linux-kernel - AW: [PATCH 7/7] arm64: dts: freescale: add initial tree for TQMa8Mx with i.MX8M

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Date:   Tue, 12 Oct 2021 14:15:14 +0000
From:   "Alexander Stein" <Alexander.Stein@...tq-group.com>
To:     "Rob Herring" <robh@...nel.org>, "Shawn Guo" <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "Catalin Marinas" <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     "Pengutronix Kernel Team" <kernel@...gutronix.de>,
        "Fabio Estevam" <festevam@...il.com>,
        "NXP Linux Team" <linux-imx@....com>,
        devicetree@...r.kernel.org 
        <devicetree@...r.kernel.org>,
        linux-kernel@...r.kernel.org 
        <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org 
        <linux-arm-kernel@...ts.infradead.org>
Subject: AW: [PATCH 7/7] arm64: dts: freescale: add initial tree for TQMa8Mx
 with i.MX8M

Hello,


On Wed, Oct 06, 2021 at 15:23 +0200, Alexander Stein wrote:
> This adds support for TQMa8Mx module on MBa8Mx board.
>
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |   1 +
>  .../dts/freescale/imx8mq-tqma8mq-mba8mx.dts   | 416 ++++++++++++++++++
>  .../boot/dts/freescale/imx8mq-tqma8mq.dtsi    | 369 ++++++++++++++++
>  3 files changed, 786 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mq-tqma8mq.dtsi

This can not be applied as is. The board does not boot if the RTC driver is compiled-in.
Reason is that the RTC clkout is connected to the RTC pad which is the 32KHz ISC input.
So once the core system started and all unused clocks are disabled, 'pcf85063-clkout'
will be disabled as well, essentially halting the ccm input.
I've yet to come up with a solution to this setup, so the TQMa8Mx related patches can
be ignored for now.

Best regards,
Alexander