Re: [PATCH v3 15/15] spi: qup: support for qup v1 dma

Varadarajan Narayanan
2017-06-27T09:36:46Z

Rob,

On Fri, Jun 23, 2017 at 04:49:23PM -0500, Rob Herring wrote:
> On Tue, Jun 20, 2017 at 02:40:57PM +0530, Varadarajan Narayanan wrote:
> > Currently the QUP Version v1 does not work with DMA so added
> > the support for the same.
> >
> > 1. It uses ADM DMA which requires TX and RX CRCI
> > 2. DMA channel initialization need to be done after setting
> > block size for having valid values in maxburst
> > 3. QUP mode should be DMOV instead of BAM.
> >
> > Signed-off-by: Abhishek Sahu <absahu-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> > Signed-off-by: Varadarajan Narayanan <varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> > ---
> > .../devicetree/bindings/spi/qcom,spi-qup.txt | 6 ++++
> > drivers/spi/spi-qup.c | 35 +++++++++++++++++-----
> > 2 files changed, 34 insertions(+), 7 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> > index 5c09077..e754181 100644
> > --- a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> > +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> > @@ -38,6 +38,12 @@ Optional properties:
> > - dma-names: Names for the dma channels, if present. There must be at
> > least one channel named "tx" for transmit and named "rx" for
> > receive.
> > +- qcom,tx-crci: Identificator for Client Rate Control Interface (CRCI) to be
>
> Identificator is not a word.
>
> This sounds like something that should be a cell in the dmas property.

I will hold this patch for now. This depends on the ADM driver, which
is not upstreamed yet. Will incorporate your feedback and re-post the
patch later.

Thanks
Varada

> > + used with TX DMA channel. Required when using DMA for
> > + transmission with QUP Version 1 i.e qcom,spi-qup-v1.1.1.
> > +- qcom,rx-crci: Identificator for Client Rate Control Interface (CRCI) to be
> > + used with RX DMA channel. Required when using DMA for
> > + receiving with QUP Version 1 i.e qcom,spi-qup-v1.1.1.
> >
> > SPI slave nodes must be children of the SPI master node and can contain
> > properties described in Documentation/devicetree/bindings/spi/spi-bus.txt

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