From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: PCF8563 doesn't pass validation check Date: Wed, 2 Jul 2008 11:34:55 +0200 Message-ID: <200807021134.59668.laurentp@cse-semaphore.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2119053514055701885==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: i2c-bounces-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org Errors-To: i2c-bounces-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org To: rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Cc: a.zummo-BfzFCNDTiLLj+vYz1yj4TQ@public.gmane.org, i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org List-Id: linux-i2c@vger.kernel.org --===============2119053514055701885== Content-Type: multipart/signed; boundary="nextPart29637863.OIjQ6mEHTu"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart29637863.OIjQ6mEHTu Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi everybody, I'm having issues with the PCF8563 RTC chip. The Linux driver tries to validate the chip by checking if the BCD-coded ti= me and date registers contain valid values. When a low voltage condition is detected, the registers are not guaranteed = to contain valid values. Experimentation showed that while the seconds, min= utes, hours and day of the week registers didn't cause any issue, the month= s register could get out of the 01-12 range. Has anyone experienced the same issue ? Would it be acceptable to remove th= e months register check ? I've contacted NXP to get more information about what the chip guarantees a= nd what it doesn't. I haven't had any answer yet but I expect them to tell = me there is no guarantee at all. Best regards, =2D-=20 Laurent Pinchart CSE Semaphore Belgium Chaussee de Bruxelles, 732A B-1410 Waterloo Belgium T +32 (2) 387 42 59 =46 +32 (2) 387 42 75 --nextPart29637863.OIjQ6mEHTu Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) iEYEABECAAYFAkhrS8MACgkQ8y9gWxC9vpeJGACePhKnefk0dpa5LlyqZ8nvh0q7 Nf8AnRC48dA4Hbj9IVojxKOd4+SYp/+l =9iHm -----END PGP SIGNATURE----- --nextPart29637863.OIjQ6mEHTu-- --===============2119053514055701885== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ i2c mailing list i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org http://lists.lm-sensors.org/mailman/listinfo/i2c --===============2119053514055701885==--