linux-kernel - Re: [PATCH] ARM: dts: gta04: fix excess dma channel usage

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Date:   Mon, 16 Jan 2023 16:51:57 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Adam Ford <aford173@...il.com>
Cc:     Andreas Kemnade <andreas@...nade.info>, bcousson@...libre.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH] ARM: dts: gta04: fix excess dma channel usage

Hi,

* Adam Ford <aford173@...il.com> [230116 14:16]:
> Would it make sense to make this default in the omap3.dtsi file and
> enable them in the individual boards that need it?

In general disabling the unused devices by default for omaps will break
the power management. The disabled devices are completely ignored by the
kernel, and the devices are left to whatever the bootloader state might
be.

For SoCs using firmware to manage devices it's a bit different story
however. The firmware can still idle disabled devices based on a
late_initcall for example, even if the kernel knows nothing about the
disabled devices.

Regards,

Tony