linux-kernel - Re: [PATCH v1 4/4] phy: samsung: add Exynos2200 usb phy controller

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Message-ID: <9451f339-c8ff-4be2-9cde-1aaf78fa8e7b@gmail.com>
Date: Sun, 16 Feb 2025 11:58:59 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/4] phy: samsung: add Exynos2200 usb phy controller

On 2/16/25 11:36, Krzysztof Kozlowski wrote:
> On 15/02/2025 13:24, Ivaylo Ivanov wrote:
>> The Exynos2200 SoC comes with 3 PHYs - snps eUSB2, snps USBDP combophy
>> and a cut-off phy that origins from exynos5-usbdrd. The latter is used
>> for link control, as well as pipe3 attachment and detachment.
>>
>> Add a new driver for it.
>>
>> Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
>> ---
>>  drivers/phy/samsung/Kconfig                 |  13 ++
>>  drivers/phy/samsung/Makefile                |   1 +
>>  drivers/phy/samsung/phy-exynos2200-usbcon.c | 241 ++++++++++++++++++++
>>  include/linux/soc/samsung/exynos-regs-pmu.h |   3 +
>>  4 files changed, 258 insertions(+)
>>  create mode 100644 drivers/phy/samsung/phy-exynos2200-usbcon.c
>>
>> diff --git a/drivers/phy/samsung/Kconfig b/drivers/phy/samsung/Kconfig
>> index f62285254..47e9b9926 100644
>> --- a/drivers/phy/samsung/Kconfig
>> +++ b/drivers/phy/samsung/Kconfig
>> @@ -90,6 +90,19 @@ config PHY_EXYNOS2200_SNPS_EUSB2
>>  	  This driver provides PHY interface for eUSB 2.0 controller
>>  	  present on Exynos5 SoC series.
>>  
>> +config PHY_EXYNOS2200_USBCON
>> +	tristate "Exynos2200 USBCON PHY driver"
>> +	depends on (ARCH_EXYNOS && OF) || COMPILE_TEST
>> +	depends on HAS_IOMEM
>> +	depends on USB_DWC3_EXYNOS
> How? What are you using from DWC3?

Will drop.

>
>> +	select GENERIC_PHY
>> +	select MFD_SYSCON
>> +	default y
>> +	help
>> +	  Enable USBCON PHY support for Exynos2200 SoC.
>> +	  This driver provides PHY interface for USB controller present
>> +	  on Exynos2200 SoC.
>> +
>>  config PHY_EXYNOS5_USBDRD
>>  	tristate "Exynos5 SoC series USB DRD PHY driver"
>>  	depends on (ARCH_EXYNOS && OF) || COMPILE_TEST
>> diff --git a/drivers/phy/samsung/Makefile b/drivers/phy/samsung/Makefile
>> index 90b84c7fc..f70e12ddf 100644
>> --- a/drivers/phy/samsung/Makefile
>> +++ b/drivers/phy/samsung/Makefile
>> @@ -15,5 +15,6 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4X12_USB2)	+= phy-exynos4x12-usb2.o
>>  phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2)	+= phy-exynos5250-usb2.o
>>  phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>>  obj-$(CONFIG_PHY_EXYNOS2200_SNPS_EUSB2)	+= phy-exynos2200-snps-eusb2.o
>> +obj-$(CONFIG_PHY_EXYNOS2200_USBCON)	+= phy-exynos2200-usbcon.o
>>  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>>  obj-$(CONFIG_PHY_EXYNOS5250_SATA)	+= phy-exynos5250-sata.o
>> diff --git a/drivers/phy/samsung/phy-exynos2200-usbcon.c b/drivers/phy/samsung/phy-exynos2200-usbcon.c
>> new file mode 100644
>> index 000000000..7968c9792
>> --- /dev/null
>> +++ b/drivers/phy/samsung/phy-exynos2200-usbcon.c
>> @@ -0,0 +1,241 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (c) 2025, Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
>> + */
>> +
>> +#include <linux/bitfield.h>
> Are you using this header?
>
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/iopoll.h>
> And rhis?
>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/reset.h>
> And this?

Nope, it's a leftover I forgot to drop. Same with the above

...
> Same comments as on previous patch.

Alright. Thanks for the feedback!

Best regards,
Ivaylo

>
>
>
> Best regards,
> Krzysztof