linux-kernel - Re: [RFC PATCH 2/3] dt: bindings: Add SD tap value properties details

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Message-ID: <20180607124743.fqo7f7nxonn2k3b5@lakrids.cambridge.arm.com>
Date:   Thu, 7 Jun 2018 13:47:43 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     robh+dt@...nel.org, catalin.marinas@....com, will.deacon@....com,
        mdf@...nel.org, stefan.krsmanovic@...ios.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        adrian.hunter@...el.com, michal.simek@...inx.com,
        ulf.hansson@...aro.org
Subject: Re: [RFC PATCH 2/3] dt: bindings: Add SD tap value properties details

On Thu, Jun 07, 2018 at 05:41:39PM +0530, Manish Narani wrote:
> This patch adds details of SD tap value properties in device tree.
> 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  .../devicetree/bindings/mmc/arasan,sdhci.txt       | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index 60481bf..0e08877 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -15,6 +15,8 @@ Required Properties:
>      - "arasan,sdhci-5.1": generic Arasan SDHCI 5.1 PHY
>      - "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1": rk3399 eMMC PHY
>        For this device it is strongly suggested to include arasan,soc-ctl-syscon.
> +    - "xlnx,zynqmp-8.9a": Xilinx ZynqMP Arasan SDHCI 8.9a PHY
> +      For this device it is strongly suggested to include arasan,soc-ctl-syscon.
>    - reg: From mmc bindings: Register location and length.
>    - clocks: From clock bindings: Handles to clock inputs.
>    - clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
> @@ -26,6 +28,30 @@ Required Properties for "arasan,sdhci-5.1":
>    - phys: From PHY bindings: Phandle for the Generic PHY for arasan.
>    - phy-names:  MUST be "phy_arasan".
> 
> +Required Properties for "xlnx,zynqmp-8.9a":
> +  - xlnx,mio_bank: The value will be 0/1/2 depending on MIO bank selection.

For all of these properties, please s/_/-/, folowing the usual property
name conventions.

It's not clear to me why you need this property. The code in patch 3
only seems to use this to determine which properties to read, choosing
between <prop>_b0 or <prop>_b2. I don't see why you dont have the base
<prop> alone...

Is this a HW detail, or configuration that you prefer?

> +  - xlnx,device_id: Unique Id of the device, value will be 0/1.

What's this used for?

> +  - xlnx,itap_delay_sd_hsd: Input Tap Delay for SD HS.

What unit at hese delays in?

Please follow the conventions in
Documentation/devicetree/bindings/property-units.txt.

> +  - xlnx,itap_delay_sdr25: Input Tap Delay for SDR25.
> +  - xlnx,itap_delay_sdr50: Input Tap Delay for SDR50.
> +  - xlnx,itap_delay_sdr104_b0: Input Tap Delay for SDR104.
> +  - xlnx,itap_delay_sdr104_b2: Input Tap Delay for SDR104.

As above, Given you have to specify the bank, I don't see why you need
multiple properties.

Thanks,
Mark.

> +  - xlnx,itap_delay_sd_ddr50: Input Tap Delay for SD DDR50.
> +  - xlnx,itap_delay_mmc_hsd: Input Tap Delay for MMC HS.
> +  - xlnx,itap_delay_mmc_ddr50: Input Tap Delay for MMC DDR50.
> +  - xlnx,itap_delay_mmc_hs200_b0: Input Tap Delay for MMC HS200.
> +  - xlnx,itap_delay_mmc_hs200_b2: Input Tap Delay for MMC HS200.
> +  - xlnx,otap_delay_sd_hsd: Output Tap Delay for SD HS.
> +  - xlnx,otap_delay_sdr25: Output Tap Delay for SDR25.
> +  - xlnx,otap_delay_sdr50: Output Tap Delay for SDR50.
> +  - xlnx,otap_delay_sdr104_b0: Output Tap Delay for SDR104.
> +  - xlnx,otap_delay_sdr104_b2: Output Tap Delay for SDR104.
> +  - xlnx,otap_delay_sd_ddr50: Output Tap Delay for DDR50.
> +  - xlnx,otap_delay_mmc_hsd: Output Tap Delay for MMC HS.
> +  - xlnx,otap_delay_mmc_ddr50: Output Tap Delay for MMC DDR50.
> +  - xlnx,otap_delay_mmc_hs200_b0: Output Tap Delay for MMC HS200.
> +  - xlnx,otap_delay_mmc_hs200_b2: Output Tap Delay for MMC HS200.
> +
>  Optional Properties:
>    - arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
>      used to access core corecfg registers.  Offsets of registers in this
> --
> 2.7.4
> 
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