linux-kernel - Re: [PATCH v2 4/4] ARM: dts: keystone: Add "ti,da830-uart" compatible string

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Date:   Wed, 4 Jan 2017 14:00:01 -0800
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sekhar Nori <nsekhar@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>
Cc:     Franklin S Cooper Jr <fcooper@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Axel Haslam <ahaslam@...libre.com>,
        Alexandre Bailon <abailon@...libre.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/4] ARM: dts: keystone: Add "ti,da830-uart" compatible
 string

On 1/4/2017 12:30 PM, David Lechner wrote:
> The TI Keystone SoCs have extra UART registers beyond the standard 8250
> registers, so we need a new compatible string to indicate this. Also, at
> least one of these registers uses the full 32 bits, so we need to specify
> reg-io-width in addition to reg-shift.
>
> "ns16550a" is left in the compatible specification since it does work as
> long as the bootloader configures the SoC UART power management registers.
>
NAK!!
We can't break the booting boards with existing boot loaders.
I suggest you to first get the driver updated to take care of
the UART PM register and then enable the support for it.