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 X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CE7EC00A89 for ; Thu, 5 Nov 2020 07:15:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22D482080D for ; Thu, 5 Nov 2020 07:15:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726787AbgKEHPd (ORCPT ); Thu, 5 Nov 2020 02:15:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with 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mkl@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 7B63358AD8B; Thu, 5 Nov 2020 07:15:24 +0000 (UTC) Subject: Re: mcp251xfd on RPi 5.4 downstream To: Patrick Menschel , drew@beagleboard.org Cc: socketcan@hartkopp.net, linux-can@vger.kernel.org, josh@macchina.cc References: <3d19330b-860b-7d76-bc6d-768a7b00ed4b@pengutronix.de> <3a5f81d6-13ba-71b8-67a7-fe6e8a13f84a@posteo.de> <3b7b6353-0493-210a-7c14-e7ccc1067365@pengutronix.de> <08a1fb36-5efb-27d8-f5b9-bd2a923479a2@pengutronix.de> <9e9db79d-9357-19bd-0584-3f97ed49c731@posteo.de> <27b696e7-2c05-e8f3-ca3e-d30ceb11a818@posteo.de> <1082be86-50d6-40f3-ec44-18d389fd9245@posteo.de> From: Marc Kleine-Budde Autocrypt: addr=mkl@pengutronix.de; prefer-encrypt=mutual; keydata= mQINBFFVq30BEACtnSvtXHoeHJxG6nRULcvlkW6RuNwHKmrqoksispp43X8+nwqIFYgb8UaX zu8T6kZP2wEIpM9RjEL3jdBjZNCsjSS6x1qzpc2+2ivjdiJsqeaagIgvy2JWy7vUa4/PyGfx QyUeXOxdj59DvLwAx8I6hOgeHx2X/ntKAMUxwawYfPZpP3gwTNKc27dJWSomOLgp+gbmOmgc 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OpenPGP/MIME signed message (RFC 4880 and 3156) --4BQW3ThGatcIZm5tBulmPWPlLacvYtUIX Content-Type: multipart/mixed; boundary="GQT9BL9og1ZX66OeS1jpu884h6xUu2W8V"; protected-headers="v1" From: Marc Kleine-Budde To: Patrick Menschel , drew@beagleboard.org Cc: socketcan@hartkopp.net, linux-can@vger.kernel.org, josh@macchina.cc Message-ID: <8bf56109-5e53-ca76-c022-99cf867322a6@pengutronix.de> Subject: Re: mcp251xfd on RPi 5.4 downstream References: <2593d8e0-2d42-0461-e2e1-86a71b415476@pengutronix.de> <3d19330b-860b-7d76-bc6d-768a7b00ed4b@pengutronix.de> <3a5f81d6-13ba-71b8-67a7-fe6e8a13f84a@posteo.de> <3b7b6353-0493-210a-7c14-e7ccc1067365@pengutronix.de> <08a1fb36-5efb-27d8-f5b9-bd2a923479a2@pengutronix.de> <9e9db79d-9357-19bd-0584-3f97ed49c731@posteo.de> <27b696e7-2c05-e8f3-ca3e-d30ceb11a818@posteo.de> <1082be86-50d6-40f3-ec44-18d389fd9245@posteo.de> In-Reply-To: <1082be86-50d6-40f3-ec44-18d389fd9245@posteo.de> --GQT9BL9og1ZX66OeS1jpu884h6xUu2W8V Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 11/4/20 7:48 PM, Patrick Menschel wrote: > Hi, >=20 > I can confirm it works on a Pi 0w too. >=20 > pi@rpi-0w-1:~ $ dmesg | grep -Ei can\|spi > [ 29.478369] CAN device driver interface > [ 29.615519] spi_master spi0: will run message pump with realtime pri= ority > [ 29.660342] mcp251xfd spi0.0 can0: MCP2517FD rev0.0 (-RX_INT > +MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:10.00MHz > r:10.00MHz e:0.00MHz) successfully initialized. >=20 > Its just a bread board install and I had to reduce the Spi-Max-Frequenc= y > due to 10cm long cables. It least I believe it's the cable length. What happens if you don't reduce the SPI frequency? Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --GQT9BL9og1ZX66OeS1jpu884h6xUu2W8V-- --4BQW3ThGatcIZm5tBulmPWPlLacvYtUIX Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl+jpoUACgkQqclaivrt 76mqfgf+PJwPDIhipUbeARsJimHFASMbHC3rPj7zGAVrdbZoL8GH5sCe2MMJWcS2 iCEek5w3wGIAApUaxO+sU9xvE3un3j1YRgVnP/1lY3Auxx3VemIZQXxZ9jJCRMUz oqQlDM94prK/IFRtoRWZgCRlqOoABIQZWoCAx6gTAGMNAJ15GNT2uEDkJeBTc3qK w4724Kv+ik8CL0drHKpaVRlXeB13Ch1B/coalD5NCHVvpbS/WfwPggrRR/3sE5XW uidxgpBaaP+SrWfZ+ma3HT3RjntC4zNdjr+tAjXaieQXyJrE3fX1yS8FufCbqW1G CHFttogOkDNhOsJqEPeg+gWgjuUO8g== =1haF -----END PGP SIGNATURE----- --4BQW3ThGatcIZm5tBulmPWPlLacvYtUIX--