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([2a01:e0a:106d:1080:6674:33bf:38d6:bc10]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48dfd5033a2sm21249024f8f.45.2026.10.19.00.29.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2026 00:29:08 -0700 (PDT) Message-ID: <0b5c28f0-0a43-42b3-a07e-4ecf39b2380d@linaro.org> Date: Mon, 19 Oct 2026 09:29:07 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: Neil Armstrong Subject: Re: [PATCH] arm64: dts: amlogic: odroid-go-ultra: use the RK818 RTC as rtc0 To: Shigeaki Asai , Kevin Hilman Cc: Jerome Brunet , Martin Blumenstingl , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20261017110743.3555391-1-y-asai.0816@docomonet.jp> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20261017110743.3555391-1-y-asai.0816@docomonet.jp> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 10/17/26 13:07, Shigeaki Asai wrote: > The ODROID-GO Ultra has two PMICs with an RTC each, RK818 and RK817, > and the SoC has the meson virtual RTC. Only vrtc has an alias, rtc0. > > An RTC without an alias takes the lowest free number, and the RK817 > RTC registers early, so it usually becomes rtc0, the RTC the system > time is set from at boot. The RK817 RTC seems to run without a 32kHz > crystal on this board: it ran about 1.5% fast while the board was on > and 14-17% slow while it was off. The RK818 RTC keeps time well: > with it as rtc0, the clock was off by less than a second after the > board was off, with no charger connected, for 12 hours 40 minutes. > > Use the RK818 RTC as rtc0, and give the other two RTCs an alias as > well, so that the numbering does not depend on probe order. > > Fixes: 62e73f000696 ("arm64: dts: amlogic: add initial Odroid Go Ultra DTS") > Assisted-by: claude-opus-5-5 > Signed-off-by: Shigeaki Asai > --- > arch/arm64/boot/dts/amlogic/meson-g12b-odroid-go-ultra.dts | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-go-ultra.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-go-ultra.dts > index 348baa4e6d84..86902f68d7d4 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-go-ultra.dts > +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-go-ultra.dts > @@ -18,7 +18,9 @@ / { > > aliases { > serial0 = &uart_AO; > - rtc0 = &vrtc; > + rtc0 = &rk818; > + rtc1 = &vrtc; > + rtc2 = &rk817; The vrtc was used as rtc0 because it's the defaut wakeup rtc, can the rk818 and rk817 wakeup the system when in system suspend ? Neil > }; > > adc-joystick-left {