Re: [RFC PATCH 1/2] spi: Add support for Zynq QSPI controller

From: Harini Katakam
Date: Thu Jul 10 2014 - 05:31:38 EST

Hi Geert,

On Thu, Jul 10, 2014 at 2:48 PM, Geert Uytterhoeven
<geert@xxxxxxxxxxxxxx> wrote:
> Hi Harini,
> On Thu, Jul 10, 2014 at 10:50 AM, Harini Katakam <harinik@xxxxxxxxxx> wrote:
>> + master->flags = SPI_MASTER_QUAD_MODE;
> SPI_MASTER_QUAD_MODE is not one of the SPI_MASTER_* defines
> in include/linux/spi/spi.h?

I'm sorry about that. That flag is unused - will remove this statement.

>> + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
> Your driver advertises Dual/Quad SPI Transfer capabilities, but it doesn't
> check spi_transfer.[tr]x_nbits? How can it determine when to enable Dual/Quad?

Here the driver is just giving information that the controller support it.
The MTD layer enables dual/quad based on what the flash supports; quad
being the first priority
I understand that the spi core reads rx, tx-bus-width property and
master support flags and
performs the necessary checks.

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