On Friday, June 28, 2013 2:31 PM, Kishon Vijay Abraham I wrote: > > Hi, > > On Friday 28 June 2013 10:52 AM, Jingoo Han wrote: > > Add a PHY provider driver for the Samsung Exynos SoC DP PHY. > > > > Signed-off-by: Jingoo Han <jg1....@samsung.com> > > --- > > .../phy/samsung,exynos5250-dp-video-phy.txt | 7 ++ > > drivers/phy/Kconfig | 8 ++ > > drivers/phy/Makefile | 3 +- > > drivers/phy/phy-exynos-dp-video.c | 130 > > ++++++++++++++++++++ > > 4 files changed, 147 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..8b6fa79 > > --- /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 1; > > 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..376b3bc2 > > --- /dev/null > > +++ b/drivers/phy/phy-exynos-dp-video.c > > @@ -0,0 +1,130 @@ > > +/* > > + * Samsung EXYNOS SoC series DP PHY driver > > + * > > + * Copyright (C) 2013 Samsung Electronics Co., Ltd. > > + * Author: Jingoo Han <jg1....@samsung.com> > > + * > > + * 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/delay.h> > > this header file is not needed here.
OK, I will remove it. > > > +#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; > > + struct phy *phys; > > + void __iomem *regs; > > +}; > > + > > +static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int > > on) > > +{ > > + void __iomem *addr; > > + unsigned long flags; > > + u32 reg; > > + > > + addr = state->regs; > > + > > + spin_lock_irqsave(&state->slock, flags); > > + reg = readl(addr); > > + if (on) > > + reg |= EXYNOS_DPTX_PHY_ENABLE; > > + else > > + reg &= ~EXYNOS_DPTX_PHY_ENABLE; > > + writel(reg, addr); > > + spin_unlock_irqrestore(&state->slock, flags); > > + return 0; > > +} > > + > > +static int exynos_dp_video_phy_power_on(struct phy *phy) > > +{ > > + struct exynos_dp_video_phy *state = phy_get_drvdata(phy); > > + > > + return __set_phy_state(state, 1); > > +} > > + > > +static int exynos_dp_video_phy_power_off(struct phy *phy) > > +{ > > + struct exynos_dp_video_phy *state = phy_get_drvdata(phy); > > + > > + return __set_phy_state(state, 0); > > +} > > + > > +static struct phy *exynos_dp_video_phy_xlate(struct device *dev, > > + struct of_phandle_args *args) > > +{ > > + struct exynos_dp_video_phy *state = dev_get_drvdata(dev); > > + > > + return state->phys; > > you can instead use of_phy_simple_xlate for such simple cases. OK, I will use of_phy_simple_xlate(). > > +} > > + > > +static struct phy_ops exynos_dp_video_phy_ops = { > > + .power_on = exynos_dp_video_phy_power_on, > > + .power_off = exynos_dp_video_phy_power_off, > > + .owner = THIS_MODULE, > > +}; > > + > > +static int exynos_dp_video_phy_probe(struct platform_device *pdev) > > +{ > > + struct exynos_dp_video_phy *state; > > + struct device *dev = &pdev->dev; > > + struct resource *res; > > + struct phy_provider *phy_provider; > > + > > + state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); > > + if (!state) > > + return -ENOMEM; > > + > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + > > + state->regs = devm_ioremap_resource(dev, res); > > + if (IS_ERR(state->regs)) > > + return PTR_ERR(state->regs); > > + > > + dev_set_drvdata(dev, state); > > + > > + phy_provider = devm_of_phy_provider_register(dev, > > + exynos_dp_video_phy_xlate); > > + if (IS_ERR(phy_provider)) > > + return PTR_ERR(phy_provider); > > + > > + state->phys = devm_phy_create(dev, 0, &exynos_dp_video_phy_ops, "dp"); > > + if (IS_ERR(state->phys)) { > > + dev_err(dev, "failed to create DP PHY\n"); > > + return PTR_ERR(state->phys); > > + } > > + phy_set_drvdata(state->phys, state); > > + > > + return 0; > > +} > > + > > +static const struct of_device_id exynos_dp_video_phy_of_match[] = { > > + { .compatible = "samsung,exynos5250-dp-video-phy" }, > > + { }, > > +}; > > +MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); > > This above should come inside #ifdef CONFIG_OF. OK, I will add '#ifdef CONFIG_OF'. > > + > > +static struct platform_driver exynos_dp_video_phy_driver = { > > + .probe = exynos_dp_video_phy_probe, > > missing .remove? No, it is intentional. In the exynos_dp_video_phy_probe(), only devm_*() are called as below. devm_kzalloc(), devm_ioremap_resource(), devm_of_phy_provider_register(), devm_phy_create(), Also, dev_set_drvdata(dev, NULL), phy_set_drvdata(state->phys, NULL) are not necessary in remove(), because driver core clears automatically after device_release. Thus, there is no functions in the remove(). Thank you for your comment. :) It is very helpful. Best regards, Jingoo Han > > + .driver = { > > + .of_match_table = exynos_dp_video_phy_of_match, > > + .name = "exynos-dp-video-phy", > > + .owner = THIS_MODULE, > > + } > > +}; > > +module_platform_driver(exynos_dp_video_phy_driver); > > + > > +MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); > > +MODULE_AUTHOR("Jingoo Han <jg1....@samsung.com>"); > > +MODULE_LICENSE("GPL v2"); > > Thanks > Kishon _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss