linux-kernel - Re: [PATCH 2/3] usb: ehci-exynos: Make provision for vdd regulators

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Message-id: <000b01cf5ef1$c8d5ae50$5a810af0$%han@samsung.com>
Date:	Wed, 23 Apr 2014 21:44:36 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Vivek Gautam' <gautam.vivek@...sung.com>
Cc:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
	stern@...land.harvard.edu, balbi@...com, kgene.kim@...sung.com,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH 2/3] usb: ehci-exynos: Make provision for vdd regulators

On Monday, April 21, 2014 9:17 PM, Vivek Gautam wrote:
> 
> Facilitate getting required 3.3V and 1.0V VDD supply for
> EHCI controller on Exynos.
> 
> With patches for regulators' nodes merged in 3.15:
> c8c253f ARM: dts: Add regulator entries to smdk5420
> 275dcd2 ARM: dts: add max77686 pmic node for smdk5250,
> 
> certain perripherals will now need to ensure that,
> they request VDD regulators in their drivers, and enable
> them so as to make them working.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Cc: Jingoo Han <jg1.han@...sung.com>

Acked-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han

> ---
> 
> Based on 'usb-next' branch of Greg's usb tree.
> 
>  drivers/usb/host/ehci-exynos.c |   47 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index d1d8c47..a3ca8cc 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -20,6 +20,7 @@
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/usb/phy.h>
>  #include <linux/usb/samsung_usb_phy.h>
>  #include <linux/usb.h>
> @@ -46,6 +47,8 @@ struct exynos_ehci_hcd {
>  	struct clk *clk;
>  	struct usb_phy *phy;
>  	struct usb_otg *otg;
> +	struct regulator *vdd33;
> +	struct regulator *vdd10;
>  };
> 
>  #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
> @@ -112,6 +115,28 @@ static int exynos_ehci_probe(struct platform_device *pdev)
>  		exynos_ehci->otg = phy->otg;
>  	}
> 
> +	exynos_ehci->vdd33 = devm_regulator_get(&pdev->dev, "vdd33");
> +	if (IS_ERR(exynos_ehci->vdd33)) {
> +		err = PTR_ERR(exynos_ehci->vdd33);
> +		goto fail_regulator1;
> +	}
> +	err = regulator_enable(exynos_ehci->vdd33);
> +	if (err) {
> +		dev_err(&pdev->dev, "Failed to enable VDD33 supply\n");
> +		goto fail_regulator1;
> +	}
> +
> +	exynos_ehci->vdd10 = devm_regulator_get(&pdev->dev, "vdd10");
> +	if (IS_ERR(exynos_ehci->vdd10)) {
> +		err = PTR_ERR(exynos_ehci->vdd10);
> +		goto fail_regulator2;
> +	}
> +	err = regulator_enable(exynos_ehci->vdd10);
> +	if (err) {
> +		dev_err(&pdev->dev, "Failed to enable VDD10 supply\n");
> +		goto fail_regulator2;
> +	}
> +
>  skip_phy:
> 
>  	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
> @@ -178,6 +203,10 @@ fail_add_hcd:
>  fail_io:
>  	clk_disable_unprepare(exynos_ehci->clk);
>  fail_clk:
> +	regulator_disable(exynos_ehci->vdd10);
> +fail_regulator2:
> +	regulator_disable(exynos_ehci->vdd33);
> +fail_regulator1:
>  	usb_put_hcd(hcd);
>  	return err;
>  }
> @@ -197,6 +226,9 @@ static int exynos_ehci_remove(struct platform_device *pdev)
> 
>  	clk_disable_unprepare(exynos_ehci->clk);
> 
> +	regulator_disable(exynos_ehci->vdd10);
> +	regulator_disable(exynos_ehci->vdd33);
> +
>  	usb_put_hcd(hcd);
> 
>  	return 0;
> @@ -221,6 +253,9 @@ static int exynos_ehci_suspend(struct device *dev)
> 
>  	clk_disable_unprepare(exynos_ehci->clk);
> 
> +	regulator_disable(exynos_ehci->vdd10);
> +	regulator_disable(exynos_ehci->vdd33);
> +
>  	return rc;
>  }
> 
> @@ -228,6 +263,18 @@ static int exynos_ehci_resume(struct device *dev)
>  {
>  	struct usb_hcd *hcd = dev_get_drvdata(dev);
>  	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
> +	int ret;
> +
> +	ret = regulator_enable(exynos_ehci->vdd33);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable VDD33 supply\n");
> +		return ret;
> +	}
> +	ret = regulator_enable(exynos_ehci->vdd10);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable VDD10 supply\n");
> +		return ret;
> +	}
> 
>  	clk_prepare_enable(exynos_ehci->clk);
> 
> --
> 1.7.10.4

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