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([2a02:810d:15c0:828:2142:d8da:5ae4:d817]) by smtp.gmail.com with ESMTPSA id v14-20020a1709063bce00b0093344ef3764sm3865240ejf.57.2023.03.21.05.38.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Mar 2023 05:38:07 -0700 (PDT) Message-ID: <55cfacf6-03e0-b9bc-83f3-3e9f2d7b2d4d@linaro.org> Date: Tue, 21 Mar 2023 13:38:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property Content-Language: en-US To: Jayesh Choudhary , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, airlied@gmail.com, daniel@ffwll.ch, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, sam@ravnborg.org, jani.nikula@intel.com, tzimmermann@suse.de, javierm@redhat.com, ville.syrjala@linux.intel.com, r-ravikumar@ti.com, lyude@redhat.com, alexander.deucher@amd.com, sjakhade@cadence.com, yamonkar@cadence.com, a-bhatia1@ti.com References: <20230316140823.234263-1-j-choudhary@ti.com> <20230316140823.234263-2-j-choudhary@ti.com> <79ce5fe8-9fb0-5caa-67a0-87dee7867856@ti.com> From: Krzysztof Kozlowski In-Reply-To: <79ce5fe8-9fb0-5caa-67a0-87dee7867856@ti.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/03/2023 13:02, Jayesh Choudhary wrote: >> >>> + type: boolean >>> + description: >>> + Set if the HPD line on the bridge isn't hooked up to anything or is >>> + otherwise unusable. >> >> It's the property of the panel, not bridge. Unless you want to say that >> bridge physically does not have HPD? Does it follow the standard in such >> case? > > MHDP does have hpd. But the mhdp driver should handle the cases when the This is about bindings, not driver. Your driver can still handle this as it wishes. > hpd pin of bridge is not connected to that of the DP-connector. This is > to add support for that. (optional property) Which is indicated by panel no-hpd, right? Or you mean now that HPD physically cannot go to panel because it is cut on the bridge side? But isn't this the same case (from hardware/bindings point, not driver) as panel would not have HPD? Best regards, Krzysztof