From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_NEOMUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61B3AC10F0E for ; Tue, 9 Apr 2019 14:52:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 319AE2064B for ; Tue, 9 Apr 2019 14:52:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="SRG77qsV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 319AE2064B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MERGmiFdwDg5+//bPK2WzVs1hJaHpwuS+0FfZvI1XlA=; b=SRG77qsVywxvr5+AkX+iFwi4K 116fF0OPRLzTv5yU1JhQAJPzKsemJsd3loYtsw9jFa3m6x455AQBjhL4nSN2QLTJl16mj/oYvKblU BoQiiFMkzHftrqKsjSUPASZt/nZfT3m4W7DeFEz8dep4POWzvnps8DtAJ+wseq2x9G1Ix0sjlReCt gPojC1vHq6YnuLHtwaEhN7c46BqS1VdCD/8l34/QmPrkTbai7b7RfmjGgfyfuCZOuLOdmDvrhlS7B 322onjXHhYlSzibVcCGjKGafQgVHxEbFMl2voKBGUwYch3unn7xF0Bs+RcMBiATENaiKvvnSZjkUE nglqe59tQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hDs74-0004hG-7Z; Tue, 09 Apr 2019 14:52:38 +0000 Received: from relay8-d.mail.gandi.net ([217.70.183.201]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hDs70-0004gH-9M for linux-arm-kernel@lists.infradead.org; Tue, 09 Apr 2019 14:52:36 +0000 X-Originating-IP: 90.88.18.121 Received: from localhost (aaubervilliers-681-1-63-121.w90-88.abo.wanadoo.fr [90.88.18.121]) (Authenticated sender: maxime.ripard@bootlin.com) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id A34D91BF212; Tue, 9 Apr 2019 14:52:25 +0000 (UTC) Date: Tue, 9 Apr 2019 16:52:25 +0200 From: Maxime Ripard To: Chen-Yu Tsai Subject: Re: [PATCH 4/6] ARM: dts: sun8i: a83t: Add device node for CSI (Camera Sensor Interface) Message-ID: <20190409145225.2ltluiyqa5xha4zd@flea> References: <20190408165744.11672-1-wens@kernel.org> <20190408165744.11672-5-wens@kernel.org> <20190409075804.4zrwjil7ie2gjigu@flea> <20190409082818.z33mq2qrxethldzf@flea> MIME-Version: 1.0 In-Reply-To: User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190409_075234_629400_08D652D4 X-CRM114-Status: GOOD ( 30.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree , Stephen Boyd , Michael Turquette , linux-kernel , Paul Kocialkowski , Chen-Yu Tsai , Rob Herring , Yong Deng , Mauro Carvalho Chehab , linux-clk , linux-arm-kernel , Linux Media Mailing List Content-Type: multipart/mixed; boundary="===============2930748416782221402==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============2930748416782221402== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="opeshs6swmdpxgen" Content-Disposition: inline --opeshs6swmdpxgen Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Apr 09, 2019 at 04:40:40PM +0800, Chen-Yu Tsai wrote: > On Tue, Apr 9, 2019 at 4:28 PM Maxime Ripard wrote: > > > > On Tue, Apr 09, 2019 at 04:07:34PM +0800, Chen-Yu Tsai wrote: > > > On Tue, Apr 9, 2019 at 3:58 PM Maxime Ripard wrote: > > > > On Tue, Apr 09, 2019 at 12:57:42AM +0800, Chen-Yu Tsai wrote: > > > > > From: Chen-Yu Tsai > > > > > > > > > > The A83T SoC has a camera sensor interface (known as CSI in Allwinner > > > > > lingo), which is similar to the one found on the A64 and H3. The only > > > > > difference seems to be that support of MIPI CSI through a connected > > > > > MIPI CSI-2 bridge. > > > > > > > > > > Add a device node for it, and pinctrl nodes for the commonly used MCLK > > > > > and 8-bit parallel interface. The property /omit-if-no-ref/ is added to > > > > > the pinctrl nodes to keep the device tree blob size down if they are > > > > > unused. > > > > > > > > > > Signed-off-by: Chen-Yu Tsai > > > > > --- > > > > > arch/arm/boot/dts/sun8i-a83t.dtsi | 31 +++++++++++++++++++++++++++++++ > > > > > 1 file changed, 31 insertions(+) > > > > > > > > > > diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi > > > > > index f739b88efb53..0c52f945fd5f 100644 > > > > > --- a/arch/arm/boot/dts/sun8i-a83t.dtsi > > > > > +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi > > > > > @@ -682,6 +682,20 @@ > > > > > #interrupt-cells = <3>; > > > > > #gpio-cells = <3>; > > > > > > > > > > + /omit-if-no-ref/ > > > > > + csi_8bit_parallel_pins: csi-8bit-parallel-pins { > > > > > + pins = "PE0", "PE2", "PE3", "PE6", "PE7", > > > > > + "PE8", "PE9", "PE10", "PE11", > > > > > + "PE12", "PE13"; > > > > > + function = "csi"; > > > > > + }; > > > > > + > > > > > + /omit-if-no-ref/ > > > > > + csi_mclk_pin: csi-mclk-pin { > > > > > + pins = "PE1"; > > > > > + function = "csi"; > > > > > + }; > > > > > + > > > > > emac_rgmii_pins: emac-rgmii-pins { > > > > > pins = "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", > > > > > "PD11", "PD12", "PD13", "PD14", "PD18", > > > > > @@ -994,6 +1008,23 @@ > > > > > interrupts = ; > > > > > }; > > > > > > > > > > + csi: camera@1cb0000 { > > > > > + compatible = "allwinner,sun8i-a83t-csi"; > > > > > + reg = <0x01cb0000 0x1000>; > > > > > + interrupts = ; > > > > > + clocks = <&ccu CLK_BUS_CSI>, > > > > > + <&ccu CLK_CSI_SCLK>, > > > > > + <&ccu CLK_DRAM_CSI>; > > > > > + clock-names = "bus", "mod", "ram"; > > > > > + resets = <&ccu RST_BUS_CSI>; > > > > > + status = "disabled"; > > > > > + > > > > > + csi_in: port { > > > > > + #address-cells = <1>; > > > > > + #size-cells = <0>; > > > > > > > > If we expect a single enpoint, then we don't need the address-cells > > > > and size-cells properties. > > > > > > I wouldn't bet on anything. The way the Q8 tablets did front/back cameras > > > is kind of genius if not very hacky. They have two "identical" sensors > > > on the same I2C bus and CSI bus, with shared reset line but separate > > > shutdown lines. Since they are identical, they also have the same I2C > > > address. I haven't figured out how to model this in the device tree. > > > > > > The point is, it's perfectly possible to have two or more sensors use > > > the same controller, provided only one be active at a time. > > > > Right, but I guess the common case would be to have a single sensor, > > where that wouldn't be needed. > > > > In odd cases, we can always specify it in the DTS, and if it becomes > > common enough, we can move it to the DTSI. > > Makes sense. Do you want me to re-spin? If there's no other comment, we'll fix it when applying. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --opeshs6swmdpxgen Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXKyxqAAKCRDj7w1vZxhR xQqgAPoCwGE+02LeS5CqpwNkNGyMU+On6b/GFxOR2vtPx16ypwEA42TEbPqw9AfF r31IMk7MKBdc6HAcaoxwGTv23e1kfgU= =Fr2o -----END PGP SIGNATURE----- --opeshs6swmdpxgen-- --===============2930748416782221402== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============2930748416782221402==--