linux-kernel - Re: [PATCH v1 6/6] clk: rockchip: rk3399: Support module build

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Message-ID: <6568dae9-4910-6525-d424-98a3fec2cae3@arm.com>
Date:   Wed, 2 Sep 2020 17:03:33 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Elaine Zhang <zhangqing@...k-chips.com>, heiko@...ech.de
Cc:     huangtao@...k-chips.com, xf@...k-chips.com, sboyd@...nel.org,
        mturquette@...libre.com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, kever.yang@...k-chips.com,
        linux-rockchip@...ts.infradead.org, xxx@...k-chips.com
Subject: Re: [PATCH v1 6/6] clk: rockchip: rk3399: Support module build

On 2020-09-02 07:50, Elaine Zhang wrote:
> support CLK_OF_DECLARE and builtin_platform_driver_probe
> double clk init method.
> add module author, description and license to support building
> Soc Rk3399 clock driver as module.
> 
> Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
> ---
>   drivers/clk/rockchip/clk-rk3399.c | 40 +++++++++++++++++++++++++++++++
>   1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/clk/rockchip/clk-rk3399.c b/drivers/clk/rockchip/clk-rk3399.c
> index ce1d2446f142..a1d5704b9ba2 100644
> --- a/drivers/clk/rockchip/clk-rk3399.c
> +++ b/drivers/clk/rockchip/clk-rk3399.c
> @@ -5,9 +5,11 @@
>    */
>   
>   #include <linux/clk-provider.h>
> +#include <linux/module.h>
>   #include <linux/io.h>
>   #include <linux/of.h>
>   #include <linux/of_address.h>
> +#include <linux/of_device.h>
>   #include <linux/platform_device.h>
>   #include <linux/regmap.h>
>   #include <dt-bindings/clock/rk3399-cru.h>
> @@ -1600,3 +1602,41 @@ static void __init rk3399_pmu_clk_init(struct device_node *np)
>   	rockchip_clk_of_add_provider(np, ctx);
>   }
>   CLK_OF_DECLARE(rk3399_cru_pmu, "rockchip,rk3399-pmucru", rk3399_pmu_clk_init);
> +
> +static int __init clk_rk3399_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	unsigned long data;
> +
> +	data = (unsigned long)of_device_get_match_data(&pdev->dev);
> +	if (data)
> +		rk3399_pmu_clk_init(np);
> +	else
> +		rk3399_clk_init(np);

It might be clearer and simpler to just store a function pointer in the 
match data directly - there's already precedent for that elsewhere.

Robin.

> +
> +	return 0;
> +}
> +
> +static const struct of_device_id clk_rk3399_match_table[] = {
> +	{
> +		.compatible = "rockchip,rk3399-cru",
> +		.data = (void *)0
> +	},  {
> +		.compatible = "rockchip,rk3399-pmucru",
> +		.data = (void *)1,
> +	},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, clk_rk3399_match_table);
> +
> +static struct platform_driver clk_rk3399_driver = {
> +	.driver		= {
> +		.name	= "clk-rk3399",
> +		.of_match_table = clk_rk3399_match_table,
> +	},
> +};
> +builtin_platform_driver_probe(clk_rk3399_driver, clk_rk3399_probe);
> +
> +MODULE_DESCRIPTION("Rockchip RK3399 Clock Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:clk-rk3399");
>