From: Baolin Wang <baolin.wang@linaro.org>
To: adrian.hunter@intel.com, ulf.hansson@linaro.org,
zhang.lyra@gmail.com, orsonzhai@gmail.com, robh+dt@kernel.org,
mark.rutland@arm.com, arnd@arndb.de, olof@lixom.net
Cc: baolin.wang@linaro.org, vincent.guittot@linaro.org,
arm@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Subject: [PATCH v2 7/9] dt-bindings: mmc: sprd: Add PHY DLL delay documentation
Date: Tue, 4 Jun 2019 16:14:27 +0800 [thread overview]
Message-ID: <6caaa6afd1b69fc491c36c665a954becb50d616b.1559635435.git.baolin.wang@linaro.org> (raw)
In-Reply-To: <cover.1559635435.git.baolin.wang@linaro.org>
In-Reply-To: <cover.1559635435.git.baolin.wang@linaro.org>
Introduce some PHY DLL delays properties to help to sample the PHY clock.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
.../devicetree/bindings/mmc/sdhci-sprd.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-sprd.txt b/Documentation/devicetree/bindings/mmc/sdhci-sprd.txt
index a285c77..e675397 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-sprd.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-sprd.txt
@@ -20,6 +20,23 @@ Optional properties:
- assigned-clocks: the same with "sdio" clock
- assigned-clock-parents: the default parent of "sdio" clock
+PHY DLL delays are used to delay the data valid window, and align the window
+to sampling clock. PHY DLL delays can be configured by following properties,
+and each property contains 4 cells which are used to configure the clock data
+write line delay value, clock read command line delay value, clock read data
+positive edge delay value and clock read data negative edge delay value.
+Each cell's delay value unit is cycle of the PHY clock.
+
+- sprd,phy-delay-legacy: Delay value for legacy timing.
+- sprd,phy-delay-sd-highspeed: Delay value for SD high-speed timing.
+- sprd,phy-delay-sd-uhs-sdr50: Delay value for SD UHS SDR50 timing.
+- sprd,phy-delay-sd-uhs-sdr104: Delay value for SD UHS SDR50 timing.
+- sprd,phy-delay-mmc-highspeed: Delay value for MMC high-speed timing.
+- sprd,phy-delay-mmc-ddr52: Delay value for MMC DDR52 timing.
+- sprd,phy-delay-mmc-hs200: Delay value for MMC HS200 timing.
+- sprd,phy-delay-mmc-hs400: Delay value for MMC HS400 timing.
+- sprd,phy-delay-mmc-hs400es: Delay value for MMC HS400 enhanced strobe timing.
+
Examples:
sdio0: sdio@20600000 {
@@ -33,6 +50,7 @@ sdio0: sdio@20600000 {
assigned-clocks = <&ap_clk CLK_EMMC_2X>;
assigned-clock-parents = <&rpll CLK_RPLL_390M>;
+ sprd,phy-delay-sd-uhs-sdr104 = <0x3f 0x7f 0x2e 0x2e>;
bus-width = <8>;
non-removable;
no-sdio;
--
1.7.9.5
next prev parent reply other threads:[~2019-06-04 8:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-04 8:14 [PATCH v2 0/9] Add SD host controller support for SC9860 platform Baolin Wang
2019-06-04 8:14 ` [PATCH v2 1/9] mmc: sdhci-sprd: Check the enable clock's return value correctly Baolin Wang
2019-06-04 8:14 ` [PATCH v2 2/9] dt-bindings: mmc: sprd: Add another optional clock documentation Baolin Wang
2019-06-04 8:14 ` [PATCH v2 3/9] mmc: sdhci-sprd: Add optional gate clock support Baolin Wang
2019-06-04 8:14 ` [PATCH v2 4/9] mmc: sdhci-sprd: Implement the get_max_timeout_count() interface Baolin Wang
2019-06-04 8:14 ` [PATCH v2 5/9] mmc: sdhci-sprd: Add HS400 enhanced strobe mode Baolin Wang
2019-06-04 8:14 ` [PATCH v2 6/9] mmc: sdhci-sprd: Enable PHY DLL to make clock stable Baolin Wang
2019-06-04 8:14 ` Baolin Wang [this message]
2019-06-04 8:14 ` [PATCH v2 8/9] mmc: sdhci-sprd: Add PHY DLL delay configuration Baolin Wang
2019-06-04 8:14 ` [PATCH v2 9/9] arm64: dts: sprd: Add Spreadtrum SD host controller support Baolin Wang
2019-06-19 13:16 ` Olof Johansson
2019-06-07 11:02 ` [PATCH v2 0/9] Add SD host controller support for SC9860 platform Ulf Hansson
[not found] ` <15AEA3314E88B01E.21242@linux.kernel.org>
2019-07-05 22:29 ` [PATCH v2 1/9] mmc: sdhci-sprd: Check the enable clock's return value correctly Olof Johansson
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