RE: [PATCH v4] driver: spi: add bcm iproc qspi support.

[Roman Bacik <roman.bacik@broadcom.com>]

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Hi Jagan,

> -----Original Message-----
> From: Jagan Teki <jagan@amarulasolutions.com>
> Sent: Monday, November 1, 2021 10:07 PM
> To: Roman Bacik <roman.bacik@broadcom.com>
> Cc: U-Boot Mailing List <u-boot@lists.denx.de>; Rayagonda Kokatanur
> <rayagonda.kokatanur@broadcom.com>; Bharat Gooty
> <bharat.gooty@broadcom.com>; Vignesh R <vigneshr@ti.com>
> Subject: Re: [PATCH v4] driver: spi: add bcm iproc qspi support.
>
> On Tue, Nov 2, 2021 at 4:57 AM Roman Bacik <roman.bacik@broadcom.com>
> wrote:
> >
> > Hi Jagan,
> >
> > On Mon, Nov 1, 2021 at 12:12 AM Jagan Teki
> <jagan@amarulasolutions.com> wrote:
> > >
> > > On Tue, Oct 26, 2021 at 1:07 AM Roman Bacik
> <roman.bacik@broadcom.com> wrote:
> > > >
> > > > From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
> > > >
> > > > IPROC qspi driver supports both BSPI and MSPI modes.
> > > >
> > > > Signed-off-by: Rayagonda Kokatanur
> <rayagonda.kokatanur@broadcom.com>
> > > > Signed-off-by: Bharat Gooty <bharat.gooty@broadcom.com>
> > > > Acked-by: Rayagonda Kokatanur
> <rayagonda.kokatanur@broadcom.com>
> > > >
> > > > Signed-off-by: Roman Bacik <roman.bacik@broadcom.com>
> > > > ---
> > > >
> > > > Changes in v4:
> > > > - move iproc_qspi.c from spi to mtd/spi
> > > > - remove iproc_qspi.h
> > > > - rename IPROC_QSPI to SPI_FLASH_IPROC
> > > >
> > > > Changes in v3:
> > > > - fix warning by including linux/delay.h
> > > > - change ofdata_to_platdata to of_to_plat
> > > > - change priv_auto_alloc_size to priv_auto
> > > >
> > > > Changes in v2:
> > > > - remove include spi-nor.h
> > > > - define and use named BITs for writing register values
> > > > - remove bspi_set_4byte_mode() method
> > > >
> > > >  drivers/mtd/spi/Kconfig      |   6 +
> > > >  drivers/mtd/spi/Makefile     |   1 +
> > > >  drivers/mtd/spi/iproc_qspi.c | 718
> +++++++++++++++++++++++++++++++++++
> > > >  3 files changed, 725 insertions(+)
> > > >  create mode 100644 drivers/mtd/spi/iproc_qspi.c
> > >
> > > Look like you confused what I've mentioned before, your driver is
> > > flash specific so add a driver in UCLASS_SPI_FLASH. drivers with
> > > UCLASS_SPI to be in drivers/spi/
> > >
> > > Jagan.
> >
> > This is a controller driver and it is currently meant to be used as
> > follows:
> >
> > qspi: spi@370000 {
> >   compatible = "brcm,iproc-qspi";
> >   reg = <0x00370000 0x100>,
> >     <0x00370100 0x100>,
> >     <0x00370200 0x200>;
> >   reg-names = "bspi", "bspi_raf", "mspi";
> >   flash-iomap-addr = /bits/ 64 <0x70000000>;
> >   #address-cells = <1>;
> >   #size-cells = <0>;
> >   spi_nor_flash: spi_flash@0 {
> >     compatible = "jedec,spi-nor";
> >     reg = <0>;
> >     spi-max-frequency = <12500000>;
> >     spi-cpol;
> >     spi-cpha;
> >     spi-tx-bus-width = <1>;
> >     spi-rx-bus-width = <4>;
> >   };
> > };
>
> Does this binding is from Linux? if yes please share Linux driver.
>
> Jagan.

Here is Linux binding document:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/spi/brcm,spi-bcm-qspi.yaml

And here is Linux driver:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-bcm-qspi.c

Thanks,

Roman

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