On Saturday, June 29, 2013 6:00 PM, Kishon Vijay Abraham I wrote:
>
> Hi,
>
> On Friday 28 June 2013 12:45 PM, Jingoo Han wrote:
> > Add a PHY provider driver for the Samsung Exynos SoC DP PHY.
> >
> > Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
> > ---
> > .../phy/samsung,exynos5250-dp-video-phy.txt | 7 ++
> > drivers/phy/Kconfig | 8 ++
> > drivers/phy/Makefile | 3 +-
> > drivers/phy/phy-exynos-dp-video.c | 122 ++++++++++++++++++++
> > 4 files changed, 139 insertions(+), 1 deletion(-)
> > create mode 100644 Documentation/devicetree/bindings/phy/samsung,exynos5250-dp-video-phy.txt
> > create mode 100644 drivers/phy/phy-exynos-dp-video.c
> >
> > diff --git a/Documentation/devicetree/bindings/phy/samsung,exynos5250-dp-video-phy.txt
> > b/Documentation/devicetree/bindings/phy/samsung,exynos5250-dp-video-phy.txt
> > new file mode 100644
> > index 0000000..d1771ef
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/samsung,exynos5250-dp-video-phy.txt
> > @@ -0,0 +1,7 @@
> > +Samsung EXYNOS SoC series DP PHY
> > +-------------------------------------------------
> > +
> > +Required properties:
> > +- compatible : should be "samsung,exynos5250-dp-video-phy";
> > +- reg : offset and length of the DP PHY register set;
> > +- #phy-cells : from the generic phy bindings, must be 0;
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index 5f85909..6d10e3b 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -11,3 +11,11 @@ menuconfig GENERIC_PHY
> > devices present in the kernel. This layer will have the generic
> > API by which phy drivers can create PHY using the phy framework and
> > phy users can obtain reference to the PHY.
> > +
> > +if GENERIC_PHY
> > +
> > +config PHY_EXYNOS_DP_VIDEO
> > + tristate "EXYNOS SoC series DP PHY driver"
> > + help
> > + Support for DP PHY found on Samsung EXYNOS SoCs.
> > +endif
> > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> > index 9e9560f..d8d861c 100644
> > --- a/drivers/phy/Makefile
> > +++ b/drivers/phy/Makefile
> > @@ -2,4 +2,5 @@
> > # Makefile for the phy drivers.
> > #
> >
> > -obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> > +obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> > +obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
> > diff --git a/drivers/phy/phy-exynos-dp-video.c b/drivers/phy/phy-exynos-dp-video.c
> > new file mode 100644
> > index 0000000..9a3d6f1
> > --- /dev/null
> > +++ b/drivers/phy/phy-exynos-dp-video.c
> > @@ -0,0 +1,122 @@
> > +/*
> > + * Samsung EXYNOS SoC series DP PHY driver
> > + *
> > + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> > + * Author: Jingoo Han <jg1.han@xxxxxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include <linux/io.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/spinlock.h>
> > +
> > +/* DPTX_PHY_CONTROL register */
> > +#define EXYNOS_DPTX_PHY_ENABLE (1 << 0)
> > +
> > +struct exynos_dp_video_phy {
> > + spinlock_t slock;
>
> I think spinlock is not needed at all since the PHY ops is already protected
> by a mutex.
Yes, you're right.
Only one PHY object access the control register; thus,
there is no need to add spinlock.
I will remove it.
> > + struct phy *phys;
>
> _phys_ no longer need to part of this structure.
OK, I see.
'struct phy' is only used at exynos_dp_video_phy_probe().
So, I will remove 'struct phy *phys' from 'struct exynos_dp_video_phy'.
Thank you for your comment.
Best regards,
Jingoo Han
> > + void __iomem *regs;
> > +};
>
> Thanks
> Kishon
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