[PATCH v7 2/5] phy: add a driver for the Rockchip SoC internal USB2.0 PHY

[Kishon Vijay Abraham I]

Hi,

On Friday 12 December 2014 08:37 PM, Yunzhi Li wrote:
> This patch to add a generic PHY driver for ROCKCHIP usb PHYs,
> currently this driver can support RK3288. The RK3288 SoC have
> three independent USB PHY IPs which are all configured through a
> set of registers located in the GRF (general register files)
> module.
> 
> Signed-off-by: Yunzhi Li <lyz at rock-chips.com>
> 
> ---
> 
> Changes in v7:
> - Accept Kishon's comments to use phandle args to find a phy
>   struct directly and get rid of using a custom of_xlate
>   function.
> 
> Changes in v6:
> - Rename SIDDQ_MSK to SIDDQ_WRITE_ENA.
> 
> Changes in v5: None
> Changes in v4:
> - Get number of PHYs from device tree.
> - Model each PHY as subnode of the phy provider node.
> 
> Changes in v3:
> - Use BIT macro instead of bit shift ops.
> - Rename the config entry to PHY_ROCKCHIP_USB.
> 
>  drivers/phy/Kconfig            |   7 ++
>  drivers/phy/Makefile           |   1 +
>  drivers/phy/phy-rockchip-usb.c | 158 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 166 insertions(+)
>  create mode 100644 drivers/phy/phy-rockchip-usb.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index ccad880..b24500a 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -239,6 +239,13 @@ config PHY_QCOM_IPQ806X_SATA
>  	depends on OF
>  	select GENERIC_PHY
>  
> +config PHY_ROCKCHIP_USB
> +	tristate "Rockchip USB2 PHY Driver"
> +	depends on ARCH_ROCKCHIP && OF
> +	select GENERIC_PHY
> +	help
> +	  Enable this to support the Rockchip USB 2.0 PHY.
> +
>  config PHY_ST_SPEAR1310_MIPHY
>  	tristate "ST SPEAR1310-MIPHY driver"
>  	select GENERIC_PHY
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index aa74f96..48bf5a1 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -28,6 +28,7 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2)	+= phy-exynos5250-usb2.o
>  phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>  obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
> +obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
>  obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
>  obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY)	+= phy-spear1310-miphy.o
>  obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY)	+= phy-spear1340-miphy.o
> diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
> new file mode 100644
> index 0000000..22011c3
> --- /dev/null
> +++ b/drivers/phy/phy-rockchip-usb.c
> @@ -0,0 +1,158 @@
> +/*
> + * Rockchip usb PHY driver
> + *
> + * Copyright (C) 2014 Yunzhi Li <lyz at rock-chips.com>
> + * Copyright (C) 2014 ROCKCHIP, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/reset.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +/*
> + * The higher 16-bit of this register is used for write protection
> + * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
> + */
> +#define SIDDQ_WRITE_ENA	BIT(29)
> +#define SIDDQ_ON		BIT(13)
> +#define SIDDQ_OFF		(0 << 13)
> +
> +struct rockchip_usb_phy {
> +	unsigned int	reg_offset;
> +	struct regmap	*reg_base;
> +	struct clk	*clk;
> +	struct phy	*phy;
> +};
> +
> +static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
> +					   bool siddq)
> +{
> +	return regmap_write(phy->reg_base, phy->reg_offset,
> +			    SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
> +}
> +
> +static int rockchip_usb_phy_power_off(struct phy *_phy)
> +{
> +	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
> +	int ret = 0;
> +
> +	/* Power down usb phy analog blocks by set siddq 1 */
> +	ret = rockchip_usb_phy_power(phy, 1);
> +	if (ret)
> +		return ret;
> +
> +	clk_disable_unprepare(phy->clk);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int rockchip_usb_phy_power_on(struct phy *_phy)
> +{
> +	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
> +	int ret = 0;
> +
> +	ret = clk_prepare_enable(phy->clk);
> +	if (ret)
> +		return ret;
> +
> +	/* Power up usb phy analog blocks by set siddq 0 */
> +	ret = rockchip_usb_phy_power(phy, 0);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static struct phy_ops ops = {
> +	.power_on	= rockchip_usb_phy_power_on,
> +	.power_off	= rockchip_usb_phy_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static int rockchip_usb_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rockchip_usb_phy *rk_phy;
> +	struct phy_provider *phy_provider;
> +	struct device_node *child;
> +	struct regmap *grf;
> +	unsigned int reg_offset;
> +
> +	grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
> +	if (IS_ERR(grf)) {
> +		dev_err(&pdev->dev, "Missing rockchip,grf property\n");
> +		return PTR_ERR(grf);
> +	}
> +
> +	for_each_available_child_of_node(dev->of_node, child) {
> +		rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
> +		if (!rk_phy)
> +			return -ENOMEM;
> +
> +		if (of_property_read_u32(child, "reg", &reg_offset)) {
> +			dev_err(dev, "missing reg property in node %s\n",
> +				child->name);
> +			return -EINVAL;
> +		}
> +
> +		rk_phy->reg_offset = reg_offset;
> +		rk_phy->reg_base = grf;
> +
> +		rk_phy->clk = of_clk_get_by_name(child, "phyclk");
> +		if (IS_ERR(rk_phy->clk))
> +			rk_phy->clk = NULL;
> +
> +		rk_phy->phy = devm_phy_create(dev, child, &ops);
> +		if (IS_ERR(rk_phy->phy)) {
> +			dev_err(dev, "failed to create PHY\n");
> +			return PTR_ERR(rk_phy->phy);
> +		}
> +		phy_set_drvdata(rk_phy->phy, rk_phy);
> +	}
> +
> +	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
> +	{ .compatible = "rockchip,rk3288-usb-phy" },

have you added devicetree binding documentation where I can find this
compatible string?

Thanks
Kishon