Re: [PATCH v3 15/15] spi: qup: support for qup v1 dma
From: Rob Herring
Date: Fri Jun 23 2017 - 17:49:33 EST
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@xxxxxxxxxxxxxx>
> Signed-off-by: Varadarajan Narayanan <varada@xxxxxxxxxxxxxx>
> .../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
> +- 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.
> + 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