linux-kernel - Re: [PATCH V6 0/4] soc: imx: add i.MX BLK-CTL support

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Date:   Mon, 24 May 2021 14:29:43 -0500
From:   Adam Ford <aford173@...il.com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Lucas Stach <l.stach@...gutronix.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Guido Günther <agx@...xcpu.org>,
        Marek Vasut <marex@...x.de>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jacky Bai <ping.bai@....com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Abel Vesa <abel.vesa@....com>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V6 0/4] soc: imx: add i.MX BLK-CTL support

On Sat, May 22, 2021 at 8:10 AM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
>
> From: Peng Fan <peng.fan@....com>
>
> V6:
>  Thanks for Adam's report on V5.
>  Resolve the error message dump, it is the child device reuse
>  the parent device node and matches the parent driver.
>  Filled the remove function for child device.
>  A diff dts file for upstream:
>  https://gist.github.com/MrVan/d73888d8273c43ea4a3b28fa668ca1d0

Since Shawn has merged the pgc portion [1], can you post the device
tree to the mailing list, so he can pull that in too? Without the DT,
the PGC's won't do anything.
If you want me to do it, can I do it, but you've done all the work.

[1] - https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git/log/?h=for-next

thanks

adam

>
> 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>;
>         };
>
>         dispmix_blk_ctl: clock-controller@...28000 {
>                 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                     | 334 ++++++++++++++++++
>  drivers/soc/imx/blk-ctl.h                     |  85 +++++
>  include/dt-bindings/power/imx8mm-power.h      |  13 +
>  6 files changed, 638 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
>