013/11/3 Sebastian Reichel <sre@xxxxxxxxxx>:
> Hi,
>
> This is an early RFC for omap3isp DT support. For now i just created a potential DT
> binding documentation based on the existing platform data:
>
> Binding for the OMAP3 Camera subsystem with the image signal processor (ISP) feature.
>
This is very interesting, I am in the process of transforming an (out
of tree) machine board file into
a device tree description, and I was precisely searching for "oma3isp
dt" when I saw your mail.
I would be happy to test or help develop any patch aiming at DT
support for omap3isp. I am new to DT, so I
will leave the DT bindings review to people that actually have a clue.
I am looking forward to testing patches and bugging you when things break ;)
Regards,
Jean-Philippe François
> omap3isp node
> -------------
>
> Required properties:
>
> - compatible : should be "ti,omap3isp" for OMAP3;
> - reg : physical addresses and length of the registers set;
> - clocks : list of clock specifiers, corresponding to entries in
> clock-names property;
> - clock-names : must contain "cam_ick", "cam_mclk", "csi2_96m_fck",
> "l3_ick" entries, matching entries in the clocks property;
> - interrupts : must contain mmu interrupt;
> - ti,iommu : phandle to isp mmu;
>
> Optional properties:
>
> - VDD_CSIPHY1-supply : regulator for csi phy1
> - VDD_CSIPHY2-supply : regulator for csi phy2
> - ti,isp-xclk-1 : device(s) attached to ISP's first external clock
> - ti,isp-xclk-2 : device(s) attached to ISP's second external clock
>
> device-group subnode
> --------------------
>
> Required properties:
> - ti,isp-interface-type : Integer describing the interface type, one of the following
> * 0 = ISP_INTERFACE_PARALLEL
> * 1 = ISP_INTERFACE_CSI2A_PHY2
> * 2 = ISP_INTERFACE_CCP2B_PHY1
> * 3 = ISP_INTERFACE_CCP2B_PHY2
> * 4 = ISP_INTERFACE_CSI2C_PHY1
> - ti,isp-devices : Array of phandles to devices connected via the interface
> - One of the following configuration nodes (depending on ti,isp-interface-type)
> - ti,ccp2-bus-cfg : CCP2 bus configuration (needed for ISP_INTERFACE_CCP*)
> - ti,parallel-bus-cfg : PARALLEL bus configuration (needed for ISP_INTERFACE_PARALLEL)
> - ti,csi2-bus-cfg : CSI bus configuration (needed for ISP_INTERFACE_CSI*)
>
> ccp2-bus-cfg subnode
> --------------------
>
> Required properties:
> - ti,video-port-clock-divisor : integer; used for video port output clock control
>
> Optional properties:
> - ti,inverted-clock : boolean; clock/strobe signal is inverted
> - ti,enable-crc : boolean; enable crc checking
> - ti,ccp2-mode-mipi : boolean; port is used in MIPI-CSI1 mode (default: CCP2 mode)
> - ti,phy-layer-is-strobe : boolean; use data/strobe physical layer (default: data/clock physical layer)
> - ti,data-lane-configuration : integer array with position and polarity information for lane 1 and 2
> - ti,clock-lane-configuration : integer array with position and polarity information for clock lane
>
> parallel-bus-cfg subnode
> ------------------------
>
> Required properties:
> - ti,data-lane-shift : integer; shift data lanes by this amount
>
> Optional properties:
> - ti,clock-falling-edge : boolean; sample on falling edge (default: rising edge)
> - ti,horizontal-synchronization-active-low : boolean; default: active high
> - ti,vertical-synchronization-active-low : boolean; default: active high
> - ti,data-polarity-ones-complement : boolean; data polarity is one's complement
>
> csi2-bus-cfg subnode
> --------------------
>
> Required properties:
> - ti,video-port-clock-divisor : integer; used for video port output clock control
>
> Optional properties:
> - ti,data-lane-configuration : integer array with position and polarity information for lane 1 and 2
> - ti,clock-lane-configuration : integer array with position and polarity information for clock lane
> - ti,enable-crc : boolean; enable crc checking
>
> Example for Nokia N900
> ----------------------
>
> omap3isp: isp@480BC000 {
> compatible = "ti,omap3isp";
> reg = <
> /* OMAP3430+ */
> 0x480BC000 0x070 /* base */
> 0x480BC100 0x078 /* cbuf */
> 0x480BC400 0x1F0 /* cpp2 */
> 0x480BC600 0x0A8 /* ccdc */
> 0x480BCA00 0x048 /* hist */
> 0x480BCC00 0x060 /* h3a */
> 0x480BCE00 0x0A0 /* prev */
> 0x480BD000 0x0AC /* resz */
> 0x480BD200 0x0FC /* sbl */
> 0x480BD400 0x070 /* mmu */
> >;
>
> clocks = < &cam_ick &cam_mclk &csi2_96m_fck &l3_ick >;
> clock-names = "cam_ick", "cam_mclk", "csi2_96m_fck", "l3_ick";
>
> interrupts = <24>;
>
> ti,iommu = <&mmu_isp>;
>
> ti,isp-xclk-1 = <
> &et8ek8
> &smiapp_dfl
> >;
>
> group1: device-group@0 {
> ti,isp-interface-type = <2>;
>
> ti,isp-devices = <
> &et8ek8
> &ad5820
> &adp1653
> >;
>
> ti,ccp2-bus-cfg {
> ti,enable-crc;
> ti,phy-layer-is-strobe;
> ti,video-port-clock-divisor = <1>;
> };
> };
>
> group2: device-group@1 {
> ti,isp-interface-type = <2>;
>
> ti,isp-devices = <
> &smiapp_dfl
> >;
>
> ti,ccp2-bus-cfg {
> ti,enable-crc;
> ti,phy-layer-is-strobe;
> ti,video-port-clock-divisor = <1>;
> };
> };
> };
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