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Message-ID: <CAHp75VcCpye1u3+PK=C3CT8fMHPSOsXTL5AhbLVy0YyGWfyfkQ@mail.gmail.com>
Date: Thu, 20 Jan 2022 11:51:30 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Lh Kuo 郭力豪 <lh.Kuo@...plus.com>
Cc: Li-hao Kuo <lhjeff911@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
linux-spi <linux-spi@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Wells Lu 呂芳騰 <wells.lu@...plus.com>
Subject: Re: [PATCH v6 1/2] spi: Add spi driver for Sunplus SP7021
On Thu, Jan 20, 2022 at 11:22 AM Lh Kuo 郭力豪 <lh.Kuo@...plus.com> wrote:
...
> > > + if (xfer->tx_buf)
> > > + dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE);
> > > + if (xfer->rx_buf)
> > > + dma_unmap_single(dev, xfer->rx_dma, xfer->len,
> > > + DMA_FROM_DEVICE);
> >
> > Why can't you use SPI core DMA mapping code?
>
> I didn't find the SPI core DMA mapping code for single maping.
> The method currently used is the general DMA single-map code usage method.
Why do you need single page mapping?
What's wrong with SG mapping that SPI core provides?
...
> > > + device_set_node(&ctlr->dev, pdev->dev.fwnode);
> >
> > Use dev_fwnode() in the second argument.
>
> You mean as below ?
>
> device_set_node(&ctlr->dev, dev_fwnode(dev));
Yes.
--
With Best Regards,
Andy Shevchenko
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