Re: [PATCH v4] arm64: dts: imx8mp: Add DT nodes for the two ISPs

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Hi Adam,

On Sun, Aug 18, 2024 at 01:33:26PM -0500, Adam Ford wrote:
> On Sat, Aug 17, 2024 at 1:26 PM Laurent Pinchart wrote:
> > On Thu, Aug 15, 2024 at 02:05:39PM +0200, Alexander Stein wrote:
> > > Am Mittwoch, 14. August 2024, 18:14:51 CEST schrieb Laurent Pinchart:
> > > > From: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
> > > >
> > > > The ISP supports both CSI and parallel interfaces, where port 0
> > > > corresponds to the former and port 1 corresponds to the latter. Since
> > > > the i.MX8MP's ISPs are connected by the parallel interface to the CSI
> > > > receiver, set them both to port 1.
> > > >
> > > > Signed-off-by: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
> > > > Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > > > ---
> > > > Changes since v3:
> > > >
> > > > - Add comment regarding the IMX8MP_CLK_MEDIA_ISP clock rate
> > > > - Fix assigned-clock-rates
> > > > - Dropping Tested-by as the clock configuration has changed
> > > >
> > > > Changes since v2:
> > > >
> > > > - Assign clock parent and frequency in blk-ctrl
> > > >
> > > > Changes since v1:
> > > >
> > > > - Fix clock ordering
> > > > - Add #address-cells and #size-cells to ports nodes
> > > > ---
> > > >  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 57 ++++++++++++++++++++++-
> > > >  1 file changed, 55 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > > index d9b5c40f6460..f3531cfb0d79 100644
> > > > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > > @@ -1673,6 +1673,50 @@ isi_in_1: endpoint {
> > > >                             };
> > > >                     };
> > > >
> > > > +                   isp_0: isp@32e10000 {
> > > > +                           compatible = "fsl,imx8mp-isp";
> > > > +                           reg = <0x32e10000 0x10000>;
> > > > +                           interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;
> > > > +                           clocks = <&clk IMX8MP_CLK_MEDIA_ISP_ROOT>,
> > > > +                                    <&clk IMX8MP_CLK_MEDIA_AXI_ROOT>,
> > > > +                                    <&clk IMX8MP_CLK_MEDIA_APB_ROOT>;
> > > > +                           clock-names = "isp", "aclk", "hclk";
> > > > +                           power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_ISP>;
> > > > +                           fsl,blk-ctrl = <&media_blk_ctrl 0>;
> > > > +                           status = "disabled";
> > > > +
> > > > +                           ports {
> > > > +                                   #address-cells = <1>;
> > > > +                                   #size-cells = <0>;
> > > > +
> > > > +                                   port@1 {
> > > > +                                           reg = <1>;
> > > > +                                   };
> > > > +                           };
> > > > +                   };
> > > > +
> > > > +                   isp_1: isp@32e20000 {
> > > > +                           compatible = "fsl,imx8mp-isp";
> > > > +                           reg = <0x32e20000 0x10000>;
> > > > +                           interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
> > > > +                           clocks = <&clk IMX8MP_CLK_MEDIA_ISP_ROOT>,
> > > > +                                    <&clk IMX8MP_CLK_MEDIA_AXI_ROOT>,
> > > > +                                    <&clk IMX8MP_CLK_MEDIA_APB_ROOT>;
> > > > +                           clock-names = "isp", "aclk", "hclk";
> > > > +                           power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_ISP>;
> > > > +                           fsl,blk-ctrl = <&media_blk_ctrl 1>;
> > > > +                           status = "disabled";
> > > > +
> > > > +                           ports {
> > > > +                                   #address-cells = <1>;
> > > > +                                   #size-cells = <0>;
> > > > +
> > > > +                                   port@1 {
> > > > +                                           reg = <1>;
> > > > +                                   };
> > > > +                           };
> > > > +                   };
> > > > +
> > > >                     dewarp: dwe@32e30000 {
> > > >                             compatible = "nxp,imx8mp-dw100";
> > > >                             reg = <0x32e30000 0x10000>;
> > > > @@ -1869,17 +1913,26 @@ media_blk_ctrl: blk-ctrl@32ec0000 {
> > > >                             clock-names = "apb", "axi", "cam1", "cam2",
> > > >                                           "disp1", "disp2", "isp", "phy";
> > > >
> > > > +                           /*
> > > > +                            * The ISP maximum frequency is 400MHz in normal mode
> > > > +                            * and 500MHz in overdrive mode. The 400MHz operating
> > > > +                            * point hasn't been successfully tested yet, so set
> > > > +                            * IMX8MP_CLK_MEDIA_ISP to 500MHz for the time being.
> > > > +                            */
> > > >                             assigned-clocks = <&clk IMX8MP_CLK_MEDIA_AXI>,
> > > >                                               <&clk IMX8MP_CLK_MEDIA_APB>,
> > > >                                               <&clk IMX8MP_CLK_MEDIA_DISP1_PIX>,
> > > >                                               <&clk IMX8MP_CLK_MEDIA_DISP2_PIX>,
> > > > +                                             <&clk IMX8MP_CLK_MEDIA_ISP>,
> > > >                                               <&clk IMX8MP_VIDEO_PLL1>;
> > > >                             assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_1000M>,
> > > >                                                      <&clk IMX8MP_SYS_PLL1_800M>,
> > > >                                                      <&clk IMX8MP_VIDEO_PLL1_OUT>,
> > > > -                                                    <&clk IMX8MP_VIDEO_PLL1_OUT>;
> > > > +                                                    <&clk IMX8MP_VIDEO_PLL1_OUT>,
> > > > +                                                    <&clk IMX8MP_SYS_PLL2_500M>;
> > > >                             assigned-clock-rates = <500000000>, <200000000>,
> > > > -                                                  <0>, <0>, <1039500000>;
> > > > +                                                  <0>, <0>, <500000000>,
> > > > +                                                  <1039500000>;
> > >
> > > Unfortunately for some reason this reparenting doesn't work (on my platform).
> > > 'media_isp' is still below IMX8MP_CLK_24M.
> > > $ grep -B1 media_isp /sys/kernel/debug/clk/clk_summary
> > >     mipi_dsi_esc_rx                  0       0        0        24000000    0          0     50000      N      deviceless                      no_connection_id
> > >     media_isp                        0       0        0        24000000    0          0     50000      N      deviceless                      no_connection_id
> > >        media_isp_root_clk            0       0        0        24000000    0          0     50000      N         32e10000.isp                    isp
> >
> > Hmmm... I get
> >
> >                 sys_pll2_500m        3       3        0        500000000   0          0     50000      Y                  deviceless                      no_connection_id
> >                    media_isp         0       0        0        500000000   0          0     50000      N                     deviceless                      no_connection_id
> >                       media_isp_root_clk 0       0        0        500000000   0          0     50000      N                        32e10000.isp                    isp
> >
> > > I have to add this diff for isp_0 (and isp_1 if you use it):
> > > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > @@ -1683,6 +1683,9 @@ isp_0: isp@32e10000 {
> > >                                 clock-names = "isp", "aclk", "hclk";
> > >                                 power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_ISP>;
> > >                                 fsl,blk-ctrl = <&media_blk_ctrl 0>;
> > > +                               assigned-clocks = <&clk IMX8MP_CLK_MEDIA_ISP>;
> > > +                               assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_500M>;
> > > +                               assigned-clock-rates = <500000000>;
> > >                                 status = "disabled";
> > >
> > >                                 ports {
> > >
> > > Now clock is setup properly:
> > > $ grep -B1 media_isp /sys/kernel/debug/clk/clk_summary
> > >                 sys_pll2_500m        3       3        0        500000000   0          0     50000      Y                  deviceless                      no_connection_id
> > >                    media_isp         0       0        0        500000000   0          0     50000      N                     deviceless                      no_connection_id
> > >                       media_isp_root_clk 0       0        0        500000000   0          0     50000      N                        32e10000.isp                    isp
> >
> > I'm not sure why that's the case, I don't have assigned-clock*
> > properties in the ISP nodes in my device tree and things still work
> > properly. Would you be able to investigate ?
> 
> For what it's worth, when I remove the extra <0> clock reference on my
> board like:
> 
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1927,7 +1927,7 @@ media_blk_ctrl: blk-ctrl@32ec0000 {
>                                                          <&clk IMX8MP_VIDEO_PLL1_OUT>,
>                                                          <&clk IMX8MP_SYS_PLL2_500M>;
>                                 assigned-clock-rates = <500000000>, <200000000>,
> -                                                      <0>, <0>, <0>, <500000000>,
> +                                                      <0>, <0>, <500000000>,

You're looking at v3, v4 doesn't have the extra 0.

>                                                        <1039500000>;
>                                 #power-domain-cells = <1>;
> 
> 
> I am able to get:
> 
>                 sys_pll2_500m        1       1        0
> 500000000   0          0     50000      Y                  deviceless
>                     no_connection_id
>                    media_isp         0       0        0
> 500000000   0          0     50000      N
> deviceless                      no_connection_id
>                       media_isp_root_clk 0       0        0
> 500000000   0          0     50000      N
> 32e10000.isp                    isp
> 
> 
> The video pll is also  set to 1039500000
>
> > > >                             #power-domain-cells = <1>;
> > > >
> > > >                             lvds_bridge: bridge@5c {
> > > >
> > > > base-commit: 7c626ce4bae1ac14f60076d00eafe71af30450ba
> > > > prerequisite-patch-id: ad2bbccf3b0f27415fb14851cec52c431ccb354f

-- 
Regards,

Laurent Pinchart




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