From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BC278467 for ; Thu, 23 May 2024 03:05:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716433546; cv=none; b=VF0nLf0ThJ6R8YsgB/bR0RCHFNuHkcd68Fxlh23RwiudVxe+rfP9p+cL3dROsq9lF4toPpPAWyPD9GU+6hrmZre5uMo/i58vDnJVHI0sifMOhuc/De/79Cm11dr0u+3ehAEl3p7P/IAupsh4jmkbhDgGfBKdF9eVJwavdBgG5ks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716433546; c=relaxed/simple; bh=7DaPTZBGkttvXDB8AfLhqx6sF7jNWK9QRVpfv2fzxfA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=NOrPmzXGZUyHTic+kRNBD4nJ5wr1fdIza1S/9PH9SO+ySX2YgNm7pB+UccZpUz2Ej/S/iPwQz7bFG8A2THomKFOBynPliWU0Jboom+lLnNCD8lrx+3tWTwU6v/TVT6duLtcJAMUb843f26V6I9rh2amRKbtUbKvzOxi/u4u2dq0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=jookia.org; spf=none smtp.mailfrom=jookia.org; dkim=pass (2048-bit key) header.d=jookia.org header.i=@jookia.org header.b=FhxcBbdS; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=jookia.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=jookia.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=jookia.org header.i=@jookia.org header.b="FhxcBbdS" X-Envelope-To: kikuchan98@gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jookia.org; s=key1; t=1716433542; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5pCVOTMBUtF61UbWtvu2nKJhMTtTjKGnydb/Jdcjr8w=; b=FhxcBbdSQ46OFbvgAWdxQJA7GZW9tW+Rqg67JJJviT54ZJTH6ulBW8YIa9jNvxyuDsNw2f 2M/1OGKt48ujYuqKtg2WOKVbf9LUj5QLVbw/xYFNEUyfmwF6cxVDatxWTSgeHR7Hpj3lwo p4TZSrMq25uv13sjXX7HUuRJ+wBZu1717d/7y3dAv8crxXQdQAn4NIQ2pxyxbdK73ytwhD CnU1avWfaB1loIYCZTer/ek+TfsfD6DdW2iZ7ZFrVwJf8eiQ0i9voPBMW9Fv0CpU0s6OfJ NzE/w7FHeZbUlwG2pXmyhTBWO+UfBPnwD4Mq+W+09cbkaS04YQFNocDyVfIOOg== X-Envelope-To: privatesub2@gmail.com X-Envelope-To: aou@eecs.berkeley.edu X-Envelope-To: bigunclemax@gmail.com X-Envelope-To: conor+dt@kernel.org X-Envelope-To: devicetree@vger.kernel.org X-Envelope-To: fusibrandon13@gmail.com X-Envelope-To: jernej.skrabec@gmail.com X-Envelope-To: krzk+dt@kernel.org X-Envelope-To: linux-arm-kernel@lists.infradead.org X-Envelope-To: linux-kernel@vger.kernel.org X-Envelope-To: linux-pwm@vger.kernel.org X-Envelope-To: linux-riscv@lists.infradead.org X-Envelope-To: linux-sunxi@lists.linux.dev X-Envelope-To: mkl@pengutronix.de X-Envelope-To: p.zabel@pengutronix.de X-Envelope-To: palmer@dabbelt.com X-Envelope-To: paul.walmsley@sifive.com X-Envelope-To: robh@kernel.org X-Envelope-To: samuel@sholland.org X-Envelope-To: ukleinek@kernel.org X-Envelope-To: wens@csie.org Date: Thu, 23 May 2024 13:04:11 +1000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: John Watts To: =?utf-8?B?44GN44GP44Gh44KD44KT44GV44KT?= Cc: privatesub2@gmail.com, aou@eecs.berkeley.edu, bigunclemax@gmail.com, conor+dt@kernel.org, devicetree@vger.kernel.org, fusibrandon13@gmail.com, jernej.skrabec@gmail.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev, mkl@pengutronix.de, p.zabel@pengutronix.de, palmer@dabbelt.com, paul.walmsley@sifive.com, robh@kernel.org, samuel@sholland.org, ukleinek@kernel.org, wens@csie.org Subject: Re: [PATCH v9 0/3] Add support for Allwinner PWM on D1/T113s/R329 SoCs Message-ID: References: Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Migadu-Flow: FLOW_OUT On Thu, May 23, 2024 at 11:26:07AM +0900, きくちゃんさん wrote: > Hello Aleksandr, > > I had coincidentally developed a PWM driver for the device. > Based on my experience, I find that dynamically changing the coupled > DIV_M value is quite complex. > The current approach has limitations, especially with resolution > changes, which can be unpredictable for users. For example: > > 1. Enabling channel A automatically selects DIV_M. > 2. Enabling coupled channel B with a specific period may result in > poor resolution for channel B, as the DIV_M value depends on the > period of channel A. > 3. If channel B is enabled first, channel A may not be enabled if > its period doesn't fit the DIV_M range selected by channel B. > > Additionally, using APB as a clock source for the channels would > further complicate the process. > > To simplify this, I suggest (maybe for the future) specifying these > values directly in the Device Tree like this: > ``` > allwinner,pwm-coupled-channel-clock-sources="hosc", "apb", "hosc"; > allwinner,pwm-coupled-channel-clock-prescales=<0>, <3>, <8>; > ``` > This would delegate the complexity to the DT, making the resolution > predictable for users. > As a bonus, it introduces a way to select clock sources for each > coupled channels. > > For the meantime, I think it is enough to use fixed "hosc" and <0> for > regular use. > > Looking forward to your thoughts. > > Best regards, > kikuchan. I have a somewhat opposite opinion. I've developed a driver too and posted it on the u-boot mailing list that is deterministic and handles both channels: https://lore.kernel.org/all/20240518-pwm_d1-v1-0-311fc5fe2248@jookia.org/ It does this by remembering the settings for channels and disabling then setting both channels at once whenever there's an update. I think this is a decent enough solution to the problem and just works automatically without people having to micromanage the controller. John. 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 29D68C25B79 for ; Thu, 23 May 2024 03:06:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=2U1B3zWG50ItykHWVBPXE6xLTGddHJ2bJuvchsnTLN0=; b=LSszVX1RA9o0vq g3YLkzXMRrYtBUNewQHTlxsdMHyNuyytJ+VDVeIo/vLOVKGgJMZl/i9YgbLSX70v02i+XdYSPQm4/ q9Ah8J1wJut3+PkMSP613ZqTHFgnj9oOCzl1BwUblf9HxJKE9+Z8hbboIxw6qroP10EQYY8NDMPEF bpvGQE5P1zr6GCK/Y/xWyzllC5fzDaAAAclgn+M3n9GJW1Ukk5a0yJK0MFsgwDc40c7rC7xhxyHWW vOg1QAa6UI8vO8bflFVSP/V0fzDzEGFvyfiw+ujcfAFKuhlITf/BEYfSeMs7jSdcCsFDz51YjhsTb idSP2XLuYyskiFGQ5gkg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s9ymH-00000004qlP-1L2A; Thu, 23 May 2024 03:06:01 +0000 Received: from out-171.mta1.migadu.com ([95.215.58.171]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s9ym8-00000004qgM-306p for linux-riscv@lists.infradead.org; Thu, 23 May 2024 03:05:59 +0000 X-Envelope-To: kikuchan98@gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jookia.org; s=key1; t=1716433542; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5pCVOTMBUtF61UbWtvu2nKJhMTtTjKGnydb/Jdcjr8w=; b=FhxcBbdSQ46OFbvgAWdxQJA7GZW9tW+Rqg67JJJviT54ZJTH6ulBW8YIa9jNvxyuDsNw2f 2M/1OGKt48ujYuqKtg2WOKVbf9LUj5QLVbw/xYFNEUyfmwF6cxVDatxWTSgeHR7Hpj3lwo p4TZSrMq25uv13sjXX7HUuRJ+wBZu1717d/7y3dAv8crxXQdQAn4NIQ2pxyxbdK73ytwhD CnU1avWfaB1loIYCZTer/ek+TfsfD6DdW2iZ7ZFrVwJf8eiQ0i9voPBMW9Fv0CpU0s6OfJ NzE/w7FHeZbUlwG2pXmyhTBWO+UfBPnwD4Mq+W+09cbkaS04YQFNocDyVfIOOg== X-Envelope-To: privatesub2@gmail.com X-Envelope-To: aou@eecs.berkeley.edu X-Envelope-To: bigunclemax@gmail.com X-Envelope-To: conor+dt@kernel.org X-Envelope-To: devicetree@vger.kernel.org X-Envelope-To: fusibrandon13@gmail.com X-Envelope-To: jernej.skrabec@gmail.com X-Envelope-To: krzk+dt@kernel.org X-Envelope-To: linux-arm-kernel@lists.infradead.org X-Envelope-To: linux-kernel@vger.kernel.org X-Envelope-To: linux-pwm@vger.kernel.org X-Envelope-To: linux-riscv@lists.infradead.org X-Envelope-To: linux-sunxi@lists.linux.dev X-Envelope-To: mkl@pengutronix.de X-Envelope-To: p.zabel@pengutronix.de X-Envelope-To: palmer@dabbelt.com X-Envelope-To: paul.walmsley@sifive.com X-Envelope-To: robh@kernel.org X-Envelope-To: samuel@sholland.org X-Envelope-To: ukleinek@kernel.org X-Envelope-To: wens@csie.org Date: Thu, 23 May 2024 13:04:11 +1000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: John Watts To: =?utf-8?B?44GN44GP44Gh44KD44KT44GV44KT?= Cc: privatesub2@gmail.com, aou@eecs.berkeley.edu, bigunclemax@gmail.com, conor+dt@kernel.org, devicetree@vger.kernel.org, fusibrandon13@gmail.com, jernej.skrabec@gmail.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev, mkl@pengutronix.de, p.zabel@pengutronix.de, palmer@dabbelt.com, paul.walmsley@sifive.com, robh@kernel.org, samuel@sholland.org, ukleinek@kernel.org, wens@csie.org Subject: Re: [PATCH v9 0/3] Add support for Allwinner PWM on D1/T113s/R329 SoCs Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240522_200553_054742_F2128E2F X-CRM114-Status: GOOD ( 19.76 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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From: John Watts To: =?utf-8?B?44GN44GP44Gh44KD44KT44GV44KT?= Cc: privatesub2@gmail.com, aou@eecs.berkeley.edu, bigunclemax@gmail.com, conor+dt@kernel.org, devicetree@vger.kernel.org, fusibrandon13@gmail.com, jernej.skrabec@gmail.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev, mkl@pengutronix.de, p.zabel@pengutronix.de, palmer@dabbelt.com, paul.walmsley@sifive.com, robh@kernel.org, samuel@sholland.org, ukleinek@kernel.org, wens@csie.org Subject: Re: [PATCH v9 0/3] Add support for Allwinner PWM on D1/T113s/R329 SoCs Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240522_200551_593573_CA4246FA X-CRM114-Status: GOOD ( 20.76 ) 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: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVGh1LCBNYXkgMjMsIDIwMjQgYXQgMTE6MjY6MDdBTSArMDkwMCwg44GN44GP44Gh44KD44KT 44GV44KTIHdyb3RlOgo+IEhlbGxvIEFsZWtzYW5kciwKPiAKPiBJIGhhZCBjb2luY2lkZW50YWxs eSBkZXZlbG9wZWQgYSBQV00gZHJpdmVyIGZvciB0aGUgZGV2aWNlLgo+IEJhc2VkIG9uIG15IGV4 cGVyaWVuY2UsIEkgZmluZCB0aGF0IGR5bmFtaWNhbGx5IGNoYW5naW5nIHRoZSBjb3VwbGVkCj4g RElWX00gdmFsdWUgaXMgcXVpdGUgY29tcGxleC4KPiBUaGUgY3VycmVudCBhcHByb2FjaCBoYXMg bGltaXRhdGlvbnMsIGVzcGVjaWFsbHkgd2l0aCByZXNvbHV0aW9uCj4gY2hhbmdlcywgd2hpY2gg Y2FuIGJlIHVucHJlZGljdGFibGUgZm9yIHVzZXJzLiBGb3IgZXhhbXBsZToKPiAKPiAgIDEuIEVu YWJsaW5nIGNoYW5uZWwgQSBhdXRvbWF0aWNhbGx5IHNlbGVjdHMgRElWX00uCj4gICAyLiBFbmFi bGluZyBjb3VwbGVkIGNoYW5uZWwgQiB3aXRoIGEgc3BlY2lmaWMgcGVyaW9kIG1heSByZXN1bHQg aW4KPiBwb29yIHJlc29sdXRpb24gZm9yIGNoYW5uZWwgQiwgYXMgdGhlIERJVl9NIHZhbHVlIGRl cGVuZHMgb24gdGhlCj4gcGVyaW9kIG9mIGNoYW5uZWwgQS4KPiAgIDMuIElmIGNoYW5uZWwgQiBp cyBlbmFibGVkIGZpcnN0LCBjaGFubmVsIEEgbWF5IG5vdCBiZSBlbmFibGVkIGlmCj4gaXRzIHBl cmlvZCBkb2Vzbid0IGZpdCB0aGUgRElWX00gcmFuZ2Ugc2VsZWN0ZWQgYnkgY2hhbm5lbCBCLgo+ IAo+IEFkZGl0aW9uYWxseSwgdXNpbmcgQVBCIGFzIGEgY2xvY2sgc291cmNlIGZvciB0aGUgY2hh bm5lbHMgd291bGQKPiBmdXJ0aGVyIGNvbXBsaWNhdGUgdGhlIHByb2Nlc3MuCj4gCj4gVG8gc2lt cGxpZnkgdGhpcywgSSBzdWdnZXN0IChtYXliZSBmb3IgdGhlIGZ1dHVyZSkgc3BlY2lmeWluZyB0 aGVzZQo+IHZhbHVlcyBkaXJlY3RseSBpbiB0aGUgRGV2aWNlIFRyZWUgbGlrZSB0aGlzOgo+IGBg YAo+IGFsbHdpbm5lcixwd20tY291cGxlZC1jaGFubmVsLWNsb2NrLXNvdXJjZXM9Imhvc2MiLCAi YXBiIiwgImhvc2MiOwo+IGFsbHdpbm5lcixwd20tY291cGxlZC1jaGFubmVsLWNsb2NrLXByZXNj YWxlcz08MD4sIDwzPiwgPDg+Owo+IGBgYAo+IFRoaXMgd291bGQgZGVsZWdhdGUgdGhlIGNvbXBs ZXhpdHkgdG8gdGhlIERULCBtYWtpbmcgdGhlIHJlc29sdXRpb24KPiBwcmVkaWN0YWJsZSBmb3Ig dXNlcnMuCj4gQXMgYSBib251cywgaXQgaW50cm9kdWNlcyBhIHdheSB0byBzZWxlY3QgY2xvY2sg c291cmNlcyBmb3IgZWFjaAo+IGNvdXBsZWQgY2hhbm5lbHMuCj4gCj4gRm9yIHRoZSBtZWFudGlt ZSwgSSB0aGluayBpdCBpcyBlbm91Z2ggdG8gdXNlIGZpeGVkICJob3NjIiBhbmQgPDA+IGZvcgo+ IHJlZ3VsYXIgdXNlLgo+IAo+IExvb2tpbmcgZm9yd2FyZCB0byB5b3VyIHRob3VnaHRzLgo+IAo+ IEJlc3QgcmVnYXJkcywKPiBraWt1Y2hhbi4KCkkgaGF2ZSBhIHNvbWV3aGF0IG9wcG9zaXRlIG9w aW5pb24uIEkndmUgZGV2ZWxvcGVkIGEgZHJpdmVyIHRvbyBhbmQgcG9zdGVkIGl0Cm9uIHRoZSB1 LWJvb3QgbWFpbGluZyBsaXN0IHRoYXQgaXMgZGV0ZXJtaW5pc3RpYyBhbmQgaGFuZGxlcyBib3Ro IGNoYW5uZWxzOgoKaHR0cHM6Ly9sb3JlLmtlcm5lbC5vcmcvYWxsLzIwMjQwNTE4LXB3bV9kMS12 MS0wLTMxMWZjNWZlMjI0OEBqb29raWEub3JnLwoKSXQgZG9lcyB0aGlzIGJ5IHJlbWVtYmVyaW5n IHRoZSBzZXR0aW5ncyBmb3IgY2hhbm5lbHMgYW5kIGRpc2FibGluZyB0aGVuCnNldHRpbmcgYm90 aCBjaGFubmVscyBhdCBvbmNlIHdoZW5ldmVyIHRoZXJlJ3MgYW4gdXBkYXRlLgoKSSB0aGluayB0 aGlzIGlzIGEgZGVjZW50IGVub3VnaCBzb2x1dGlvbiB0byB0aGUgcHJvYmxlbSBhbmQganVzdCB3 b3JrcwphdXRvbWF0aWNhbGx5IHdpdGhvdXQgcGVvcGxlIGhhdmluZyB0byBtaWNyb21hbmFnZSB0 aGUgY29udHJvbGxlci4KCkpvaG4uCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2Vy bmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1h bi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==