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SubjectRe: [PATCH v3 04/23] dt-bindings: media: Binding document for Qualcomm Camera subsystem driver
Hi Todor,

On Fri, Aug 04, 2017 at 02:54:21PM +0300, Todor Tomov wrote:
> Hi Sakari,
>
> Thank you for the review.

You're welcome!

>
> On 20.07.2017 13:13, Sakari Ailus wrote:
> > Hi Todor,
> >
> > On Mon, Jul 17, 2017 at 01:33:30PM +0300, Todor Tomov wrote:
> >> Add DT binding document for Qualcomm Camera subsystem driver.
> >>
> >> CC: Rob Herring <robh+dt@kernel.org>
> >> CC: devicetree@vger.kernel.org
> >> Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
> >> ---
> >> .../devicetree/bindings/media/qcom,camss.txt | 191 +++++++++++++++++++++
> >> 1 file changed, 191 insertions(+)
> >> create mode 100644 Documentation/devicetree/bindings/media/qcom,camss.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/media/qcom,camss.txt b/Documentation/devicetree/bindings/media/qcom,camss.txt
> >> new file mode 100644
> >> index 0000000..f698498
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/media/qcom,camss.txt
> >> @@ -0,0 +1,191 @@
> >> +Qualcomm Camera Subsystem
> >> +
> >> +* Properties
> >> +
> >> +- compatible:
> >> + Usage: required
> >> + Value type: <stringlist>
> >> + Definition: Should contain:
> >> + - "qcom,msm8916-camss"
> >> +- reg:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: Register ranges as listed in the reg-names property.
> >> +- reg-names:
> >> + Usage: required
> >> + Value type: <stringlist>
> >> + Definition: Should contain the following entries:
> >> + - "csiphy0"
> >> + - "csiphy0_clk_mux"
> >> + - "csiphy1"
> >> + - "csiphy1_clk_mux"
> >> + - "csid0"
> >> + - "csid1"
> >> + - "ispif"
> >> + - "csi_clk_mux"
> >> + - "vfe0"
> >> +- interrupts:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: Interrupts as listed in the interrupt-names property.
> >> +- interrupt-names:
> >> + Usage: required
> >> + Value type: <stringlist>
> >> + Definition: Should contain the following entries:
> >> + - "csiphy0"
> >> + - "csiphy1"
> >> + - "csid0"
> >> + - "csid1"
> >> + - "ispif"
> >> + - "vfe0"
> >> +- power-domains:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: A phandle and power domain specifier pairs to the
> >> + power domain which is responsible for collapsing
> >> + and restoring power to the peripheral.
> >> +- clocks:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: A list of phandle and clock specifier pairs as listed
> >> + in clock-names property.
> >> +- clock-names:
> >> + Usage: required
> >> + Value type: <stringlist>
> >> + Definition: Should contain the following entries:
> >> + - "camss_top_ahb"
> >> + - "ispif_ahb"
> >> + - "csiphy0_timer"
> >> + - "csiphy1_timer"
> >> + - "csi0_ahb"
> >> + - "csi0"
> >> + - "csi0_phy"
> >> + - "csi0_pix"
> >> + - "csi0_rdi"
> >> + - "csi1_ahb"
> >> + - "csi1"
> >> + - "csi1_phy"
> >> + - "csi1_pix"
> >> + - "csi1_rdi"
> >> + - "camss_ahb"
> >> + - "camss_vfe_vfe"
> >> + - "camss_csi_vfe"
> >> + - "iface"
> >> + - "bus"
> >> +- vdda-supply:
> >> + Usage: required
> >> + Value type: <phandle>
> >> + Definition: A phandle to voltage supply for CSI2.
> >> +- iommus:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: A list of phandle and IOMMU specifier pairs.
> >> +
> >> +* Nodes
> >> +
> >> +- ports:
> >> + Usage: required
> >> + Definition: As described in video-interfaces.txt in same directory.
> >> + Properties:
> >> + - reg:
> >> + Usage: required
> >> + Value type: <u32>
> >> + Definition: Selects CSI2 PHY interface - PHY0 or PHY1.
> >> + Endpoint node properties:
> >> + - clock-lanes:
> >> + Usage: required
> >> + Value type: <u32>
> >> + Definition: The clock lane.
> >> + - data-lanes:
> >> + Usage: required
> >> + Value type: <prop-encoded-array>
> >> + Definition: An array of data lanes.
> >> +
> >> +* An Example
> >> +
> >> + camss: camss@1b00000 {
> >> + compatible = "qcom,msm8916-camss";
> >> + reg = <0x1b0ac00 0x200>,
> >> + <0x1b00030 0x4>,
> >> + <0x1b0b000 0x200>,
> >> + <0x1b00038 0x4>,
> >> + <0x1b08000 0x100>,
> >> + <0x1b08400 0x100>,
> >> + <0x1b0a000 0x500>,
> >> + <0x1b00020 0x10>,
> >> + <0x1b10000 0x1000>;
> >> + reg-names = "csiphy0",
> >> + "csiphy0_clk_mux",
> >> + "csiphy1",
> >> + "csiphy1_clk_mux",
> >> + "csid0",
> >> + "csid1",
> >> + "ispif",
> >> + "csi_clk_mux",
> >> + "vfe0";
> >> + interrupts = <GIC_SPI 78 0>,
> >> + <GIC_SPI 79 0>,
> >> + <GIC_SPI 51 0>,
> >> + <GIC_SPI 52 0>,
> >> + <GIC_SPI 55 0>,
> >> + <GIC_SPI 57 0>;
> >> + interrupt-names = "csiphy0",
> >> + "csiphy1",
> >> + "csid0",
> >> + "csid1",
> >> + "ispif",
> >> + "vfe0";
> >> + power-domains = <&gcc VFE_GDSC>;
> >> + clocks = <&gcc GCC_CAMSS_TOP_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_ISPIF_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0PHYTIMER_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1PHYTIMER_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0PHY_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0PIX_CLK>,
> >> + <&gcc GCC_CAMSS_CSI0RDI_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1PHY_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1PIX_CLK>,
> >> + <&gcc GCC_CAMSS_CSI1RDI_CLK>,
> >> + <&gcc GCC_CAMSS_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_VFE0_CLK>,
> >> + <&gcc GCC_CAMSS_CSI_VFE0_CLK>,
> >> + <&gcc GCC_CAMSS_VFE_AHB_CLK>,
> >> + <&gcc GCC_CAMSS_VFE_AXI_CLK>;
> >> + clock-names = "camss_top_ahb",
> >> + "ispif_ahb",
> >> + "csiphy0_timer",
> >> + "csiphy1_timer",
> >> + "csi0_ahb",
> >> + "csi0",
> >> + "csi0_phy",
> >> + "csi0_pix",
> >> + "csi0_rdi",
> >> + "csi1_ahb",
> >> + "csi1",
> >> + "csi1_phy",
> >> + "csi1_pix",
> >> + "csi1_rdi",
> >> + "camss_ahb",
> >> + "camss_vfe_vfe",
> >> + "camss_csi_vfe",
> >> + "iface",
> >> + "bus";
> >> + vdda-supply = <&pm8916_l2>;
> >> + iommus = <&apps_iommu 3>;
> >> + ports {
> >> + #address-cells = <1>;
> >> + #size-cells = <0>;
> >> + port@0 {
> >> + reg = <0>;
> >> + csiphy0_ep: endpoint {
> >> + clock-lanes = <1>;
> >> + data-lanes = <0 2>;
> >
> > Do you support lane mapping? The values suggest "yes". That's something I
> > could improve in the documentation: if lane mapping isn't supported, then
> > the clock lane should be 0 and the data lanes from 1 to n.
>
> Lane mapping is supported only for the data lanes. The clock lane is always
> the physical lane 1. This is why I think it makes sense to keep the value
> of the clock lane to 1 as this is the physical lane 1 really. I'll add
> explanation in the documentation for this and for the data lanes too so
> it is clear.

Could you document this in the binding documentation? What I've seen
previously is that either the lanes can be mapped any way you want, or
there's just a single possible mapping.

>
> >
> > Is the split of the lanes between the ports static and specific to the
> > hardware?
>
> Each port describes a separate CSIPHY so each has its own set of lanes.

Ack. I asked since if the lanes can be shared, the lane numbering needs to
be global to the device; otherwise there's no way to convey the lane/PHY
association using the standard bindings.

--
Regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk

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