> MDIO bus controllers are in a similar situation (with Hubert's patch) > but at least there the frame size is fixed and I haven't heard of an > MDIO controller to use DMA. Linux does not have any DMA driver MDIO busses, as far as i know. It does not make sense, since you are only transferring 16bits of data. The vast majority are polled completion, but there is one which generates an interrupt on completion. Andrew
Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
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- Subject: Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Andrew Lunn <andrew@xxxxxxx>
- Date: Mon, 19 Aug 2019 02:43:54 +0200
- Cc: Mark Brown <broonie@xxxxxxxxxx>, Hubert Feurstein <h.feurstein@xxxxxxxxx>, mlichvar@xxxxxxxxxx, Richard Cochran <richardcochran@xxxxxxxxx>, Florian Fainelli <f.fainelli@xxxxxxxxx>, linux-spi@xxxxxxxxxxxxxxx, netdev <netdev@xxxxxxxxxxxxxxx>
- In-reply-to: <CA+h21hrZbun_j+oABJFP+P+V3zHP2x0mAhv-1ocF38miCvZHew@mail.gmail.com>
- References: <20190816004449.10100-1-olteanv@gmail.com> <20190816004449.10100-4-olteanv@gmail.com> <20190816121837.GD4039@sirena.co.uk> <CA+h21hqatTeS2shV9QSiPzkjSeNj2Z4SOTrycffDjRHj=9s=nQ@mail.gmail.com> <20190816125820.GF4039@sirena.co.uk> <CA+h21hrZbun_j+oABJFP+P+V3zHP2x0mAhv-1ocF38miCvZHew@mail.gmail.com>
- User-agent: Mutt/1.5.23 (2014-03-12)
- References:
- [RFC PATCH net-next 00/11] Deterministic SPI latency on NXP
- From: Vladimir Oltean
- [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Vladimir Oltean
- Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Mark Brown
- Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Vladimir Oltean
- Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Mark Brown
- Re: [RFC PATCH net-next 03/11] spi: Add a PTP system timestamp to the transfer structure
- From: Vladimir Oltean
- [RFC PATCH net-next 00/11] Deterministic SPI latency on NXP
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