linux-kernel - Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver

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Date:   Thu, 10 Jan 2019 16:11:18 +0000
From:   Luis de Oliveira <luis.oliveira@...opsys.com>
To:     "Eugen.Hristev@...rochip.com" <Eugen.Hristev@...rochip.com>,
        "luis.oliveira@...opsys.com" <luis.oliveira@...opsys.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "joao.pinto@...opsys.com" <joao.pinto@...opsys.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "hans.verkuil@...co.com" <hans.verkuil@...co.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "geert@...ux-m68k.org" <geert@...ux-m68k.org>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "treding@...dia.com" <treding@...dia.com>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "todor.tomov@...aro.org" <todor.tomov@...aro.org>
Subject: Re: [V3, 4/4] media: platform: dwc: Add MIPI CSI-2 controller driver



On 10-Dec-18 12:39, Eugen.Hristev@...rochip.com wrote:
> 
> 
> On 19.10.2018 15:52, Luis Oliveira wrote:
>> Add the Synopsys MIPI CSI-2 controller driver. This
>> controller driver is divided in platform dependent functions
>> and core functions. It also includes a platform for future
>> DesignWare drivers.
>>
>> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
>> ---
>> Changelog
>> v2-V3
>> - exposed IPI settings to userspace
>> - fixed headers
> [...]
> 
> snip
> 
> 
>> +
>> +static int
>> +dw_mipi_csi_parse_dt(struct platform_device *pdev, struct mipi_csi_dev *dev)
>> +{
>> +	struct device_node *node = pdev->dev.of_node;
>> +	struct v4l2_fwnode_endpoint endpoint;
> 
> Hello Luis,
> 
> I believe you have to initialize "endpoint" here correctly, otherwise 
> the parsing mechanism (fwnode_endpoint_parse) will consider you have a 
> specific mbus type and fail to probe the endpoint: bail out with debug 
> message "expecting bus type not found "
> 
> (namely, initialize to zero which is the UNKNOWN mbus type, or , to a 
> specific mbus (from DT or whatever source))
> 
> Eugen
> 
Hi Eugen,

Sorry for my late reply, I was on Christmas break.
You are right, I will add that fix.

> 
>> +	int ret;
>> +
>> +	node = of_graph_get_next_endpoint(node, NULL);
>> +	if (!node) {
>> +		dev_err(&pdev->dev, "No port node at %s\n",
>> +				pdev->dev.of_node->full_name);
>> +		return -EINVAL;
>> +	}
>> +
>> +	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(node), &endpoint);
>> +	if (ret)
>> +		goto err;
>> +
>> +	dev->index = endpoint.base.port - 1;
>> +	if (dev->index >= CSI_MAX_ENTITIES) {
>> +		ret = -ENXIO;
>> +		goto err;
>> +	}
>> +	dev->hw.num_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
>> +
>> +err:
>> +	of_node_put(node);
>> +	return ret;
>> +}
>> +
> 
> snip
> 
Thank you.