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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tjbPu-00000001bX1-1pc3; Sun, 16 Feb 2025 09:58:26 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tjbCC-00000001ZuX-3PqM; Sun, 16 Feb 2025 09:44:17 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id EFA5EA40532; Sun, 16 Feb 2025 09:42:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F8BFC4CEDD; Sun, 16 Feb 2025 09:44:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739699055; bh=zD0KT9CZGcw7t13T9u3q2BqVesbZ0W0Wa6rgYZKhLmA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=UFbKd6S/vwLqDQywKStuwPzw8ZvHttgL+NliLzZHxFxnFyX9gqse06lNgH1ZCixPN jeEOJmEQnjSy6ShWpLf+4s3l/6RtyySfPuY5to3R747CykItS6lV0SY1eT3eEg10oQ uABtZFs3CKsBBCOGRKgQ1Gf9hGBy4DN+4gBEEliQ8eCJV52PXAdCAemOERqacZao0m WVKMpK32v04pFq6wI5ZxrZE3Dhxl9CpzXKncjIFG6OG6gIKy3CR0nW7NiX94JurHqH aC7SHlW+W1TdUTePxORhnxRWOO7rjwQCl2zchxPOBPZuwrYlu4cX0NscGZW6oYY5KG 3z3OAgL22RWGg== Message-ID: <9b58a985-3d63-42bb-9a76-e5b04a4b6012@kernel.org> Date: Sun, 16 Feb 2025 10:44:08 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 3/4] phy: samsung: add Exynos2200 SNPS eUSB2 driver To: Ivaylo Ivanov , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar , Philipp Zabel Cc: linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250215122409.162810-1-ivo.ivanov.ivanov1@gmail.com> <20250215122409.162810-4-ivo.ivanov.ivanov1@gmail.com> <537698af-841f-48e7-bd7c-4077d0a240a1@gmail.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 16/02/2025 10:41, Ivaylo Ivanov wrote: > On 2/16/25 11:26, Krzysztof Kozlowski wrote: >> On 15/02/2025 13:24, Ivaylo Ivanov wrote: >>> The Exynos2200 SoC uses Synopsis eUSB2 PHY for USB 2.0. Add a new >>> driver for it. >>> >>> eUSB2 on Exynos SoCs is usually paired alongside a USB PHY controller. >>> Currently the driver is modelled to take and enable/disable the usb phy >>> controller when needed. >>> >>> The driver is based on information from downstream drivers. >>> >>> Signed-off-by: Ivaylo Ivanov >>> --- >>> drivers/phy/samsung/Kconfig | 13 + >>> drivers/phy/samsung/Makefile | 1 + >>> .../phy/samsung/phy-exynos2200-snps-eusb2.c | 351 ++++++++++++++++++ >>> 3 files changed, 365 insertions(+) >>> create mode 100644 drivers/phy/samsung/phy-exynos2200-snps-eusb2.c >>> >>> diff --git a/drivers/phy/samsung/Kconfig b/drivers/phy/samsung/Kconfig >>> index e2330b089..f62285254 100644 >>> --- a/drivers/phy/samsung/Kconfig >>> +++ b/drivers/phy/samsung/Kconfig >>> @@ -77,6 +77,19 @@ config PHY_S5PV210_USB2 >>> particular SoC is compiled in the driver. In case of S5PV210 two phys >>> are available - device and host. >>> >>> +config PHY_EXYNOS2200_SNPS_EUSB2 >>> + tristate "Exynos2200 eUSB 2.0 PHY driver" >>> + depends on (ARCH_EXYNOS && OF) || COMPILE_TEST >>> + depends on HAS_IOMEM >>> + depends on USB_DWC3_EXYNOS >> >> How does it depend? What are you using from DWC3? > > Can drop, I guess. > >> >>> + select GENERIC_PHY >>> + select MFD_SYSCON >> Where do you use it? > > Remained from USBCON driver. > >> >>> + default y >>> + help >>> + Enable USBCON PHY support for Exynos2200 SoC. >>> + This driver provides PHY interface for eUSB 2.0 controller >>> + present on Exynos5 SoC series. >>> + >>> 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 fea1f96d0..90b84c7fc 100644 >>> --- a/drivers/phy/samsung/Makefile >>> +++ b/drivers/phy/samsung/Makefile >>> @@ -14,5 +14,6 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o >>> phy-exynos-usb2-$(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 >> Entire driver looks like repeating existing qcom-snps-eusb2. > > It's the same IP, but implemented differently on a different platform. At > the very least, the register layout is different. I checked few registers, looked very the same. Same blocks from synopsys have the common register layouts. > >> You need to >> integrate the changes, not create duplicated driver. > > I can do that, but it would be come a bit cluttered, won't it? Depends on > if we want to follow the current oem-provided initialization sequence, or > try and fully reuse what we have in there. I think it duplicates a lot, so it won't be clutter. We have many drivers having common code and per-variant ops. Best regards, Krzysztof -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy