Re: [PATCH v3] thermal: ti-soc-thermal: Switch to using managed resources

[Eduardo Valentin <edubezval@gmail.com>]

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Hello Pramod,

On Fri, Oct 10, 2014 at 11:32:12AM +0530, Pramod Gurav wrote:
> This change switches to managed resource APIs to allocated resources
> such as irq, clock. Hence does away with release statements of the
> same resorces in error lables and remove function.
> 
> Cc: Eduardo Valentin <edubezval@gmail.com>
> Cc: Zhang Rui <rui.zhang@intel.com>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
> 
> ---
> Changes since v2:
> - fix failure path of clk_get_rate by returning error.
> Change since v1:
> - Passing struct device to devm_clk_get was missing. Fix the same in v2.
> 

Thanks for updating your patch. Apologize for my late answer.

>  drivers/thermal/ti-soc-thermal/ti-bandgap.c |   58 ++++++++-------------------
>  1 file changed, 16 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> index 634b6ce..22ad68e 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> @@ -1060,7 +1060,7 @@ static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
>  	int status;
>  
>  	/* Request for gpio_86 line */
> -	status = gpio_request(gpio_nr, "tshut");
> +	status = devm_gpio_request(&pdev->dev, gpio_nr, "tshut");
>  	if (status < 0) {
>  		dev_err(bgp->dev, "Could not request for TSHUT GPIO:%i\n", 86);
>  		return status;
> @@ -1071,14 +1071,13 @@ static int ti_bandgap_tshut_init(struct ti_bandgap *bgp,
>  		return status;
>  	}
>  
> -	status = request_irq(gpio_to_irq(gpio_nr), ti_bandgap_tshut_irq_handler,
> -			     IRQF_TRIGGER_RISING, "tshut", NULL);
> -	if (status) {
> -		gpio_free(gpio_nr);
> +	status = devm_request_irq(&pdev->dev, gpio_to_irq(gpio_nr),
> +				  ti_bandgap_tshut_irq_handler,
> +				  IRQF_TRIGGER_RISING, "tshut", NULL);
> +	if (status)
>  		dev_err(bgp->dev, "request irq failed for TSHUT");
> -	}
>  
> -	return 0;
> +	return status;
>  }
>  
>  /**
> @@ -1104,16 +1103,14 @@ static int ti_bandgap_talert_init(struct ti_bandgap *bgp,
>  		dev_err(&pdev->dev, "get_irq failed\n");
>  		return bgp->irq;
>  	}
> -	ret = request_threaded_irq(bgp->irq, NULL,
> +	ret = devm_request_threaded_irq(&pdev->dev, bgp->irq, NULL,
>  				   ti_bandgap_talert_irq_handler,
>  				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
>  				   "talert", bgp);
> -	if (ret) {
> +	if (ret)
>  		dev_err(&pdev->dev, "Request threaded irq failed.\n");
> -		return ret;
> -	}
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static const struct of_device_id of_ti_bandgap_match[];
> @@ -1212,21 +1209,17 @@ int ti_bandgap_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	bgp->fclock = clk_get(NULL, bgp->conf->fclock_name);
> -	ret = IS_ERR(bgp->fclock);
> -	if (ret) {
> +	bgp->fclock = devm_clk_get(&pdev->dev, bgp->conf->fclock_name);
> +	if (IS_ERR(bgp->fclock)) {
>  		dev_err(&pdev->dev, "failed to request fclock reference\n");
> -		ret = PTR_ERR(bgp->fclock);
> -		goto free_irqs;
> +		return PTR_ERR(bgp->fclock);
>  	}
>  
> -	bgp->div_clk = clk_get(NULL,  bgp->conf->div_ck_name);
> -	ret = IS_ERR(bgp->div_clk);
> -	if (ret) {
> +	bgp->div_clk = devm_clk_get(&pdev->dev, bgp->conf->div_ck_name);
> +	if (IS_ERR(bgp->div_clk)) {
>  		dev_err(&pdev->dev,
>  			"failed to request div_ts_ck clock ref\n");
> -		ret = PTR_ERR(bgp->div_clk);
> -		goto free_irqs;
> +		return PTR_ERR(bgp->div_clk);
>  	}
>  

This part is a little tricky. What board have you tried this patch? Are
you sure that now passing the struct device * you are really receiving
the clk struct?

The thing is, from top of my head, in order to pass the struct device *
you need also to change the OMAP clk data structures under arch/arm/.
And remember, for all the supported chips in this driver.

Have you check that?

Please, let me know how you tested this patch.

Cheers,

Eduardo Valentin

>  	for (i = 0; i < bgp->conf->sensor_count; i++) {
> @@ -1249,9 +1242,8 @@ int ti_bandgap_probe(struct platform_device *pdev)
>  				  bgp->conf->sensors[0].ts_data->max_freq);
>  	if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq ||
>  	    clk_rate <= 0) {
> -		ret = -ENODEV;
>  		dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
> -		goto put_clks;
> +		return -ENODEV;
>  	}
>  
>  	ret = clk_set_rate(bgp->div_clk, clk_rate);
> @@ -1357,14 +1349,6 @@ remove_sensors:
>  disable_clk:
>  	if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
>  		clk_disable_unprepare(bgp->fclock);
> -put_clks:
> -	clk_put(bgp->fclock);
> -	clk_put(bgp->div_clk);
> -free_irqs:
> -	if (TI_BANDGAP_HAS(bgp, TSHUT)) {
> -		free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
> -		gpio_free(bgp->tshut_gpio);
> -	}
>  
>  	return ret;
>  }
> @@ -1388,16 +1372,6 @@ int ti_bandgap_remove(struct platform_device *pdev)
>  
>  	if (TI_BANDGAP_HAS(bgp, CLK_CTRL))
>  		clk_disable_unprepare(bgp->fclock);
> -	clk_put(bgp->fclock);
> -	clk_put(bgp->div_clk);
> -
> -	if (TI_BANDGAP_HAS(bgp, TALERT))
> -		free_irq(bgp->irq, bgp);
> -
> -	if (TI_BANDGAP_HAS(bgp, TSHUT)) {
> -		free_irq(gpio_to_irq(bgp->tshut_gpio), NULL);
> -		gpio_free(bgp->tshut_gpio);
> -	}
>  
>  	return 0;
>  }
> -- 
> 1.7.9.5
> 

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