Re: [PATCH v4 10/16] phy: Add driver for rockchip Display Port PHY

[Yakir Yang <ykk@rock-chips.com>]

Hi Heiko,

在 09/02/2015 12:51 AM, Heiko Stuebner 写道:
> Am Dienstag, 1. September 2015, 14:04:15 schrieb Yakir Yang:
>> This phy driver would control the Rockchip DisplayPort module
>> phy clock and phy power, it is relate to analogix_dp-rockchip
>> dp driver. If you want DP works rightly on rockchip platform,
>> then you should select both of them.
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>> ---
>> Changes in v4:
>> - Take Kishon suggest, add commit message, and remove the redundant
>>    rockchip_dp_phy_init() function, move those code to probe() method.
>>    And remove driver .owner number.
>>
>> Changes in v3:
>> - Take Heiko suggest, add rockchip dp phy driver,
>>    collect the phy clocks and power control.
>>
>> Changes in v2: None
>>
>>   .../devicetree/bindings/phy/rockchip-dp-phy.txt    |  26 ++++
>>   drivers/phy/Kconfig                                |   7 +
>>   drivers/phy/Makefile                               |   1 +
>>   drivers/phy/phy-rockchip-dp.c                      | 166
>> +++++++++++++++++++++ 4 files changed, 200 insertions(+)
>>   create mode 100644
>> Documentation/devicetree/bindings/phy/rockchip-dp-phy.txt create mode
>> 100644 drivers/phy/phy-rockchip-dp.c
>>
>> diff --git a/Documentation/devicetree/bindings/phy/rockchip-dp-phy.txt
>> b/Documentation/devicetree/bindings/phy/rockchip-dp-phy.txt new file mode
>> 100644
>> index 0000000..5de1088
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/rockchip-dp-phy.txt
>> @@ -0,0 +1,26 @@
>> +Rockchip Soc Seroes Display Port PHY
>> +------------------------------------
>> +
>> +Required properties:
>> +- compatible : should be one of the following supported values:
>> +	 - "rockchip.rk3288-dp-phy"
>> +
>> +- reg : a list of registers used by phy driver
> nodes do not necessarily need to have a regs property. You can do all
> operations via the grf syscon already.

Oh, yes, the dp phy power register is belong to GRF filed, thanks.

>
>> +- clocks: from common clock binding: handle to dp clock.
>> +	of memory mapped region.
>> +- clock-names: from common clock binding:
>> +	Required elements: "sclk_dp" "sclk_dp_24m"
>> +
>> +- rockchip,grf: this soc should set GRF regs, so need get grf here.
>> +- #phy-cells : from the generic PHY bindings, must be 0;
>> +
>> +Example:
>> +
>> +edp_phy: phy@ff770274 {
> edp_phy: edp-phy {

Done,

>
>
>> +	compatilble = "rockchip,rk3288-dp-phy";
>> +	reg = <0xff770274 4>;
> no regs property

Done

>> +	rockchip,grf = <&grf>;
>> +	clocks = <&cru SCLK_EDP_24M>;
>> +	clock-names = "24m";
>> +	#phy-cells = <0>;
>> +}
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 47da573..8f2bc4f 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -310,6 +310,13 @@ config PHY_ROCKCHIP_USB
>>   	help
>>   	  Enable this to support the Rockchip USB 2.0 PHY.
>>
>> +config PHY_ROCKCHIP_DP
>> +	tristate "Rockchip Display Port PHY Driver"
>> +	depends on ARCH_ROCKCHIP && OF
>> +	select GENERIC_PHY
>> +	help
>> +	  Enable this to support the Rockchip Display Port 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 a5b18c1..e281f35 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -34,6 +34,7 @@ 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-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
>>   obj-$(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-dp.c b/drivers/phy/phy-rockchip-dp.c
>> new file mode 100644
>> index 0000000..e9a726e
>> --- /dev/null
>> +++ b/drivers/phy/phy-rockchip-dp.c
>> @@ -0,0 +1,166 @@
>> +/*
>> + * Rockchip DP PHY driver
>> + *
>> + * Copyright (C) 2015 FuZhou Rockchip Co., Ltd.
>> + * Author: Yakir Yang <ykk@@rock-chips.com>
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/clk.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/regmap.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define GRF_SOC_CON12                   0x0274
>> +#define GRF_EDP_REF_CLK_SEL_INTER       BIT(4)
>> +
>> +#define DP_PHY_SIDDQ_WRITE_EN           BIT(21)
>> +#define DP_PHY_SIDDQ_ON                 0
>> +#define DP_PHY_SIDDQ_OFF                BIT(5)
>> +
>> +struct rockchip_dp_phy {
>> +	struct device  *dev;
>> +	struct regmap  *grf;
>> +	void __iomem   *regs;
>> +	struct clk     *phy_24m;
>> +};
>> +
>> +static int rockchip_dp_phy_clk_enable(struct rockchip_dp_phy *dp)
>> +{
>> +	int ret = 0;
>> +
>> +	ret = clk_set_rate(dp->phy_24m, 24000000);
>> +	if (ret < 0) {
>> +		dev_err(dp->dev, "cannot set clock phy_24m %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = clk_prepare_enable(dp->phy_24m);
>> +	if (ret < 0) {
>> +		dev_err(dp->dev, "cannot enable clock phy_24m %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rockchip_dp_phy_clk_disable(struct rockchip_dp_phy *dp)
>> +{
>> +	clk_disable_unprepare(dp->phy_24m);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rockchip_set_phy_state(struct phy *phy, bool enable)
>> +{
>> +	struct rockchip_dp_phy *dp = phy_get_drvdata(phy);
>> +
>> +	if (enable) {
>> +		rockchip_dp_phy_clk_enable(dp);
>> +		writel(DP_PHY_SIDDQ_WRITE_EN | DP_PHY_SIDDQ_ON, dp->regs);
>> +	} else {
>> +		rockchip_dp_phy_clk_disable(dp);
>> +		writel(DP_PHY_SIDDQ_WRITE_EN | DP_PHY_SIDDQ_OFF, dp->regs);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rockchip_dp_phy_power_on(struct phy *phy)
>> +{
>> +	return rockchip_set_phy_state(phy, true);
>> +}
>> +
>> +static int rockchip_dp_phy_power_off(struct phy *phy)
>> +{
>> +	return rockchip_set_phy_state(phy, false);
>> +}
>> +
>> +static struct phy_ops rockchip_dp_phy_ops = {
> static const struct ...
>
> see 4a9e5ca1a54a ("phy: Constify struct phy_ops variables")

Done, thanks

>
>> +	.power_on	= rockchip_dp_phy_power_on,
>> +	.power_off	= rockchip_dp_phy_power_off,
>> +	.owner		= THIS_MODULE,
>> +};
>> +
>> +static int rockchip_dp_phy_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	struct phy_provider *phy_provider;
>> +	struct rockchip_dp_phy *dp;
>> +	struct resource *res;
>> +	struct phy *phy;
>> +	int ret;
>> +
> I guess this could profit from a
>
> if (!np)
> 	return -ENODEV;

Hmm... so we are avoiding the no of_device case,

Done,

>> +	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
>> +	if (IS_ERR(dp))
>> +		return -ENOMEM;
>> +
>> +	dp->dev = dev;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	dp->regs = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(dp->regs))
>> +		return PTR_ERR(dp->regs);
>> +
>> +	dp->phy_24m = devm_clk_get(dev, "24m");
>> +	if (IS_ERR(dp->phy_24m)) {
>> +		dev_err(dev, "cannot get clock 24m\n");
>> +		return PTR_ERR(dp->phy_24m);
>> +	}
>> +
>> +	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
>> +	if (IS_ERR(dp->grf)) {
>> +		dev_err(dev, "rk3288-dp needs rockchip,grf property\n");
>> +		return PTR_ERR(dp->grf);
>> +	}
>> +
>> +	ret = regmap_write(dp->grf, GRF_SOC_CON12,
>> +			   GRF_EDP_REF_CLK_SEL_INTER |
>> +			   (GRF_EDP_REF_CLK_SEL_INTER << 16));
>> +	if (ret != 0) {
>> +		dev_err(dp->dev, "Could not config GRF edp ref clk: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	phy = devm(dev, NULL, &rockchip_dp_phy_ops, NULL);
> hmm, where did you find 4 params for devm_phy_create? Shouldn't this be
>
> 	phy = devm_phy_create(dev, np, &rockchip_dp_phy_ops);
>
> instead - and also include the phy dt-node as 2nd parameter?

Oh,  :-(=

I used to test the driver on chrome-3.14 branch, I always back the drm 
head file,
so there would be no drm conflict. But phy driver is missed, the 4 
params is come
from kernel-3.14.

Thanks for your redmind,
- Yakir

>
> Heiko
>
>> +	if (IS_ERR(phy)) {
>> +		dev_err(dev, "failed to create phy\n");
>> +		return PTR_ERR(phy);
>> +	}
>> +	phy_set_drvdata(phy, dp);
>> +
>> +	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_dp_phy_dt_ids[] = {
>> +	{ .compatible = "rockchip,rk3288-dp-phy" },
>> +	{}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, rockchip_dp_phy_dt_ids);
>> +
>> +static struct platform_driver rockchip_dp_phy_driver = {
>> +	.probe		= rockchip_dp_phy_probe,
>> +	.driver		= {
>> +		.name	= "rockchip-dp-phy",
>> +		.of_match_table = rockchip_dp_phy_dt_ids,
>> +	},
>> +};
>> +
>> +module_platform_driver(rockchip_dp_phy_driver);
>> +
>> +MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
>> +MODULE_DESCRIPTION("Rockchip DP PHY driver");
>> +MODULE_LICENSE("GPL v2");
>
>
>