linux-kernel - Re: [PATCH v2 1/2] clk: qcom: gcc-msm8960: add child devices support.

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Date:	Fri, 30 Jan 2015 18:06:37 +0000
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Bjorn Andersson <bjorn@...o.se>
CC:	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	edubezval@...il.com, nrajan@...eaurora.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 1/2] clk: qcom: gcc-msm8960: add child devices support.



On 30/01/15 16:57, Bjorn Andersson wrote:
> On Fri, Jan 30, 2015 at 2:17 AM, Srinivas Kandagatla
> <srinivas.kandagatla@...aro.org> wrote:
>> This patch adds support to add child devices to gcc as some of the
>> registers mapped by gcc are used by drivers like thermal sensors.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>>   drivers/clk/qcom/gcc-msm8960.c | 10 +++++++++-
>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/qcom/gcc-msm8960.c b/drivers/clk/qcom/gcc-msm8960.c
>> index 0cd3e26..3ba77c5 100644
>> --- a/drivers/clk/qcom/gcc-msm8960.c
>> +++ b/drivers/clk/qcom/gcc-msm8960.c
>> @@ -15,6 +15,7 @@
>>   #include <linux/bitops.h>
>>   #include <linux/err.h>
>>   #include <linux/platform_device.h>
>> +#include <linux/of_platform.h>
>>   #include <linux/module.h>
>>   #include <linux/of.h>
>>   #include <linux/of_device.h>
>> @@ -3658,6 +3659,7 @@ static int gcc_msm8960_probe(struct platform_device *pdev)
>>          struct clk *clk;
>>          struct device *dev = &pdev->dev;
>>          const struct of_device_id *match;
>> +       int ret;
>>
>>          match = of_match_device(gcc_msm8960_match_table, &pdev->dev);
>>          if (!match)
>> @@ -3677,12 +3679,18 @@ static int gcc_msm8960_probe(struct platform_device *pdev)
>>          if (IS_ERR(clk))
>>                  return PTR_ERR(clk);
>>
>> -       return qcom_cc_probe(pdev, match->data);
>> +       ret = qcom_cc_probe(pdev, match->data);
>> +       if (ret)
>> +               return ret;
>> +
>> +       return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
>
> How about calling of_syscon_register() instead? That would give us a
> handle to a regmap that can be consumed in e.g. the thermal driver.

Two things:
- Are you sure, this looks like of_syscon_register() is a static function
- gcc node would be required to add "syscon" compatible

Unless am missing some patches, Am not sure if going via syscon is right 
thing here?

Stephen Any comments?



--srini

>
> I think this use case is exactly why that was introduced.
>
> Regards,
> Bjorn
>
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