* RV1108G run-time detection
@ 2020-01-09 16:18 ` Otavio Salvador
0 siblings, 0 replies; 2+ messages in thread
From: Otavio Salvador @ 2020-01-09 16:18 UTC (permalink / raw)
To: linux-arm-kernel, linux-rockchip, Heiko Stuebner,
Kernel development list
Hi,
We would like to know if there is a way to distinguish between RV1108
and RV1108G versions in run-time.
The reason we are asking is because arch/arm/boot/dts/rv1108.dtsi
defines the following operational points: 408, 600, 816, 1008 MHz, but
the RV1108G version does not support 1GHz and its maximum operating
frequency is 800MHz (not 816 MHz).
In the i.MX SoCs we can read a fuse that indicates the "speed grading"
of the chip and decide which operating points could be used for that
particular version.
Is there such a mechanism in RV1108? Any suggestions to limiting the
RV1108G operational point at 800MHz?
Thanks
--
Otavio Salvador O.S. Systems
http://www.ossystems.com.br http://code.ossystems.com.br
Mobile: +55 (53) 9 9981-7854 Mobile: +1 (347) 903-9750
^ permalink raw reply [flat|nested] 2+ messages in thread
* RV1108G run-time detection
@ 2020-01-09 16:18 ` Otavio Salvador
0 siblings, 0 replies; 2+ messages in thread
From: Otavio Salvador @ 2020-01-09 16:18 UTC (permalink / raw)
To: linux-arm-kernel, linux-rockchip, Heiko Stuebner,
Kernel development list
Hi,
We would like to know if there is a way to distinguish between RV1108
and RV1108G versions in run-time.
The reason we are asking is because arch/arm/boot/dts/rv1108.dtsi
defines the following operational points: 408, 600, 816, 1008 MHz, but
the RV1108G version does not support 1GHz and its maximum operating
frequency is 800MHz (not 816 MHz).
In the i.MX SoCs we can read a fuse that indicates the "speed grading"
of the chip and decide which operating points could be used for that
particular version.
Is there such a mechanism in RV1108? Any suggestions to limiting the
RV1108G operational point at 800MHz?
Thanks
--
Otavio Salvador O.S. Systems
http://www.ossystems.com.br http://code.ossystems.com.br
Mobile: +55 (53) 9 9981-7854 Mobile: +1 (347) 903-9750
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 2+ messages in thread
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