linux-kernel - Re: [PATCH v2 2/2] memory: omap-gpmc: Allow building as a module

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Date:   Mon, 28 Mar 2022 15:11:52 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Roger Quadros <rogerq@...nel.org>
Cc:     miquel.raynal@...tlin.com, tony@...mide.com, vigneshr@...com,
        kishon@...com, nm@...com, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] memory: omap-gpmc: Allow building as a module

On 28/03/2022 13:13, Roger Quadros wrote:
> Allow OMAP_GPMC to be built as a module.
> 
> Remove redundant of_match_node() call before
> of_platform_default_populate() as the latter takes
> care of matching with of_default_bus_match_table.

Split this part to separate commit, please. It does not look related to
making it a module.

> 
> Move compatible match table to the end where it is usually expected.
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  drivers/memory/Kconfig     |  2 +-
>  drivers/memory/omap-gpmc.c | 44 +++++++++++++++++++++-----------------
>  2 files changed, 25 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
> index da2af9c38fe3..4debd4b2c8da 100644
> --- a/drivers/memory/Kconfig
> +++ b/drivers/memory/Kconfig
> @@ -103,7 +103,7 @@ config TI_EMIF
>  	  temperature changes
>  
>  config OMAP_GPMC
> -	bool "Texas Instruments OMAP SoC GPMC driver"
> +	tristate "Texas Instruments OMAP SoC GPMC driver"
>  	depends on OF_ADDRESS || COMPILE_TEST
>  	select GPIOLIB
>  	help
> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
> index ed11887c1b7c..6fdb76cc3bc9 100644
> --- a/drivers/memory/omap-gpmc.c
> +++ b/drivers/memory/omap-gpmc.c
> @@ -12,6 +12,7 @@
>  #include <linux/cpu_pm.h>
>  #include <linux/irq.h>
>  #include <linux/kernel.h>
> +#include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/err.h>
>  #include <linux/clk.h>
> @@ -1889,16 +1890,6 @@ int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
>  }
>  
>  #ifdef CONFIG_OF
> -static const struct of_device_id gpmc_dt_ids[] = {
> -	{ .compatible = "ti,omap2420-gpmc" },
> -	{ .compatible = "ti,omap2430-gpmc" },
> -	{ .compatible = "ti,omap3430-gpmc" },	/* omap3430 & omap3630 */
> -	{ .compatible = "ti,omap4430-gpmc" },	/* omap4430 & omap4460 & omap543x */
> -	{ .compatible = "ti,am3352-gpmc" },	/* am335x devices */
> -	{ .compatible = "ti,am64-gpmc" },
> -	{ }
> -};
> -
>  static void gpmc_cs_set_name(int cs, const char *name)
>  {
>  	struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
> @@ -2257,11 +2248,9 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>  	if (!of_platform_device_create(child, NULL, &pdev->dev))
>  		goto err_child_fail;
>  
> -	/* is child a common bus? */
> -	if (of_match_node(of_default_bus_match_table, child))
> -		/* create children and other common bus children */
> -		if (of_platform_default_populate(child, NULL, &pdev->dev))
> -			goto err_child_fail;
> +	/* create children and other common bus children */
> +	if (of_platform_default_populate(child, NULL, &pdev->dev))
> +		goto err_child_fail;
>  
>  	return 0;
>  
> @@ -2278,6 +2267,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>  	return ret;
>  }
>  
> +static const struct of_device_id gpmc_dt_ids[];
> +
>  static int gpmc_probe_dt(struct platform_device *pdev)
>  {
>  	int ret;
> @@ -2644,6 +2635,19 @@ static int gpmc_resume(struct device *dev)
>  
>  static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id gpmc_dt_ids[] = {
> +	{ .compatible = "ti,omap2420-gpmc" },
> +	{ .compatible = "ti,omap2430-gpmc" },
> +	{ .compatible = "ti,omap3430-gpmc" },	/* omap3430 & omap3630 */
> +	{ .compatible = "ti,omap4430-gpmc" },	/* omap4430 & omap4460 & omap543x */
> +	{ .compatible = "ti,am3352-gpmc" },	/* am335x devices */
> +	{ .compatible = "ti,am64-gpmc" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
> +#endif
> +
>  static struct platform_driver gpmc_driver = {
>  	.probe		= gpmc_probe,
>  	.remove		= gpmc_remove,
> @@ -2654,8 +2658,8 @@ static struct platform_driver gpmc_driver = {
>  	},
>  };
>  
> -static __init int gpmc_init(void)
> -{
> -	return platform_driver_register(&gpmc_driver);
> -}
> -postcore_initcall(gpmc_init);
> +module_platform_driver(gpmc_driver);
> +
> +MODULE_DESCRIPTION("Texas Instruments GPMC driver");
> +MODULE_ALIAS("platform:" DEVICE_NAME);

Why do you need this alias?

> +MODULE_LICENSE("GPL v2");


Best regards,
Krzysztof