linux-kernel - Re: [PATCH v6 1/2] spi: Add spi driver for Sunplus SP7021

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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