoC, therefore higher voltages are required.
+ * Due to CPU lifetime consideration of the SoC manufacturer and
+ * the preferred area of operation in the industrial related
+ * environment, set the maximum frequency for each DHCOM i.MX6ULL
+ * to 792MHz, as with the industrial type.
*/
+ clock-frequency = <792000000>;
operating-points = <
/* kHz uV */
- 900000 1275000
792000 1250000 /* Voltage increased */
528000 1175000
396000 1025000
@@ -39,7 +43,6 @@
>;
fsl,soc-operating-points = <
/* KHz uV */
- 900000 1250000
792000 1250000 /* Voltage increased */
528000 1175000
396000 1175000
--
2.11.0

2024-02-05 05:52:56

by Shawn Guo

Subject: Re: [PATCH] ARM: dts: imx6ull-dhcor: Remove 900MHz operating point

On Thu, Dec 21, 2023 at 05:46:33PM +0100, Christoph Niedermaier wrote:
> Due to CPU lifetime consideration of the SoC manufacturer [1] and
> the preferred area of operation in the industrial related
> environment, set the maximum frequency for each DHCOM i.MX6ULL to
> 792MHz, as with the industrial type. This is done by removing the
> operating point at 900MHz and set the clock-frequency to 792000000.
>
> [1] https://www.nxp.com/docs/en/application-note/AN5337.pdf
>
> Signed-off-by: Christoph Niedermaier <[email protected]>

Applied, thanks!