From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2E2C8C3DA4A for ; Mon, 15 Jul 2024 17:47:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=z51K8o9x7VSwDSMjdiniga3mDawo7EOQdNNgHhWH1IE=; b=amJugbv2qBN87DRrb1PVPDH5rU yASPxUbpFv+oCbo4bpkCOF/G3SuRLagRoxH6TnlJCkAt/QVFcMcKuYK0fIT/4XfQVNfy++mWVT7bo oD9XuckvUSRBBBgfPerjo+8+DpdiDNtq+D+K1HhklBofqYHtnB20pR0rch3CYtDgnKwkGQ/SL+cKH uOQf1lGD8v/mToEV28MUnSEu45Dte2+63eLa58+9AIv99+V7zoTtzTMkBADmvV/Bt2Uvm2EiW75Bn P0TwHf7/09ajntl1tcux5cgFIC3tj7Ewikz650qPmHp+tB3fbuH7nlRrY4deIKMmWeGK5CvkZVMUb klJJ93KQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sTPmt-00000007uoK-2W2h; Mon, 15 Jul 2024 17:46:59 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sTPma-00000007ukL-028Z; Mon, 15 Jul 2024 17:46:41 +0000 Received: from i5e860d09.versanet.de ([94.134.13.9] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sTPmK-0001Bk-MA; Mon, 15 Jul 2024 19:46:24 +0200 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Dragan Simic Cc: mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: Re: [PATCH v2 1/3] dt-bindings: clocks: add binding for voltage-controlled-oscillators Date: Mon, 15 Jul 2024 19:46:23 +0200 Message-ID: <2832997.XrmoMso0CX@diego> In-Reply-To: References: <20240715110251.261844-1-heiko@sntech.de> <20240715110251.261844-2-heiko@sntech.de> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240715_104640_083887_C8D5EE72 X-CRM114-Status: GOOD ( 30.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dragan, Am Montag, 15. Juli 2024, 17:15:45 CEST schrieb Dragan Simic: > On 2024-07-15 13:02, Heiko Stuebner wrote: > > In contrast to fixed clocks that are described as ungateable, boards > > sometimes use additional oscillators for things like PCIe reference > > clocks, that need actual supplies to get enabled and enable-gpios to be > > toggled for them to work. > > > > This adds a binding for such oscillators that are not configurable > > themself, but need to handle supplies for them to work. > > > > In schematics they often can be seen as > > > > ---------------- > > Enable - | 100MHz,3.3V, | - VDD > > | 3225 | > > GND - | | - OUT > > ---------------- > > > > or similar. The enable pin might be separate but can also just be tied > > to the vdd supply, hence it is optional in the binding. > > > > Signed-off-by: Heiko Stuebner > > --- > > .../bindings/clock/voltage-oscillator.yaml | 49 +++++++++++++++++++ > > 1 file changed, 49 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/clock/voltage-oscillator.yaml > > > > diff --git > > a/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml > > b/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml > > new file mode 100644 > > index 0000000000000..8bff6b0fd582e > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/clock/voltage-oscillator.yaml > > @@ -0,0 +1,49 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/clock/voltage-oscillator.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: Voltage controlled oscillator > > Frankly, I find the "voltage-oscillator" and "voltage controlled > oscillator" names awkward. In general, "clock" is used throughout > the entire kernel, when it comes to naming files and defining > "compatible" strings. Thus, I'd suggest that "clock" is used here > instead of "oscillator", because it's consistent and shorter. > > How about using "gated-clock" for the "compatible" string, and > "Simple gated clock generator" instead of "voltage controlled > oscillator"? Besides sounding awkward, "voltage controlled > oscillator" may suggest that the clock generator can be adjusted > or programmed somehow by applying the voltage, while it can only > be enabled or disabled that way, which is by definition clock > gating. Thus, "gated-clock" and "Simple gated clock generator" > would fit very well. The naming came from Stephen - one of the clock maintainers ;-) See discussion in v1. Who also described these things as "voltage-controlled-oscillators". And from that discussion I also got the impression we should aim for more specific naming - especially when talking about dt-bindings, for this "usage in the Linux kernel" actually isn't a suitable metric and "gated-clock" is probably way too generic I think. Though I'm not attached to any specific naming, so we'll simply wait for the clock- and dt-maintainers to weigh in ;-) Heiko