HI Greet, >-----Original Message----- >From: Harini Katakam [mailto:harinikatakamlinux@xxxxxxxxx] >Sent: Thursday, July 10, 2014 3:01 PM >To: Geert Uytterhoeven >Cc: Mark Brown; Grant Likely; Rob Herring; Pawel Moll; Mark Rutland; Ian >Campbell; Kumar Gala; linux-spi; linux-kernel@xxxxxxxxxxxxxxx; >devicetree@xxxxxxxxxxxxxxx; linux-doc@xxxxxxxxxxxxxxx; David Woodhouse; >Brian Norris; Marek Vašut; Artem Bityutskiy; Geert Uytterhoeven; Sascha >Hauer; Jingoo Han; Sourav Poddar; Michal Simek; Punnaiah Choudary Kalluri >Subject: Re: [RFC PATCH 1/2] spi: Add support for Zynq QSPI controller > >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 | >>> + SPI_TX_DUAL | SPI_TX_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. Just to add, the zynq qspi controller will automatically select the IO lines based On the flash command. Regards, Punnaiah > >Regards, >Harini ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
