From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zeus03.de (zeus03.de [194.117.254.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF5F9263C86 for ; Tue, 25 Feb 2025 10:28:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740479320; cv=none; b=u4vm2q5arzLuQpDCgnFyf9n+kbVykcSs50U4Ip+2jBhkkTWeRIfp9e60Jx2YKPAUfkD5rijNGJGPjfJu63gBABmDJPblqBd1WjqJcTpLRVDgOKQYsx8r0pJegsXiOMIErQAaxPhXCeGiwZMrQwiEWRwUrK7jGTN+N3xWpI87V2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740479320; c=relaxed/simple; bh=JWMlVYd/uInmb85Xv2F+lYo7bSzgvrS/Zii2R7JDZaw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Ik8h1ljPURpXLPVWUCj+CltDXRnf7LNLDa9599Fl6+6fhLK48ownbk0RLs5vltEwDMY8xRhABGB155Q54rYQ7h3pBZRmSeMwAgGiPB3xXnewbbcJnXLiLv8N5y5F2OxDGIreXiKUKZ34tm0ypk+CnVrWtea0nIhJoRVNNNPhLAo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=SNbQNzUx; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="SNbQNzUx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to; s=k1; bh=IeDk fJXKEAJ+vddtGIcJ6taHXqMO+FZL7PLiG+JPiOI=; b=SNbQNzUx1wYCy6VMaHKQ gBSJ1Anroy5N9vhN6QHnPD45Y3jCnq2ZU18sKXr2spDYNweuHUGQOVAOH3rpea5A zQznlZxIuUYAkn/Epu6Hp9R5Xg2pvLwMyEIckDuZijx2lZJwUeeXKA7jW0C8eNO7 tbs2ccBK0J6D0IeiZi3eW1HPnunUkT93kjzEgzl0fR6gPtwboyqVnu79mPYkjOkZ uKaVVx4LPgffUGHcszXcgMQ+w2d/g/rqCu4WgUwxPb1Flyb6al6+RF0LJ9USYuxg WkeQGmakTUvXRVAVSRNtwH4XRwuqCLxfCUdKT+xAkM5V/qETGLprK2Ae0Qdvv4MP 8Q== Received: (qmail 179193 invoked from network); 25 Feb 2025 11:28:34 +0100 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 25 Feb 2025 11:28:34 +0100 X-UD-Smtp-Session: l3s3148p1@G8NI6/Qu+KsujnvP Date: Tue, 25 Feb 2025 11:28:34 +0100 From: Wolfram Sang To: Biju Das Cc: "linux-rtc@vger.kernel.org" , Alexandre Belloni , "linux-renesas-soc@vger.kernel.org" , Miquel Raynal , Claudiu Beznea Subject: Re: Q: use 1s irqs to overcome alarm minute granularity? Message-ID: Mail-Followup-To: Wolfram Sang , Biju Das , "linux-rtc@vger.kernel.org" , Alexandre Belloni , "linux-renesas-soc@vger.kernel.org" , Miquel Raynal , Claudiu Beznea References: Precedence: bulk X-Mailing-List: linux-rtc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="OHfPNeMj2FEHK4V9" Content-Disposition: inline In-Reply-To: --OHfPNeMj2FEHK4V9 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Feb 25, 2025 at 10:24:32AM +0000, Biju Das wrote: > + Claudiu, Looks RZ/G3S RTC can handle it. > =E2=97=8F=20 > Periodic interrupt (PRD) > ? 2 seconds, 1 second, 1/2 second, 1/4 second, 1/8 second, 1/16 second, 1= /32 This driver does not have that problem, because the alarms support seconds right away: 408 writeb(RTCA3_AR_ENB | bin2bcd(tm->tm_sec), priv->base += RTCA3_RSECAR); --OHfPNeMj2FEHK4V9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAme9m1IACgkQFA3kzBSg Kba3DQ/7BWBWmpf7kjlOSycgclnAF723JCbINidxcumgGUQeNKXwTv0a1T3Okfnq uy3QRK/iLOa6Kxg7xFdKLJyoleXbeyKwrac1YUfBvuKmTiywiUIPo2ZRf68t0jSL PQ/S1YhBRIMA5jinfCxMhofV4Pyz9ICxIr06a9wLJLcAp/Nxw1LADCoIAyEy8TaE CQNkphixasAGrpv2XneTtYQUK1JeBFk3P3BVkQ1lYPFjJz0vlfxCbK2DqZHFzoOk zKvo65NPi5cAdoRhIxCd3HAyZG+a1ynZig9SPFoOi4RCx2x8qpujBSQBT0BfhLO8 EDn3rWFdtrWLKbxIFVqR2mwWAcW4EaW48Fd1+d19HKP+DWJO1rZX6FDifLhVzOIF Ot9UxKWTfeebxt4JrYHqBRnPwNoGl/SqBx6e8Q3cji+PUw2ewhtvOsxmXWyVKhet 1Gxi1JZJcaXOcAIGQiLZGYBnd35EJCMKjIK11pSVB2gDxy+E789T6pn9qCQ+J/yw H+xMKA0xZjQ5YjYmbDF2sY//nbNBb0mIvnYHoz0OvncF5HBvsXGxYz7wHjaw9eiV lHAiRcB6gijZGlE6halLmb5axDKydBmCyCusxLDC4rtCJLBTCnJYk7eghmMlTQFh CFsQ0Ruoe+KqgYq3Oy320C9lY4W510rQC85v9GWvlYUEDKZTYrs= =dQaj -----END PGP SIGNATURE----- --OHfPNeMj2FEHK4V9--