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mkl@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 8AA3858AE05; Thu, 5 Nov 2020 08:07:50 +0000 (UTC) Subject: Re: mcp251xfd on RPi 5.4 downstream To: Patrick Menschel , Drew Fustini Cc: Oliver Hartkopp , linux-can@vger.kernel.org, Josh S References: <41b606d5-5991-4d4f-bd6f-aaaf31cbc9b5@pengutronix.de> <6a7061a4-771d-6703-1e30-273050abfb9d@posteo.de> <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> 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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multipart/mixed; boundary="V5YPvYOIMSjjgv7SRkZQMn0SYPOw7ymPZ"; protected-headers="v1" From: Marc Kleine-Budde To: Patrick Menschel , Drew Fustini Cc: Oliver Hartkopp , linux-can@vger.kernel.org, Josh S Message-ID: Subject: Re: mcp251xfd on RPi 5.4 downstream References: <41b606d5-5991-4d4f-bd6f-aaaf31cbc9b5@pengutronix.de> <6a7061a4-771d-6703-1e30-273050abfb9d@posteo.de> <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> In-Reply-To: --V5YPvYOIMSjjgv7SRkZQMn0SYPOw7ymPZ Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable On 11/2/20 7:47 PM, Patrick Menschel wrote: >>> https://www.waveshare.com/w/upload/e/e2/2-CH-CAN-FD-HAT-Schematic= =2Epdf >>> >>> Grmpf :/ >>> >>>> This means that can1 cs is connected to pi header pin 26=C2=A0 >>> >>> Both of rpi's SPI host drivers prefer to use GPIO chip selects by def= ault, as >>> native chip selects have some limitations. And all three mcp251xfd ov= erlays use >>> GPIO chip selects, this means you can use any free GPIO in the system= for the >>> SPI chip select. >>> >>> Marc >>> >> >> It took me a while to realize but those pin numbers on the PCB are >> WPI :=3D WiringPi numbers, not header pin numbers and not BCM pin numb= ers. >> >> The schematics also has the WPI column in the lower left section. >> >> https://pinout.xyz/pinout/wiringpi# >> >> -- >> Patrick >> >=20 > It may be a blunt guess, but according to page 99 >=20 > https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711/= rpi_DATA_2711_1p0.pdf >=20 > Pin 26 is pulldown. So it works if it remains unused because the pin is= > input with pulldown thus the chip is selected by default. >=20 > I don't know if the CE pin can actually work if there is no matching al= t > function in pinselect register. Both rpi SPI drivers don't use native chip selects, they use GPIOs. This = means you can use any gpio as chip select. This is why this setup works. 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 | --V5YPvYOIMSjjgv7SRkZQMn0SYPOw7ymPZ-- --QzS6uyRUGRgGCasRCZShvlXIL7SnekXIt Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl+jstIACgkQqclaivrt 76l8XQgAlquuDvlr3IQ7Om8N7n8aacq9HKppYwhDcEcaWAOSuQLXtyqei5VmnlKn Qj3clDhLCIhir2Rm1XG4o/gS46riR8BWjsnbnQD7sFUC9FRo4szdnAmI+Z2YNAxU X+dIevElC9Fl59dDlYRcwnfrKInryFuB99xfLDxXTQUm5uNJrcGVCtQV5h984ZeS jJxItpsXCtkaGN7S+ZmbM6fdytffBqjFQt6atyBUe5aYBSgqQAzmFAOrYUPG65yt A0NgAb253J9W3TOlpLWqxH5yTjZyRyyw1dT+13KsWEB/D2UjXxxwBD/45PVdwkY+ tbzsVR+FR58dO4hBRC58fFZqqFBb+A== =hxiz -----END PGP SIGNATURE----- --QzS6uyRUGRgGCasRCZShvlXIL7SnekXIt--