[PATCH v3] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[PATCH v3] 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>
Tested-by: Zhoujie Wu <zjwu@marvell.com>
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 may 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 SoC and with more exhaustive testes that we found this
issue and the fix for it.

Thanks,

Gregory

Changelog:
v2->v3:
 - remove useless test on clk pointer
 - added tested-by from  Zhoujie Wu

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                     | 24 ++++++++++++++++++----
 drivers/mmc/host/sdhci-xenon.h                     |  1 +
 3 files changed, 28 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..0842bbc2d7ad 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 +493,20 @@ 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;
+	} 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 +515,11 @@ 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 +540,8 @@ 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 +553,7 @@ 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 +562,7 @@ 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 v3] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Ulf Hansson]

On 2 October 2017 at 16:58, 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>
> Tested-by: Zhoujie Wu <zjwu@marvell.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

Thanks, applied for fixes!

Next time, please split DT changes into separate patches - as that
simplifies the review process.

Kind regards
Uffe

> ---
> Hi Ulf and Adrian,
>
> This patch should be merged in 4.14-rc, as it fixes real issues.
>
> This patch may 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 SoC and with more exhaustive testes that we found this
> issue and the fix for it.
>
> Thanks,
>
> Gregory
>
> Changelog:
> v2->v3:
>  - remove useless test on clk pointer
>  - added tested-by from  Zhoujie Wu
>
> 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                     | 24 ++++++++++++++++++----
>  drivers/mmc/host/sdhci-xenon.h                     |  1 +
>  3 files changed, 28 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..0842bbc2d7ad 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 +493,20 @@ 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;
> +       } 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 +515,11 @@ 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 +540,8 @@ 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 +553,7 @@ 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 +562,7 @@ 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 v3] mmc: sdhci-xenon: Fix clock resource by adding an optional bus clock

[Gregory CLEMENT]

Hi Ulf,
 
 On mer., oct. 04 2017, Ulf Hansson <ulf.hansson@linaro.org> wrote:

> On 2 October 2017 at 16:58, 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>
>> Tested-by: Zhoujie Wu <zjwu@marvell.com>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
>
> Thanks, applied for fixes!
>
> Next time, please split DT changes into separate patches - as that
> simplifies the review process.

OK I will do this,

Thanks,

Gregory

>
> Kind regards
> Uffe
>
>> ---
>> Hi Ulf and Adrian,
>>
>> This patch should be merged in 4.14-rc, as it fixes real issues.
>>
>> This patch may 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 SoC and with more exhaustive testes that we found this
>> issue and the fix for it.
>>
>> Thanks,
>>
>> Gregory
>>
>> Changelog:
>> v2->v3:
>>  - remove useless test on clk pointer
>>  - added tested-by from  Zhoujie Wu
>>
>> 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                     | 24 ++++++++++++++++++----
>>  drivers/mmc/host/sdhci-xenon.h                     |  1 +
>>  3 files changed, 28 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..0842bbc2d7ad 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 +493,20 @@ 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;
>> +       } 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 +515,11 @@ 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 +540,8 @@ 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 +553,7 @@ 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 +562,7 @@ 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
>>

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