linux-kernel - RE: [PATCH 1/4] spi: add support for octal I/O data transfer

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Date:   Thu, 4 Oct 2018 09:25:56 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "frieder.schrempf@...eet.de" <frieder.schrempf@...eet.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] spi: add support for octal I/O data transfer

Hi Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Thursday, October 4, 2018 2:50 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> Cc: linux-mtd@...ts.infradead.org; marek.vasut@...il.com; vigneshr@...com;
> linux-spi@...r.kernel.org; devicetree@...r.kernel.org; robh@...nel.org;
> mark.rutland@....com; shawnguo@...nel.org; linux-arm-
> kernel@...ts.infradead.org; computersforpeace@...il.com;
> frieder.schrempf@...eet.de; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/4] spi: add support for octal I/O data transfer
> 
> On Thu, 4 Oct 2018 09:14:36 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> 
> > Hi Boris,
> >
> > > -----Original Message-----
> > > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > > Sent: Thursday, October 4, 2018 2:35 PM
> > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> > > Cc: linux-mtd@...ts.infradead.org; marek.vasut@...il.com;
> > > vigneshr@...com; linux-spi@...r.kernel.org;
> > > devicetree@...r.kernel.org; robh@...nel.org; mark.rutland@....com;
> > > shawnguo@...nel.org; linux-arm- kernel@...ts.infradead.org;
> > > computersforpeace@...il.com; frieder.schrempf@...eet.de;
> > > linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/4] spi: add
> > > support for octal I/O data transfer
> > >
> > > Hi Yogesh,
> > >
> > > On Thu,  4 Oct 2018 14:18:37 +0530
> > > Yogesh Gaur <yogeshnarayan.gaur@....com> wrote:
> > >
> > > > Add flags for Octal I/O data transfer Required for the SPI
> > > > controller which can do the data transfer
> > > > (TX/RX) on 8 data lines e.g. NXP FlexSPI controller.
> > > >  SPI_TX_OCTAL: transmit with 8 wires
> > > >  SPI_RX_OCTAL: receive with 8 wires
> > > >
> > > > Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@....com>
> > > > ---
> > > >  drivers/spi/spi.c       | 6 ++++++
> > > >  include/linux/spi/spi.h | 2 ++
> > > >  2 files changed, 8 insertions(+)
> > > >
> > > > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index
> > > > ec395a6..80f672f 100644
> > > > --- a/drivers/spi/spi.c
> > > > +++ b/drivers/spi/spi.c
> > > > @@ -1573,6 +1573,9 @@ static int of_spi_parse_dt(struct
> > > > spi_controller *ctlr,
> > > struct spi_device *spi,
> > > >  		case 4:
> > > >  			spi->mode |= SPI_TX_QUAD;
> > > >  			break;
> > > > +		case 8:
> > > > +			spi->mode |= SPI_TX_OCTAL;
> > > > +			break;
> > > >  		default:
> > > >  			dev_warn(&ctlr->dev,
> > > >  				"spi-tx-bus-width %d not
> > > > supported\n", @@ -
> > > 1591,6 +1594,9 @@
> > > > static int of_spi_parse_dt(struct spi_controller *ctlr, struct
> > > > spi_device *spi, case 4:
> > > >  			spi->mode |= SPI_RX_QUAD;
> > > >  			break;
> > > > +		case 8:
> > > > +			spi->mode |= SPI_RX_OCTAL;
> > > > +			break;
> > > >  		default:
> > > >  			dev_warn(&ctlr->dev,
> > > >  				"spi-rx-bus-width %d not
> > > > supported\n", diff --
> > > git
> > > > a/include/linux/spi/spi.h b/include/linux/spi/spi.h index
> > > > a64235e..2d21307 100644
> > > > --- a/include/linux/spi/spi.h
> > > > +++ b/include/linux/spi/spi.h
> > > > @@ -163,6 +163,8 @@ struct spi_device {
> > > >  #define	SPI_TX_QUAD
> > > > 0x200			/* transmit with 4
> > > wires */
> > > >  #define	SPI_RX_DUAL
> > > > 0x400			/* receive with 2 wires
> > > */
> > > >  #define	SPI_RX_QUAD
> > > > 0x800			/* receive with 4 wires
> > > */
> > > > +#define	SPI_TX_OCTAL
> > > > 0x1000			/* transmit with 8
> > > wires */
> > > > +#define	SPI_RX_OCTAL
> > > > 0x2000			/* receive with 8 wires
> > > */
> > > >  	int			irq;
> > > >  	void			*controller_state;
> > > >  	void			*controller_data;
> > >
> > > You're still not updating spi-mem.c to check those flags and
> > > SPI_MEM_MAX_BUSWIDTH is not updated to match the new limit (8
> > > instead of 4).
> > >
> > Yes and its strange that my octal mode communication is working fine
> > without adding support in spi-mem.c and that's why this has been
> > missed from me.
> 
> Are you based on top of spi-next?

Ok, that might be the reason. I have rebased few days back.
Would rebase with current tip and add support in spi-mem interface too.