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

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Date:   Fri, 21 May 2021 18:59:15 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     robh+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        p.zabel@...gutronix.de, l.stach@...gutronix.de, krzk@...nel.org,
        agx@...xcpu.org, marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com,
        frieder.schrempf@...tron.de, aford173@...il.com, abel.vesa@....com,
        Peng Fan <peng.fan@....com>
Subject: [PATCH V5 0/4] soc: imx: add i.MX BLK-CTL support

From: Peng Fan <peng.fan@....com>

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                     | 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