linux-kernel - RE: [PATCH 3/3] usb: dwc3-exynos: Make provision for vdd regulators

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Message-id: <00bf01cf5ed6$28de18d0$7a9a4a70$%tikhomirov@samsung.com>
Date:	Wed, 23 Apr 2014 18:26:51 +0900
From:	Anton Tikhomirov <av.tikhomirov@...sung.com>
To:	'Vivek Gautam' <gautam.vivek@...sung.com>,
	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Cc:	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
Subject: RE: [PATCH 3/3] usb: dwc3-exynos: Make provision for vdd regulators

Hello,

> -----Original Message-----
> From: Vivek Gautam [mailto:gautamvivek1987@...il.com] On Behalf Of
> Vivek Gautam
> Sent: Monday, April 21, 2014 9:17 PM
> To: linux-usb@...r.kernel.org; linux-samsung-soc@...r.kernel.org
> Cc: 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; Vivek
> Gautam; Anton Tikhomirov
> Subject: [PATCH 3/3] usb: dwc3-exynos: Make provision for vdd
> regulators
> 
> Facilitate getting required 3.3V and 1.0V VDD supply for
> DWC3 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: Anton Tikhomirov <av.tikhomirov@...sung.com>
> ---
> 
> Based on 'usb-next' branch of Greg's USB tree.
> Also cleanly applies on 'next' branch of Balbi's USB tree.
> 
>  drivers/usb/dwc3/dwc3-exynos.c |   51
> ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 49 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-
> exynos.c
> index 28c8ad7..c9d9102 100644
> --- a/drivers/usb/dwc3/dwc3-exynos.c
> +++ b/drivers/usb/dwc3/dwc3-exynos.c
> @@ -27,6 +27,7 @@
>  #include <linux/usb/usb_phy_gen_xceiv.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> +#include <linux/regulator/consumer.h>
> 
>  struct dwc3_exynos {
>  	struct platform_device	*usb2_phy;
> @@ -34,6 +35,8 @@ struct dwc3_exynos {
>  	struct device		*dev;
> 
>  	struct clk		*clk;
> +	struct regulator	*vdd33;
> +	struct regulator	*vdd10;
>  };
> 
>  static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
> @@ -144,20 +147,46 @@ static int dwc3_exynos_probe(struct
> platform_device *pdev)
> 
>  	clk_prepare_enable(exynos->clk);
> 
> +	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
> +	if (IS_ERR(exynos->vdd33)) {
> +		ret = PTR_ERR(exynos->vdd33);
> +		goto err2;

Is regulator property mandatory for dwc3-exynos? If it is not
and device tree doesn't provide it, dwc3-exynos driver probe shouldn't
fail here.

> +	}
> +	ret = regulator_enable(exynos->vdd33);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable VDD33 supply\n");
> +		goto err2;
> +	}
> +

Thanks

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