linux-kernel - Re: [RFC 02/12] clk: qcom: flag for 64 bit CONFIG

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Date:   Sun, 30 Jul 2017 18:34:51 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     mturquette@...libre.com, andy.gross@...aro.org,
        david.brown@...aro.org, rnayak@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 02/12] clk: qcom: flag for 64 bit CONFIG_CTL

On 2017-07-29 00:03, Stephen Boyd wrote:
> On 07/27, Abhishek Sahu wrote:
>> diff --git a/drivers/clk/qcom/clk-alpha-pll.c 
>> b/drivers/clk/qcom/clk-alpha-pll.c
>> index 47a1da3..e6cde2d 100644
>> --- a/drivers/clk/qcom/clk-alpha-pll.c
>> +++ b/drivers/clk/qcom/clk-alpha-pll.c
>> @@ -118,7 +118,10 @@ void clk_alpha_pll_configure(struct clk_alpha_pll 
>> *pll, struct regmap *regmap,
>>  	regmap_write(regmap, off + PLL_L_VAL, config->l);
>>  	regmap_write(regmap, off + PLL_ALPHA_VAL, config->alpha);
>>  	regmap_write(regmap, off + PLL_CONFIG_CTL, config->config_ctl_val);
>> -	regmap_write(regmap, off + PLL_CONFIG_CTL_U, 
>> config->config_ctl_hi_val);
>> +
>> +	if (pll->flags & SUPPORTS_64BIT_CONFIG_CTL)
>> +		regmap_write(regmap, off + PLL_CONFIG_CTL_U,
>> +			     config->config_ctl_hi_val);
> 
> Is there a hole there? I mean a RAZ/WI register so we can just
> keep writing it and not care?

  We don't have hole for most of the alpha PLL. The offset for
  CONFIG_CTL itself is not same for all types of Alpha PLL
  and the same is being handled in patch 4 of this patch
  series.

  Spark PLL
  CONFIG_CTL	0x18
  TEST_CTL	0x1C
  TEST_CTL_U	0x20

  Brammo PLL
  CONFIG_CTL	0x18
  TEST_CTL	0x1C
  PLL_STATUS     0x24

  Hyuara PLL
  CONFIG_CTL	0x14
  CONFIG_CTL_U	0x18
  TEST_CTL       0x1c