linux-kernel - Re: [PATCH v2 2/5] mfd: sec: Add support for S2MPS15 PMIC

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Message-id: <562F0B7C.9080307@samsung.com>
Date:	Tue, 27 Oct 2015 10:58:28 +0530
From:	Alim Akhtar <alim.akhtar@...sung.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	broonie@...nel.org, k.kozlowski@...sung.com,
	mturquette@...libre.com, linux-samsung-soc@...r.kernel.org,
	linux-clk@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Thomas Abraham <thomas.ab@...sung.com>
Subject: Re: [PATCH v2 2/5] mfd: sec: Add support for S2MPS15 PMIC

Hello

On 10/26/2015 07:59 PM, Lee Jones wrote:
> On Mon, 26 Oct 2015, Alim Akhtar wrote:
>
>> Hi Lee,
>> Thanks for looking into this.
>>
>> On 10/26/2015 04:36 PM, Lee Jones wrote:
>>> On Mon, 26 Oct 2015, Alim Akhtar wrote:
>>>
>>>> From: Thomas Abraham <thomas.ab@...sung.com>
>>>>
>>>> Add support for S2MPS15 PMIC which is similar to S2MPS11 PMIC. The S2MPS15
>>>> PMIC supports 27 LDO regulators, 10 buck regulators, RTC, three 32.768KHz
>>>> clock outputs and battery charger. This patch adds initial support for
>>>> LDO and buck regulators of S2MPS15 device.
>>>>
>>>> Signed-off-by: Thomas Abraham <thomas.ab@...sung.com>
>>>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>>>> [Alim: Added s2mps15_devs like rtc and clk and related changes]
>>>> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>>> ---
>>>>   drivers/mfd/sec-core.c              |   31 +++++++
>>>>   drivers/mfd/sec-irq.c               |    8 ++
>>>>   include/linux/mfd/samsung/core.h    |    1 +
>>>>   include/linux/mfd/samsung/s2mps15.h |  161 +++++++++++++++++++++++++++++++++++
>>>>   4 files changed, 201 insertions(+)
>>>>   create mode 100644 include/linux/mfd/samsung/s2mps15.h
>>>>
>>>> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
>>>> index 2626fc0b5b8c..db3d4d4ff805 100644
>>>> --- a/drivers/mfd/sec-core.c
>>>> +++ b/drivers/mfd/sec-core.c
>>>> @@ -29,6 +29,7 @@
>>>>   #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/s2mpu02.h>
>>>>   #include <linux/mfd/samsung/s5m8763.h>
>>>>   #include <linux/mfd/samsung/s5m8767.h>
>>>> @@ -96,6 +97,17 @@ static const struct mfd_cell s2mps14_devs[] = {
>>>>   	}
>>>>   };
>>>>
>>>> +static const struct mfd_cell s2mps15_devs[] = {
>>>> +	{
>>>> +		.name = "s2mps15-pmic",
>>>> +	}, {
>>>> +		.name = "s2mps15-rtc",
>>>> +	}, {
>>>
>>> Why don't these have compatibles?
>>>
>> s2mps15-pmic does have compatible below in sec_dt_match[].
>
> Woah!!  What's going on here?  You're matching the MFD and Regulator
> drivers with the same compatible string.  And then registering the
> Regulator device as an MFD.  That's a bit confusing don't you think?
>
Sorry for the confusion, as explained in the binding documentation,
S2MPS15 is a multi-function device which has rtc, regulator and clk 
provider as a sub-blocks. And each of these sub-blocks are represented
as child node of parent MFD node. Out of these only clk controller child 
node needs its own compatible string to populate of_node structure of 
the device so that it can access properties of this sub-node in 
drivers/clk/clk-s2mps11.c.
I just followed "Documentation/devicetree/bindings/mfd/s2mps11.txt"
to implement s2mps15.


>> s2mps15-rtc does not need one as rtc driver does not support OF yet.
>> So no DT node for this as of now.
>
> [...]
>
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