linux-kernel - Re: [PATCH v3 5/8] phy: amlogic: add Amlogic G12A USB2 PHY Driver

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Date:   Mon, 18 Mar 2019 12:28:12 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Kishon Vijay Abraham I <kishon@...com>, gregkh@...uxfoundation.org,
        hminas@...opsys.com, balbi@...nel.org
Cc:     linux-amlogic@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v3 5/8] phy: amlogic: add Amlogic G12A USB2 PHY Driver

On 18/03/2019 11:18, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On 18/03/19 3:41 PM, Neil Armstrong wrote:
>> This adds support for the USB2 PHY found in the Amlogic G12A SoC Family.
>>
>> It supports Host and/or Peripheral mode, depending on it's position.
>> The first PHY is only used as Host, but the second supports Dual modes
>> defined by the USB Control Glue HW in front of the USB Controllers.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>> ---
>>  drivers/phy/amlogic/Kconfig               |  11 ++
>>  drivers/phy/amlogic/Makefile              |   1 +
>>  drivers/phy/amlogic/phy-meson-g12a-usb2.c | 189 ++++++++++++++++++++++
>>  3 files changed, 201 insertions(+)
>>  create mode 100644 drivers/phy/amlogic/phy-meson-g12a-usb2.c
>>
>> diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
>> index 23fe1cda2f70..560ff0f1ed4c 100644
>> --- a/drivers/phy/amlogic/Kconfig
>> +++ b/drivers/phy/amlogic/Kconfig
>> @@ -36,3 +36,14 @@ config PHY_MESON_GXL_USB3
>>  	  Enable this to support the Meson USB3 PHY and OTG detection
>>  	  IP block found in Meson GXL and GXM SoCs.
>>  	  If unsure, say N.
>> +
>> +config PHY_MESON_G12A_USB2
>> +	tristate "Meson G12A USB2 PHY driver"
>> +	default ARCH_MESON
>> +	depends on OF && (ARCH_MESON || COMPILE_TEST)
>> +	select GENERIC_PHY
>> +	select REGMAP_MMIO
>> +	help
>> +	  Enable this to support the Meson USB2 PHYs found in Meson
>> +	  G12A SoCs.
>> +	  If unsure, say N.
>> diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
>> index 4fd8848c194d..7d4d10f5a6b3 100644
>> --- a/drivers/phy/amlogic/Makefile
>> +++ b/drivers/phy/amlogic/Makefile
>> @@ -1,3 +1,4 @@
>>  obj-$(CONFIG_PHY_MESON8B_USB2)		+= phy-meson8b-usb2.o
>>  obj-$(CONFIG_PHY_MESON_GXL_USB2)	+= phy-meson-gxl-usb2.o
>> +obj-$(CONFIG_PHY_MESON_G12A_USB2)	+= phy-meson-g12a-usb2.o
>>  obj-$(CONFIG_PHY_MESON_GXL_USB3)	+= phy-meson-gxl-usb3.o
>> diff --git a/drivers/phy/amlogic/phy-meson-g12a-usb2.c b/drivers/phy/amlogic/phy-meson-g12a-usb2.c
>> new file mode 100644
>> index 000000000000..9f35259f237f
>> --- /dev/null
>> +++ b/drivers/phy/amlogic/phy-meson-g12a-usb2.c
>> @@ -0,0 +1,189 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Meson G12A USB2 PHY driver
>> + *
>> + * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>> + * Copyright (C) 2017 Amlogic, Inc. All rights reserved
>> + * Copyright (C) 2019 BayLibre, SAS
>> + * Author: Neil Armstrong <narmstrong@...libre.com>
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/reset.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define PHY_CTRL_R0						0x0
>> +#define PHY_CTRL_R1						0x4
>> +#define PHY_CTRL_R2						0x8
>> +#define PHY_CTRL_R3						0xc
>> +#define PHY_CTRL_R4						0x10
>> +#define PHY_CTRL_R5						0x14
>> +#define PHY_CTRL_R6						0x18
>> +#define PHY_CTRL_R7						0x1c
>> +#define PHY_CTRL_R8						0x20
>> +#define PHY_CTRL_R9						0x24
>> +#define PHY_CTRL_R10						0x28
>> +#define PHY_CTRL_R11						0x2c
>> +#define PHY_CTRL_R12						0x30
>> +#define PHY_CTRL_R13						0x34
>> +#define PHY_CTRL_R14						0x38
>> +#define PHY_CTRL_R15						0x3c
>> +#define PHY_CTRL_R16						0x40
>> +#define PHY_CTRL_R17						0x44
>> +#define PHY_CTRL_R18						0x48
>> +#define PHY_CTRL_R19						0x4c
>> +#define PHY_CTRL_R20						0x50
>> +#define PHY_CTRL_R21						0x54
>> +#define PHY_CTRL_R22						0x58
>> +#define PHY_CTRL_R23						0x5c
>> +
>> +#define RESET_COMPLETE_TIME					1000
>> +#define PLL_RESET_COMPLETE_TIME					100
>> +
>> +struct phy_meson_g12a_usb2_priv {
>> +	struct device		*dev;
>> +	struct regmap		*regmap;
>> +	struct clk		*clk;
>> +	struct reset_control	*reset;
>> +};
>> +
>> +static const struct regmap_config phy_meson_g12a_usb2_regmap_conf = {
>> +	.reg_bits = 8,
>> +	.val_bits = 32,
>> +	.reg_stride = 4,
>> +	.max_register = PHY_CTRL_R23,
>> +};
>> +
>> +static int phy_meson_g12a_usb2_init(struct phy *phy)
>> +{
>> +	struct phy_meson_g12a_usb2_priv *priv = phy_get_drvdata(phy);
>> +	int ret;
>> +
>> +	ret = reset_control_reset(priv->reset);
>> +	if (ret)
>> +		return ret;
>> +
>> +	udelay(RESET_COMPLETE_TIME);
>> +
>> +	/* usb2_otg_aca_en == 0 */
>> +	regmap_update_bits(priv->regmap, PHY_CTRL_R21, BIT(2), 0);
>> +
>> +	/* PLL Setup : 24MHz * 20 / 1 = 480MHz */
>> +	regmap_write(priv->regmap, PHY_CTRL_R16, 0x39400414);
>> +	regmap_write(priv->regmap, PHY_CTRL_R17, 0x927e0000);
>> +	regmap_write(priv->regmap, PHY_CTRL_R18, 0xac5f49e5);
> 
> Please add macros for each of the individual bit-fields.

Will resent with this added.

Neil

>> +
>> +	udelay(PLL_RESET_COMPLETE_TIME);
>> +
>> +	/* UnReset PLL */
>> +	regmap_write(priv->regmap, PHY_CTRL_R16, 0x19400414);
> 
> Here too..
> 
> Thanks
> Kishon
>