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

From: [email-masked] (Kishon Vijay Abraham I)
Date: Wed, 21 Jan 2015 15:40:45 +0530

Hi,

On Wednesday 21 January 2015 03:36 PM, Yunzhi Li wrote:
> Hi Kishon :
>> 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 <[email-masked]>
>>>
>>> ---
>>>
>>> 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 <[email-masked]>
>>> + * 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
>>
>>
> You could find this documentation in this page :
> https://lkml.org/lkml/2014/12/12/439

Okay. I don't seem to have that patch in my mailbox. Is it already queued in
some ones tree?

Thanks
Kishon