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([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-59301f60ca4sm3577871e87.62.2025.10.28.23.24.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Oct 2025 23:24:15 -0700 (PDT) Message-ID: <3d58eb1e-7889-48c3-980b-bd2a98368a3e@gmail.com> Date: Wed, 29 Oct 2025 08:24:14 +0200 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/15] dt-bindings: Add trickle-charge upper limit To: Krzysztof Kozlowski Cc: Matti Vaittinen , Lee Jones , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sebastian Reichel , Liam Girdwood , Mark Brown , Michael Turquette , Stephen Boyd , Linus Walleij , Bartosz Golaszewski , Andreas Kemnade , Alexandre Belloni , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-rtc@vger.kernel.org References: <20251029-adamant-mamba-of-patience-cddb65@kuoka> Content-Language: en-US, en-AU, en-GB, en-BW From: Matti Vaittinen In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 29/10/2025 08:17, Krzysztof Kozlowski wrote: > On 29/10/2025 07:03, Krzysztof Kozlowski wrote: >> On Mon, Oct 27, 2025 at 01:45:05PM +0200, Matti Vaittinen wrote: >>> Some of the chargers for lithium-ion batteries use a trickle-charging as >>> a first charging phase for very empty batteries, to "wake-up" the battery. >> >> In the few cases I was dealing with charging circuits, trickle charging >> was used in context of top-off charging, so when battery is 100%. It's >> also documented at Wiki like that: >> https://en.wikipedia.org/wiki/Trickle_charging >> >>> Trickle-charging is a low current, constant current phase. After the >>> voltage of the very empty battery has reached an upper limit for >>> trickle charging, the pre-charge phase is started with a higher current. >>> >>> Allow defining the upper limit for trickle charging voltage, after which >>> the charging should be changed to the pre-charging. >> >> pre-charging is the trickle charging, no? Or you want to say that >> trickle-charging is pre-pre-charging? But then what is pre-charging in >> this binding? > > > Now I see that you added initial trickle-charging in commit > e3420b49949c79d6182dd8128fa7a3958da01b07. I looked at TI chargers for > LiIon/LiPo batteries and few popular models use the same meaning/cycles > as you here. Probably in LiIon/LiPo you cannot or should not use trickle > for top-off charging (CV phase). > > For NiMh these TI chargers use term "Trickle Maintenance Charge" (e.g. > bq24400), so in separate or this patch please also clarify the > description of properties that this is trickle-charging for LiIon/LiPo > batteries, so the pre-pre charging. Right. I'll try improving the description. Thanks! > > Best regards, > Krzysztof