From: Lucas Stach <l.stach@pengutronix.de>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Haibo Chen <haibo.chen@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>,
NXP Linux Team <linux-imx@nxp.com>,
kernel@pengutronix.de, linux-mmc@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag
Date: Mon, 10 May 2021 21:03:58 +0200 [thread overview]
Message-ID: <20210510190400.105162-1-l.stach@pengutronix.de> (raw)
From: Lucas Stach <dev@lynxeye.de>
HS400 requires a data strobe line in addition to the usual MMC signal
lines. If a board design neglects to wire up this signal, HS400 mode is
not available, even if both the controller and the eMMC are claiming to
support this mode. Add a DT flag to allow boards to disable the HS400
support in this case.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Rob Herring <robh@kernel.org>
---
Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index e141330c1114..ac80d09df3a9 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -220,6 +220,11 @@ properties:
description:
eMMC HS400 enhanced strobe mode is supported
+ no-mmc-hs400:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ All eMMC HS400 modes are not supported.
+
dsr:
description:
Value the card Driver Stage Register (DSR) should be programmed
--
2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Lucas Stach <l.stach@pengutronix.de>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Haibo Chen <haibo.chen@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>,
NXP Linux Team <linux-imx@nxp.com>,
kernel@pengutronix.de, linux-mmc@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag
Date: Mon, 10 May 2021 21:03:58 +0200 [thread overview]
Message-ID: <20210510190400.105162-1-l.stach@pengutronix.de> (raw)
From: Lucas Stach <dev@lynxeye.de>
HS400 requires a data strobe line in addition to the usual MMC signal
lines. If a board design neglects to wire up this signal, HS400 mode is
not available, even if both the controller and the eMMC are claiming to
support this mode. Add a DT flag to allow boards to disable the HS400
support in this case.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Rob Herring <robh@kernel.org>
---
Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index e141330c1114..ac80d09df3a9 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -220,6 +220,11 @@ properties:
description:
eMMC HS400 enhanced strobe mode is supported
+ no-mmc-hs400:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ All eMMC HS400 modes are not supported.
+
dsr:
description:
Value the card Driver Stage Register (DSR) should be programmed
--
2.31.1
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next reply other threads:[~2021-05-10 19:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 19:03 Lucas Stach [this message]
2021-05-10 19:03 ` [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag Lucas Stach
2021-05-10 19:03 ` [PATCH v2 2/3] mmc: sdhci-esdhc-imx: advertise HS400 mode through MMC caps Lucas Stach
2021-05-10 19:03 ` Lucas Stach
2021-05-11 3:00 ` Bough Chen
2021-05-11 3:00 ` Bough Chen
2021-05-11 8:18 ` Lucas Stach
2021-05-11 8:18 ` Lucas Stach
2021-05-11 12:40 ` Adrian Hunter
2021-05-11 12:40 ` Adrian Hunter
2021-05-12 2:23 ` Bough Chen
2021-05-12 2:23 ` Bough Chen
2021-05-24 14:10 ` Ulf Hansson
2021-05-24 14:10 ` Ulf Hansson
2021-05-10 19:04 ` [PATCH v2 3/3] mmc: core: add support for disabling HS400 mode via DT Lucas Stach
2021-05-10 19:04 ` Lucas Stach
2021-05-11 11:14 ` Ulf Hansson
2021-05-11 11:14 ` Ulf Hansson
2021-05-11 11:54 ` Lucas Stach
2021-05-11 11:54 ` Lucas Stach
2021-05-11 12:19 ` Ulf Hansson
2021-05-11 12:19 ` Ulf Hansson
2021-05-24 14:10 ` Ulf Hansson
2021-05-24 14:10 ` Ulf Hansson
2021-05-24 14:10 ` [PATCH v2 1/3] dt-bindings: mmc: add no-mmc-hs400 flag Ulf Hansson
2021-05-24 14:10 ` Ulf Hansson
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