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

[Andy Shevchenko]

On Thu, Nov 25, 2021 at 11:47 AM Lh Kuo 郭力豪 <lh.Kuo@xxxxxxxxxxx> 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 = &pdev->dev;

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

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

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

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

>         if (mode == SP7021_SLAVE_MODE)
>                 ctlr = devm_spi_alloc_slave(dev, sizeof(*pspim));
>         else
>                 ctlr = devm_spi_alloc_master(dev, sizeof(*pspim));
>         if (!ctlr)
>                 return -ENOMEM;
>
>         ctlr->dev.of_node = pdev->dev.of_node;
>         ctlr->bus_num = pdev->id;
>         ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
>         ctlr->auto_runtime_pm = true;
>         ctlr->prepare_message = sp7021_spi_controller_prepare_message;
>         if (mode == SP7021_SLAVE_MODE) {
>                 ctlr->transfer_one = sp7021_spi_sla_transfer_one;
>                 ctlr->slave_abort = sp7021_spi_sla_abort;
>                 ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
>         } else {
>                 ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
>                 ctlr->min_speed_hz = 40000;
>                 ctlr->max_speed_hz = 25000000;
>                 ctlr->use_gpio_descriptors = true;
>                 ctlr->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;
>                 ctlr->transfer_one = sp7021_spi_mas_transfer_one;
>         }
>         platform_set_drvdata(pdev, ctlr);
>         pspim = spi_controller_get_devdata(ctlr);
>         pspim->ctlr = ctlr;
>         pspim->dev = dev;
>         spin_lock_init(&pspim->lock);
>         mutex_init(&pspim->buf_lock);
>         init_completion(&pspim->isr_done);
>         init_completion(&pspim->sla_isr);
>         pspim->mas_base = devm_platform_ioremap_resource_byname(pdev, "spi_master");
>         pspim->sla_base = devm_platform_ioremap_resource_byname(pdev, "spi_slave");
>
>         pspim->mas_irq = 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 = 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 = devm_request_irq(dev, pspim->mas_irq, sp7021_spi_mas_irq
>                                                 , IRQF_TRIGGER_RISING, pdev->name, pspim);

Ugly indentation.

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

Ditto.

>         if (ret) {
>                 dev_err(dev, "slave intr devm_request_irq fail\n");
>                 return ret;
>         }
>
>         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");
>         }

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

>         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");

Ditto.

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

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

One line

>         ret = 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 = 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;
> }

-- 
With Best Regards,
Andy Shevchenko