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From: Samuel Holland <samuel@sholland.org>
To: Icenowy Zheng <icenowy@sipeed.com>, Maxime Ripard <maxime@cerno.tech>
Cc: Rob Herring <robh+dt@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Andre Przywara <andre.przywara@arm.com>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 15/17] arm64: allwinner: dts: add DTSI file for R329 SoC
Date: Wed, 18 Aug 2021 21:32:53 -0500	[thread overview]
Message-ID: <75ae9ef8-496b-68ca-214e-e8b270648a50@sholland.org> (raw)
In-Reply-To: <74F51516-2470-4A49-972B-E19D8EDD9A3D@sipeed.com>

On 8/18/21 4:15 AM, Icenowy Zheng wrote:
> 于 2021年8月18日 GMT+08:00 下午5:01:39, Maxime Ripard <maxime@cerno.tech> 写到:
>> On Mon, Aug 02, 2021 at 02:22:10PM +0800, Icenowy Zheng wrote:
>>> +		ccu: clock@2001000 {
>>> +			compatible = "allwinner,sun50i-r329-ccu";
>>> +			reg = <0x02001000 0x1000>;
>>> +			clocks = <&osc24M>, <&rtc 0>, <&rtc 2>;
>>> +			clock-names = "hosc", "losc", "iosc";
>>
>> Do we have a clock tree for the RTC? Is it the same than the H616?
> 
> Nope, it's the same with H6 because of external LOSC crystal is
> possible. (Although production M2A SoMs has it NC for cost control.)

It is not the same as the H6, either. The clock tree _is_ identical to the D1,
which has three diagrams on pages 363-364 of its user manual here:

https://dl.linux-sunxi.org/D1/D1_User_Manual_V0.1_Draft_Version.pdf

Compared to the H6, the R329/D1:
 - Loses the LOSC calibration circuit
 - Gains a third mux input for LOSC (not external 32k) to fanout
 - Gains a mux to choose between LOSC and HOSC/750 for the RTC clock
 - Gains an SPI bus clock input divided from the PRCM AHB

Compared to the H616, the R329/D1:
 - Has an external 32k crystal input
   - Gains the IOSC vs. external 32k crystal mux for LOSC
   - Switches fanout mux input #1 from pll_periph0/N to external 32k
 - Gains a mux to choose between LOSC and HOSC/750 for the RTC clock
 - Gains an SPI bus clock input divided from the PRCM AHB

So the R329/D1 RTC has three inputs:
 - SPI clock from PRCM
 - 24 MHz DCXO crystal
 - 32 kHz external crystal (optional)

and four outputs:
 - 16 MHz "IOSC" RC oscillator
 - 32 kHz "LOSC"
 - ~1 kHz for RTC timekeeping
 - 32 kHz fanout

(Arguably, since the 24 MHz DCXO can be turned on/off from the RTC registers, it
should be an "output" and not an "input".)

Regards,
Samuel

  parent reply	other threads:[~2021-08-19  2:33 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02  6:21 [PATCH 00/17] Basical Allwinner R329 support Icenowy Zheng
2021-08-02  6:21 ` [PATCH 01/17] rtc: sun6i: Fix time overflow handling Icenowy Zheng
2021-08-02  6:21 ` [PATCH 02/17] rtc: sun6i: Add support for linear day storage Icenowy Zheng
2021-08-02  6:21 ` [PATCH 03/17] rtc: sun6i: Add support for broken-down alarm registers Icenowy Zheng
2021-08-02  6:21 ` [PATCH 04/17] dt-bindings: rtc: sun6i: add compatible string for R329 RTC Icenowy Zheng
2021-08-06 21:39   ` Rob Herring
2021-08-02  6:22 ` [PATCH 05/17] rtc: sun6i: add support " Icenowy Zheng
2021-08-02  6:22 ` [PATCH 06/17] dt-bindings: pinctrl: document Allwinner R329 PIO and R-PIO Icenowy Zheng
2021-08-06 21:40   ` Rob Herring
2021-08-18  8:48   ` Maxime Ripard
2021-08-19  2:40   ` Samuel Holland
2021-08-02  6:22 ` [PATCH 07/17] pinctrl: sunxi: add support for R329 CPUX pin controller Icenowy Zheng
2021-08-11  9:23   ` Linus Walleij
2021-08-18  8:48   ` Maxime Ripard
2021-08-19  3:09   ` Samuel Holland
2021-08-02  6:22 ` [PATCH 08/17] pinctrl: sunxi: add support for R329 R-PIO " Icenowy Zheng
2021-08-18  8:52   ` Maxime Ripard
2021-08-19  3:22   ` Samuel Holland
2021-08-02  6:22 ` [PATCH 09/17] dt-bindings: clock: sunxi-ng: add compatibles for R329 CCUs Icenowy Zheng
2021-08-06 21:41   ` Rob Herring
2021-08-02  6:22 ` [PATCH 10/17] clk: sunxi=ng: add support for R329 R-CCU Icenowy Zheng
2021-08-06 21:42   ` Rob Herring
2021-08-18  8:50   ` Maxime Ripard
2021-08-20  0:55   ` Samuel Holland
2021-08-20  4:34     ` Jernej Škrabec
2021-08-25 14:50       ` Maxime Ripard
2021-08-25 15:03         ` Jernej Škrabec
2021-08-25 15:37           ` Maxime Ripard
2021-08-26  0:20       ` Samuel Holland
2021-08-02  6:22 ` [PATCH 11/17] clk: sunxi-ng: add support for Allwinner R329 CCU Icenowy Zheng
2021-08-06 21:42   ` Rob Herring
2021-08-20  2:41   ` Samuel Holland
2021-08-25 14:54     ` Maxime Ripard
2021-08-02  6:22 ` [PATCH 12/17] dt-bindings: mmc: sunxi-mmc: add R329 MMC compatible string Icenowy Zheng
2021-08-06 21:42   ` Rob Herring
2021-08-18  8:47   ` Maxime Ripard
2021-08-02  6:22 ` [PATCH 13/17] mmc: sunxi: add support for R329 MMC controllers Icenowy Zheng
2021-08-18  8:47   ` Maxime Ripard
2021-08-20  2:43   ` Samuel Holland
2021-08-02  6:22 ` [PATCH 14/17] dt-bindings: arm: sunxi: add compatible strings for Sipeed MaixSense Icenowy Zheng
2021-08-06 21:43   ` Rob Herring
2021-08-18  9:03   ` Maxime Ripard
2021-08-02  6:22 ` [PATCH 15/17] arm64: allwinner: dts: add DTSI file for R329 SoC Icenowy Zheng
2021-08-18  9:01   ` Maxime Ripard
     [not found]     ` <74F51516-2470-4A49-972B-E19D8EDD9A3D@sipeed.com>
2021-08-19  2:32       ` Samuel Holland [this message]
2021-08-20  3:06         ` Samuel Holland
2021-08-25 15:00           ` Maxime Ripard
2021-08-20  2:59   ` Samuel Holland
2021-08-02  6:22 ` [PATCH 16/17] arm64: allwinner: dts: r329: add DTSI file for Sipeed Maix IIA Icenowy Zheng
2021-08-02  6:22 ` [PATCH 17/17] arm64: allwinner: dts: r329: add support for Sipeed MaixSense Icenowy Zheng
2021-08-10 11:04 ` [PATCH 00/17] Basical Allwinner R329 support Ulf Hansson

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