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Groups > linux.kernel > #1222271
| From | Martin Sperl <kernel@martin.sperl.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi |
| Date | 2015-09-10 18:00 +0200 |
| Message-ID | <q7cqt-5Zm-1@gated-at.bofh.it> (permalink) |
| References | <q4VN8-6Mk-3@gated-at.bofh.it> <q6CGm-5cz-3@gated-at.bofh.it> <q7cgO-5NY-27@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
> On 10.09.2015, at 17:48, Noralf Trønnes <noralf@tronnes.org> wrote: > > This looks interesting. > But there's a challenge with the uart1 and the 8250 driver. > > Phil Elwell has this to say: > This means that that UART1 isn't an exact clone of a 8250 UART. > In a particular, the clock divisor is calculated differently. > A standard 8250 derives the baud rate as clock/(divisor16), > whereas the BCM2835 mini UART uses clock/(divisor8). This means > that if you want to use the standard driver then you need to lie > about the clock frequency, providing a value is twice the real > value, in order for a suitable divisor to be calculated. > > Ref: https://github.com/raspberrypi/linux/pull/1008#issuecomment-139234607 > > So either we need a new uart1 driver or a doubled clock freq. somehow. Found out the same thing and communicated it to Eric - not knowing about the different divider… Martin-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Eric Anholt <eric@anholt.net> - 2015-09-09 03:50 +0200
Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Alexander Stein <alexanders83@web.de> - 2015-09-09 11:10 +0200
Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Eric Anholt <eric@anholt.net> - 2015-09-09 20:30 +0200
Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Noralf Trønnes <noralf@tronnes.org> - 2015-09-10 17:50 +0200
Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Martin Sperl <kernel@martin.sperl.org> - 2015-09-10 18:00 +0200
Re: [PATCH v5 0/6] bcm2835: auxiliar device support for spi Phil Elwell <phil@raspberrypi.org> - 2015-09-10 19:10 +0200
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