* [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies
@ 2023-07-09 20:30 Dmitry Baryshkov
2023-07-09 20:45 ` Fabio Estevam
2023-07-19 2:15 ` Shawn Guo
0 siblings, 2 replies; 3+ messages in thread
From: Dmitry Baryshkov @ 2023-07-09 20:30 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
NXP Linux Team
Cc: devicetree, linux-arm-kernel
The SK-IMX53 board, bearing i.MX536A CPU, is not stable when running at
1.2 GHz (default iMX53 maximum). The SoC is only rated up to 800 MHz.
Disable 1.2 GHz and 1 GHz frequencies.
Fixes: 0b8576d8440a ("ARM: dts: imx: Add support for SK-iMX53 board")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
Changes since v1:
- After additional consideration, also disable the 1 GHz frequency. The
datasheets are clear the the SoC is not required to support this
frequency (Fabio).
---
arch/arm/boot/dts/nxp/imx/imx53-sk-imx53.dts | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm/boot/dts/nxp/imx/imx53-sk-imx53.dts b/arch/arm/boot/dts/nxp/imx/imx53-sk-imx53.dts
index 6ea103a49697..3d9f14f32efd 100644
--- a/arch/arm/boot/dts/nxp/imx/imx53-sk-imx53.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx53-sk-imx53.dts
@@ -77,6 +77,16 @@ &can1 {
status = "okay";
};
+&cpu0 {
+ /* CPU rated to 800 MHz, not the default 1.2GHz. */
+ operating-points = <
+ /* kHz uV */
+ 166666 850000
+ 400000 900000
+ 800000 1050000
+ >;
+};
+
&ecspi1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1>;
--
2.39.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies
2023-07-09 20:30 [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies Dmitry Baryshkov
@ 2023-07-09 20:45 ` Fabio Estevam
2023-07-19 2:15 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Fabio Estevam @ 2023-07-09 20:45 UTC (permalink / raw)
To: Dmitry Baryshkov
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, NXP Linux Team, devicetree,
linux-arm-kernel
On Sun, Jul 9, 2023 at 5:30 PM Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> wrote:
>
> The SK-IMX53 board, bearing i.MX536A CPU, is not stable when running at
> 1.2 GHz (default iMX53 maximum). The SoC is only rated up to 800 MHz.
> Disable 1.2 GHz and 1 GHz frequencies.
>
> Fixes: 0b8576d8440a ("ARM: dts: imx: Add support for SK-iMX53 board")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies
2023-07-09 20:30 [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies Dmitry Baryshkov
2023-07-09 20:45 ` Fabio Estevam
@ 2023-07-19 2:15 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Shawn Guo @ 2023-07-19 2:15 UTC (permalink / raw)
To: Dmitry Baryshkov
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Sascha Hauer,
Pengutronix Kernel Team, Fabio Estevam, NXP Linux Team,
devicetree, linux-arm-kernel
On Sun, Jul 09, 2023 at 11:30:19PM +0300, Dmitry Baryshkov wrote:
> The SK-IMX53 board, bearing i.MX536A CPU, is not stable when running at
> 1.2 GHz (default iMX53 maximum). The SoC is only rated up to 800 MHz.
> Disable 1.2 GHz and 1 GHz frequencies.
>
> Fixes: 0b8576d8440a ("ARM: dts: imx: Add support for SK-iMX53 board")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Applied, thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-07-09 20:30 [PATCH v2] ARM: dts: nxp/imx: limit sk-imx53 supported frequencies Dmitry Baryshkov
2023-07-09 20:45 ` Fabio Estevam
2023-07-19 2:15 ` Shawn Guo
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