Add MIPI calibration device node for Tegra20 and Tegra30.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
arch/arm/boot/dts/nvidia/tegra20.dtsi | 14 ++++++++++++++
arch/arm/boot/dts/nvidia/tegra30.dtsi | 18 ++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/arch/arm/boot/dts/nvidia/tegra20.dtsi b/arch/arm/boot/dts/nvidia/tegra20.dtsi
index 92d422f83ea4..521261045cc8 100644
--- a/arch/arm/boot/dts/nvidia/tegra20.dtsi
+++ b/arch/arm/boot/dts/nvidia/tegra20.dtsi
@@ -74,6 +74,16 @@ vi@54080000 {
status = "disabled";
};
+ /* DSI MIPI calibration logic is a part of VI/CSI */
+ mipi: mipi@54080220 {
+ compatible = "nvidia,tegra20-mipi";
+ reg = <0x54080220 0x100>;
+ clocks = <&tegra_car TEGRA20_CLK_VI>,
+ <&tegra_car TEGRA20_CLK_CSI>;
+ clock-names = "vi", "csi";
+ #nvidia,mipi-calibrate-cells = <1>;
+ };
+
epp@540c0000 {
compatible = "nvidia,tegra20-epp";
reg = <0x540c0000 0x00040000>;
@@ -219,9 +229,13 @@ dsi@54300000 {
clock-names = "dsi", "parent";
resets = <&tegra_car 48>;
reset-names = "dsi";
+ nvidia,mipi-calibrate = <&mipi 0>;
power-domains = <&pd_core>;
operating-points-v2 = <&dsi_dvfs_opp_table>;
status = "disabled";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
};
};
diff --git a/arch/arm/boot/dts/nvidia/tegra30.dtsi b/arch/arm/boot/dts/nvidia/tegra30.dtsi
index 50b0446f43fc..c52ad3715505 100644
--- a/arch/arm/boot/dts/nvidia/tegra30.dtsi
+++ b/arch/arm/boot/dts/nvidia/tegra30.dtsi
@@ -164,6 +164,16 @@ vi@54080000 {
status = "disabled";
};
+ /* DSI MIPI calibration logic is a part of VI/CSI */
+ mipi: mipi@54080220 {
+ compatible = "nvidia,tegra30-mipi";
+ reg = <0x54080220 0x100>;
+ clocks = <&tegra_car TEGRA30_CLK_VI>,
+ <&tegra_car TEGRA30_CLK_CSI>;
+ clock-names = "vi", "csi";
+ #nvidia,mipi-calibrate-cells = <1>;
+ };
+
epp@540c0000 {
compatible = "nvidia,tegra30-epp";
reg = <0x540c0000 0x00040000>;
@@ -321,9 +331,13 @@ dsi@54300000 {
clock-names = "dsi", "parent";
resets = <&tegra_car 48>;
reset-names = "dsi";
+ nvidia,mipi-calibrate = <&mipi 0>;
power-domains = <&pd_core>;
operating-points-v2 = <&dsia_dvfs_opp_table>;
status = "disabled";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
};
dsi@54400000 {
@@ -334,9 +348,13 @@ dsi@54400000 {
clock-names = "dsi", "parent";
resets = <&tegra_car 84>;
reset-names = "dsi";
+ nvidia,mipi-calibrate = <&mipi 0>;
power-domains = <&pd_core>;
operating-points-v2 = <&dsib_dvfs_opp_table>;
status = "disabled";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
};
};
--
2.48.1On Thursday, July 17, 2025 11:21 PM Svyatoslav Ryhel wrote:
> Add MIPI calibration device node for Tegra20 and Tegra30.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
> arch/arm/boot/dts/nvidia/tegra20.dtsi | 14 ++++++++++++++
> arch/arm/boot/dts/nvidia/tegra30.dtsi | 18 ++++++++++++++++++
> 2 files changed, 32 insertions(+)
>
> diff --git a/arch/arm/boot/dts/nvidia/tegra20.dtsi
> b/arch/arm/boot/dts/nvidia/tegra20.dtsi index 92d422f83ea4..521261045cc8
> 100644
> --- a/arch/arm/boot/dts/nvidia/tegra20.dtsi
> +++ b/arch/arm/boot/dts/nvidia/tegra20.dtsi
> @@ -74,6 +74,16 @@ vi@54080000 {
> status = "disabled";
> };
>
> + /* DSI MIPI calibration logic is a part of VI/CSI */
> + mipi: mipi@54080220 {
> + compatible = "nvidia,tegra20-mipi";
> + reg = <0x54080220 0x100>;
> + clocks = <&tegra_car TEGRA20_CLK_VI>,
> + <&tegra_car TEGRA20_CLK_CSI>;
> + clock-names = "vi", "csi";
> + #nvidia,mipi-calibrate-cells = <1>;
> + };
> +
As you say in the comment, MIPI calibration on Tegra20/30 is part of VI/CSI.
We can't add a "mipi" device here since such a device doesn't exist in the
hardware hierarchy. We already have the VI device in the device tree, so we
need to use that.
A driver for tegra20-vi already exists in staging/drivers/media/tegra-video.
We should aim not to break it. Perhaps bring it out of staging? (At least
partially, but then why not the whole thing.)
Thanks,
Mikko
пт, 18 лип. 2025 р. о 12:01 Mikko Perttunen <mperttunen@nvidia.com> пише:
>
> On Thursday, July 17, 2025 11:21 PM Svyatoslav Ryhel wrote:
> > Add MIPI calibration device node for Tegra20 and Tegra30.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > ---
> > arch/arm/boot/dts/nvidia/tegra20.dtsi | 14 ++++++++++++++
> > arch/arm/boot/dts/nvidia/tegra30.dtsi | 18 ++++++++++++++++++
> > 2 files changed, 32 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/nvidia/tegra20.dtsi
> > b/arch/arm/boot/dts/nvidia/tegra20.dtsi index 92d422f83ea4..521261045cc8
> > 100644
> > --- a/arch/arm/boot/dts/nvidia/tegra20.dtsi
> > +++ b/arch/arm/boot/dts/nvidia/tegra20.dtsi
> > @@ -74,6 +74,16 @@ vi@54080000 {
> > status = "disabled";
> > };
> >
> > + /* DSI MIPI calibration logic is a part of VI/CSI */
> > + mipi: mipi@54080220 {
> > + compatible = "nvidia,tegra20-mipi";
> > + reg = <0x54080220 0x100>;
> > + clocks = <&tegra_car TEGRA20_CLK_VI>,
> > + <&tegra_car TEGRA20_CLK_CSI>;
> > + clock-names = "vi", "csi";
> > + #nvidia,mipi-calibrate-cells = <1>;
> > + };
> > +
>
> As you say in the comment, MIPI calibration on Tegra20/30 is part of VI/CSI.
> We can't add a "mipi" device here since such a device doesn't exist in the
> hardware hierarchy. We already have the VI device in the device tree, so we
> need to use that.
I understand your point, but embedding MIPI calibration logic into
VI/CSI driver will bring up another lever of unnecessary complexity
and excessive coding. While approach I have proposed preserves
separation between CSI and DSI and reuses already existing MIPI
calibration framework.
>
> A driver for tegra20-vi already exists in staging/drivers/media/tegra-video.
> We should aim not to break it. Perhaps bring it out of staging? (At least
> partially, but then why not the whole thing.)
It does not break VI/CSI, I have a WIP CSI implementation for
Tegra20/Tegra30 which I hope to submit soon.
>
> Thanks,
> Mikko
>
>
>
>
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