linux-kernel - Re: [PATCH v2 03/12] remoteproc: stm32: Decouple rproc from DT parsing

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Message-ID: <b68419a6-65a9-08d0-bed8-5f8195ae3d55@st.com>
Date:   Wed, 29 Apr 2020 15:37:58 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        <bjorn.andersson@...aro.org>, <ohad@...ery.com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <loic.pallardy@...com>, <linux-remoteproc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/12] remoteproc: stm32: Decouple rproc from DT
 parsing

Hi Mathieu,

On 4/24/20 10:24 PM, Mathieu Poirier wrote:
> Remove the remote processor from the process of parsing the device tree
> since (1) there is no correlation between them and (2) to use the
> information that was gathered to make a decision on whether to
> synchronise with the M4 or not.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/stm32_rproc.c | 25 ++++++++++++++-----------
>  1 file changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index 1ac90adba9b1..57a426ea620b 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -538,12 +538,11 @@ static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
>  	return err;
>  }
>  
> -static int stm32_rproc_parse_dt(struct platform_device *pdev)
> +static int stm32_rproc_parse_dt(struct platform_device *pdev,
> +				struct stm32_rproc *ddata, bool *auto_boot)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
> -	struct rproc *rproc = platform_get_drvdata(pdev);
> -	struct stm32_rproc *ddata = rproc->priv;
>  	struct stm32_syscon tz;
>  	unsigned int tzen;
>  	int err, irq;
> @@ -589,7 +588,7 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev)
>  
>  	err = regmap_read(tz.map, tz.reg, &tzen);
>  	if (err) {
> -		dev_err(&rproc->dev, "failed to read tzen\n");
> +		dev_err(dev, "failed to read tzen\n");
>  		return err;
>  	}
>  	ddata->secured_soc = tzen & tz.mask;
> @@ -605,7 +604,7 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev)
>  	if (err)
>  		dev_info(dev, "failed to get pdds\n");
>  
> -	rproc->auto_boot = of_property_read_bool(np, "st,auto-boot");
> +	*auto_boot = of_property_read_bool(np, "st,auto-boot");
>  
>  	return stm32_rproc_of_memory_translations(pdev, ddata);
>  }
> @@ -616,6 +615,7 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  	struct stm32_rproc *ddata;
>  	struct device_node *np = dev->of_node;
>  	struct rproc *rproc;
> +	bool auto_boot = false;

Nitpicking: Seems that you don't need to initialize it. 
Perhaps you can simply suppress the local variable and directly use rproc->auto_boot.

else LGTM


Thanks,
Arnaud

>  	int ret;
>  
>  	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> @@ -626,9 +626,16 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  	if (!rproc)
>  		return -ENOMEM;
>  
> +	ddata = rproc->priv;
> +
>  	rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
> +
> +	ret = stm32_rproc_parse_dt(pdev, ddata, &auto_boot);
> +	if (ret)
> +		goto free_rproc;
> +
> +	rproc->auto_boot = auto_boot;
>  	rproc->has_iommu = false;
> -	ddata = rproc->priv;
>  	ddata->workqueue = create_workqueue(dev_name(dev));
>  	if (!ddata->workqueue) {
>  		dev_err(dev, "cannot create workqueue\n");
> @@ -638,13 +645,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, rproc);
>  
> -	ret = stm32_rproc_parse_dt(pdev);
> -	if (ret)
> -		goto free_wkq;
> -
>  	ret = stm32_rproc_request_mbox(rproc);
>  	if (ret)
> -		goto free_rproc;
> +		goto free_wkq;
>  
>  	ret = rproc_add(rproc);
>  	if (ret)
>