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In-Reply-To: <6eb68a8153ba46c48862d00f7aa6e0fe@sphcmbx02.sunplus.com.tw>
From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Thu, 25 Nov 2021 12:06:27 +0200
Message-ID: <CAHp75VftSORts5cbDxvfyHgqhxmb7K74BfPd=mST+75C+Ch9dQ@mail.gmail.com>
Subject: Re: [PATCH v3 1/2] SPI: Add SPI driver for Sunplus SP7021
To:     =?UTF-8?B?TGggS3VvIOmDreWKm+ixqg==?= <lh.Kuo@sunplus.com>
Cc:     Mark Brown <broonie@kernel.org>, "LH.Kuo" <lhjeff911@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Rob Herring <robh+dt@kernel.org>,
        linux-spi <linux-spi@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "dvorkin@tibbo.com" <dvorkin@tibbo.com>,
        "qinjian@cqplus1.com" <qinjian@cqplus1.com>,
        =?UTF-8?B?V2VsbHMgTHUg5ZGC6Iqz6aiw?= <wells.lu@sunplus.com>
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On Thu, Nov 25, 2021 at 11:47 AM Lh Kuo =E9=83=AD=E5=8A=9B=E8=B1=AA <lh.Kuo=
@sunplus.com> wrote:

>     I have already modified most of the driver. And the probe function is=
 as follows. Is it okay?

Can be done a bit better, see below (seems you missed few of the comments)

> static int sp7021_spi_controller_probe(struct platform_device *pdev)
> {
>         int ret;
>         int mode;
>         struct spi_controller *ctlr;
>         struct sp7021_spi_ctlr *pspim;
>         struct device *dev =3D &pdev->dev;

Other way around, or i.o.w. "reversed tree".

>         mode =3D SP7021_MASTER_MODE;
>         pdev->id =3D of_alias_get_id(pdev->dev.of_node, "sp_spi");
>
>         if (of_property_read_bool(pdev->dev.of_node, "spi-slave"))
>                 mode =3D SP7021_SLAVE_MODE;

         pdev->id =3D of_alias_get_id(pdev->dev.of_node, "sp_spi");

         mode =3D SP7021_MASTER_MODE;
         if (of_property_read_bool(pdev->dev.of_node, "spi-slave"))
                 mode =3D SP7021_SLAVE_MODE;

>         if (mode =3D=3D SP7021_SLAVE_MODE)
>                 ctlr =3D devm_spi_alloc_slave(dev, sizeof(*pspim));
>         else
>                 ctlr =3D devm_spi_alloc_master(dev, sizeof(*pspim));
>         if (!ctlr)
>                 return -ENOMEM;
>
>         ctlr->dev.of_node =3D pdev->dev.of_node;
>         ctlr->bus_num =3D pdev->id;
>         ctlr->mode_bits =3D SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_F=
IRST;
>         ctlr->auto_runtime_pm =3D true;
>         ctlr->prepare_message =3D sp7021_spi_controller_prepare_message;
>         if (mode =3D=3D SP7021_SLAVE_MODE) {
>                 ctlr->transfer_one =3D sp7021_spi_sla_transfer_one;
>                 ctlr->slave_abort =3D sp7021_spi_sla_abort;
>                 ctlr->flags =3D SPI_CONTROLLER_HALF_DUPLEX;
>         } else {
>                 ctlr->bits_per_word_mask =3D SPI_BPW_MASK(8);
>                 ctlr->min_speed_hz =3D 40000;
>                 ctlr->max_speed_hz =3D 25000000;
>                 ctlr->use_gpio_descriptors =3D true;
>                 ctlr->flags =3D SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_M=
UST_TX;
>                 ctlr->transfer_one =3D sp7021_spi_mas_transfer_one;
>         }
>         platform_set_drvdata(pdev, ctlr);
>         pspim =3D spi_controller_get_devdata(ctlr);
>         pspim->ctlr =3D ctlr;
>         pspim->dev =3D dev;
>         spin_lock_init(&pspim->lock);
>         mutex_init(&pspim->buf_lock);
>         init_completion(&pspim->isr_done);
>         init_completion(&pspim->sla_isr);
>         pspim->mas_base =3D devm_platform_ioremap_resource_byname(pdev, "=
spi_master");
>         pspim->sla_base =3D devm_platform_ioremap_resource_byname(pdev, "=
spi_slave");
>
>         pspim->mas_irq =3D platform_get_irq_byname(pdev, "mas_risc_intr")=
;
>         if (pspim->mas_irq < 0) {

>                 dev_err(dev, "failed to get mas intr\n");

Dup. No need to repeat what's done by platform core.

>                 return pspim->mas_irq;
>         }
>
>         pspim->sla_irq =3D platform_get_irq_byname(pdev, "slave_risc_intr=
");
>         if (pspim->sla_irq < 0) {

>                 dev_err(dev, "failed to get sla intr\n");

Dup.

>                 return pspim->sla_irq;
>         }
>
>         ret =3D devm_request_irq(dev, pspim->mas_irq, sp7021_spi_mas_irq
>                                                 , IRQF_TRIGGER_RISING, pd=
ev->name, pspim);

Ugly indentation.

>         if (ret) {
>                 dev_err(dev, "mas intr devm_request_irq fail\n");
>                 return ret;
>         }
>
>         ret =3D devm_request_irq(dev, pspim->sla_irq, sp7021_spi_sla_irq
>                                                 , IRQF_TRIGGER_RISING, pd=
ev->name, pspim);

Ditto.

>         if (ret) {
>                 dev_err(dev, "slave intr devm_request_irq fail\n");
>                 return ret;
>         }
>
>         pspim->spi_clk =3D devm_clk_get(dev, NULL);

>         if (IS_ERR(pspim->spi_clk)) {
>                 return dev_err_probe(dev, PTR_ERR(pspim->spi_clk), "clk g=
et fail\n");
>         }

Does checkpatch compains on this?
Hint: {} around a single statement shouldn't be added.

>         pspim->rstc =3D 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");

Ditto.

>         }
>
>         ret =3D clk_prepare_enable(pspim->spi_clk);
>         if (ret)

>                 return dev_err_probe(dev, ret,
>                         "failed to enable clk\n");

One line

>         ret =3D reset_control_deassert(pspim->rstc);
>         if (ret) {
>                 dev_err_probe(dev, ret,
>                         "failed to deassert reset\n");

One line.

>                 goto free_reset_assert;

>

Really, pay attention to a stray blank line here and there.

>         }
>
>         pm_runtime_enable(dev);
>
>         ret =3D devm_spi_register_controller(dev, ctlr);

You can't mix non-devm with devm APIs. Either all non-devm, or devm
followed by non-devm.

>         if (ret) {
>                 dev_err(dev, "spi_register_master fail\n");
>                 goto err_disable_pm_runtime;
>         }
>
>         return ret;
>
> err_disable_pm_runtime:
>         pm_runtime_disable(dev);
> free_reset_assert:
>         reset_control_assert(pspim->rstc);
>         clk_disable_unprepare(pspim->spi_clk);
>
>         return ret;
> }

--=20
With Best Regards,
Andy Shevchenko