linux-kernel - Re: [PATCH] clk: ti: clk-7xx: Remove hardwired ABE clock configuration

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Date:	Fri, 25 Sep 2015 09:59:36 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Tero Kristo <t-kristo@...com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
CC:	<linux-omap@...r.kernel.org>, <linux-clk@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: ti: clk-7xx: Remove hardwired ABE clock
 configuration

Tero,

On 09/16/2015 09:42 AM, Tero Kristo wrote:
> On 09/14/2015 11:52 AM, Peter Ujfalusi wrote:
>> Hi Tero,
>>
>> On 08/24/2015 10:35 AM, Peter Ujfalusi wrote:
>>> The ABE related clocks should be configured via DT and not have it wired
>>> inside of the kernel.
>>
>> can you take a look at this patch? It will not cause any regression since we
>> do not have audio support mainline and the pending series does not need this
>> part anymore.
> 
> This patch looks okay to me. So, you are saying this doesn't depend on
> anything? Isn't this causing any boot-time issues with the ABE DPLL left
> dangling with boot setup, potentially blocking PM? I am just wondering if we
> should group this patch with the rest of the audio support patches for dra7.

Without this patch the ABE DPLL will have frequency which is not going to be
correct to be used with the ATL. The ATL is disabled by default and only
enabled when we use the audio. Which is not the case w/o the other series.

-- 
Péter

> 
> -Tero
> 
>>
>>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>>> ---
>>> Hi Tero,
>>>
>>> the ABE PLL configuration can, and will be done for dra7xx in DT with the
>>> assigned-clocks/rate/parent feature so no need to have this anymore.
>>>
>>> Regards,
>>> Peter
>>>
>>>   drivers/clk/ti/clk-7xx.c | 18 +-----------------
>>>   1 file changed, 1 insertion(+), 17 deletions(-)
>>>
>>> diff --git a/drivers/clk/ti/clk-7xx.c b/drivers/clk/ti/clk-7xx.c
>>> index 9b5b289e6334..a911d7de3377 100644
>>> --- a/drivers/clk/ti/clk-7xx.c
>>> +++ b/drivers/clk/ti/clk-7xx.c
>>> @@ -18,7 +18,6 @@
>>>
>>>   #include "clock.h"
>>>
>>> -#define DRA7_DPLL_ABE_DEFFREQ                180633600
>>>   #define DRA7_DPLL_GMAC_DEFFREQ                1000000000
>>>   #define DRA7_DPLL_USB_DEFFREQ                960000000
>>>
>>> @@ -313,27 +312,12 @@ static struct ti_dt_clk dra7xx_clks[] = {
>>>   int __init dra7xx_dt_clk_init(void)
>>>   {
>>>       int rc;
>>> -    struct clk *abe_dpll_mux, *sys_clkin2, *dpll_ck, *hdcp_ck;
>>> +    struct clk *dpll_ck, *hdcp_ck;
>>>
>>>       ti_dt_clocks_register(dra7xx_clks);
>>>
>>>       omap2_clk_disable_autoidle_all();
>>>
>>> -    abe_dpll_mux = clk_get_sys(NULL, "abe_dpll_sys_clk_mux");
>>> -    sys_clkin2 = clk_get_sys(NULL, "sys_clkin2");
>>> -    dpll_ck = clk_get_sys(NULL, "dpll_abe_ck");
>>> -
>>> -    rc = clk_set_parent(abe_dpll_mux, sys_clkin2);
>>> -    if (!rc)
>>> -        rc = clk_set_rate(dpll_ck, DRA7_DPLL_ABE_DEFFREQ);
>>> -    if (rc)
>>> -        pr_err("%s: failed to configure ABE DPLL!\n", __func__);
>>> -
>>> -    dpll_ck = clk_get_sys(NULL, "dpll_abe_m2x2_ck");
>>> -    rc = clk_set_rate(dpll_ck, DRA7_DPLL_ABE_DEFFREQ * 2);
>>> -    if (rc)
>>> -        pr_err("%s: failed to configure ABE DPLL m2x2!\n", __func__);
>>> -
>>>       dpll_ck = clk_get_sys(NULL, "dpll_gmac_ck");
>>>       rc = clk_set_rate(dpll_ck, DRA7_DPLL_GMAC_DEFFREQ);
>>>       if (rc)
>>>
>>
>>
> 

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