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[209.85.221.180]) by smtp.gmail.com with ESMTPSA id a1e0cc1a2514c-87e2a27da43sm2356303241.5.2025.05.30.00.51.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 May 2025 00:51:18 -0700 (PDT) Received: by mail-vk1-f180.google.com with SMTP id 71dfb90a1353d-52f036ef186so500333e0c.1; Fri, 30 May 2025 00:51:18 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCUxmq81yxrLofpYQy5tN/6q7BkDx7d3KyKegst4LIg5jg6ez2h55a5iwQWnCFB93jYX2vzrlccvfzbzWt35PZuUZg==@lists.infradead.org, AJvYcCVYaMzhrwX3TlFu6YApdGcD016UrOPsDUSCZRDNCgLvynZTndzJ8DhruEcT7nSJOCi/yomusWw1KHSdgXnM@lists.infradead.org X-Received: by 2002:a05:6122:2188:b0:52f:724a:c748 with SMTP id 71dfb90a1353d-53080f5955bmr1748247e0c.1.1748591478153; Fri, 30 May 2025 00:51:18 -0700 (PDT) MIME-Version: 1.0 References: <20250529112423.484232-1-j-choudhary@ti.com> In-Reply-To: <20250529112423.484232-1-j-choudhary@ti.com> From: Geert Uytterhoeven Date: Fri, 30 May 2025 09:51:05 +0200 X-Gmail-Original-Message-ID: X-Gm-Features: AX0GCFu5SrfJ6XEYDFBe1Hbl2dYZBDrGAQ09XF6wFfWGxGH0eSYgcybRaCFnqRc Message-ID: Subject: Re: [PATCH] arm64: dts: Add no-hpd property for all ti-sn65dsi86 bridge consumers To: Jayesh Choudhary Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, neil.armstrong@linaro.org, khilman@baylibre.com, devicetree@vger.kernel.org, jbrunet@baylibre.com, martin.blumenstingl@googlemail.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, cros-qcom-dts-watchers@chromium.org, andersson@kernel.org, konradybcio@kernel.org, geert+renesas@glider.be, magnus.damm@gmail.com, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, imx@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, dianders@chromium.org, linux-kernel@vger.kernel.org, max.krummenacher@toradex.com, ernestvanhoecke@gmail.com Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250530_005122_733796_7D9E9983 X-CRM114-Status: GOOD ( 22.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Jayesh, Thanks for your patch! On Thu, 29 May 2025 at 13:24, Jayesh Choudhary wrote: > In the SN65DSI86 DSI-2-eDP bridge, HPD is not supported as of now. > But DisplayPort connector_type usecases does need hpd to be enabled. > In order not to break any platform from those driver changes, add > "no-hpd" property to all the existing sn65dsi86 nodes (that don't > have it already) as hpd is not being used there anyways. > > Signed-off-by: Jayesh Choudhary DT bindings day: no-hpd: type: boolean description: Set if the HPD line on the bridge isn't hooked up to anything or is otherwise unusable. On all Renesas platforms listed below, the DP bridge's HPD pin is wired to the HPD pin on the mini-DP connector. What am I missing? > Upcoming driver changes that will break platforms if we do not have this > property in all the existing sn65dsi86 nodes that assumes hpd is disabled: > Breaking backwards-compatibility with existing DTBs is definitely a no-go. I'll reply there, too... > .../boot/dts/amlogic/meson-g12b-bananapi-cm4-mnt-reform2.dts | 1 + > arch/arm64/boot/dts/freescale/imx8mq-mnt-reform2.dts | 1 + > arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts | 1 + > arch/arm64/boot/dts/renesas/r8a779a0-falcon-cpu.dtsi | 1 + > arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts | 1 + > arch/arm64/boot/dts/renesas/r8a779h0-gray-hawk-single.dts | 1 + > arch/arm64/boot/dts/renesas/white-hawk-cpu-common.dtsi | 1 + > 7 files changed, 7 insertions(+) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds