On Mon, Mar 27, 2017 at 11:42:51AM -0700, Andrey Smirnov wrote:

On Thu, Mar 23, 2017 at 11:32 PM, Dong Aisheng [off-list ref] wrote:

quoted

On Tue, Mar 21, 2017 at 07:50:03AM -0700, Andrey Smirnov wrote:

quoted

Add DT bindings for power domain driver for GPCv2 IP block found in
i.MX7 SoCs.

Cc: yurovsky@gmail.com
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Fabio Estevam <redacted>
Cc: Dong Aisheng <redacted>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andrey Smirnov <redacted>
---
 .../devicetree/bindings/power/fsl,imx-gpcv2.txt    | 71 ++++++++++++++++++++++
 include/dt-bindings/power/imx7-power.h             | 18 ++++++
 2 files changed, 89 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt
 create mode 100644 include/dt-bindings/power/imx7-power.h

diff --git a/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt b/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt
new file mode 100644
index 0000000..02f45c6
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt

@@ -0,0 +1,71 @@
+Freescale i.MX General Power Controller v2
+==========================================
+
+The i.MX7S/D General Power Control (GPC) block contains Power Gating
+Control (PGC) for various power domains.
+
+Required properties:
+
+- compatible: Should be "fsl,imx7d-gpc"
+
+- reg: should be register base and length as documented in the
+  datasheet
+
+- interrupts: Should contain GPC interrupt request 1
+
+Power domains contained within GPC node are generic power domain
+providers, documented in
+Documentation/devicetree/bindings/power/power_domain.txt, which are
+described as subnodes of the power gating controller 'pgc' node,
+which, in turn, is expected to contain the following:
+
+Required properties:
+
+- reg: Power domain index. Valid values are defined in
+  include/dt-bindings/power/imx7-power.h
+
+- #power-domain-cells: Should be 0
+
+Optional properties:
+
+- power-supply: Power supply used to power the domain
+
+Example:
+
+     gpc: gpc@303a0000 {
+             compatible = "fsl,imx7d-gpc";
+             reg = <0x303a0000 0x1000>;
+             interrupt-controller;
+             interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
+             #interrupt-cells = <3>;
+             interrupt-parent = <&intc>;
+
+             pgc {
+                     #address-cells = <1>;
+                     #size-cells = <0>;
+
+                     pgc_pcie_phy: power-domain@3 {
+                             #power-domain-cells = <0>;
+
+                             reg = <IMX7_POWER_DOMAIN_PCIE_PHY>;
+                             power-supply = <&reg_1p0d>;
+                     };
+             };
+     };
+
+
+Specifying power domain for IP modules
+======================================
+
+IP cores belonging to a power domain should contain a 'power-domains'
+property that is a phandle for PGC node representing the domain.
+
+Example of a device that is part of the PCIE_PHY power domain:
+
+     pcie: pcie@33800000 {
+           reg = <0x33800000 0x4000>,
+                 <0x4ff00000 0x80000>;
+             /* ... */
+             power-domains = <&pgc_pcie_phy>;
+             /* ... */
+     };

diff --git a/include/dt-bindings/power/imx7-power.h b/include/dt-bindings/power/imx7-power.h
new file mode 100644
index 0000000..eb70023
--- /dev/null
+++ b/include/dt-bindings/power/imx7-power.h

@@ -0,0 +1,18 @@
+/*
+ *  Copyright (C) 2017 Impinj
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __DT_BINDINGS_IMX7_POWER_H__
+#define __DT_BINDINGS_IMX7_POWER_H__
+
+#define IMX7_POWER_DOMAIN_USB_HSIC_PHY       0
+#define IMX7_POWER_DOMAIN_USB_OTG2_PHY       1
+#define IMX7_POWER_DOMAIN_USB_OTG1_PHY       2
+#define IMX7_POWER_DOMAIN_PCIE_PHY   3
+#define IMX7_POWER_DOMAIN_MIPI_PHY   4

Nitpick: Probably better to define according to the reference manual
defined order.

0x800 ~ 0x83F : PGC for A7 core0
0x840 ~ 0x87F: PGC for A7 core1
0x880 ~ 0x8BF: PGC for A7 SCU
0xA00 ~ 0xA3F: PGC for fastmix/megamix
0xC00 ~ 0xC3F: PGC for MIPI PHY
0xC40 ~ 0xC7F: PGC for PCIE_PHY
0xC80 ~ 0xCBF: Reserved
0xCC0 ~ 0xCFF: Reserved
0xD00 ~ 0xD3F: PGC for USB HSIC PHY

You can drop A7 core/scu/fastmix/megamix as well.

Sure, will do.

BTW, i read some other SoC power domain implementations,
they keep the CPU domains although not used in kernel.
e.g.
include/dt-bindings/power/rk3288-power.h
include/soc/tegra/pmc.h

That probably is a good reference in case we may need them in the future.
And device tree actually is describe HW.
I wonder we may be better to keep them as well.

Regards
Dong Aisheng

Thanks,
Andrey Smirnov