linux-kernel - Re: [PATCH v3 6/6] clk: rockchip: rk3399: Support module build

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Date:   Thu, 10 Sep 2020 11:07:17 +0800
From:   "elaine.zhang" <zhangqing@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org, xxx@...k-chips.com,
        xf@...k-chips.com, huangtao@...k-chips.com,
        kever.yang@...k-chips.com
Subject: Re: [PATCH v3 6/6] clk: rockchip: rk3399: Support module build

hi,

在 2020/9/7 上午6:49, Heiko Stübner 写道:
> Am Freitag, 4. September 2020, 09:45:05 CEST schrieb Elaine Zhang:
>> 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>
>> Reviewed-by: Kever Yang <kever.yang@...k-chips.com>
>> ---
>>   drivers/clk/rockchip/clk-rk3399.c | 55 +++++++++++++++++++++++++++++++
>>   1 file changed, 55 insertions(+)
>>
>> diff --git a/drivers/clk/rockchip/clk-rk3399.c b/drivers/clk/rockchip/clk-rk3399.c
>> index ce1d2446f142..40ff17aee5b6 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 +1602,56 @@ 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);
>> +
>> +struct clk_rk3399_inits {
>> +		void (*inits)(struct device_node *np);
>> +};
>> +
>> +static const struct clk_rk3399_inits clk_rk3399_pmucru_init = {
>> +	.inits = rk3399_pmu_clk_init,
>> +};
>> +
>> +static const struct clk_rk3399_inits clk_rk3399_cru_init = {
>> +	.inits = rk3399_clk_init,
>> +};
>> +
>> +static const struct of_device_id clk_rk3399_match_table[] = {
>> +	{
>> +		.compatible = "rockchip,rk3399-cru",
>> +		.data = &clk_rk3399_cru_init,
>> +	},  {
>> +		.compatible = "rockchip,rk3399-pmucru",
>> +		.data = &clk_rk3399_pmucru_init,
>> +	},
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, clk_rk3399_match_table);
>> +
>> +static int __init clk_rk3399_probe(struct platform_device *pdev)
>> +{
>> +	struct device_node *np = pdev->dev.of_node;
>> +	const struct of_device_id *match;
>> +	const struct clk_rk3399_inits *init_data;
>> +
>> +	match = of_match_device(clk_rk3399_match_table, &pdev->dev);
>> +	if (!match || !match->data)
>> +		return -EINVAL;
>> +
>> +	init_data = match->data;
>> +	if (init_data->inits)
>> +		init_data->inits(np);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct platform_driver clk_rk3399_driver = {
>> +	.driver		= {
>> +		.name	= "clk-rk3399",
>> +		.of_match_table = clk_rk3399_match_table,
> I guess we probably want
> 		.suppress_bind_attrs = true,
OK, I will add it in the next version.
>
> here, because there is no unloading.
> Also what happens when you try to rmmod the module?
console:/ # lsmod | grep clk

clk_rk808              16384  0
clk_rk3399             49152  0 [permanent]
clk_rockchip           57344  32 rockchip_dmc,rockchip_opp_select,clk_rk3399
rockchip_sip           24576  6 
rk_vcodec,rockchip_pwm_remotectl,rockchip_bus,nvmem_rockchip_efuse,rockchip_pm_config,clk_rockchip

console:/ # rmmod clk_rk3399

rmmod: failed to unload clk_rk3399: Device or resource busy

console:/ # rmmod -f clk_rk3399

rmmod: failed to unload clk_rk3399: Device or resource busy


The builtin_platform_driver_probe()  without the __exit parts.

>
> Heiko
>
>
>
>