linux-kernel - Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021

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Date:   Wed, 1 Dec 2021 21:28:02 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lh Kuo 郭力豪 <lh.Kuo@...plus.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "LH.Kuo" <lhjeff911@...il.com>, 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>,
        "dvorkin@...bo.com" <dvorkin@...bo.com>,
        "qinjian@...lus1.com" <qinjian@...lus1.com>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>
Subject: Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021

On Tue, Nov 30, 2021 at 10:32 AM Lh Kuo 郭力豪 <lh.Kuo@...plus.com> wrote:

> > >         ctlr->dev.of_node = pdev->dev.of_node;
> >
> > device_set_node()
>
> Is this funciton set as follows?
>         device_set_node(&ctlr->dev, of_fwnode_handle(pdev->dev.fwnode));

Can you please do something?
For example, figuring out yourself (Elixir is a very good service for
that): https://elixir.bootlin.com/linux/latest/A/ident/device_set_node

...

> > >         pspim->mas_base = devm_platform_ioremap_resource_byname(pdev, "master");
> > >         pspim->sla_base = devm_platform_ioremap_resource_byname(pdev,
> > > "slave");
> >
> > Where are the error checks?

> The changes are as follows? is this correct?

Almost, but not enough. Please run checkpatch.

>         pspim->mas_base = devm_platform_ioremap_resource_byname(pdev, "master");
>         if (IS_ERR(pspim->mas_base)) {
>                 return dev_err_probe(dev, PTR_ERR(pspim->mas_base), "mas_base get fail\n");
>         }
>
>         pspim->sla_base = devm_platform_ioremap_resource_byname(pdev, "slave");
>         if (IS_ERR(pspim->sla_base)) {
>                 return dev_err_probe(dev, PTR_ERR(pspim->sla_base), "sla_base get fail\n");
>         }

...

> > >         if (ret) {
> > >                 dev_err_probe(dev, ret, "failed to deassert reset\n");
> > >                 goto err_free_reset;
> > >         }
> >
> > These two need to be wrapped as I explained above.
>
> I think these changes are depend on remove-function.

No, it's the other way around: ->remove() implementation depends on
these changes.

> These settings are as follows? is this correct?

No.

>         pspim->spi_clk = devm_clk_get(dev, NULL);
>         if (IS_ERR(pspim->spi_clk))
>                 return dev_err_probe(dev, PTR_ERR(pspim->spi_clk), "clk get fail\n");
>
>         pspim->rstc = devm_reset_control_get_exclusive(dev, NULL);
>         if (IS_ERR(pspim->rstc))
>                 return dev_err_probe(dev, PTR_ERR(pspim->rstc), "rst get fail\n");
>
>         ret = clk_prepare_enable(pspim->spi_clk);
>         if (ret)
>                 return dev_err_probe(dev, ret, "failed to enable clk\n");
>
>         devm_add_action_or_reset(dev, (void(*)(void *))clk_disable_unprepare,
>                         pspim->spi_clk);

Please, find other drivers as examples of how to do that and take care
about possible errors.

>         ret = reset_control_deassert(pspim->rstc);
>         if (ret)
>                 return dev_err_probe(dev, ret, "failed to deassert reset\n");
>
>         devm_add_action_or_reset(dev, (void(*)(void *))reset_control_assert,
>                         pspim->rstc);

Ditto.

>         ret = spi_register_controller(ctlr);

Read what Lukas said.

>         pm_runtime_enable(dev);
>         if (ret) {
>                 pm_runtime_disable(dev);
>                 return dev_err_probe(dev, ret, "spi_register_master fail\n");
>         }
>
>         return ret;
>
> }
>
> static int sp7021_spi_controller_remove(struct platform_device *pdev)
> {
>         struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev);
>
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_set_suspended(&pdev->dev);
>
>         return 0;
> }

-- 
With Best Regards,
Andy Shevchenko