On 21 March 2017 at 15:33, Piotr Sroka <piotrs@xxxxxxxxxxx> wrote:
> DTS properties are used instead of fixed data
> because PHY settings can be different for different chips/boards.
> Add description of new DLL PHY delays.
>
> Signed-off-by: Piotr Sroka <piotrs@xxxxxxxxxxx>
Thanks, applied for next!
Kind regards
Uffe
> ---
> Changes for v2:
> - file was created in v2. It was a part of driver source file patch.
> - most delays were moved from dts file
> to data associated with an SoC specific compatible
> - description of delays was updated to be more clearly
> ---
> Changes for v3:
> - move all delays back to dts because they are also boards dependent
> - prefix all of the Cadence-specific properties with cdns prefix
> ---
> Changes for v4:
> - change the beginning of the commit subject
> ---
> Changes for v5:
> - change name of property to be consistent with timing modes
> available in Linux
> ---
> .../devicetree/bindings/mmc/sdhci-cadence.txt | 48 ++++++++++++++++++++++
> 1 file changed, 48 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
> index c0f37cb..fa423c2 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
> @@ -19,6 +19,53 @@ if supported. See mmc.txt for details.
> - mmc-hs400-1_8v
> - mmc-hs400-1_2v
>
> +Some PHY delays can be configured by following properties.
> +PHY DLL input delays:
> +They are used to delay the data valid window, and align the window
> +to sampling clock. The delay starts from 5ns (for delay parameter equal to 0)
> +and it is increased by 2.5ns in each step.
> +- cdns,phy-input-delay-sd-highspeed:
> + Value of the delay in the input path for SD high-speed timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-legacy:
> + Value of the delay in the input path for legacy timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-sd-uhs-sdr12:
> + Value of the delay in the input path for SD UHS SDR12 timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-sd-uhs-sdr25:
> + Value of the delay in the input path for SD UHS SDR25 timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-sd-uhs-sdr50:
> + Value of the delay in the input path for SD UHS SDR50 timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-sd-uhs-ddr50:
> + Value of the delay in the input path for SD UHS DDR50 timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-mmc-highspeed:
> + Value of the delay in the input path for MMC high-speed timing
> + Valid range = [0:0x1F].
> +- cdns,phy-input-delay-mmc-ddr:
> + Value of the delay in the input path for eMMC high-speed DDR timing
> + Valid range = [0:0x1F].
> +
> +PHY DLL clock delays:
> +Each delay property represents the fraction of the clock period.
> +The approximate delay value will be
> +(<delay property value>/128)*sdmclk_clock_period.
> +- cdns,phy-dll-delay-sdclk:
> + Value of the delay introduced on the sdclk output
> + for all modes except HS200, HS400 and HS400_ES.
> + Valid range = [0:0x7F].
> +- cdns,phy-dll-delay-sdclk-hsmmc:
> + Value of the delay introduced on the sdclk output
> + for HS200, HS400 and HS400_ES speed modes.
> + Valid range = [0:0x7F].
> +- cdns,phy-dll-delay-strobe:
> + Value of the delay introduced on the dat_strobe input
> + used in HS400 / HS400_ES speed modes.
> + Valid range = [0:0x7F].
> +
> Example:
> emmc: sdhci@5a000000 {
> compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
> @@ -29,4 +76,5 @@ Example:
> mmc-ddr-1_8v;
> mmc-hs200-1_8v;
> mmc-hs400-1_8v;
> + cdns,phy-dll-delay-sdclk = <0>;
> };
> --
> 2.2.2
>
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