linux-kernel - Re: [PATCH v6 08/10] pwm: pwm-omap-dmtimer: Adapt driver to utilize dmtimer pdata ops

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Message-ID: <eb51e181-8203-0469-d013-dfd40f7da95d@microchip.com>
Date:   Mon, 8 Jan 2018 16:47:27 +0200
From:   Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Keerthy <j-keerthy@...com>, <daniel.lezcano@...aro.org>,
        <tony@...mide.com>, <aaro.koskinen@....fi>,
        <thierry.reding@...il.com>
CC:     <linux-pwm@...r.kernel.org>, <ladis@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <t-kristo@...com>, <grygorii.strashko@...com>,
        <sebastian.reichel@...labora.co.uk>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 08/10] pwm: pwm-omap-dmtimer: Adapt driver to utilize
 dmtimer pdata ops


On 08.01.2018 16:44, Neil Armstrong wrote:
> On 08/01/2018 15:33, Keerthy wrote:
>>
>>
>> On Monday 08 January 2018 02:14 PM, Claudiu Beznea wrote:
>>>
>>>
>>> On 02.01.2018 12:09, Keerthy wrote:
>>>> Adapt driver to utilize dmtimer pdata ops instead of pdata-quirks.
>>>>
>>>> Signed-off-by: Keerthy <j-keerthy@...com>
>>>> Tested-by: Ladislav Michl <ladis@...ux-mips.org>
>>>> ---
>>>>  drivers/pwm/pwm-omap-dmtimer.c | 39 ++++++++++++++++++++++-----------------
>>>>  1 file changed, 22 insertions(+), 17 deletions(-)
>>>>
>>>> diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
>>>> index 5ad42f3..3b27aff 100644
>>>> --- a/drivers/pwm/pwm-omap-dmtimer.c
>>>> +++ b/drivers/pwm/pwm-omap-dmtimer.c
>>>> @@ -23,6 +23,7 @@
>>>>  #include <linux/mutex.h>
>>>>  #include <linux/of.h>
>>>>  #include <linux/of_platform.h>
>>>> +#include <linux/platform_data/dmtimer-omap.h>
>>>>  #include <linux/platform_data/pwm_omap_dmtimer.h>
>>>>  #include <linux/platform_device.h>
>>>>  #include <linux/pm_runtime.h>
>>>> @@ -37,7 +38,7 @@ struct pwm_omap_dmtimer_chip {
>>>>  	struct pwm_chip chip;
>>>>  	struct mutex mutex;
>>>>  	pwm_omap_dmtimer *dm_timer;
>>>> -	struct pwm_omap_dmtimer_pdata *pdata;
>>>> +	struct omap_dm_timer_ops *pdata;
>>>>  	struct platform_device *dm_timer_pdev;
>>>>  };
>>>>  
>>>> @@ -242,19 +243,33 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
>>>>  {
>>>>  	struct device_node *np = pdev->dev.of_node;
>>>>  	struct device_node *timer;
>>>> +	struct platform_device *timer_pdev;
>>>>  	struct pwm_omap_dmtimer_chip *omap;
>>>> -	struct pwm_omap_dmtimer_pdata *pdata;
>>>> +	struct dmtimer_platform_data *timer_pdata;
>>>> +	struct omap_dm_timer_ops *pdata;
>>>>  	pwm_omap_dmtimer *dm_timer;
>>>>  	u32 v;
>>>>  	int status;
>>>>  
>>>> -	pdata = dev_get_platdata(&pdev->dev);
>>>> -	if (!pdata) {
>>>> -		dev_err(&pdev->dev, "Missing dmtimer platform data\n");
>>>> +	timer = of_parse_phandle(np, "ti,timers", 0);
>>> of_node_put() should be called when done with device_node pointer returned
>>> by of_parse_phandle() (you may want to check the return ERROR cases below
>>> regarding this statement):
>>>> +	if (!timer)
>>>> +		return -ENODEV;
>>>> +
>>>> +	timer_pdev = of_find_device_by_node(timer);
>>>> +	if (!timer_pdev) {
>>>> +		dev_err(&pdev->dev, "Unable to find Timer pdev\n");
>>> here
>>>> +		return -ENODEV;
>>>> +	}
>>>> +
>>>> +	timer_pdata = dev_get_platdata(&timer_pdev->dev);
>>>> +	if (!timer_pdata) {
>>>> +		dev_err(&pdev->dev, "dmtimer pdata structure NULL\n");
>>> here
>>>>  		return -EINVAL;
>>>>  	}
>>>>  
>>>> -	if (!pdata->request_by_node ||
>>>> +	pdata = timer_pdata->timer_ops;
>>>> +
>>>> +	if (!pdata || !pdata->request_by_node ||
>>>>  	    !pdata->free ||
>>>>  	    !pdata->enable ||
>>>>  	    !pdata->disable ||
>>>> @@ -270,10 +285,6 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
>>>>  		return -EINVAL;
>>>>  	}
>>>>  
>>>> -	timer = of_parse_phandle(np, "ti,timers", 0);
>>>> -	if (!timer)
>>>> -		return -ENODEV;
>>>> -
>>>>  	if (!of_get_property(timer, "ti,timer-pwm", NULL)) {
>>> here
>>>>  		dev_err(&pdev->dev, "Missing ti,timer-pwm capability\n");
>>>>  		return -ENODEV;
>>>> @@ -291,13 +302,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
>>>>  
>>>>  	omap->pdata = pdata;
>>>>  	omap->dm_timer = dm_timer;
>>>> -
>>>> -	omap->dm_timer_pdev = of_find_device_by_node(timer);
>>>> -	if (!omap->dm_timer_pdev) {
>>>> -		dev_err(&pdev->dev, "Unable to find timer pdev\n");
>>>> -		omap->pdata->free(dm_timer);
>>>> -		return -EINVAL;
>>>> -	}
>>>> +	omap->dm_timer_pdev = timer_pdev;
>>>>  
>>>>  	/*
>>>>  	 * Ensure that the timer is stopped before we allow PWM core to call
>>>>
>>> And all the other return instructions from probe function not listed by git diff
>>
>> Thanks for reviewing. I will add the of_node_put call for all the error
>> paths.
After that you can add: Reviwed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>>
>>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
> 
> Apart the missing of_node_put() :
> 
> Acked-by: Neil Armstrong <narmstrong@...libre.com>
>

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