linux-kernel - Re: [PATCH 1/3] dt-bindings: mmc: sdhci-am654: Update Output tap delay binding

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Message-ID: <20200115015037.GA26114@bogus>
Date:   Tue, 14 Jan 2020 19:50:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, ulf.hansson@...aro.org,
        adrian.hunter@...el.com
Subject: Re: [PATCH 1/3] dt-bindings: mmc: sdhci-am654: Update Output tap
 delay binding

On Wed, Jan 08, 2020 at 08:39:18PM +0530, Faiz Abbas wrote:
> According to latest AM65x Data Manual[1], a different output tap delay
> value is recommended for all speed modes. Therefore, replace the
> ti,otap-del-sel binding with one ti,otap-del-sel- for each MMC/SD speed
> mode.
> 
> [1] http://www.ti.com/lit/gpn/am6526
> 
> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> ---
>  .../devicetree/bindings/mmc/sdhci-am654.txt   | 21 +++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-am654.txt b/Documentation/devicetree/bindings/mmc/sdhci-am654.txt
> index 50e87df47971..c6ccecb9ae5a 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-am654.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-am654.txt
> @@ -18,7 +18,20 @@ Required Properties:
>  	- clocks: Handles to the clock inputs.
>  	- clock-names: Tuple including "clk_xin" and "clk_ahb"
>  	- interrupts: Interrupt specifiers
> -	- ti,otap-del-sel: Output Tap Delay select
> +	Output tap delay for each speed mode:
> +	- ti,otap-del-sel-legacy
> +	- ti,otap-del-sel-mmc-hs
> +	- ti,otap-del-sel-sd-hs
> +	- ti,otap-del-sel-sdr12
> +	- ti,otap-del-sel-sdr25
> +	- ti,otap-del-sel-sdr50
> +	- ti,otap-del-sel-sdr104
> +	- ti,otap-del-sel-ddr50
> +	- ti,otap-del-sel-ddr52
> +	- ti,otap-del-sel-hs200
> +	- ti,otap-del-sel-hs400
> +	  These bindings must be provided otherwise the driver will disable the
> +	  corresponding speed mode (i.e. all nodes must provide at least -legacy)

Why not just extend the existing property to be an array. We already 
have properties to enable/disable speed modes.

>  
>  Optional Properties (Required for ti,am654-sdhci-5.1 and ti,j721e-sdhci-8bit):
>  	- ti,trm-icp: DLL trim select
> @@ -38,6 +51,10 @@ Example:
>  		interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
>  		sdhci-caps-mask = <0x80000007 0x0>;
>  		mmc-ddr-1_8v;
> -		ti,otap-del-sel = <0x2>;
> +		ti,otap-del-sel-legacy = <0x0>;
> +		ti,otap-del-sel-mmc-hs = <0x0>;
> +		ti,otap-del-sel-ddr52 = <0x5>;
> +		ti,otap-del-sel-hs200 = <0x5>;
> +		ti,otap-del-sel-hs400 = <0x0>;
>  		ti,trm-icp = <0x8>;
>  	};
> -- 
> 2.19.2
>