From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 599E7C79F81 for ; Mon, 5 Jan 2026 12:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XlU49IOrtIsM79PqyL+OqF75bh3fSZiIHM7UZIY8vuU=; b=wAqHy/BhoENo0H WPPYTN2MIDLmQqCH+J2JDamRBDEKCt6vMwevtgSBR5JAgpzdp0K4ipaaq0N77TUWhSJXDxvodbgC5 isAaVJ//gPnEhYZLm3eLbaApuMqZ7LOMNGGXxTmvOD5TH/ZLS/AQNVnuNo9U6pVVBLzGC0NKjCLGg d8nThsXCY9xDFTzxT2Gr/2tAJHq+RGw1j0r3r5Fk0CBg994GuBaDHHqIcD6IKejX40eTsIFH1VHCd /oa/HoHgUG7wIQlCBpOY8lsCNuWHWDYzI9NRHm771WlZLyJm8raoeTXGUI3vsyB5X5x07HF5QCURj 1nvOJMF8m1FTlD0KrdNw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcjMt-0000000BFBV-0hwz; Mon, 05 Jan 2026 12:07:27 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcjMq-0000000BFB6-0Eqd for linux-riscv@lists.infradead.org; Mon, 05 Jan 2026 12:07:25 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 55A77435C8; Mon, 5 Jan 2026 12:07:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19262C116D0; Mon, 5 Jan 2026 12:07:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767614843; bh=17Md7znlGCVCxY8lL065mnBwNPomhOzbveOzVffThaQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=tp94P2BbJc7iGJa8BkcmjTBirbAK1/bpyfzAExDd4kKi2qRuKMw/ya5Crl8BqkFxQ oUL1LXruZ95N37yu76vv5AIfdTrXT8Grs+Jf1zLUeBco0guYAcpFEWcx+9w88yYp2I Halyk/tYsNBa3PKc4+X3p/KCANhlzj+mdcdBb7rXsCX3oxvHi3OYwMcCtbNhlE7wNo d6fe1BVywIV8xryhJJWmNWH/bs6y2Y4ENSnO25cxTQOxy+9IrAARqCtJ3Y4U/LP2Q0 XHeHpPhfhHedqBfJHTIqfeR8kO7ENwYL/Q8cSv5G5GKsYQXSyRNwg3Swh5HLpR0sl3 cBfPn6+T06PlA== Message-ID: Date: Mon, 5 Jan 2026 13:07:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] riscv: dts: sophgo: enable hardware clock (RTC) on the Milk-V Pioneer To: Michael Orlitzky , unicorn_wang@outlook.com, inochiama@gmail.com Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, devicetree@vger.kernel.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org References: <20260105120129.58895-1-michael@orlitzky.com> <20260105120129.58895-2-michael@orlitzky.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 05/01/2026 13:01, Michael Orlitzky wrote: > These boards have a working hardware clock if you put a CR-1220 > battery in them. Let's enable it: > > 1. Enable the (already defined) i2c0 by overriding the default > status = "disabled" with "okay". Do not describe the diff. This is obvious. Explain WHY you are doing all this. > > 2. Define the rtc on &i2c0. This is more or less the example from the > documentation (devicetree/bindings/rtc/rtc-ds1307.yaml), and it was > present in the same form in an earlier 6.1.x vendor kernel. > > 3. Copy the pinctrl stuff from &i2c1 and update the PINMUX constants > with the IIC0 values from dt-bindings/pinctrl/pinctrl-sg2042.h. Drop, irrelevant. > > Afterwards, the new I2C and RTC can be enabled with, > > * CONFIG_I2C_DESIGNWARE_CORE=y > * CONFIG_I2C_DESIGNWARE_PLATFORM=y > * CONFIG_RTC_DRV_DS1307=y Drop, irrelevant. You describe here hardware, not Linux kernel config. > > The new I2C should appear under /sys/devices/platform/soc, and with > any luck you'll have a clock the next time you boot: > > [ T367] rtc-ds1307 5-0068: registered as rtc0 > [ T367] rtc-ds1307 5-0068: setting system clock to ... Drop, obvious. > > Signed-off-by: Michael Orlitzky > --- > .../boot/dts/sophgo/sg2042-milkv-pioneer.dts | 21 +++++++++++++++++++ > 1 file changed, 21 insertions(+) > Best regards, Krzysztof _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv