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linux-arm-kernel@lists.infradead.org References: <20260909141300.1368790-1-sander.speetjens@gmail.com> <20260909141300.1368790-2-sander.speetjens@gmail.com> <4c237cd8-024f-405e-a00e-e22ff9529d08@kernel.org> <8cd19ae8-372b-444b-bd2a-dc01221b5896@kernel.org> <718e88b8-3f3b-410e-8e76-90c370ff920a@kernel.org> Content-Language: en-US From: Stefan Wahren Autocrypt: addr=wahrenst@gmx.net; keydata= xjMEZ1dOJBYJKwYBBAHaRw8BAQdA7H2MMG3q8FV7kAPko5vOAeaa4UA1I0hMgga1j5iYTTvN IFN0ZWZhbiBXYWhyZW4gPHdhaHJlbnN0QGdteC5uZXQ+wo8EExYIADcWIQT3FXg+ApsOhPDN NNFuwvLLwiAwigUCZ1dOJAUJB4TOAAIbAwQLCQgHBRUICQoLBRYCAwEAAAoJEG7C8svCIDCK JQ4BAP4Y9uuHAxbAhHSQf6UZ+hl5BDznsZVBJvH8cZe2dSZ6AQCNgoc1Lxw1tvPscuC1Jd1C TZomrGfQI47OiiJ3vGktBc44BGdXTiQSCisGAQQBl1UBBQEBB0B5M0B2E2XxySUQhU6emMYx f5QR/BrEK0hs3bLT6Hb9WgMBCAfCfgQYFggAJhYhBPcVeD4Cmw6E8M000W7C8svCIDCKBQJn V04kBQkHhM4AAhsMAAoJEG7C8svCIDCKJxoA/i+kqD5bphZEucrJHw77ujnOQbiKY2rLb0pE aHMQoiECAQDVbj827W1Yai/0XEABIr8Ci6a+/qZ8Vz6MZzL5GJosAA== In-Reply-To: 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1/y+hIwT2FXigUZpdyOFosTQDTmK9jxXT9oJ0lqkk1hsAK4aK7zfzQQTkdiZDXzdH7otMKZob 2Ssu9bqQfXx7loHXyUne9tLzAI9zyl/DbuFQ/sa3WFY9vqAofQMcE9LF53az+FHXQhWe9q6fe xUHCXPhWMLsBFs0yv/SaktR+p0cXNnUBmGhtAxtDTbig== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260910_173338_263274_B46A1970 X-CRM114-Status: GOOD ( 15.99 ) 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 Am 10.09.26 um 09:08 schrieb Krzysztof Kozlowski: > On 09/09/2026 22:24, Sander Speetjens wrote: >> Thanks for your response >> >>> And more important, where is any interface to actually control the RTC= ? >>> I see nothing, so your firmware is? Then this is not a separate device >>> and you just added DTS for your driver, which is a no go (see writing >>> bindings). >> The RTC is a physical, battery-backed RTC, but the Raspberry Pi firmwar= e >> exposes its register interface exclusively through the firmware mailbox= . >> I initially used a firmware phandle so the RTC driver could obtain the >> existing rpi_firmware instance. FWIW Based on the official announcement [1], the Renesas DA9091 is a=20 PMIC which has been customized for Raspberry Pi. So currently there is=20 no datasheet available (yet). But it's very likely that the GPU firmware of the BCM2712 communicate=20 via I2C with this PMIC. Also this IC offers additional features like RTC= =20 and power button. So this driver only handles the RTC part. Best regards [1] - https://www.raspberrypi.com/news/introducing-raspberry-pi-5/ >> >> Based on your comment, I think it is more appropriate to model >> the RTC as a child device of rpi-firmware, >> referencing to the existing firmware clock/reset/power services, >> and have the driver obtain the firmware interface from its parent >> rather than adding a phandle solely for driver plumbing. >> Which also means moving this to arm/bcm/raspberrypi,bcm2835-firmware.ya= ml >> > Whether device has separate node, depends on it having dedicated > resources. I don't see such here, so unlikely it should have a node in > the first place (see writing bindings or DTS101 where exactly this > question is asked). > > Best regards, > Krzysztof