linux-kernel - Re: [PATCH v3 1/2] dt-bindings: ufs: Add bindings for Cadence UFS

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Message-ID: <38727B36-5200-4A3A-B3D1-88ADC5381622@global.cadence.com>
Date:   Tue, 14 Aug 2018 07:21:40 +0000
From:   Janek Kotas <jank@...ence.com>
To:     Rob Herring <robh@...nel.org>
CC:     Janek Kotas <jank@...ence.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "vinholikatti@...il.com" <vinholikatti@...il.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] dt-bindings: ufs: Add bindings for Cadence UFS



> On 13 Aug 2018, at 19:37, Rob Herring <robh@...nel.org> wrote:
> 

> 
> On Thu, Aug 09, 2018 at 01:25:15PM +0000, Janek Kotas wrote:
>> This patch adds a DT binding documentation for
>> Cadence UFS Host Controller.
>> 
>> Signed-off-by: Jan Kotas <jank@...ence.com>
>> ---
>> .../devicetree/bindings/ufs/cdns,ufshc.txt         | 31 ++++++++++++++++++++++
>> 1 file changed, 31 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
>> 
>> diff --git a/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt b/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
>> new file mode 100644
>> index 00000000..a04a4989
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
>> @@ -0,0 +1,31 @@
>> +* Cadence Universal Flash Storage (UFS) Controller
>> +
>> +UFS nodes are defined to describe on-chip UFS host controllers.
>> +Each UFS controller instance should have its own node.
>> +Please see the ufshcd-pltfrm.txt for a list of all available properties.
>> +
>> +Required properties:
>> +- compatible	: Compatible list, contains the following controller:
>> +			"cdns,ufshc"
>> +		  complemented with the JEDEC version:
>> +			"jedec,ufs-2.0"
>> +
>> +- reg		: Address and length of the UFS register set.
>> +- interrupts	: One interrupt mapping.
>> +- freq-table-hz	: Clock frequency table.
>> +		  See the ufshcd-pltfrm.txt for details.
>> +- clocks	: List of phandle and clock specifier pairs.
>> +- clock-names	: List of clock input name strings sorted in the same
>> +		  order as the clocks property. "core_clk" is mandatory.
>> +		  Depending on a type of a PHY,
>> +		  the "phy_clk" clock can also be added, if needed.
> 
> Unfortunately, you went the wrong direction. The '_clk' part is 
> redundant. Just ‘core’ and 'phy'.

I understand, however the rest of the ufs framework uses the '_clk' suffix:
drivers/scsi/ufs/ufshcd.c:6999:

if (!IS_ERR_OR_NULL(clki->clk)) {			
	if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))			
		continue;

I wanted it to be consistent, with the rest of the UFS drivers.

Regards,
Jan

> With that,
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> 
>> +
>> +Example:
>> +	ufs@...30000 {
>> +		compatible = "cdns,ufshc", "jedec,ufs-2.0";
>> +		reg = <0xfd030000 0x10000>;
>> +		interrupts = <0 1 IRQ_TYPE_LEVEL_HIGH>;
>> +		freq-table-hz = <0 0>, <0 0>;
>> +		clocks = <&ufs_core_clk>, <&ufs_phy_clk>;
>> +		clock-names = "core_clk", "phy_clk";
>> +	};
>> -- 
>> 2.15.0
>> 
>> 
>> --
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