linux-kernel - Re: [PATCH v3 4/5] clk: s2mps15: Add support for S2MPS15 clocks

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Date:	Wed, 28 Oct 2015 13:34:02 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Alim Akhtar <alim.akhtar@...sung.com>, lee.jones@...aro.org,
	broonie@...nel.org
Cc:	mturquette@...libre.com, linux-samsung-soc@...r.kernel.org,
	linux-clk@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/5] clk: s2mps15: Add support for S2MPS15 clocks

On 28.10.2015 10:26, Krzysztof Kozlowski wrote:
> On 26.10.2015 21:51, Alim Akhtar wrote:
>> S2MPS15 PMIC has three 32k buffered clocks outputs. This patch
>> adds supports for the same to the s2mps11 clock driver.
>>
>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>> ---
>>  drivers/clk/Kconfig       |    5 +++--
>>  drivers/clk/clk-s2mps11.c |   24 ++++++++++++++++++++++++
>>  2 files changed, 27 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
>> index a1fa61159179..037a314b5d76 100644
>> --- a/drivers/clk/Kconfig
>> +++ b/drivers/clk/Kconfig
>> @@ -120,9 +120,10 @@ config COMMON_CLK_S2MPS11
>>  	tristate "Clock driver for S2MPS1X/S5M8767 MFD"
>>  	depends on MFD_SEC_CORE
>>  	---help---
>> -	  This driver supports S2MPS11/S2MPS14/S5M8767 crystal oscillator
>> +	  This driver supports S2MPS1X/S5M8767 crystal oscillator
>>  	  clock. These multi-function devices have two (S2MPS14) or three
>> -	  (S2MPS11, S5M8767) fixed-rate oscillators, clocked at 32KHz each.
>> +	  (S2MPS11/S2MPS13/S2MPS15/S5M8767) fixed-rate oscillators,
>> +	  clocked at 32KHz each.
>>  
>>  config CLK_TWL6040
>>  	tristate "External McPDM functional clock from twl6040"
>> diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c
>> index d266299dfdb1..455500dca653 100644
>> --- a/drivers/clk/clk-s2mps11.c
>> +++ b/drivers/clk/clk-s2mps11.c
>> @@ -25,6 +25,7 @@
>>  #include <linux/mfd/samsung/s2mps11.h>
>>  #include <linux/mfd/samsung/s2mps13.h>
>>  #include <linux/mfd/samsung/s2mps14.h>
>> +#include <linux/mfd/samsung/s2mps15.h>
>>  #include <linux/mfd/samsung/s5m8767.h>
>>  #include <linux/mfd/samsung/core.h>
>>  
>> @@ -148,6 +149,24 @@ static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
>>  	},
>>  };
>>  
>> +static struct clk_init_data s2mps15_clks_init[S2MPS11_CLKS_NUM] = {
>> +	[S2MPS11_CLK_AP] = {
>> +		.name = "s2mps15_ap",
>> +		.ops = &s2mps11_clk_ops,
>> +		.flags = CLK_IS_ROOT,
>> +	},
>> +	[S2MPS11_CLK_CP] = {
>> +		.name = "s2mps15_cp",
>> +		.ops = &s2mps11_clk_ops,
>> +		.flags = CLK_IS_ROOT,
>> +	},
>> +	[S2MPS11_CLK_BT] = {
>> +		.name = "s2mps15_bt",
>> +		.ops = &s2mps11_clk_ops,
>> +		.flags = CLK_IS_ROOT,
>> +	},
>> +};
>> +
>>  static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
>>  		struct clk_init_data *clks_init)
>>  {
>> @@ -207,6 +226,10 @@ static int s2mps11_clk_probe(struct platform_device *pdev)
>>  		s2mps11_reg = S2MPS14_REG_RTCCTRL;
>>  		clks_init = s2mps14_clks_init;
>>  		break;
>> +	case S2MPS15X:
>> +		s2mps11_reg = S2MPS15_REG_RTC_BUF;
>> +		clks_init = s2mps15_clks_init;
> 
> Another question (after looking at RTC driver):
> Is this the same register address as S2MPS14?

I found the answer - this is the same address as in S2MPS13 and S2MPS14:
0xc. The S2MPS14 has only two clocks though but S2MPS13 has three.
Again, as in RTC, you should re-use existing support.

It looks there is no need for this patch at all.

Best regards,
Krzysztof
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