linux-kernel - Re: [PATCH 2/3] ARM: berlin: register cpufreq-dt for the BG2Q

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Date:	Fri, 31 Jul 2015 14:16:02 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
CC:	<sebastian.hesselbarth@...il.com>, <zmxu@...vell.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ARM: berlin: register cpufreq-dt for the BG2Q

Hi Antoine, 

On Thu, 30 Jul 2015 14:35:51 +0200
Antoine Tenart <antoine.tenart@...e-electrons.com> wrote:

> The BG2Q SoC uses cpufreq-dt for cpufreq. Register a platform device for
> this.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
>  arch/arm/mach-berlin/berlin.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm/mach-berlin/berlin.c b/arch/arm/mach-berlin/berlin.c
> index ac181c6797ee..0de906374994 100644
> --- a/arch/arm/mach-berlin/berlin.c
> +++ b/arch/arm/mach-berlin/berlin.c
> @@ -15,9 +15,21 @@
>  #include <linux/io.h>
>  #include <linux/kernel.h>
>  #include <linux/of_platform.h>
> +#include <linux/platform_device.h>
>  #include <asm/hardware/cache-l2x0.h>
>  #include <asm/mach/arch.h>
>  
> +static const struct of_device_id berlin2q_match[] = {
> +	{ .compatible = "marvell,berlin2q" },
> +	{ },
> +};
> +
> +static void __init berlin_init_late(void)
> +{
> +	if (of_find_matching_node(NULL, berlin2q_match))
> +		platform_device_register_simple("cpufreq-dt", -1, NULL, 0);

I'm not sure is it acceptable to always register cpufreq-dt platform device.
In cpufreq-dt driver, the probe will exit if there's no cpuclk node.

> +}
> +
>  static const char * const berlin_dt_compat[] = {
>  	"marvell,berlin",
>  	NULL,
> @@ -25,6 +37,7 @@ static const char * const berlin_dt_compat[] = {
>  
>  DT_MACHINE_START(BERLIN_DT, "Marvell Berlin")
>  	.dt_compat	= berlin_dt_compat,
> +	.init_late	= berlin_init_late,
>  	/*
>  	 * with DT probing for L2CCs, berlin_init_machine can be removed.
>  	 * Note: 88DE3005 (Armada 1500-mini) uses pl310 l2cc

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