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

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Message-ID: <e9f73341-5262-0d9c-ecb8-f04f18d0bb05@microchip.com>
Date:   Mon, 8 Jan 2018 10:44:16 +0200
From:   Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To:     Keerthy <j-keerthy@...com>, <daniel.lezcano@...aro.org>,
        <tony@...mide.com>, <aaro.koskinen@....fi>,
        <thierry.reding@...il.com>
CC:     <linux-pwm@...r.kernel.org>, <grygorii.strashko@...com>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <t-kristo@...com>, <ladis@...ux-mips.org>,
        <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 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