linux-kernel - Re: [PATCH v2 2/2] dt-bindings: ata: add DT bindings for MediaTek SATA controller

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Date:   Fri, 11 Aug 2017 10:25:56 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Hans de Goede <hdegoede@...hat.com>, Tejun Heo <tj@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
        Long Cheng <long.cheng@...iatek.com>
Subject: Re: [PATCH v2 2/2] dt-bindings: ata: add DT bindings for MediaTek
 SATA controller

On Thu, 2017-08-10 at 15:51 -0500, Rob Herring wrote:
> On Mon, Aug 07, 2017 at 05:52:21PM +0800, Ryder Lee wrote:
> > Add DT bindings for the onboard SATA controller present on the MediaTek
> > SoCs.
> > 
> > Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/ata/ahci-mtk.txt | 50 ++++++++++++++++++++++
> >  1 file changed, 50 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/ata/ahci-mtk.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/ata/ahci-mtk.txt b/Documentation/devicetree/bindings/ata/ahci-mtk.txt
> > new file mode 100644
> > index 0000000..ed04dfc
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/ata/ahci-mtk.txt
> > @@ -0,0 +1,50 @@
> > +MediaTek Seria ATA controller
> 
> s/Seria/Serial/

Okay.
> > +
> > +Required properties:
> > + - compatible	   : Must be "mediatek,ahci".
> 
> SoC specific compatible strings please.

Okay.

> > + - reg		   : Physical base addresses and length of register sets.
> > + - interrupts	   : Interrupt associated with the SATA device.
> > + - interrupt-names : Associated name must be: "hostc".
> > + - clocks	   : A list of phandle and clock specifier pairs, one for each
> > +		     entry in clock-names.
> > + - clock-names	   : Associated names must be: "ahb", "axi", "asic", "rbc", "pm".
> > + - phys		   : A phandle and PHY specifier pair for the PHY port.
> > + - phy-names	   : Associated name must be: "sata-phy".
> > + - ports-implemented : Mask that indicates which ports that the HBA supports
> > +		       are available for software to use. Useful if PORTS_IMPL
> > +		       is not programmed by the BIOS, which is true with some
> > +		       embedded SOC's.
> 
> Do you have a variable number of ports and need this in DT? Because it 
> looks like you only define having a single phy.

We use this property to set PORTS_IMPL register value to 0x1, or there
is no available port for use.

> But this is a standard prop, so you can just say "see 
> ./ahci-platform.txt"

Okay.

> > +
> > +Optional properties:
> > + - power-domains   : A phandle and power domain specifier pair to the power
> > +		     domain which is responsible for collapsing and restoring
> > +		     power to the peripheral.
> > + - resets	   : Must contain an entry for each entry in reset-names.
> > +		     See ../reset/reset.txt for details.
> > + - reset-names	   : Associated names must be: "axi", "sw", "reg".
> > + - mediatek,phy-mode : A phandle to the system controller, used to enable
> > +		       SATA function.
> > +
> > +Example:
> > +
> > +	sata: sata@...00000 {
> > +		compatible = "mediatek,ahci";
> > +		reg = <0 0x1a200000 0 0x1100>;
> > +		interrupts = <GIC_SPI 233 IRQ_TYPE_LEVEL_HIGH>;
> > +		interrupt-names = "hostc";
> > +		clocks = <&pciesys CLK_SATA_AHB_EN>,
> > +			 <&pciesys CLK_SATA_AXI_EN>,
> > +			 <&pciesys CLK_SATA_ASIC_EN>,
> > +			 <&pciesys CLK_SATA_RBC_EN>,
> > +			 <&pciesys CLK_SATA_PM_EN>;
> > +		clock-names = "ahb", "axi", "asic", "rbc", "pm";
> > +		phys = <&u3port1 PHY_TYPE_SATA>;
> > +		phy-names = "sata-phy";
> > +		ports-implemented = <0x1>;
> > +		power-domains = <&scpsys MT7622_POWER_DOMAIN_HIF0>;
> > +		resets = <&pciesys MT7622_SATA_AXI_BUS_RST>,
> > +			 <&pciesys MT7622_SATA_PHY_SW_RST>,
> > +			 <&pciesys MT7622_SATA_PHY_REG_RST>;
> > +		reset-names = "axi", "sw", "reg";
> > +		mediatek,phy-mode = <&pciesys>;
> > +	};
> > -- 
> > 1.9.1
> >