linux-kernel - Re: [PATCH v2] dt-bindings: serial: 8250: allow "main" and "uart" as clock names

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Message-ID: <20250813-squint-glass-b68c6520a229@spud>
Date: Wed, 13 Aug 2025 17:51:28 +0100
From: Conor Dooley <conor@...nel.org>
To: Alex Elder <elder@...cstar.com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	gregkh@...uxfoundation.org, jirislaby@...nel.org, dlan@...too.org,
	matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
	lkundrak@...sk, devicetree@...r.kernel.org,
	linux-serial@...r.kernel.org, spacemit@...ts.linux.dev,
	linux-mediatek@...ts.infradead.org, linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] dt-bindings: serial: 8250: allow "main" and "uart" as
 clock names

On Tue, Aug 12, 2025 at 10:13:35PM -0500, Alex Elder wrote:
> There are two compatible strings defined in "8250.yaml" that require
> two clocks to be specified, along with their names:
>   - "spacemit,k1-uart", used in "spacemit/k1.dtsi"
>   - "nxp,lpc1850-uart", used in "lpc/lpc18xx.dtsi"
> 
> When only one clock is used, the name is not required.  However there
> are two places that do specify a name:
>   - In "mediatek/mt7623.dtsi", the clock for the "mediatek,mtk-btif"
>     compatible serial device is named "main"
>   - In "qca/ar9132.dtsi", the clock for the "ns8250" compatible
>     serial device is named "uart"
> 
> In commit d2db0d7815444 ("dt-bindings: serial: 8250: allow clock
> 'uartclk' and 'reg' for nxp,lpc1850-uart"), Frank Li added the
> restriction that two named clocks be used for the NXP platform
> mentioned above.
> 
> Change that logic, so that an additional condition for (only) the
> SpacemiT platform similarly restricts the two clocks to have the
> names "core" and "bus".
> 
> Finally, add "main" and "uart" as allowed names when a single clock is
> specified.
> 
> Fixes: 2c0594f9f0629 ("dt-bindings: serial: 8250: support an optional second clock")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202507160314.wrC51lXX-lkp@intel.com/
> Signed-off-by: Alex Elder <elder@...cstar.com>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

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