linux-kernel - Re: [PATCH v7 1/2] dt-bindings: Add GPCv2 power gating driver

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Date:   Fri, 24 Mar 2017 14:32:16 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     Shawn Guo <shawnguo@...nel.org>, yurovsky@...il.com,
        Lucas Stach <l.stach@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/2] dt-bindings: Add GPCv2 power gating driver

On Tue, Mar 21, 2017 at 07:50:03AM -0700, Andrey Smirnov wrote:
> Add DT bindings for power domain driver for GPCv2 IP block found in
> i.MX7 SoCs.
> 
> Cc: yurovsky@...il.com
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: Dong Aisheng <dongas86@...il.com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
>  .../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@...a0000 {
> +		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@...00000 {
> +	      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.

> +
> +#endif
> -- 
> 2.9.3
> 

Regards
Dong Aisheng