linux-kernel - Re: [PATCH 1/7] dt-bindings: rtc: sun6i: Add Allwinner A733 support

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Message-ID: <176901459264.3452980.894788621483141855.robh@kernel.org>
Date: Wed, 21 Jan 2026 10:56:33 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Junhui Liu <junhui.liu@...moral.tech>
Cc: Jernej Skrabec <jernej.skrabec@...il.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	linux-rtc@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
	Chen-Yu Tsai <wens@...nel.org>, devicetree@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
	Samuel Holland <samuel@...lland.org>,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/7] dt-bindings: rtc: sun6i: Add Allwinner A733 support


On Wed, 21 Jan 2026 18:59:07 +0800, Junhui Liu wrote:
> The RTC module in the Allwinner A733 SoC is functionally compatible with
> the sun6i RTC, but its internal Clock Control Unit (CCU) has significant
> changes.
> 
> The A733 supports selecting the oscillator between three frequencies:
> 19.2MHz, 24MHz, and 26MHz. The RTC CCU relies on hardware to detect
> which frequency is actually used on the board. By defining all three
> frequencies as fixed-clocks in the device tree, the driver can identify
> the hardware-detected frequency and expose it to the rest of the system.
> 
> Additionally, the A733 RTC CCU provides several new DCXO gate clocks for
> specific modules, including SerDes, HDMI, and UFS.
> 
> Signed-off-by: Junhui Liu <junhui.liu@...moral.tech>
> ---
>  .../bindings/rtc/allwinner,sun6i-a31-rtc.yaml      | 38 ++++++++++++++++++++--
>  include/dt-bindings/clock/sun60i-a733-rtc.h        | 16 +++++++++
>  2 files changed, 52 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>