linux-kernel - Re: [PATCH WIP v2 2/8] media: qcom: camss: csiphy-3ph: Use odd bits for configuring C-PHY lanes

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Message-ID: <f9518723-4a04-467d-b5e2-36986477fd3c@ixit.cz>
Date: Fri, 5 Dec 2025 12:59:11 +0100
From: David Heidelberg <david@...t.cz>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Robert Foss <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Luca Weiss <luca.weiss@...rphone.com>, Petr Hodina <phodina@...tonmail.com>,
 Casey Connolly <casey.connolly@...aro.org>, "Dr. Git" <drgitx@...il.com>
Cc: Joel Selvaraj <foss@...lselvaraj.com>,
 Kieran Bingham <kbingham@...nel.org>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 phone-devel@...r.kernel.org
Subject: Re: [PATCH WIP v2 2/8] media: qcom: camss: csiphy-3ph: Use odd bits
 for configuring C-PHY lanes

On 05/12/2025 11:33, Bryan O'Donoghue wrote:
> On 04/12/2025 16:32, David Heidelberg via B4 Relay wrote:
>> +    case V4L2_MBUS_CSI2_CPHY:
>> +        for (int i = 0; i < lane_cfg->num_data; i++)
>> +            lane_mask |= (1 << lane_cfg->data[i].pos) + 1;
>> +        break;
> 
> What does the DTS configuration for this lane mask look like ?

         ports {
                 #address-cells = <1>;
                 #size-cells = <0>;
                 port@0 {
                         reg = <0>;
                         csiphy0_ep: endpoint {
                                 bus-type = <MEDIA_BUS_TYPE_CSI2_CPHY>;
                                 data-lanes = <0 1 2>;
                                 remote-endpoint = <&imx519_ep>;
                         };
                 };
...

         rear_cam: camera@1a {
...
                 port {
                         imx519_ep: endpoint {
                                 remote-endpoint = <&csiphy0_ep>;
                                 data-lanes = <1 2 3>;
                                 link-frequencies = /bits/ 64 <500399375>;
                         };
                 };

David
> 
> ---
> bod

-- 
David Heidelberg