linux-kernel - Re: [PATCH v7 1/6] clk: hisilicon: add CRG driver for hi3519 soc

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Date:	Wed, 27 Jan 2016 11:28:14 +0800
From:	xuejiancheng <xuejiancheng@...wei.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	<mturquette@...libre.com>, <sboyd@...eaurora.org>,
	<p.zabel@...gutronix.de>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <khilman@...aro.org>, <arnd@...db.de>,
	<olof@...om.net>, <xuwei5@...ilicon.com>,
	<haojian.zhuang@...aro.org>, <zhangfei.gao@...aro.org>,
	<bintian.wang@...wei.com>, <linux-kernel@...r.kernel.org>,
	<linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <yanhaifeng@...ilicon.com>,
	<yanghongwei@...ilicon.com>, <suwenping@...ilicon.com>,
	<raojun@...ilicon.com>, <ml.yang@...ilicon.com>,
	<gaofei@...ilicon.com>, <zhangzhenxing@...ilicon.com>,
	<xuejiancheng@...ilicon.com>, <lidongpo@...ilicon.com>
Subject: Re: [PATCH v7 1/6] clk: hisilicon: add CRG driver for hi3519 soc

Hi Paul Bolle，
   Thank you for your reply.

On 2016/1/26 9:17, Paul Bolle wrote:
> On ma, 2016-01-25 at 11:01 +0800, Jiancheng Xue wrote:
>> --- a/drivers/clk/hisilicon/Kconfig
>> +++ b/drivers/clk/hisilicon/Kconfig
> 
>> +config COMMON_CLK_HI3519
>> +	bool "Hi3519 Clock Driver"
>> +	depends on ARCH_HISI
>> +	default y
>> +	help
>> +	  Build the clock driver for hi3519.
> 
>> --- a/drivers/clk/hisilicon/Makefile
>> +++ b/drivers/clk/hisilicon/Makefile
> 
>> +obj-$(CONFIG_COMMON_CLK_HI3519)	+= clk-hi3519.o
> 
> If I parsed the above correctly clk-hi3519.o can only be built-in,
> right?
> 
Yes. You are right.

But this clock driver should be able to be compiled as a module.
Even though it is preferred to be built-in.

I'll fix it in next version. Thank you.

Regards,

Jiancheng

>> --- /dev/null
>> +++ b/drivers/clk/hisilicon/clk-hi3519.c
> 
>> +#include <linux/module.h>
> 
> So is this include actually needed?
> 
>> +static int hi3519_clk_probe(struct platform_device *pdev)
>> +{
>> +       struct device_node *np = pdev->dev.of_node;
>> +       struct hisi_clock_data *clk_data;
>> +
>> +       clk_data = hisi_clk_init(np, HI3519_NR_CLKS);
>> +       if (!clk_data)
>> +               return -ENODEV;
>> +
>> +       hisi_clk_register_fixed_rate(hi3519_fixed_rate_clks,
>> +                                   
>> ARRAY_SIZE(hi3519_fixed_rate_clks),
>> +                                    clk_data);
>> +       hisi_clk_register_mux(hi3519_mux_clks,
>> ARRAY_SIZE(hi3519_mux_clks),
>> +                                       clk_data);
>> +       hisi_clk_register_gate(hi3519_gate_clks,
>> +                       ARRAY_SIZE(hi3519_gate_clks), clk_data);
>> +
>> +       return hisi_reset_init(np);
>> +}
> 
> (evolution 3.16.5 makes replying to code quite a challenge.)
> 
>> +static const struct of_device_id hi3519_clk_match_table[] = {
>> +	{ .compatible = "hisilicon,hi3519-crg" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, hi3519_clk_match_table);
> 
> Last time I checked MODULE_DEVICE_TABLE is preprocessed away for built
> -in code.
> 
>> +static void __exit hi3519_clk_exit(void)
>> +{
>> +	platform_driver_unregister(&hi3519_clk_driver);
>> +}
>> +module_exit(hi3519_clk_exit);
> 
> Not needed for built-in only code.
> 
>> +MODULE_DESCRIPTION("HiSilicon Hi3519 Clock Driver");
> 
> Ditto.
> 
>> --- a/drivers/clk/hisilicon/clk.c
>> +++ b/drivers/clk/hisilicon/clk.c
> 
>> +EXPORT_SYMBOL(hisi_clk_init);
> 
> What module uses this export?
>  
>> +EXPORT_SYMBOL(hisi_clk_register_fixed_rate);
> 
> Ditto.
> 
>> +EXPORT_SYMBOL(hisi_clk_register_fixed_factor);
> 
> Ditto.
>  
>> +EXPORT_SYMBOL(hisi_clk_register_mux);
> 
> Ditto.
> 
>> +EXPORT_SYMBOL(hisi_clk_register_divider);
> 
> Ditto.
> 
>> +EXPORT_SYMBOL(hisi_clk_register_gate);
> 
> Ditto.
> 
>> +EXPORT_SYMBOL(hisi_clk_register_gate_sep);
> 
> Ditto.
> 
>> --- /dev/null
>> +++ b/drivers/clk/hisilicon/reset.c
> 
>> +int hisi_reset_init(struct device_node *np)
>> +{
>> +	[...]
>> +}
>> +EXPORT_SYMBOL(hisi_reset_init);
> 
> Ditto.
> 
>> --- /dev/null
>> +++ b/drivers/clk/hisilicon/reset.h
> 
>> +#ifdef CONFIG_RESET_CONTROLLER
>> +int hisi_reset_init(struct device_node *np);
>> +#else
>> +static inline int hisi_reset_init(struct device_node *np)
>> +{
>> +	return 0;
>> +}
>> +#endif
> 
> Thanks,
> 
> 
> Paul Bolle
> 
> .
>