linux-kernel - Re: [PATCH v12 1/2] fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager

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Message-ID: <20220923081909.GO986@pengutronix.de>
Date:   Fri, 23 Sep 2022 10:19:09 +0200
From:   Sascha Hauer <sha@...gutronix.de>
To:     Ivan Bornyakov <i.bornyakov@...rotek.ru>
Cc:     Xu Yilun <yilun.xu@...el.com>, mdf@...nel.org, hao.wu@...el.com,
        trix@...hat.com, dg@...ix.com, j.zink@...gutronix.de,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        system@...rotek.ru
Subject: Re: [PATCH v12 1/2] fpga: lattice-sysconfig-spi: add Lattice
 sysCONFIG FPGA manager

On Fri, Sep 23, 2022 at 10:16:38AM +0300, Ivan Bornyakov wrote:
> On Fri, Sep 23, 2022 at 02:24:46PM +0800, Xu Yilun wrote:
> > On 2022-09-19 at 16:47:49 +0300, Ivan Bornyakov wrote:
> > > Add support to the FPGA manager for programming Lattice ECP5 FPGA over
> > > slave SPI sysCONFIG interface.
> > > 
> > > sysCONFIG interface core functionality is separate from both ECP5 and
> > > SPI specifics, so support for other FPGAs with different port types can
> > > be added in the future.
> > > 
> > > Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
> > > ---
> > >  drivers/fpga/Kconfig                 |  11 +
> > >  drivers/fpga/Makefile                |   2 +
> > >  drivers/fpga/lattice-sysconfig-spi.c | 153 ++++++++++
> > >  drivers/fpga/lattice-sysconfig.c     | 408 +++++++++++++++++++++++++++
> > >  drivers/fpga/lattice-sysconfig.h     |  40 +++
> > >  5 files changed, 614 insertions(+)
> > >  create mode 100644 drivers/fpga/lattice-sysconfig-spi.c
> > >  create mode 100644 drivers/fpga/lattice-sysconfig.c
> > >  create mode 100644 drivers/fpga/lattice-sysconfig.h
> > > 
> > > diff --git a/drivers/fpga/lattice-sysconfig-spi.c b/drivers/fpga/lattice-sysconfig-spi.c
> > > new file mode 100644
> > > index 000000000000..d015b796adf7
> > > --- /dev/null
> > > +++ b/drivers/fpga/lattice-sysconfig-spi.c
> > > 
> > > ... snip ...
> > > 
> > > +static int sysconfig_isc_enable(struct sysconfig_priv *priv)
> > > +{
> > > +	u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
> > > +	u32 status;
> > > +	int ret;
> > > +
> > > +	ret = sysconfig_cmd_write(priv, isc_enable, sizeof(isc_enable));
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	ret = sysconfig_poll_status(priv, &status);
> > > +	if (ret || (status & SYSCONFIG_STATUS_FAIL))
> > > +		return ret ? : -EFAULT;
> > 
> > If (ret == 0 && status == SYSCONFIG_STATUS_FAIL), still return 0?
> > 
> 
> No, -EFAULT should be returned in that case. Am I overlooked something?

No, you don't, but writing this a bit less terse makes it far more
readable:

	ret = sysconfig_poll_status(priv, &status);
	if (ret)
		return ret;
	if (status & SYSCONFIG_STATUS_FAIL)
		return -EFAULT;

Sascha

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