[{"id":3678068,"web_url":"http://patchwork.ozlabs.org/comment/3678068/","msgid":"<20260416100354ac85cb48@mail.local>","list_archive_url":null,"date":"2026-04-16T10:03:54","subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","submitter":{"id":73377,"url":"http://patchwork.ozlabs.org/api/people/73377/","name":"Alexandre Belloni","email":"alexandre.belloni@bootlin.com"},"content":"On 16/04/2026 02:57:05-0700, Adriana Stancu wrote:\n> Add a configurable \"ti,read-settle-us\" property to resolve a limitation\n> where aggressive I2C polling prevents the BQ32000's internal register to\n> update. This ensures the hardware has sufficient idle time to update its\n> buffer, preventing stale data reads on systems where the \"interrupts\" are\n> not configured.\n> \n\nWhy does it need to be configured?","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-rtc@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=bootlin.com header.i=@bootlin.com header.a=rsa-sha256\n header.s=dkim header.b=qyK79Tbv;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-rtc+bounces-6353-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com\n header.b=\"qyK79Tbv\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=185.246.85.4","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=bootlin.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=bootlin.com"],"Received":["from sin.lore.kernel.org (sin.lore.kernel.org\n [IPv6:2600:3c15:e001:75::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxDBW6CSDz1yDF\n\tfor ; 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a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim;\n\tt=1776333836; h=from:subject:date:message-id:to:cc:mime-version:content-type:\n\t in-reply-to:references; bh=jz6qYFKNci22zxAWa0vLjki+Xbsl10MmWaT9hS9sWNc=;\n\tb=qyK79Tbv0He5cPPGsSwcn+lVCvXGjTmv3N4N7u/qDZhmFp+hbI8pLmW9mcWyLOd2VyN+14\n\txaoZrDsp/5wI4SSW45AJnwFEWEQOVHHRb0CE3upt71IMae6Pc0F7VTF2Iar2k3B9wmNk/1\n\tM3tIqi0ZASnSivJh5CEzgxo4Ft5/fHpTAT3m+mCW4Miqm29cFvvFaDIlwWjOeIygWhtMSn\n\tokX4uO2v2SidwDQyrLSFNUlJLru3RTjyLVjh/nYirnb9UIKwr02CvoU/KDpE27Zb5QShtF\n\ttNaWz7Fk9leY572KbswxsrSXuyN0peDtinPIJd7OOcSh5Uk9fvGrwL9Y/pH/EA==","Date":"Thu, 16 Apr 2026 12:03:54 +0200","From":"Alexandre Belloni ","To":"Adriana Stancu ","Cc":"linux-rtc@vger.kernel.org, devicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org,\n\tconor+dt@kernel.org","Subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","Message-ID":"<20260416100354ac85cb48@mail.local>","References":"<20260416092414.3210383-1-adriana@arista.com>\n <20260416095706.3212158-1-adriana@arista.com>\n <20260416095706.3212158-2-adriana@arista.com>","Precedence":"bulk","X-Mailing-List":"linux-rtc@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260416095706.3212158-2-adriana@arista.com>","X-Last-TLS-Session-Version":"TLSv1.3"}},{"id":3678082,"web_url":"http://patchwork.ozlabs.org/comment/3678082/","msgid":"","list_archive_url":null,"date":"2026-04-16T10:33:11","subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","submitter":{"id":91944,"url":"http://patchwork.ozlabs.org/api/people/91944/","name":"Adriana Stancu","email":"adriana@arista.com"},"content":"On Thu, Apr 16, 2026 at 1:03 PM Alexandre Belloni\n wrote:\n>\n> On 16/04/2026 02:57:05-0700, Adriana Stancu wrote:\n> > Add a configurable \"ti,read-settle-us\" property to resolve a limitation\n> > where aggressive I2C polling prevents the BQ32000's internal register to\n> > update. This ensures the hardware has sufficient idle time to update its\n> > buffer, preventing stale data reads on systems where the \"interrupts\" are\n> > not configured.\n> >\n>\n> Why does it need to be configured?\n>\nIn my testing on a 100kHz bus, 2ms was the stable value that resolved\nthe issue with the hwclock version I tested.\nBut it might be a delay too long for other systems becuase the\nrequired \"settle\" time may vary depending on the I2C bus speed and how\nfast the userspace is polling.\nI chose to make it configurable to avoid forcing an empirical value on\nall systems, especially those where a shorter delay might work, or\nwhere the interrupt line is properly connected and no polling is\nneeded.\n\nIf you prefer, I can change this to a fixed specific delay in the\ndriver instead of a device tree property, but I thought a configurable\nvalue was more flexible for different board designs.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-rtc@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=arista.com header.i=@arista.com header.a=rsa-sha256\n header.s=google header.b=B9BM1rtF;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Thu, 16 Apr 2026\n 03:33:22 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-rtc@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260416092414.3210383-1-adriana@arista.com>\n <20260416095706.3212158-1-adriana@arista.com>\n <20260416095706.3212158-2-adriana@arista.com>\n <20260416100354ac85cb48@mail.local>","In-Reply-To":"<20260416100354ac85cb48@mail.local>","From":"Adriana Nicolae ","Date":"Thu, 16 Apr 2026 13:33:11 +0300","X-Gm-Features":"AQROBzAX-RAhjw4JwkHHyO2XcSkeiIxM2zy7fbiV7Qac4LnF7Shh7IHBsR9v2qo","Message-ID":"\n ","Subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","To":"Alexandre Belloni ","Cc":"linux-rtc@vger.kernel.org, devicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org,\n\tconor+dt@kernel.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}},{"id":3678090,"web_url":"http://patchwork.ozlabs.org/comment/3678090/","msgid":"<89bb6063-d473-498e-bca5-0185325608c3@kernel.org>","list_archive_url":null,"date":"2026-04-16T11:00:26","subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","submitter":{"id":68952,"url":"http://patchwork.ozlabs.org/api/people/68952/","name":"Krzysztof Kozlowski","email":"krzk@kernel.org"},"content":"On 16/04/2026 11:57, Adriana Stancu wrote:\n> Add a configurable \"ti,read-settle-us\" property to resolve a limitation\n> where aggressive I2C polling prevents the BQ32000's internal register to\n> update. This ensures the hardware has sufficient idle time to update its\n> buffer, preventing stale data reads on systems where the \"interrupts\" are\n> not configured.\n\nAnd why does the value different between each board layouts? Same\ndevice, different board and you need different value?\n\nDo not attach (thread) your patchsets to some other threads (unrelated\nor older versions). This buries them deep in the mailbox and might\ninterfere with applying entire sets. See also:\nhttps://elixir.bootlin.com/linux/v6.16-rc2/source/Documentation/process/submitting-patches.rst#L830\n\nBest regards,\nKrzysztof","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-rtc@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=fOsMoLtU;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-rtc+bounces-6355-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"fOsMoLtU\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxFSs0Pfnz1yDF\n\tfor ; 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charset=UTF-8","Content-Transfer-Encoding":"7bit"}},{"id":3678098,"web_url":"http://patchwork.ozlabs.org/comment/3678098/","msgid":"","list_archive_url":null,"date":"2026-04-16T11:14:47","subject":"Re: [PATCH v2 1/2] dt-bindings: rtc: ti,bq32k: Add delay on rtc reads","submitter":{"id":91944,"url":"http://patchwork.ozlabs.org/api/people/91944/","name":"Adriana Stancu","email":"adriana@arista.com"},"content":"On Thu, Apr 16, 2026 at 2:00 PM Krzysztof Kozlowski wrote:\n>\n> On 16/04/2026 11:57, Adriana Stancu wrote:\n> > Add a configurable \"ti,read-settle-us\" property to resolve a limitation\n> > where aggressive I2C polling prevents the BQ32000's internal register to\n> > update. This ensures the hardware has sufficient idle time to update its\n> > buffer, preventing stale data reads on systems where the \"interrupts\" are\n> > not configured.\n>\n> And why does the value different between each board layouts? Same\n> device, different board and you need different value?\n>\n> Do not attach (thread) your patchsets to some other threads (unrelated\n> or older versions). This buries them deep in the mailbox and might\n> interfere with applying entire sets. See also:\n> https://elixir.bootlin.com/linux/v6.16-rc2/source/Documentation/process/submitting-patches.rst#L830\n>\nYou are right, the delay should be specific to the RTC chip, not the\nboard layout. I will drop the dt property and send a v3 that\nimplements a fixed 2ms delay in the driver.\nThis will be applied only when an interrupt is not present, because\nthis is when the userspace will use polling.\n\nBest regards,\nAdriana","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-rtc@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=arista.com header.i=@arista.com header.a=rsa-sha256\n header.s=google header.b=MRv+ziI7;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-rtc+bounces-6356-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=arista.com header.i=@arista.com\n header.b=\"MRv+ziI7\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.160.41","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=arista.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=arista.com"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxFsv6f1gz1yDF\n\tfor ; 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