From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowjanya Komatineni Subject: Re: Re: [RFC PATCH v1 5/5] arm64: tegra: Add Tegra VI CSI suppport in device tree Date: Wed, 29 Jan 2020 08:22:48 -0800 Message-ID: References: <1580235801-4129-1-git-send-email-skomatineni@nvidia.com> <1580235801-4129-6-git-send-email-skomatineni@nvidia.com> <20200129094624.GD2479935@ulmo> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20200129094624.GD2479935@ulmo> Content-Language: en-US Sender: linux-media-owner@vger.kernel.org To: Thierry Reding Cc: jonathanh@nvidia.com, frankc@nvidia.com, hverkuil@xs4all.nl, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org On 1/29/20 1:46 AM, Thierry Reding wrote: > On Tue, Jan 28, 2020 at 10:23:21AM -0800, Sowjanya Komatineni wrote: >> Tegra210 contains VI controller for video input capture from MIPI >> CSI camera sensors and also supports built-in test pattern generator. >> >> CSI ports can be one-to-one mapped to VI channels for capturing from >> an external sensor or from built-in test pattern generator. >> >> This patch adds support for VI and CSI and enables them in Tegra210 >> device tree. >> >> Signed-off-by: Sowjanya Komatineni >> --- >> arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi | 8 +++++++ >> arch/arm64/boot/dts/nvidia/tegra210.dtsi | 31 +++++++++++++++++++++++++- >> 2 files changed, 38 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi >> index b0095072bc28..ec1b3033fa03 100644 >> --- a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi >> +++ b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi >> @@ -10,6 +10,14 @@ >> status = "okay"; >> }; >> >> + vi@54080000 { >> + status = "okay"; >> + }; >> + >> + csi@0x54080838 { >> + status = "okay"; >> + }; >> + >> sor@54580000 { >> status = "okay"; >> >> diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi >> index 48c63256ba7f..c6107ec03ad1 100644 >> --- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi >> +++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi >> @@ -136,9 +136,38 @@ >> >> vi@54080000 { >> compatible = "nvidia,tegra210-vi"; >> - reg = <0x0 0x54080000 0x0 0x00040000>; >> + reg = <0x0 0x54080000 0x0 0x808>; >> interrupts = ; >> status = "disabled"; >> + assigned-clocks = <&tegra_car TEGRA210_CLK_VI>; >> + assigned-clock-parents = <&tegra_car TEGRA210_CLK_PLL_C4_OUT0>; >> + >> + clocks = <&tegra_car TEGRA210_CLK_VI>; >> + clock-names = "vi"; >> + resets = <&tegra_car 20>; >> + reset-names = "vi"; >> + }; >> + >> + csi@0x54080838 { >> + compatible = "nvidia,tegra210-csi"; >> + reg = <0x0 0x54080838 0x0 0x2000>; >> + status = "disabled"; >> + assigned-clocks = <&tegra_car TEGRA210_CLK_CILAB>, >> + <&tegra_car TEGRA210_CLK_CILCD>, >> + <&tegra_car TEGRA210_CLK_CILE>; >> + assigned-clock-parents = <&tegra_car TEGRA210_CLK_PLL_P>, >> + <&tegra_car TEGRA210_CLK_PLL_P>, >> + <&tegra_car TEGRA210_CLK_PLL_P>; >> + assigned-clock-rates = <102000000>, >> + <102000000>, >> + <102000000>; >> + >> + clocks = <&tegra_car TEGRA210_CLK_CSI>, >> + <&tegra_car TEGRA210_CLK_CILAB>, >> + <&tegra_car TEGRA210_CLK_CILCD>, >> + <&tegra_car TEGRA210_CLK_CILE>; >> + clock-names = "csi", "cilab", "cilcd", "cile"; >> + >> }; > Can this be a child of the vi node? Looking at the register ranges it > seems like these are actually a single IP block. If they have separate > blocks with clearly separate functionality, then it makes sense to have > CSI be a child node of VI, though it may also be okay to merge both and > have a single node with the driver doing all of the differentiation > between what's VI and what's CSI. > > Looking at later chips, the split between VI and CSI is more explicit, > so having the split in DT for Tegra210 may make sense for consistency. > > I know we've discussed this before, but for some reason I keep coming > back to this. I'll go through the other patches to see if I can get a > clearer picture of how this could all work together. > > Thierry We can keep it separate as we discussed. But as Tegra186 onwards, CSI is separate device to be all cosistent I kept CSI as separate node for Tegra210 as well.