From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f176.google.com (mail-yw1-f176.google.com [209.85.128.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 85E1F344024 for ; Thu, 7 May 2026 18:37:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778179037; cv=none; b=Scc5mY9eteBjtkHSpwU4RVcUSADNYtvuZ6rRr//Wa1gKjCApiNX31oD7unos480M5hh6KZDh9uGz26N2Q+yBShJ93bookYcftz0b77wdnVU37Xih2jGwpHpPvTTbuBy6dfq55fL7p0W/G30N3zgCCBmWCP9NWRahxmNbaks8ZaI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778179037; c=relaxed/simple; bh=0mU+Gr18j8ctUXlUwK5bdZXpnTobEBXi2+Wby91srKU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=kQQc+/5bEa3M6T2aSr3sWvPXYIrXmTJX7IgOxbojw5WmCZZsqqbIM/wd0dcdSw+2MOGkHhy1QCU/nLV7EIt7d+1mpsbdH9ReH20EaAu04sajMNo6RquDDKD94s6q4748BhLbDLRo9i3TV+K616M1gVQZ3K+jxKvwz/XZDbBSQcI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=riscstar.com; spf=pass smtp.mailfrom=riscstar.com; dkim=pass (2048-bit key) header.d=riscstar-com.20251104.gappssmtp.com header.i=@riscstar-com.20251104.gappssmtp.com header.b=TDHvjKWF; arc=none smtp.client-ip=209.85.128.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=riscstar.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=riscstar.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=riscstar-com.20251104.gappssmtp.com header.i=@riscstar-com.20251104.gappssmtp.com header.b="TDHvjKWF" Received: by mail-yw1-f176.google.com with SMTP id 00721157ae682-7bd810cdc5dso12883297b3.1 for ; Thu, 07 May 2026 11:37:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=riscstar-com.20251104.gappssmtp.com; s=20251104; t=1778179033; x=1778783833; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=x8i4c2z2WoES1t5qSKN6GUknygX5CCKfGDT1oqYJPeA=; b=TDHvjKWFJoWHC9uFBuMgwiI+qpUqrLa97iwkqGHkK6YH+7KGHpXRfS+PJZl9GG8e6h sw5zkqR2EGuac1g/0qK5Li6+rKi4imr+/0YiOML/PIIdvnT9MirAdTzpx+X6Gel1t1Qh ugXbJ58Q6MDG3W+6jAPopELHVxtJZk4uQu+ynhYF/ovQOygTd/XRfwp+0WSAZaS5+qKf AR2/9OX6zzDyEAa9Jp+65SrygIbNlQICtrz2IQr/QsyIOhII5ilo5DZIcmW+716/+Xfa pFSMvn/IW08crA2OuhcF2t4tbpxvGrbk0O4Jm1PcRrBJVpq24/+tOwi/fuT07WuXa43n qKtw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778179033; x=1778783833; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=x8i4c2z2WoES1t5qSKN6GUknygX5CCKfGDT1oqYJPeA=; b=REvr6YkGHiG4tOZqZej8Z/2+ODGBu8lY9h7Bubpn7RJ/B6tnLLBm75AP1Tma5Ajrxh HEl4eRmp2nT7wpUIayXVS8u6NE8QZTgJg7KjTFpk94PgxbjOEkqBhLmOmKL8ZJbFZ39F BMxLImhPnLXH7bxihAMDkIEARikdL0zYfDBNj0mDjbXt8HhIuBiYED+1r5otoKWzsWna JnmKwopSEz1q+VvRJFN3I/1E66aqdJUVLcl4su+6DND43zUtuzS7yuf2uMzX+x+9wTpX YP/XmXTzgvx4oZPYyKV48qh0J0544vkSj4B1eiTPmy7iU8mtMcjwDTM2O1fMLuGeBTEq 7Lfw== X-Forwarded-Encrypted: i=1; AFNElJ8GBFxKS3qqJfY6bzGml+r4pSO22rGSmpTkn7wP6elz6oQa1WoMTHrUh95f2DgC3/pgQR5DY8oFYcyt@vger.kernel.org X-Gm-Message-State: AOJu0Yx6gG+QzJ2ffscNNYkC/VoHqQmQ52THarRr8mCRHh6s6y+1TrGn W09/+NEkTQvXVdoVPOfxg51vKgA290xmEZLrMT1Uld3sqac0Zu7T2lvxkzSmPiGnDXs= X-Gm-Gg: Acq92OF4elHjs0haV77Zn84dcCUyLUcA0AIhh52jIazMmuCZHhrsMtHp/2FLbkcNCcM vRDMwFKDEBbvKpYHcTfYMBEybasq6DcWxnY9AhDzM+2bL/g7s7gdx8JwPjkkLj6sCCXVb0o1t5K EXKhRcdjkLfXqE6E78cHY22DcUEUO0/b2IMmGehkM2ZlbScoxBR5vlNqAvl2h3Fq98zCwN1uXtY kYD3OSqDIn04LhwDQY8SkpbQo4ylxHBgKVOwGEK9mk2H6SDas+YDgTXWth6i9I8lwt1jk4tYlcI jKVbCDdiGnVtl7LuqBJrmg0apkAJ9PiKcazhkVO88j50jHb1nPqOQDotZF1bxilgz9RE5vn6M2u Rjwg4ZUFQX4ZwzRg8abIYLMtfa57UgKyeFvm1cCCKwSwJbxyEf3Q8ILR7bc0gcQGU5ibVOpng+t Gocgb2Q4vhFwx+sjW6lkbcHcIUNs0jqcbBRhUY0TlHtd8TL5QgwoO9J4UJqrCHDEeJ X-Received: by 2002:a05:690c:6101:b0:7a3:7ad3:3e9e with SMTP id 00721157ae682-7bdf5e7cda0mr98323737b3.32.1778179033551; Thu, 07 May 2026 11:37:13 -0700 (PDT) Received: from [172.22.22.234] (c-75-72-117-212.hsd1.mn.comcast.net. [75.72.117.212]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd976fd09asm57064577b3.41.2026.05.07.11.37.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 May 2026 11:37:12 -0700 (PDT) Message-ID: <3c78f48c-6478-46d0-87c2-581bb58637dd@riscstar.com> Date: Thu, 7 May 2026 13:37:09 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 08/12] dt-bindings: net: toshiba,tc965x-dwmac: add TC956x Ethernet bridge To: Bjorn Andersson Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, maxime.chevallier@bootlin.com, rmk+kernel@armlinux.org.uk, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linusw@kernel.org, brgl@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, Daniel Thompson , mohd.anwar@oss.qualcomm.com, a0987203069@gmail.com, alexandre.torgue@foss.st.com, ast@kernel.org, boon.khai.ng@altera.com, chenchuangyu@xiaomi.com, chenhuacai@kernel.org, daniel@iogearbox.net, hawk@kernel.org, hkallweit1@gmail.com, inochiama@gmail.com, john.fastabend@gmail.com, julianbraha@gmail.com, livelycarpet87@gmail.com, matthew.gerlach@altera.com, mcoquelin.stm32@gmail.com, me@ziyao.cc, prabhakar.mahadev-lad.rj@bp.renesas.com, richardcochran@gmail.com, rohan.g.thomas@altera.com, sdf@fomichev.me, siyanteng@cqsoftware.com.cn, weishangjuan@eswincomputing.com, wens@kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260501155421.3329862-1-elder@riscstar.com> <20260501155421.3329862-9-elder@riscstar.com> Content-Language: en-US From: Alex Elder In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/7/26 9:12 AM, Bjorn Andersson wrote: > On Fri, May 01, 2026 at 10:54:16AM -0500, Alex Elder wrote: >> diff --git a/Documentation/devicetree/bindings/net/toshiba,tc956x-dwmac.yaml b/Documentation/devicetree/bindings/net/toshiba,tc956x-dwmac.yaml > [..] >> + >> + gpio-controller: true > > I don't have any concern with the use of a proper gpio driver to model > the implementation, but if I understand correctly this relationship > between gpio controller and gpio consumer is strictly internal to "the > PCI device". (I think you're already cool with this but I still wanted to respond.) That is not correct. These GPIO lines are used two ways for the RB3gen2: - drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c uses GPIOs 2 and 3 to assert/deassert the reset lines associated with the two exposed downstream PCIe ports on the PCIe switch within the TC956x. - Each of the Ethernet PHYs has a reset GPIO. On the RB3gen2, the GPIOs used for the purpose come from the GPIO controller embedded in the TC9564 (00 and 01). These are therefore "exposed" (they are *not* strictly internal). > Is this connection variable or is the link merely expressed in > DeviceTree to mitigate the fact that you choose to implement the > responsibilities of the two parts split into two device drivers? It is variable. These resets might be implemented by other GPIO controllers on other platforms. > Are there other consumers of these TC956x gpios which would result in a > board designer (and hence dts author) to ever reference this > gpio-controller in a different way? They could. Nine of these GPIOs are exposed by the TC956x pins (GPIO00-06, GPIO12, GPIO35 and GPIO36). The RB3gen2 uses 00-03 (and possibly 04 but that's for a PHY we haven't tested yet). -Alex > Regards, > Bjorn