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[212.71.14.70]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49fcd2f7ef3sm10168685e9.0.2026.09.18.12.33.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Sep 2026 12:33:10 -0700 (PDT) Message-ID: <74d59f1e-479a-495e-8413-51e1feca78f5@gmail.com> Date: Fri, 18 Sep 2026 21:33:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/2] dt-bindings: rtc: Add property for Raspberry Pi 5 RTC To: Stefan Wahren , Krzysztof Kozlowski Cc: Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Jonathan Bell , linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org References: <20260917135841.841680-1-sander.speetjens@gmail.com> <20260917135841.841680-2-sander.speetjens@gmail.com> <20260918-steadfast-unselfish-loris-996d7d@quoll> Content-Language: en-US From: Sander Speetjens In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260918_123313_446677_0D074D00 X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > On 9/18/26 15:27, Stefan Wahren wrote: >> Am 18.09.26 um 13:44 schrieb Krzysztof Kozlowski: >>> On Thu, Sep 17, 2026 at 03:58:40PM +0200, Sander Speetjens wrote: >>>> Add trickle-voltage-millivolt property for the Raspberry Pi 5 RTC. >>> Why? Describe the hardware, the need, not the diff. >> Is this something we can avoid by making this configurable via >> userspace / hw_clock --param-set=parameter=value ? I think it would be handy to have both. A cm5 board designer could choose to have a super-cap or lithium ion cell and for that a device-tree property would be handy for it is always the same. But for a user attachable battery on the pi 5b via headers or soldering the userspace version would be easier.