linux-kernel - Re: [PATCH v6 2/2] spi: loongson: add bus driver for the loongson spi controller

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Date:   Sun, 2 Apr 2023 12:04:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v6 2/2] spi: loongson: add bus driver for the loongson spi
 controller

On 01/04/2023 11:56, Yinbo Zhu wrote:
> This bus driver supports the Loongson spi hardware controller in the
> Loongson platforms and supports to use DTS and PCI framework to
> register spi device resources.
> 
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---


...

> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/spi/spi.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +
> +#include "spi-loongson.h"
> +
> +static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,
> +					  unsigned char data)
> +{
> +	writeb(data, spi->base + reg);

This wrapper does not simplify anything.

> +}
> +
> +static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg)
> +{
> +	return readb(spi->base + reg);

Neither this one.

> +}
> +
> +static void loongson_spi_set_cs(struct spi_device *spi, bool val)
> +{
> +	int cs;
> +	struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
> +

(...)

> +
> +static int __init loongson_spi_pci_init(void)
> +{
> +	int ret;
> +
> +	ret = pci_register_driver(&loongson_spi_pci_driver);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static void __exit loongson_spi_pci_exit(void)
> +{
> +	pci_unregister_driver(&loongson_spi_pci_driver);
> +}
> +
> +module_init(loongson_spi_pci_init);
> +module_exit(loongson_spi_pci_exit);

module_xxx_driver?

> +
> +MODULE_DESCRIPTION("Loongson spi pci driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/spi/spi-loongson-plat.c b/drivers/spi/spi-loongson-plat.c
> new file mode 100644
> index 000000000000..8f4aa70168f3
> --- /dev/null
> +++ b/drivers/spi/spi-loongson-plat.c
> @@ -0,0 +1,66 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +// Platform driver for Loongson SPI Support
> +// Copyright (C) 2023 Loongson Technology Corporation Limited
> +
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +
> +#include "spi-loongson.h"
> +
> +static int loongson_spi_platform_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	int ret;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (res == NULL) {
> +		dev_err(dev, "cannot get io resource memory\n");
> +		return -ENOENT;
> +	}
> +
> +	ret = loongson_spi_init_master(dev, res);
> +	if (ret)
> +		dev_err(dev, "failed to initialize master\n");
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id loongson_spi_id_table[] = {
> +	{ .compatible = "loongson,ls2k-spi", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, loongson_spi_id_table);
> +
> +static struct platform_driver loongson_spi_plat_driver = {
> +	.probe = loongson_spi_platform_probe,
> +	.driver	= {
> +		.name	= "loongson-spi",
> +		.owner	= THIS_MODULE,

Really? We get rid of it years ago. I bet you did not run coccicheck,
smatch, sparse...

> +		.bus = &platform_bus_type,
> +		.pm = &loongson_spi_dev_pm_ops,
> +		.of_match_table = loongson_spi_id_table,
> +	},
> +};
> +
> +static int __init loongson_spi_plat_init(void)
> +{
> +	int ret;
> +
> +	ret = platform_driver_register(&loongson_spi_plat_driver);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static void __exit loongson_spi_plat_exit(void)
> +{
> +	platform_driver_unregister(&loongson_spi_plat_driver);
> +}
> +
> +module_init(loongson_spi_plat_init);
> +module_exit(loongson_spi_plat_exit);

module_platform_driver.

> +
> +MODULE_DESCRIPTION("Loongson spi platform driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/spi/spi-loongson.h b/drivers/spi/spi-loongson.h
> new file mode 100644
> index 000000000000..44818340188d
> --- /dev/null
> +++ b/drivers/spi/spi-loongson.h
> @@ -0,0 +1,41 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Header File for Loongson SPI Driver. */
> +/* Copyright (C) 2023 Loongson Technology Corporation Limited */
> +
> +#ifndef __LINUX_SPI_LOONGSON_H
> +#define __LINUX_SPI_LOONGSON_H
> +
> +#define	LOONGSON_SPI_SPCR_REG	0x00

There is just one space after #define.


Best regards,
Krzysztof