[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
is optional because not all the SoCs need them but at least for Armada
7K/8K it is actually mandatory.

The binding documentation is updating accordingly.

Without this patch the kernel hand during boot if the mvpp2.2 network
driver was not present in the kernel. Indeed the clock needed by the
xenon controller was set by the network driver.

Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
functionality)"
CC: Stable <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Signed-off-by: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
Hi Ulf and Adrian,

This patch should be merged in 4.14-rc, as it fixes real issues.

This patch maye looks like just as a nice clean-up but it is not. On
the earlier version of the series adding the support for the xenon
controller there was already this axi bus clock. But at this moment
the documentation for the clock on the Armada 7K/8K was missing and
there was no driver for it, so we just use the clock set by the
bootloader and never change them that's why it worked without any
visible problem.

Then as explained in the commit log the network driver enabled the
clock for us, and it happened that it was setup before the xenon
driver. It is only thanks the new information we received on the
clocks of the Sov and with more exhaustive testes that we found this
issue and the fix for it.

Thanks,

Gregory

Changelog:
v1->v2:
 - manage the -EPROBE_DEFER case
 - remove warning message when axi clock is not present
 - remove useless test before clk_disable_unprepare()

 .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
 drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
 drivers/mmc/host/sdhci-xenon.h                     |  1 +
 3 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
index b878a1e305af..ed1456f5c94d 100644
--- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
@@ -16,11 +16,13 @@ Required Properties:
 
 - clocks:
   Array of clocks required for SDHC.
-  Require at least input clock for Xenon IP core.
+  Require at least input clock for Xenon IP core. For Armada AP806 and
+  CP110, the AXI clock is also mandatory.
 
 - clock-names:
   Array of names corresponding to clocks property.
   The input clock for Xenon IP core should be named as "core".
+  The input clock for the AXI bus must be named as "axi".
 
 - reg:
   * For "marvell,armada-3700-sdhci", two register areas.
@@ -106,8 +108,8 @@ Example:
 		compatible = "marvell,armada-ap806-sdhci";
 		reg = <0xaa0000 0x1000>;
 		interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
-		clocks = <&emmc_clk>;
-		clock-names = "core";
+		clocks = <&emmc_clk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-phy-slow-mode;
 		marvell,xenon-tun-count = <11>;
@@ -126,8 +128,8 @@ Example:
 		interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
 		vqmmc-supply = <&sd_vqmmc_regulator>;
 		vmmc-supply = <&sd_vmmc_regulator>;
-		clocks = <&sdclk>;
-		clock-names = "core";
+		clocks = <&sdclk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-tun-count = <9>;
 	};
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 2eec2e652c53..15f912d08a4c 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_host *host;
+	struct xenon_priv *priv;
 	int err;
 
 	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
@@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
 		return PTR_ERR(host);
 
 	pltfm_host = sdhci_priv(host);
+	priv = sdhci_pltfm_priv(pltfm_host);
 
 	/*
 	 * Link Xenon specific mmc_host_ops function,
@@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
 	if (err)
 		goto free_pltfm;
 
+	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
+	if (IS_ERR(priv->axi_clk)) {
+		err = PTR_ERR(priv->axi_clk);
+		if (err == -EPROBE_DEFER)
+			goto err_clk;
+		priv->axi_clk = NULL;
+	} else {
+		err = clk_prepare_enable(priv->axi_clk);
+		if (err)
+			goto err_clk;
+	}
+
 	err = mmc_of_parse(host->mmc);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	sdhci_get_of_property(pdev);
 
@@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
 	/* Xenon specific dt parse */
 	err = xenon_probe_dt(pdev);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	err = xenon_sdhc_prepare(host);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
@@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
 	xenon_sdhc_unprepare(host);
+err_clk_axi:
+	clk_disable_unprepare(priv->axi_clk);
 err_clk:
 	clk_disable_unprepare(pltfm_host->clk);
 free_pltfm:
@@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
 	sdhci_remove_host(host, 0);
 
 	xenon_sdhc_unprepare(host);
-
+	clk_disable_unprepare(priv->axi_clk);
 	clk_disable_unprepare(pltfm_host->clk);
 
 	sdhci_pltfm_free(pdev);
diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 2bc0510c0769..9994995c7c56 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -83,6 +83,7 @@ struct xenon_priv {
 	unsigned char	bus_width;
 	unsigned char	timing;
 	unsigned int	clock;
+	struct clk      *axi_clk;
 
 	int		phy_type;
 	/*
-- 
2.14.1

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
is optional because not all the SoCs need them but at least for Armada
7K/8K it is actually mandatory.

The binding documentation is updating accordingly.

Without this patch the kernel hand during boot if the mvpp2.2 network
driver was not present in the kernel. Indeed the clock needed by the
xenon controller was set by the network driver.

Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
functionality)"
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
Hi Ulf and Adrian,

This patch should be merged in 4.14-rc, as it fixes real issues.

This patch maye looks like just as a nice clean-up but it is not. On
the earlier version of the series adding the support for the xenon
controller there was already this axi bus clock. But at this moment
the documentation for the clock on the Armada 7K/8K was missing and
there was no driver for it, so we just use the clock set by the
bootloader and never change them that's why it worked without any
visible problem.

Then as explained in the commit log the network driver enabled the
clock for us, and it happened that it was setup before the xenon
driver. It is only thanks the new information we received on the
clocks of the Sov and with more exhaustive testes that we found this
issue and the fix for it.

Thanks,

Gregory

Changelog:
v1->v2:
 - manage the -EPROBE_DEFER case
 - remove warning message when axi clock is not present
 - remove useless test before clk_disable_unprepare()

 .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
 drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
 drivers/mmc/host/sdhci-xenon.h                     |  1 +
 3 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
index b878a1e305af..ed1456f5c94d 100644
--- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
@@ -16,11 +16,13 @@ Required Properties:
 
 - clocks:
   Array of clocks required for SDHC.
-  Require at least input clock for Xenon IP core.
+  Require at least input clock for Xenon IP core. For Armada AP806 and
+  CP110, the AXI clock is also mandatory.
 
 - clock-names:
   Array of names corresponding to clocks property.
   The input clock for Xenon IP core should be named as "core".
+  The input clock for the AXI bus must be named as "axi".
 
 - reg:
   * For "marvell,armada-3700-sdhci", two register areas.
@@ -106,8 +108,8 @@ Example:
 		compatible = "marvell,armada-ap806-sdhci";
 		reg = <0xaa0000 0x1000>;
 		interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
-		clocks = <&emmc_clk>;
-		clock-names = "core";
+		clocks = <&emmc_clk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-phy-slow-mode;
 		marvell,xenon-tun-count = <11>;
@@ -126,8 +128,8 @@ Example:
 		interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
 		vqmmc-supply = <&sd_vqmmc_regulator>;
 		vmmc-supply = <&sd_vmmc_regulator>;
-		clocks = <&sdclk>;
-		clock-names = "core";
+		clocks = <&sdclk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-tun-count = <9>;
 	};
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 2eec2e652c53..15f912d08a4c 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_host *host;
+	struct xenon_priv *priv;
 	int err;
 
 	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
@@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
 		return PTR_ERR(host);
 
 	pltfm_host = sdhci_priv(host);
+	priv = sdhci_pltfm_priv(pltfm_host);
 
 	/*
 	 * Link Xenon specific mmc_host_ops function,
@@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
 	if (err)
 		goto free_pltfm;
 
+	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
+	if (IS_ERR(priv->axi_clk)) {
+		err = PTR_ERR(priv->axi_clk);
+		if (err == -EPROBE_DEFER)
+			goto err_clk;
+		priv->axi_clk = NULL;
+	} else {
+		err = clk_prepare_enable(priv->axi_clk);
+		if (err)
+			goto err_clk;
+	}
+
 	err = mmc_of_parse(host->mmc);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	sdhci_get_of_property(pdev);
 
@@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
 	/* Xenon specific dt parse */
 	err = xenon_probe_dt(pdev);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	err = xenon_sdhc_prepare(host);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
@@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
 	xenon_sdhc_unprepare(host);
+err_clk_axi:
+	clk_disable_unprepare(priv->axi_clk);
 err_clk:
 	clk_disable_unprepare(pltfm_host->clk);
 free_pltfm:
@@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
 	sdhci_remove_host(host, 0);
 
 	xenon_sdhc_unprepare(host);
-
+	clk_disable_unprepare(priv->axi_clk);
 	clk_disable_unprepare(pltfm_host->clk);
 
 	sdhci_pltfm_free(pdev);
diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 2bc0510c0769..9994995c7c56 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -83,6 +83,7 @@ struct xenon_priv {
 	unsigned char	bus_width;
 	unsigned char	timing;
 	unsigned int	clock;
+	struct clk      *axi_clk;
 
 	int		phy_type;
 	/*
-- 
2.14.1

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
is optional because not all the SoCs need them but at least for Armada
7K/8K it is actually mandatory.

The binding documentation is updating accordingly.

Without this patch the kernel hand during boot if the mvpp2.2 network
driver was not present in the kernel. Indeed the clock needed by the
xenon controller was set by the network driver.

Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
functionality)"
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
Hi Ulf and Adrian,

This patch should be merged in 4.14-rc, as it fixes real issues.

This patch maye looks like just as a nice clean-up but it is not. On
the earlier version of the series adding the support for the xenon
controller there was already this axi bus clock. But at this moment
the documentation for the clock on the Armada 7K/8K was missing and
there was no driver for it, so we just use the clock set by the
bootloader and never change them that's why it worked without any
visible problem.

Then as explained in the commit log the network driver enabled the
clock for us, and it happened that it was setup before the xenon
driver. It is only thanks the new information we received on the
clocks of the Sov and with more exhaustive testes that we found this
issue and the fix for it.

Thanks,

Gregory

Changelog:
v1->v2:
 - manage the -EPROBE_DEFER case
 - remove warning message when axi clock is not present
 - remove useless test before clk_disable_unprepare()

 .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
 drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
 drivers/mmc/host/sdhci-xenon.h                     |  1 +
 3 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
index b878a1e305af..ed1456f5c94d 100644
--- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
@@ -16,11 +16,13 @@ Required Properties:
 
 - clocks:
   Array of clocks required for SDHC.
-  Require at least input clock for Xenon IP core.
+  Require at least input clock for Xenon IP core. For Armada AP806 and
+  CP110, the AXI clock is also mandatory.
 
 - clock-names:
   Array of names corresponding to clocks property.
   The input clock for Xenon IP core should be named as "core".
+  The input clock for the AXI bus must be named as "axi".
 
 - reg:
   * For "marvell,armada-3700-sdhci", two register areas.
@@ -106,8 +108,8 @@ Example:
 		compatible = "marvell,armada-ap806-sdhci";
 		reg = <0xaa0000 0x1000>;
 		interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
-		clocks = <&emmc_clk>;
-		clock-names = "core";
+		clocks = <&emmc_clk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-phy-slow-mode;
 		marvell,xenon-tun-count = <11>;
@@ -126,8 +128,8 @@ Example:
 		interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
 		vqmmc-supply = <&sd_vqmmc_regulator>;
 		vmmc-supply = <&sd_vmmc_regulator>;
-		clocks = <&sdclk>;
-		clock-names = "core";
+		clocks = <&sdclk>, <&axi_clk>;
+		clock-names = "core", "axi";
 		bus-width = <4>;
 		marvell,xenon-tun-count = <9>;
 	};
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 2eec2e652c53..15f912d08a4c 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_host *host;
+	struct xenon_priv *priv;
 	int err;
 
 	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
@@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
 		return PTR_ERR(host);
 
 	pltfm_host = sdhci_priv(host);
+	priv = sdhci_pltfm_priv(pltfm_host);
 
 	/*
 	 * Link Xenon specific mmc_host_ops function,
@@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
 	if (err)
 		goto free_pltfm;
 
+	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
+	if (IS_ERR(priv->axi_clk)) {
+		err = PTR_ERR(priv->axi_clk);
+		if (err == -EPROBE_DEFER)
+			goto err_clk;
+		priv->axi_clk = NULL;
+	} else {
+		err = clk_prepare_enable(priv->axi_clk);
+		if (err)
+			goto err_clk;
+	}
+
 	err = mmc_of_parse(host->mmc);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	sdhci_get_of_property(pdev);
 
@@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
 	/* Xenon specific dt parse */
 	err = xenon_probe_dt(pdev);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	err = xenon_sdhc_prepare(host);
 	if (err)
-		goto err_clk;
+		goto err_clk_axi;
 
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
@@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_put_noidle(&pdev->dev);
 	xenon_sdhc_unprepare(host);
+err_clk_axi:
+	clk_disable_unprepare(priv->axi_clk);
 err_clk:
 	clk_disable_unprepare(pltfm_host->clk);
 free_pltfm:
@@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
 	sdhci_remove_host(host, 0);
 
 	xenon_sdhc_unprepare(host);
-
+	clk_disable_unprepare(priv->axi_clk);
 	clk_disable_unprepare(pltfm_host->clk);
 
 	sdhci_pltfm_free(pdev);
diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 2bc0510c0769..9994995c7c56 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -83,6 +83,7 @@ struct xenon_priv {
 	unsigned char	bus_width;
 	unsigned char	timing;
 	unsigned int	clock;
+	struct clk      *axi_clk;
 
 	int		phy_type;
 	/*
-- 
2.14.1

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[zhoujie wu]

Hi Gregory,
I tested this v2 patch on my armada3700 board.

Tested-by: Zhoujie Wu <zjwu-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>

On Fri, Sep 29, 2017 at 6:04 AM, Gregory CLEMENT
<gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:
> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
>
> The binding documentation is updating accordingly.
>
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
>
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
> Hi Ulf and Adrian,
>
> This patch should be merged in 4.14-rc, as it fixes real issues.
>
> This patch maye looks like just as a nice clean-up but it is not. On
> the earlier version of the series adding the support for the xenon
> controller there was already this axi bus clock. But at this moment
> the documentation for the clock on the Armada 7K/8K was missing and
> there was no driver for it, so we just use the clock set by the
> bootloader and never change them that's why it worked without any
> visible problem.
>
> Then as explained in the commit log the network driver enabled the
> clock for us, and it happened that it was setup before the xenon
> driver. It is only thanks the new information we received on the
> clocks of the Sov and with more exhaustive testes that we found this
> issue and the fix for it.
>
> Thanks,
>
> Gregory
>
> Changelog:
> v1->v2:
>  - manage the -EPROBE_DEFER case
>  - remove warning message when axi clock is not present
>  - remove useless test before clk_disable_unprepare()
>
>  .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
>  drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
>  drivers/mmc/host/sdhci-xenon.h                     |  1 +
>  3 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> index b878a1e305af..ed1456f5c94d 100644
> --- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> @@ -16,11 +16,13 @@ Required Properties:
>
>  - clocks:
>    Array of clocks required for SDHC.
> -  Require at least input clock for Xenon IP core.
> +  Require at least input clock for Xenon IP core. For Armada AP806 and
> +  CP110, the AXI clock is also mandatory.
>
>  - clock-names:
>    Array of names corresponding to clocks property.
>    The input clock for Xenon IP core should be named as "core".
> +  The input clock for the AXI bus must be named as "axi".
>
>  - reg:
>    * For "marvell,armada-3700-sdhci", two register areas.
> @@ -106,8 +108,8 @@ Example:
>                 compatible = "marvell,armada-ap806-sdhci";
>                 reg = <0xaa0000 0x1000>;
>                 interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
> -               clocks = <&emmc_clk>;
> -               clock-names = "core";
> +               clocks = <&emmc_clk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-phy-slow-mode;
>                 marvell,xenon-tun-count = <11>;
> @@ -126,8 +128,8 @@ Example:
>                 interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
>                 vqmmc-supply = <&sd_vqmmc_regulator>;
>                 vmmc-supply = <&sd_vmmc_regulator>;
> -               clocks = <&sdclk>;
> -               clock-names = "core";
> +               clocks = <&sdclk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-tun-count = <9>;
>         };
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>         struct sdhci_pltfm_host *pltfm_host;
>         struct sdhci_host *host;
> +       struct xenon_priv *priv;
>         int err;
>
>         host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>                 return PTR_ERR(host);
>
>         pltfm_host = sdhci_priv(host);
> +       priv = sdhci_pltfm_priv(pltfm_host);
>
>         /*
>          * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>         if (err)
>                 goto free_pltfm;
>
> +       priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +       if (IS_ERR(priv->axi_clk)) {
> +               err = PTR_ERR(priv->axi_clk);
> +               if (err == -EPROBE_DEFER)
> +                       goto err_clk;
> +               priv->axi_clk = NULL;
> +       } else {
> +               err = clk_prepare_enable(priv->axi_clk);
> +               if (err)
> +                       goto err_clk;
> +       }
> +
>         err = mmc_of_parse(host->mmc);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         sdhci_get_of_property(pdev);
>
> @@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
>         /* Xenon specific dt parse */
>         err = xenon_probe_dt(pdev);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         err = xenon_sdhc_prepare(host);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         pm_runtime_get_noresume(&pdev->dev);
>         pm_runtime_set_active(&pdev->dev);
> @@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_put_noidle(&pdev->dev);
>         xenon_sdhc_unprepare(host);
> +err_clk_axi:
> +       clk_disable_unprepare(priv->axi_clk);
>  err_clk:
>         clk_disable_unprepare(pltfm_host->clk);
>  free_pltfm:
> @@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
>  {
>         struct sdhci_host *host = platform_get_drvdata(pdev);
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +       struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
>
>         pm_runtime_get_sync(&pdev->dev);
>         pm_runtime_disable(&pdev->dev);
> @@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
>         sdhci_remove_host(host, 0);
>
>         xenon_sdhc_unprepare(host);
> -
> +       clk_disable_unprepare(priv->axi_clk);
>         clk_disable_unprepare(pltfm_host->clk);
>
>         sdhci_pltfm_free(pdev);
> diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> index 2bc0510c0769..9994995c7c56 100644
> --- a/drivers/mmc/host/sdhci-xenon.h
> +++ b/drivers/mmc/host/sdhci-xenon.h
> @@ -83,6 +83,7 @@ struct xenon_priv {
>         unsigned char   bus_width;
>         unsigned char   timing;
>         unsigned int    clock;
> +       struct clk      *axi_clk;
>
>         int             phy_type;
>         /*
> --
> 2.14.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[zhoujie wu]

Hi Gregory,
I tested this v2 patch on my armada3700 board.

Tested-by: Zhoujie Wu <zjwu@marvell.com>

On Fri, Sep 29, 2017 at 6:04 AM, Gregory CLEMENT
<gregory.clement@free-electrons.com> wrote:
> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
>
> The binding documentation is updating accordingly.
>
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
>
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable@vger.kernel.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> ---
> Hi Ulf and Adrian,
>
> This patch should be merged in 4.14-rc, as it fixes real issues.
>
> This patch maye looks like just as a nice clean-up but it is not. On
> the earlier version of the series adding the support for the xenon
> controller there was already this axi bus clock. But at this moment
> the documentation for the clock on the Armada 7K/8K was missing and
> there was no driver for it, so we just use the clock set by the
> bootloader and never change them that's why it worked without any
> visible problem.
>
> Then as explained in the commit log the network driver enabled the
> clock for us, and it happened that it was setup before the xenon
> driver. It is only thanks the new information we received on the
> clocks of the Sov and with more exhaustive testes that we found this
> issue and the fix for it.
>
> Thanks,
>
> Gregory
>
> Changelog:
> v1->v2:
>  - manage the -EPROBE_DEFER case
>  - remove warning message when axi clock is not present
>  - remove useless test before clk_disable_unprepare()
>
>  .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
>  drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
>  drivers/mmc/host/sdhci-xenon.h                     |  1 +
>  3 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> index b878a1e305af..ed1456f5c94d 100644
> --- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> @@ -16,11 +16,13 @@ Required Properties:
>
>  - clocks:
>    Array of clocks required for SDHC.
> -  Require at least input clock for Xenon IP core.
> +  Require at least input clock for Xenon IP core. For Armada AP806 and
> +  CP110, the AXI clock is also mandatory.
>
>  - clock-names:
>    Array of names corresponding to clocks property.
>    The input clock for Xenon IP core should be named as "core".
> +  The input clock for the AXI bus must be named as "axi".
>
>  - reg:
>    * For "marvell,armada-3700-sdhci", two register areas.
> @@ -106,8 +108,8 @@ Example:
>                 compatible = "marvell,armada-ap806-sdhci";
>                 reg = <0xaa0000 0x1000>;
>                 interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
> -               clocks = <&emmc_clk>;
> -               clock-names = "core";
> +               clocks = <&emmc_clk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-phy-slow-mode;
>                 marvell,xenon-tun-count = <11>;
> @@ -126,8 +128,8 @@ Example:
>                 interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
>                 vqmmc-supply = <&sd_vqmmc_regulator>;
>                 vmmc-supply = <&sd_vmmc_regulator>;
> -               clocks = <&sdclk>;
> -               clock-names = "core";
> +               clocks = <&sdclk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-tun-count = <9>;
>         };
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>         struct sdhci_pltfm_host *pltfm_host;
>         struct sdhci_host *host;
> +       struct xenon_priv *priv;
>         int err;
>
>         host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>                 return PTR_ERR(host);
>
>         pltfm_host = sdhci_priv(host);
> +       priv = sdhci_pltfm_priv(pltfm_host);
>
>         /*
>          * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>         if (err)
>                 goto free_pltfm;
>
> +       priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +       if (IS_ERR(priv->axi_clk)) {
> +               err = PTR_ERR(priv->axi_clk);
> +               if (err == -EPROBE_DEFER)
> +                       goto err_clk;
> +               priv->axi_clk = NULL;
> +       } else {
> +               err = clk_prepare_enable(priv->axi_clk);
> +               if (err)
> +                       goto err_clk;
> +       }
> +
>         err = mmc_of_parse(host->mmc);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         sdhci_get_of_property(pdev);
>
> @@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
>         /* Xenon specific dt parse */
>         err = xenon_probe_dt(pdev);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         err = xenon_sdhc_prepare(host);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         pm_runtime_get_noresume(&pdev->dev);
>         pm_runtime_set_active(&pdev->dev);
> @@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_put_noidle(&pdev->dev);
>         xenon_sdhc_unprepare(host);
> +err_clk_axi:
> +       clk_disable_unprepare(priv->axi_clk);
>  err_clk:
>         clk_disable_unprepare(pltfm_host->clk);
>  free_pltfm:
> @@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
>  {
>         struct sdhci_host *host = platform_get_drvdata(pdev);
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +       struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
>
>         pm_runtime_get_sync(&pdev->dev);
>         pm_runtime_disable(&pdev->dev);
> @@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
>         sdhci_remove_host(host, 0);
>
>         xenon_sdhc_unprepare(host);
> -
> +       clk_disable_unprepare(priv->axi_clk);
>         clk_disable_unprepare(pltfm_host->clk);
>
>         sdhci_pltfm_free(pdev);
> diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> index 2bc0510c0769..9994995c7c56 100644
> --- a/drivers/mmc/host/sdhci-xenon.h
> +++ b/drivers/mmc/host/sdhci-xenon.h
> @@ -83,6 +83,7 @@ struct xenon_priv {
>         unsigned char   bus_width;
>         unsigned char   timing;
>         unsigned int    clock;
> +       struct clk      *axi_clk;
>
>         int             phy_type;
>         /*
> --
> 2.14.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[zhoujie wu]

Hi Gregory,
I tested this v2 patch on my armada3700 board.

Tested-by: Zhoujie Wu <zjwu@marvell.com>

On Fri, Sep 29, 2017 at 6:04 AM, Gregory CLEMENT
<gregory.clement@free-electrons.com> wrote:
> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
>
> The binding documentation is updating accordingly.
>
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
>
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable@vger.kernel.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> ---
> Hi Ulf and Adrian,
>
> This patch should be merged in 4.14-rc, as it fixes real issues.
>
> This patch maye looks like just as a nice clean-up but it is not. On
> the earlier version of the series adding the support for the xenon
> controller there was already this axi bus clock. But at this moment
> the documentation for the clock on the Armada 7K/8K was missing and
> there was no driver for it, so we just use the clock set by the
> bootloader and never change them that's why it worked without any
> visible problem.
>
> Then as explained in the commit log the network driver enabled the
> clock for us, and it happened that it was setup before the xenon
> driver. It is only thanks the new information we received on the
> clocks of the Sov and with more exhaustive testes that we found this
> issue and the fix for it.
>
> Thanks,
>
> Gregory
>
> Changelog:
> v1->v2:
>  - manage the -EPROBE_DEFER case
>  - remove warning message when axi clock is not present
>  - remove useless test before clk_disable_unprepare()
>
>  .../bindings/mmc/marvell,xenon-sdhci.txt           | 12 ++++++-----
>  drivers/mmc/host/sdhci-xenon.c                     | 25 ++++++++++++++++++----
>  drivers/mmc/host/sdhci-xenon.h                     |  1 +
>  3 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> index b878a1e305af..ed1456f5c94d 100644
> --- a/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/marvell,xenon-sdhci.txt
> @@ -16,11 +16,13 @@ Required Properties:
>
>  - clocks:
>    Array of clocks required for SDHC.
> -  Require at least input clock for Xenon IP core.
> +  Require at least input clock for Xenon IP core. For Armada AP806 and
> +  CP110, the AXI clock is also mandatory.
>
>  - clock-names:
>    Array of names corresponding to clocks property.
>    The input clock for Xenon IP core should be named as "core".
> +  The input clock for the AXI bus must be named as "axi".
>
>  - reg:
>    * For "marvell,armada-3700-sdhci", two register areas.
> @@ -106,8 +108,8 @@ Example:
>                 compatible = "marvell,armada-ap806-sdhci";
>                 reg = <0xaa0000 0x1000>;
>                 interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>
> -               clocks = <&emmc_clk>;
> -               clock-names = "core";
> +               clocks = <&emmc_clk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-phy-slow-mode;
>                 marvell,xenon-tun-count = <11>;
> @@ -126,8 +128,8 @@ Example:
>                 interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>
>                 vqmmc-supply = <&sd_vqmmc_regulator>;
>                 vmmc-supply = <&sd_vmmc_regulator>;
> -               clocks = <&sdclk>;
> -               clock-names = "core";
> +               clocks = <&sdclk>, <&axi_clk>;
> +               clock-names = "core", "axi";
>                 bus-width = <4>;
>                 marvell,xenon-tun-count = <9>;
>         };
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>         struct sdhci_pltfm_host *pltfm_host;
>         struct sdhci_host *host;
> +       struct xenon_priv *priv;
>         int err;
>
>         host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>                 return PTR_ERR(host);
>
>         pltfm_host = sdhci_priv(host);
> +       priv = sdhci_pltfm_priv(pltfm_host);
>
>         /*
>          * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>         if (err)
>                 goto free_pltfm;
>
> +       priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +       if (IS_ERR(priv->axi_clk)) {
> +               err = PTR_ERR(priv->axi_clk);
> +               if (err == -EPROBE_DEFER)
> +                       goto err_clk;
> +               priv->axi_clk = NULL;
> +       } else {
> +               err = clk_prepare_enable(priv->axi_clk);
> +               if (err)
> +                       goto err_clk;
> +       }
> +
>         err = mmc_of_parse(host->mmc);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         sdhci_get_of_property(pdev);
>
> @@ -502,11 +516,11 @@ static int xenon_probe(struct platform_device *pdev)
>         /* Xenon specific dt parse */
>         err = xenon_probe_dt(pdev);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         err = xenon_sdhc_prepare(host);
>         if (err)
> -               goto err_clk;
> +               goto err_clk_axi;
>
>         pm_runtime_get_noresume(&pdev->dev);
>         pm_runtime_set_active(&pdev->dev);
> @@ -527,6 +541,8 @@ static int xenon_probe(struct platform_device *pdev)
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_put_noidle(&pdev->dev);
>         xenon_sdhc_unprepare(host);
> +err_clk_axi:
> +       clk_disable_unprepare(priv->axi_clk);
>  err_clk:
>         clk_disable_unprepare(pltfm_host->clk);
>  free_pltfm:
> @@ -538,6 +554,7 @@ static int xenon_remove(struct platform_device *pdev)
>  {
>         struct sdhci_host *host = platform_get_drvdata(pdev);
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +       struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
>
>         pm_runtime_get_sync(&pdev->dev);
>         pm_runtime_disable(&pdev->dev);
> @@ -546,7 +563,7 @@ static int xenon_remove(struct platform_device *pdev)
>         sdhci_remove_host(host, 0);
>
>         xenon_sdhc_unprepare(host);
> -
> +       clk_disable_unprepare(priv->axi_clk);
>         clk_disable_unprepare(pltfm_host->clk);
>
>         sdhci_pltfm_free(pdev);
> diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> index 2bc0510c0769..9994995c7c56 100644
> --- a/drivers/mmc/host/sdhci-xenon.h
> +++ b/drivers/mmc/host/sdhci-xenon.h
> @@ -83,6 +83,7 @@ struct xenon_priv {
>         unsigned char   bus_width;
>         unsigned char   timing;
>         unsigned int    clock;
> +       struct clk      *axi_clk;
>
>         int             phy_type;
>         /*
> --
> 2.14.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Zhoujie,

On Fri, 29 Sep 2017 11:42:14 -0700 zhoujie wu <zhoujiewu@gmail.com> wrote:

> Hi Gregory,
> I tested this v2 patch on my armada3700 board.
> 
> Tested-by: Zhoujie Wu <zjwu@marvell.com>

Soft remind: The linux kernel community doesn't like top post.

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Zhoujie,

On Fri, 29 Sep 2017 11:42:14 -0700 zhoujie wu <zhoujiewu@gmail.com> wrote:

> Hi Gregory,
> I tested this v2 patch on my armada3700 board.
> 
> Tested-by: Zhoujie Wu <zjwu@marvell.com>

Soft remind: The linux kernel community doesn't like top post.

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Zhoujie,

On Fri, 29 Sep 2017 11:42:14 -0700 zhoujie wu <zhoujiewu@gmail.com> wrote:

> Hi Gregory,
> I tested this v2 patch on my armada3700 board.
> 
> Tested-by: Zhoujie Wu <zjwu@marvell.com>

Soft remind: The linux kernel community doesn't like top post.

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Gregory,

On Fri, 29 Sep 2017 15:04:35 +0200 Gregory CLEMENT wrote:

> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
> 
> The binding documentation is updating accordingly.
> 
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
> 
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable@vger.kernel.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

<snip>

> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct sdhci_host *host;
> +	struct xenon_priv *priv;
>  	int err;
>  
>  	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>  		return PTR_ERR(host);
>  
>  	pltfm_host = sdhci_priv(host);
> +	priv = sdhci_pltfm_priv(pltfm_host);
>  
>  	/*
>  	 * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>  	if (err)
>  		goto free_pltfm;
>  
> +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +	if (IS_ERR(priv->axi_clk)) {
> +		err = PTR_ERR(priv->axi_clk);
> +		if (err == -EPROBE_DEFER)
> +			goto err_clk;
> +		priv->axi_clk = NULL;

IMHO, this assignment could be removed. What do you think?

Thanks

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Gregory,

On Fri, 29 Sep 2017 15:04:35 +0200 Gregory CLEMENT wrote:

> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
> 
> The binding documentation is updating accordingly.
> 
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
> 
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable@vger.kernel.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

<snip>

> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct sdhci_host *host;
> +	struct xenon_priv *priv;
>  	int err;
>  
>  	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>  		return PTR_ERR(host);
>  
>  	pltfm_host = sdhci_priv(host);
> +	priv = sdhci_pltfm_priv(pltfm_host);
>  
>  	/*
>  	 * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>  	if (err)
>  		goto free_pltfm;
>  
> +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +	if (IS_ERR(priv->axi_clk)) {
> +		err = PTR_ERR(priv->axi_clk);
> +		if (err == -EPROBE_DEFER)
> +			goto err_clk;
> +		priv->axi_clk = NULL;

IMHO, this assignment could be removed. What do you think?

Thanks

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Gregory,

On Fri, 29 Sep 2017 15:04:35 +0200 Gregory CLEMENT wrote:

> On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
> is optional because not all the SoCs need them but at least for Armada
> 7K/8K it is actually mandatory.
> 
> The binding documentation is updating accordingly.
> 
> Without this patch the kernel hand during boot if the mvpp2.2 network
> driver was not present in the kernel. Indeed the clock needed by the
> xenon controller was set by the network driver.
> 
> Fixes: 3a3748dba881 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
> functionality)"
> CC: Stable <stable@vger.kernel.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

<snip>

> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 2eec2e652c53..15f912d08a4c 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -466,6 +466,7 @@ static int xenon_probe(struct platform_device *pdev)
>  {
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct sdhci_host *host;
> +	struct xenon_priv *priv;
>  	int err;
>  
>  	host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
> @@ -474,6 +475,7 @@ static int xenon_probe(struct platform_device *pdev)
>  		return PTR_ERR(host);
>  
>  	pltfm_host = sdhci_priv(host);
> +	priv = sdhci_pltfm_priv(pltfm_host);
>  
>  	/*
>  	 * Link Xenon specific mmc_host_ops function,
> @@ -491,9 +493,21 @@ static int xenon_probe(struct platform_device *pdev)
>  	if (err)
>  		goto free_pltfm;
>  
> +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> +	if (IS_ERR(priv->axi_clk)) {
> +		err = PTR_ERR(priv->axi_clk);
> +		if (err == -EPROBE_DEFER)
> +			goto err_clk;
> +		priv->axi_clk = NULL;

IMHO, this assignment could be removed. What do you think?

Thanks

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Thomas Petazzoni]

Hello,

On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:

> > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > +	if (IS_ERR(priv->axi_clk)) {
> > +		err = PTR_ERR(priv->axi_clk);
> > +		if (err == -EPROBE_DEFER)
> > +			goto err_clk;
> > +		priv->axi_clk = NULL;  
> 
> IMHO, this assignment could be removed. What do you think?

No, because if the clock is not present in the Device Tree,
priv->axi_clk will contain an error code encoded as a pointer, so
priv->axi_clk will not be NULL. Hence the rest of the code that will
operate on this clock will believe there is a valid clock pointed by
priv->axi_clk. So we really want to reset it to NULL when there was an
error getting the clock.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Thomas Petazzoni]

Hello,

On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:

> > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > +	if (IS_ERR(priv->axi_clk)) {
> > +		err = PTR_ERR(priv->axi_clk);
> > +		if (err == -EPROBE_DEFER)
> > +			goto err_clk;
> > +		priv->axi_clk = NULL;  
> 
> IMHO, this assignment could be removed. What do you think?

No, because if the clock is not present in the Device Tree,
priv->axi_clk will contain an error code encoded as a pointer, so
priv->axi_clk will not be NULL. Hence the rest of the code that will
operate on this clock will believe there is a valid clock pointed by
priv->axi_clk. So we really want to reset it to NULL when there was an
error getting the clock.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Thomas Petazzoni]

Hello,

On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:

> > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > +	if (IS_ERR(priv->axi_clk)) {
> > +		err = PTR_ERR(priv->axi_clk);
> > +		if (err == -EPROBE_DEFER)
> > +			goto err_clk;
> > +		priv->axi_clk = NULL;  
> 
> IMHO, this assignment could be removed. What do you think?

No, because if the clock is not present in the Device Tree,
priv->axi_clk will contain an error code encoded as a pointer, so
priv->axi_clk will not be NULL. Hence the rest of the code that will
operate on this clock will believe there is a valid clock pointed by
priv->axi_clk. So we really want to reset it to NULL when there was an
error getting the clock.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Thomas,

On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:

> Hello,
> 
> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
> 
> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > > +	if (IS_ERR(priv->axi_clk)) {
> > > +		err = PTR_ERR(priv->axi_clk);
> > > +		if (err == -EPROBE_DEFER)
> > > +			goto err_clk;
> > > +		priv->axi_clk = NULL;    
> > 
> > IMHO, this assignment could be removed. What do you think?  
> 
> No, because if the clock is not present in the Device Tree,
> priv->axi_clk will contain an error code encoded as a pointer, so
> priv->axi_clk will not be NULL. Hence the rest of the code that will

FWICT, the clk_disable_unprepare() could also check whether the clk
is err, am I wrong?

> operate on this clock will believe there is a valid clock pointed by
> priv->axi_clk. So we really want to reset it to NULL when there was an
> error getting the clock.
> 
> Best regards,
> 
> Thomas

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Thomas,

On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:

> Hello,
> 
> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
> 
> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > > +	if (IS_ERR(priv->axi_clk)) {
> > > +		err = PTR_ERR(priv->axi_clk);
> > > +		if (err == -EPROBE_DEFER)
> > > +			goto err_clk;
> > > +		priv->axi_clk = NULL;    
> > 
> > IMHO, this assignment could be removed. What do you think?  
> 
> No, because if the clock is not present in the Device Tree,
> priv->axi_clk will contain an error code encoded as a pointer, so
> priv->axi_clk will not be NULL. Hence the rest of the code that will

FWICT, the clk_disable_unprepare() could also check whether the clk
is err, am I wrong?

> operate on this clock will believe there is a valid clock pointed by
> priv->axi_clk. So we really want to reset it to NULL when there was an
> error getting the clock.
> 
> Best regards,
> 
> Thomas

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Jisheng Zhang]

Hi Thomas,

On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:

> Hello,
> 
> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
> 
> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > > +	if (IS_ERR(priv->axi_clk)) {
> > > +		err = PTR_ERR(priv->axi_clk);
> > > +		if (err == -EPROBE_DEFER)
> > > +			goto err_clk;
> > > +		priv->axi_clk = NULL;    
> > 
> > IMHO, this assignment could be removed. What do you think?  
> 
> No, because if the clock is not present in the Device Tree,
> priv->axi_clk will contain an error code encoded as a pointer, so
> priv->axi_clk will not be NULL. Hence the rest of the code that will

FWICT, the clk_disable_unprepare() could also check whether the clk
is err, am I wrong?

> operate on this clock will believe there is a valid clock pointed by
> priv->axi_clk. So we really want to reset it to NULL when there was an
> error getting the clock.
> 
> Best regards,
> 
> Thomas

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

Hi Jisheng,
 
 On sam., sept. 30 2017, Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote:

> Hi Thomas,
>
> On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:
>
>> Hello,
>> 
>> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
>> 
>> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
>> > > +	if (IS_ERR(priv->axi_clk)) {
>> > > +		err = PTR_ERR(priv->axi_clk);
>> > > +		if (err == -EPROBE_DEFER)
>> > > +			goto err_clk;
>> > > +		priv->axi_clk = NULL;    
>> > 
>> > IMHO, this assignment could be removed. What do you think?  
>> 
>> No, because if the clock is not present in the Device Tree,
>> priv->axi_clk will contain an error code encoded as a pointer, so
>> priv->axi_clk will not be NULL. Hence the rest of the code that will
>
> FWICT, the clk_disable_unprepare() could also check whether the clk
> is err, am I wrong?

You're right, I've jsut checked it.
So I will remove it to have a smaller fix.

Thanks,

Gregory

>
>> operate on this clock will believe there is a valid clock pointed by
>> priv->axi_clk. So we really want to reset it to NULL when there was an
>> error getting the clock.
>> 
>> Best regards,
>> 
>> Thomas
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

Hi Jisheng,
 
 On sam., sept. 30 2017, Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote:

> Hi Thomas,
>
> On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:
>
>> Hello,
>> 
>> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
>> 
>> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
>> > > +	if (IS_ERR(priv->axi_clk)) {
>> > > +		err = PTR_ERR(priv->axi_clk);
>> > > +		if (err == -EPROBE_DEFER)
>> > > +			goto err_clk;
>> > > +		priv->axi_clk = NULL;    
>> > 
>> > IMHO, this assignment could be removed. What do you think?  
>> 
>> No, because if the clock is not present in the Device Tree,
>> priv->axi_clk will contain an error code encoded as a pointer, so
>> priv->axi_clk will not be NULL. Hence the rest of the code that will
>
> FWICT, the clk_disable_unprepare() could also check whether the clk
> is err, am I wrong?

You're right, I've jsut checked it.
So I will remove it to have a smaller fix.

Thanks,

Gregory

>
>> operate on this clock will believe there is a valid clock pointed by
>> priv->axi_clk. So we really want to reset it to NULL when there was an
>> error getting the clock.
>> 
>> Best regards,
>> 
>> Thomas
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

Re: [PATCH v2] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

Hi Jisheng,
 
 On sam., sept. 30 2017, Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote:

> Hi Thomas,
>
> On Sat, 30 Sep 2017 08:07:10 +0200 Thomas Petazzoni wrote:
>
>> Hello,
>> 
>> On Sat, 30 Sep 2017 10:41:09 +0800, Jisheng Zhang wrote:
>> 
>> > > +	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
>> > > +	if (IS_ERR(priv->axi_clk)) {
>> > > +		err = PTR_ERR(priv->axi_clk);
>> > > +		if (err == -EPROBE_DEFER)
>> > > +			goto err_clk;
>> > > +		priv->axi_clk = NULL;    
>> > 
>> > IMHO, this assignment could be removed. What do you think?  
>> 
>> No, because if the clock is not present in the Device Tree,
>> priv->axi_clk will contain an error code encoded as a pointer, so
>> priv->axi_clk will not be NULL. Hence the rest of the code that will
>
> FWICT, the clk_disable_unprepare() could also check whether the clk
> is err, am I wrong?

You're right, I've jsut checked it.
So I will remove it to have a smaller fix.

Thanks,

Gregory

>
>> operate on this clock will believe there is a valid clock pointed by
>> priv->axi_clk. So we really want to reset it to NULL when there was an
>> error getting the clock.
>> 
>> Best regards,
>> 
>> Thomas
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com