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Tue, 20 Oct 2026 12:29:26 -0700 (PDT) Received: from localhost ([103.239.146.42]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36741e71eaesm1049611eec.26.2026.10.20.12.29.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Oct 2026 12:29:25 -0700 (PDT) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 21 Oct 2026 00:59:15 +0530 Message-Id: Cc: "Douglas Anderson" , "Neil Armstrong" , "Jessica Zhang" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Simona Vetter" , "Bjorn Andersson" , "Konrad Dybcio" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , , <~postmarketos/upstreaming@lists.sr.ht>, , , , , , "Jasper Korten" , "Federico Amedeo Izzo" , "Luca Weiss" , "Hans de Goede" Subject: Re: [PATCH 3/3] arm64: dts: qcom: Add Samsung Galaxy Book2 Go From: "Luca Weiss" To: "Konrad Dybcio" , "Luca Weiss" , "Dmitry Baryshkov" X-Mailer: aerc 0.22.0-0-gc2f86b7abde3-dirty References: <20261012-book2go-v1-0-7188e7ea7a15@fairphone.com> <20261012-book2go-v1-3-7188e7ea7a15@fairphone.com> In-Reply-To: On Tue Oct 20, 2026 at 1:05 PM IST, Konrad Dybcio wrote: > On 10/14/26 9:13 AM, Luca Weiss wrote: >> On Wed Oct 14, 2026 at 3:28 AM CEST, Dmitry Baryshkov wrote: >>> On Tue, Oct 13, 2026 at 12:17:05PM +0200, Luca Weiss wrote: >>>> On Tue Oct 13, 2026 at 12:10 PM CEST, Konrad Dybcio wrote: >>>>> On 10/12/26 8:11 PM, Luca Weiss wrote: >>>>>> From: Jasper Korten > > [...] > > >>>>> I'm assuming there's no pmic-glink on this device? >>>> >>>> I'm not quite sure yet how the USB stuff works. For sure from >>>> observation, USB-C only works when stuff was plugged-in at boot time >>>> (UEFI?), and charger also only supplies any power (but not actually >>>> charging) when plugged in at boot time. >>> >>> This means that something is not 100% correct, for example, missing EC >>> support. >>=20 >> For sure some bits are missing. This laptop doesn't have an EC per-se, >> it's got a "EMEC" - Emulated EC, where on Windows there's just a bunch >> of drivers handling EC-like functionality. >>=20 >> So e.g. already for battery, we just talk with the sbs-battery directly. >> I assume this will be the case for the other components on this laptop >> as well. > > I guess sweeping the i2c busses would be a good start. The other day We have one list of I2C devices from ACPI description, and a different list from i2cdetect. They overlap to a certain extent but also have enough bits that differ for some reason. > we got a contribution for a SM8550-based Samsung tablet which also > didn't have pmic-glink, but used a SM5714 IC instead: Interesting, will keep that in mind. Difficult to figure out what an I2C chip is based on just the address and potentially basic register reads. Downstream Linux devicetree would help where it's not just an obscure "EMEC" device with a million I2C addresses in ACPI. Regards Luca > > https://lore.kernel.org/linux-arm-msm/f7ba4d5a-0e8c-417d-a1fd-5b5e392df71= a@dxdmail.cc/ > > Konrad