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Message-ID: <TY3PR01MB113460C5EF7E6760DD5966BA886442@TY3PR01MB11346.jpnprd01.prod.outlook.com> Date: Mon, 14 Oct 2024 07:58:51 +0000 From: Biju Das <biju.das.jz@...renesas.com> To: Liu Ying <victor.liu@....com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org> CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>, "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>, "rfoss@...nel.org" <rfoss@...nel.org>, laurent.pinchart <laurent.pinchart@...asonboard.com>, "jonas@...boo.se" <jonas@...boo.se>, "jernej.skrabec@...il.com" <jernej.skrabec@...il.com>, "airlied@...il.com" <airlied@...il.com>, "simona@...ll.ch" <simona@...ll.ch>, "maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>, "mripard@...nel.org" <mripard@...nel.org>, "tzimmermann@...e.de" <tzimmermann@...e.de>, "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>, "shawnguo@...nel.org" <shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>, "catalin.marinas@....com" <catalin.marinas@....com>, "will@...nel.org" <will@...nel.org>, "quic_bjorande@...cinc.com" <quic_bjorande@...cinc.com>, "geert+renesas@...der.be" <geert+renesas@...der.be>, "arnd@...db.de" <arnd@...db.de>, "nfraprado@...labora.com" <nfraprado@...labora.com>, "o.rempel@...gutronix.de" <o.rempel@...gutronix.de>, "y.moog@...tec.de" <y.moog@...tec.de>, "marex@...x.de" <marex@...x.de>, "isaac.scott@...asonboard.com" <isaac.scott@...asonboard.com> Subject: RE: [PATCH v2 5/9] dt-bindings: display: bridge: Add ITE IT6263 LVDS to HDMI converter > -----Original Message----- > From: Biju Das > Sent: Monday, October 14, 2024 8:39 AM > To: Liu Ying <victor.liu@....com>; Dmitry Baryshkov <dmitry.baryshkov@...aro.org> > Cc: dri-devel@...ts.freedesktop.org; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; > imx@...ts.linux.dev; linux-arm-kernel@...ts.infradead.org; andrzej.hajda@...el.com; > neil.armstrong@...aro.org; rfoss@...nel.org; laurent.pinchart <laurent.pinchart@...asonboard.com>; > jonas@...boo.se; jernej.skrabec@...il.com; airlied@...il.com; simona@...ll.ch; > maarten.lankhorst@...ux.intel.com; mripard@...nel.org; tzimmermann@...e.de; robh@...nel.org; > krzk+dt@...nel.org; conor+dt@...nel.org; shawnguo@...nel.org; s.hauer@...gutronix.de; > kernel@...gutronix.de; festevam@...il.com; catalin.marinas@....com; will@...nel.org; > quic_bjorande@...cinc.com; geert+renesas@...der.be; arnd@...db.de; nfraprado@...labora.com; > o.rempel@...gutronix.de; y.moog@...tec.de; marex@...x.de; isaac.scott@...asonboard.com > Subject: RE: [PATCH v2 5/9] dt-bindings: display: bridge: Add ITE IT6263 LVDS to HDMI converter > > Hi Liu and Dmitry, > > > -----Original Message----- > > From: Liu Ying <victor.liu@....com> > > Sent: Monday, October 14, 2024 6:34 AM > > Subject: Re: [PATCH v2 5/9] dt-bindings: display: bridge: Add ITE > > IT6263 LVDS to HDMI converter > > > > On 10/14/2024, Dmitry Baryshkov wrote: > > > On Sat, Oct 12, 2024 at 05:14:13PM +0800, Liu Ying wrote: > > >> On 10/12/2024, Dmitry Baryshkov wrote: > > >>> On Sat, Oct 12, 2024 at 03:35:39PM +0800, Liu Ying wrote: > > >>>> Document ITE IT6263 LVDS to HDMI converter. > > >>>> > > >>>> Product link: > > >>>> https://www.ite.com.tw/en/product/cate1/IT6263 > > >>>> > > >>>> Signed-off-by: Liu Ying <victor.liu@....com> > > >>>> --- > > >>>> v2: > > >>>> * Document number of LVDS link data lanes. (Biju) > > >>>> * Simplify ports property by dropping "oneOf". (Rob) > > >>>> > > >>>> .../bindings/display/bridge/ite,it6263.yaml | 276 ++++++++++++++++++ > > >>>> 1 file changed, 276 insertions(+) create mode 100644 > > >>>> Documentation/devicetree/bindings/display/bridge/ite,it6263.yaml > > >>>> > > >>>> diff --git > > >>>> a/Documentation/devicetree/bindings/display/bridge/ite,it6263.yam > > >>>> l > > >>>> b/Documentation/devicetree/bindings/display/bridge/ite,it6263.yam > > >>>> l > > >>>> new file mode 100644 > > >>>> index 000000000000..bc2bbec07623 > > >>>> --- /dev/null > > >>>> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6263 > > >>>> +++ .y > > >>>> +++ aml > > >>>> @@ -0,0 +1,276 @@ > > >>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML > > >>>> +1.2 > > >>>> +--- > > >>>> +$id: > > >>>> +http://devicetree.org/schemas/display/bridge/ite,it6263.yaml# > > >>>> +$schema: http://devicetree.org/meta-schemas/core.yaml# > > >>>> + > > >>>> +title: ITE IT6263 LVDS to HDMI converter > > >>>> + > > >>>> +maintainers: > > >>>> + - Liu Ying <victor.liu@....com> > > >>>> + > > >>>> +description: | > > >>>> + The IT6263 is a high-performance single-chip De-SSC(De-Spread > > >>>> +Spectrum) LVDS > > >>>> + to HDMI converter. Combined with LVDS receiver and HDMI 1.4a > > >>>> +transmitter, > > >>>> + the IT6263 supports LVDS input and HDMI 1.4 output by conversion function. > > >>>> + The built-in LVDS receiver can support single-link and > > >>>> +dual-link LVDS inputs, > > >>>> + and the built-in HDMI transmitter is fully compliant with HDMI > > >>>> +1.4a/3D, HDCP > > >>>> + 1.2 and backward compatible with DVI 1.0 specification. > > >>>> + > > >>>> + The IT6263 also encodes and transmits up to 8 channels of I2S > > >>>> + digital audio, with sampling rate up to 192KHz and sample size > > >>>> + up to 24 bits. In addition, an S/PDIF input port takes in > > >>>> + compressed audio of up to 192KHz > > frame rate. > > >>>> + > > >>>> + The newly supported High-Bit Rate(HBR) audio by HDMI > > >>>> + specifications v1.3 is provided by the IT6263 in two interfaces: > > >>>> + the four I2S input ports or the S/PDIF input port. With both > > >>>> + interfaces the highest possible HBR frame rate is supported at up to 768KHz. > > >>>> + > > >>>> +properties: > > >>> > > >>> No LVDS data-mapping support? > > >> > > >> It is enough to document number of LVDS link data lanes because OS > > >> should be able to determine the data-mapping by looking at the > > >> number and the data-mapping capability of the other side of the LVDS link. > > > > > > From what I can see, data-mapping is specified on the consumer sink > > > side of the LVDS link. This means it should go to the bridge's device node. > > > > Then, I won't define data-lanes, because data-mapping implies it, > > e.g., jeida-24 implies data lanes 0/1/2/3, see lvds-data-mapping.yaml. > > > > Please let me know which one you prefer. > > Assume a top level use case where a user changes the format from JEDAI to VESA using On screen display > or modetest(if some one adds support for lvds-mapping) then setting of the lvds data mapping should be > dynamic. > > Maybe for initial version hardcode with JEDAI or VESA as default and provide a way to override the > host driver and bridge with requested lvds-data mapping dynamically later?? > Maybe use ret = drm_of_lvds_get_data_mapping(bus_node); to get LVDS data mapping see LVDS panel driver?? https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/bridge/lvds-codec.c?h=next-20241011#n173 Cheeers, Biju
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