RE: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support

[Peng Fan]

> Subject: Re: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support
> 
> On Fri, May 21, 2021 at 5:27 AM Peng Fan (OSS) <peng.fan@xxxxxxxxxxx>
> wrote:
> >
> > From: Peng Fan <peng.fan@xxxxxxx>
> >
> > V5:
> >  Rework the blk-ctl driver to let sub-PGC use blk-ctl as parent power
> > domain to fix the potential handshake issue.
> >  I still keep R-b/A-b tag for Patch 1,2,4, since very minor changes  I
> > only drop R-b tag for Patch 3, since it has big change.
> >  An example, the pgc_mipi not take pgc_dispmix as parent:
> >
> >         pgc_dispmix: power-domain@10 {
> >                 #power-domain-cells = <0>;
> >                 reg = <IMX8MM_POWER_DOMAIN_DISPMIX>;
> >                 clocks = <&clk IMX8MM_CLK_DISP_ROOT>,
> >                          <&clk IMX8MM_CLK_DISP_AXI_ROOT>,
> >                          <&clk IMX8MM_CLK_DISP_APB_ROOT>;
> >         };
> >
> >         pgc_mipi: power-domain@11 {
> >                 #power-domain-cells = <0>;
> >                 reg = <IMX8MM_POWER_DOMAIN_MIPI>;
> >                 power-domains = <&dispmix_blk_ctl
> > IMX8MM_BLK_CTL_PD_DISPMIX_BUS>;
> 
> With this change, I get a bunch of errors on boot.  The list of power-domains
> appear correct on the surface, but it also has trouble waking from sleep.
> 
> [    0.695947] imx8mm-blk-ctl imx-dispmix-blk-ctl.0: invalid resource
> [    0.702849] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.0 failed
> with error -22
> [    0.711259] imx8mm-blk-ctl imx-dispmix-blk-ctl.1: invalid resource
> [    0.716451] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.1 failed
> with error -22
> [    0.724856] imx8mm-blk-ctl imx-dispmix-blk-ctl.2: invalid resource
> [    0.730097] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.2 failed
> with error -22
> [    0.738398] imx8mm-blk-ctl imx-dispmix-blk-ctl.3: invalid resource
> [    0.743747] imx8mm-blk-ctl: probe of imx-dispmix-blk-ctl.3 failed
> with error -22

It is just the imx8mm-blk-ctl driver matches with the new created
child device, because the child device points the of_node of the parent
device.
But this error will not affect functionality.
I'll resolve this issue and send out v6.
> 
> If I have a wrong device tree configuration, can you please post an updated
> device tree?  I don't think an official patch for original pgc's were pushed as
> part of either series. I used this e-mail as the patch to enable the blk-ctl.

Do you have an device tree, I could give a look.

Regards,
Peng.

> 
> thanks,
> 
> adam
> 
> >         };
> >
> >         dispmix_blk_ctl: clock-controller@32e28000 {
> >                 compatible = "fsl,imx8mm-dispmix-blk-ctl", "syscon";
> >                 reg = <0x32e28000 0x100>;
> >                 #power-domain-cells = <1>;
> >                 power-domains = <&pgc_dispmix>, <&pgc_mipi>;
> >                 power-domain-names = "dispmix", "mipi";
> >                 clocks = <&clk IMX8MM_CLK_DISP_ROOT>, <&clk
> IMX8MM_CLK_DISP_AXI_ROOT>,
> >                          <&clk IMX8MM_CLK_DISP_APB_ROOT>;
> >         };
> >
> > V4:
> >  Add R-b tag
> >  Typo fix
> >  Update the power domain macro names Per Abel and Frieder
> >
> > V3:
> >  Add explaination for not listing items in patch 2 commit log Per Rob.
> >  Addressed comments from Lucas and Frieder on patch [3,4].
> >  A few comments from Jacky was ignored, because following gpcv2
> > coding style.
> >
> > V2:
> >  Fix yaml check failure.
> >
> > Previously there is an effort from Abel that take BLK-CTL as clock
> > provider, but it turns out that there is A/B lock issue and we are not
> > able resolve that.
> >
> > Per discuss with Lucas and Jacky, we made an agreement that take
> > BLK-CTL as a power domain provider and use GPC's domain as parent, the
> > consumer node take BLK-CTL as power domain input.
> >
> > This patchset has been tested on i.MX8MM EVK board, but one hack is
> > not included in the patchset is that the DISPMIX BLK-CTL
> > MIPI_M/S_RESET not implemented. Per Lucas, we will finally have a MIPI
> > DPHY driver, so fine to leave it.
> >
> > Thanks for Lucas's suggestion, Frieder Schrempf for collecting all the
> > patches, Abel's previous BLK-CTL work, Jacky Bai on help debug issues.
> >
> >
> > Peng Fan (4):
> >   dt-bindings: power: Add defines for i.MX8MM BLK-CTL power domains
> >   Documentation: bindings: clk: Add bindings for i.MX BLK_CTL
> >   soc: imx: Add generic blk-ctl driver
> >   soc: imx: Add blk-ctl driver for i.MX8MM
> >
> >  .../bindings/soc/imx/fsl,imx-blk-ctl.yaml     |  66 ++++
> >  drivers/soc/imx/Makefile                      |   2 +-
> >  drivers/soc/imx/blk-ctl-imx8mm.c              | 139 ++++++++
> >  drivers/soc/imx/blk-ctl.c                     | 311
> ++++++++++++++++++
> >  drivers/soc/imx/blk-ctl.h                     |  85 +++++
> >  include/dt-bindings/power/imx8mm-power.h      |  13 +
> >  6 files changed, 615 insertions(+), 1 deletion(-)  create mode 100644
> > Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml
> >  create mode 100644 drivers/soc/imx/blk-ctl-imx8mm.c  create mode
> > 100644 drivers/soc/imx/blk-ctl.c  create mode 100644
> > drivers/soc/imx/blk-ctl.h
> >
> > --
> > 2.30.0
> >