linux-kernel - Re: [PATCH 01/26] ARM: OMAP: dmtimer: Remove setting of clk parent indirectly through platform hook

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Message-ID: <20140507151907.GB9502@atomide.com>
Date:	Wed, 7 May 2014 08:19:08 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Joel Fernandes <joelf@...com>
Cc:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/26] ARM: OMAP: dmtimer: Remove setting of clk parent
 indirectly through platform hook

* Joel Fernandes <joelf@...com> [140424 14:44]:
> There is a platform specific hook just for OMAP1 to set its clk parent.  Remove
> this hook and have OMAP1 set its parent in omap1_dm_timer_init.  If OMAP1 is
> ever migrated to clock framework, the correct way to do this would be through
> clk_set_parent like other platforms.
> 
> Signed-off-by: Joel Fernandes <joelf@...com>
> ---
>  arch/arm/mach-omap1/timer.c                |    8 +++++++-
>  arch/arm/plat-omap/dmtimer.c               |    8 +++-----
>  include/linux/platform_data/dmtimer-omap.h |    2 --
>  3 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm/mach-omap1/timer.c b/arch/arm/mach-omap1/timer.c
> index bde7a35..4b9c604 100644
> --- a/arch/arm/mach-omap1/timer.c
> +++ b/arch/arm/mach-omap1/timer.c
> @@ -140,7 +140,13 @@ static int __init omap1_dm_timer_init(void)
>  			goto err_free_pdata;
>  		}
>  
> -		pdata->set_timer_src = omap1_dm_timer_set_src;
> +		/*
> +		 * Since OMAP1 doesn't support clock framework, set timer clock
> +		 * source to 32KHz here instead of expecting it to be set by
> +		 * dmtimer code.
> +		 */
> +		omap1_dm_timer_set_src(pdev, 0x01);
> +
>  		pdata->timer_capability = OMAP_TIMER_ALWON |
>  				OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
>  

This does not sound right, omap1 does support clock framework just fine.
It is not using the common clock framework though.

This breaks omap_dm_timer_set_source() for sure. Setting the source
during init is not a right solution here. Probably best to keep the
pdata hook around, drivers can support pdata and DT data together
just fine.

Regards,

Tony
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