From: Maxime Ripard <maxime@cerno.tech>
To: Andre Przywara <andre.przywara@arm.com>
Cc: Ivan Uvarov <i.uvarov@cognitivepilot.com>,
devicetree@vger.kernel.org, Chen-Yu Tsai <wens@csie.org>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Icenowy Zheng <icenowy@aosc.io>
Subject: Re: [PATCH v2 1/4] ARM: dts: sun8i: r40: add /omit-if-no-ref/ to pinmux nodes for UARTs 0&3
Date: Thu, 25 Mar 2021 15:12:11 +0100 [thread overview]
Message-ID: <20210325141211.5bfemlmn5dkurlym@gilmour> (raw)
In-Reply-To: <20210322161804.0395de61@slackpad.fritz.box>
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On Mon, Mar 22, 2021 at 04:18:04PM +0000, Andre Przywara wrote:
> On Mon, 22 Mar 2021 13:55:35 +0300
> Ivan Uvarov <i.uvarov@cognitivepilot.com> wrote:
>
> Hi,
>
> > This patch adds the /omit-if-no-ref/ keyword to the pio nodes for
> > UART0 and UART3 pins of the R40 SoC, which would reduce the fdt size on
> > boards which do not use these UARTs.
>
> But what boards are those? It seems like all boards use uart3-pg and
> the two existing boards use UART0.
>
> I think the idea is to use omit-if-no-ref on some rarely used nodes, so
> if there is only a single user, for instance. Your next patch is a good
> example.
There's no real cost associated to it though, so it's just easier to
flag all the nodes and let the compiler figure out if it should evict
them or not.
Maxime
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next prev parent reply other threads:[~2021-03-25 14:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 10:55 [PATCH v2 0/4] add devicetree for Forlinx FETA40i-C & OKA40i-C Ivan Uvarov
2021-03-22 10:55 ` [PATCH v2 1/4] ARM: dts: sun8i: r40: add /omit-if-no-ref/ to pinmux nodes for UARTs 0&3 Ivan Uvarov
2021-03-22 16:18 ` Andre Przywara
2021-03-23 9:59 ` Ivan Uvarov
2021-03-25 14:12 ` Maxime Ripard [this message]
2021-03-22 10:55 ` [PATCH v2 2/4] ARM: dts: sun8i: r40: add pinmux settings for MMC3 and UARTs 2, 4, 5&7 Ivan Uvarov
2021-03-22 16:24 ` [PATCH v2 2/4] ARM: dts: sun8i: r40: add pinmux settings for MMC3 and UARTs 2,4,5&7 Andre Przywara
2021-03-22 10:55 ` [PATCH v2 3/4] dt-bindings: arm: add compatible strings for Forlinx OKA40i-C Ivan Uvarov
2021-03-22 16:27 ` Andre Przywara
2021-03-22 10:55 ` [PATCH v2 4/4] ARM: dts: sun8i: r40: add devicetree for Forlinx FETA40i-C & OKA40i-C Ivan Uvarov
2021-03-22 16:47 ` Andre Przywara
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