From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 8D3652EB5A6 for ; Mon, 11 May 2026 15:22:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778512923; cv=none; b=DxN1Ii1cLbLsUTe0rgeGfFQsZVAQ0iV5vzdGTtb4V2kkUvAUC5L/+5rcHxIw99qc20WbaZUyQqu1Ns5+EI1DxCd4N2tGRD7HCXYsS/8s7LY4+lGb/jortH1urmylXeRT5Kw25s+fqqN/b/svBwer9fEY0uKFi/JNs01MDrUcBLo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778512923; c=relaxed/simple; bh=JcObBeha8Q7lx5nQxRfs8PB5PmhguEGDFefL6Zg9qz8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Ut6WTkkIjiOQaCyw99nAqghqx6CDWURW+RwE6CWLBvCJbkLIsnaGYuO6xkOT1hzl8Mb00pOoi7ub9uslWq9qyZ6qNjSynS7p4nPg6DyD5tDjfnV7SyYCua6zMkbfkbtgWqmHjCVKp+WedbIgpAMf/KSjLJzP0xwDjgyCn6vpTpk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Cs4Q7JZH; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=oQ0P6syO; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Cs4Q7JZH"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="oQ0P6syO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1778512921; 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: in-reply-to:in-reply-to:references:references; bh=XYpKAqWBddZNFYdvjfGx2qHtXBFJg7fbXWnk9+t0U8A=; b=Cs4Q7JZH8uqPgnNJrVI55Dk1K3iG6zMfv7L05tkQRDq9Djm6VyWhcZ61JpddAgbK8IX9bh rcGTLOx5NKSrFHw1raFtrJOjcmYGVhw/M/zND43jgKvd7R9YPEMO0xTh8x9p7PRjVdzeVI TGl+7JRUED9p3/xdfAgiDG7z0RqWYXE= Received: from mail-qt1-f200.google.com (mail-qt1-f200.google.com [209.85.160.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-548-OMeQWEy2O2mTpW-rP-YD5g-1; Mon, 11 May 2026 11:22:00 -0400 X-MC-Unique: OMeQWEy2O2mTpW-rP-YD5g-1 X-Mimecast-MFC-AGG-ID: OMeQWEy2O2mTpW-rP-YD5g_1778512919 Received: by mail-qt1-f200.google.com with SMTP id d75a77b69052e-514ae0e3ad6so44000891cf.0 for ; Mon, 11 May 2026 08:22:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1778512919; x=1779117719; darn=vger.kernel.org; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=XYpKAqWBddZNFYdvjfGx2qHtXBFJg7fbXWnk9+t0U8A=; b=oQ0P6syOa7P9aQjs9BwOpNjT/MFAlnmu0QSKTF2d+mtEQ01gUswnTCvSRWBa6lAr00 ENptrEFACNkXP49wa04FK7Q9PNNTdbmXfzlwgNxdiQKKL7hrX+kcqoFB+pbRsMg2enCj rzxLIlIeFx1GEO+g8vp0zTWxZ64O4EJR/zMT45NAYf8YKXwK19eroyGbjZp+UOmnnXwG sozPpLVhD85CuqZD4JmhFNXmBS3Tow/zJCIwx3/8fyDqc7Bskdr4Fo3kKZr6Vd3EANOJ GAV6tarVIWe5sAtgzTR85NgqhOow1mGzuYKGbFfh5djb/Dixf5IoBLA6s4uDMdVMEGCO Alsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778512919; x=1779117719; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=XYpKAqWBddZNFYdvjfGx2qHtXBFJg7fbXWnk9+t0U8A=; b=ap5YXRO/0t430lh7gw5DcKAo9aBZimoADclHLUZAbH4n7g8YfiO7NRiTzx8bmCbkgp LrVZSBQyBQe3ohPd5r84azq46/V5Ib9l749k+2PJgllCfGsfF5R3t7eoMrTIuo56Tx8a i7zbAuMoGgP46SRnDP/KGWL0Rf1GnwyTaDF8841D1H5xOXhnToBei5CXi3HMt7PE9omD XGktYW9g4ZOwt17TTtfbtx5h/SOWw+/2G4epA0XKsZLJ9uzx/MCcr0uWzOySPFqBau2q 3pKbdtTedqI3LrjemdGJ0a5NkE3OiTLGRF0CdQSSsZ7RvUQ4847C3rGG/ef2lgnwGhba smiw== X-Forwarded-Encrypted: i=1; AFNElJ+MDkjw1SbLrMH2nMU+5/Gfon4JZkxxZ44RYUSfK7f7DhwPf7BqTTzPgkrMhfsGCG1mDv9Ewg8SR/pFNfw=@vger.kernel.org X-Gm-Message-State: AOJu0YzhObx/bM8hlSKtONCdFFe7PoflzgnkoKKekC1iv3YAOYovUfvs B8tSJDQZKBnkK6+IHYpf4WmpCH9jqERr1lQMQX1t1ZNpMGVltlbctscjE0gTjBufkSzS6b9ZYai NFKk0c06GsLScYyc40x/YAJj2vpVk9Yql1CkwW7rCadZjFELF/KuLo7msE4sILpCsyg== X-Gm-Gg: Acq92OHjq7gQJSXjYwxflUm4bY+lyIdQ1chi/bos68viXOYm6QMefzRkSlp4W/ktrnr jfCxijRNA7toTWgOXSSlE0nd27EUnGmeDxFiVUY2C1tZ/pHuk/Gq/BSSCh101768/FPHvzDIyUh rPpqaXyX444E61BQl+SExl7+cCvWMstJCsE3JYueTOhbmDWsI6GoHsu69xnsJEzMsQ/VTnTOLGO vgz07/yXiG4C5yFYzTLANIb6kucYiz0VsCnVVvCeCHRkkkG/un5DEVCgFNwlmaymKbAt63KfFvI fvJbWI8FglEcTUgX+VqzjuV/D6UbIcExia0fbjqZFY/pXOPkfUicW/CZbkM4MfD19U6Wcx0F+3M M4vwAJybHVWSlZl0K19i4fyfXXKrL44YfUCTAh2v4ZX8u37NH+VHWlhB9nyRQ0O29wmQ= X-Received: by 2002:a05:622a:19a2:b0:50e:2ebc:1cc0 with SMTP id d75a77b69052e-51475b74192mr224792111cf.16.1778512919533; Mon, 11 May 2026 08:21:59 -0700 (PDT) X-Received: by 2002:a05:622a:19a2:b0:50e:2ebc:1cc0 with SMTP id d75a77b69052e-51475b74192mr224791581cf.16.1778512919063; Mon, 11 May 2026 08:21:59 -0700 (PDT) Received: from redhat.com (c-73-183-52-120.hsd1.pa.comcast.net. [73.183.52.120]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8bf3a906e25sm96450396d6.14.2026.05.11.08.21.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 08:21:58 -0700 (PDT) Date: Mon, 11 May 2026 11:21:56 -0400 From: Brian Masney To: jian.hu@amlogic.com Cc: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Jerome Brunet , Xianwei Zhao , Kevin Hilman , Martin Blumenstingl , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 06/10] clk: amlogic: PLL reset signal supports active-low configuration Message-ID: References: <20260511-b4-a9_clk-v1-0-41cb4071b7c9@amlogic.com> <20260511-b4-a9_clk-v1-6-41cb4071b7c9@amlogic.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260511-b4-a9_clk-v1-6-41cb4071b7c9@amlogic.com> User-Agent: Mutt/2.3.1 (2026-03-20) On Mon, May 11, 2026 at 08:47:28PM +0800, Jian Hu via B4 Relay wrote: > From: Jian Hu > > In the A9 design, the PLL reset signal is configured as active-low. > > Add the flag 'CLK_MESON_PLL_RST_N' to indicate that the PLL reset signal > is active-low. This flag isn't in the patch. I assume that you mean CLK_MESON_PLL_RST_ACTIVE_LOW? Brian > > Signed-off-by: Jian Hu > --- > drivers/clk/meson/clk-pll.c | 42 +++++++++++++++++++++++++++++++----------- > drivers/clk/meson/clk-pll.h | 2 ++ > 2 files changed, 33 insertions(+), 11 deletions(-) > > diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c > index 5a0bd75f85a9..8568ad6ba7b6 100644 > --- a/drivers/clk/meson/clk-pll.c > +++ b/drivers/clk/meson/clk-pll.c > @@ -295,10 +295,14 @@ static int meson_clk_pll_is_enabled(struct clk_hw *hw) > { > struct clk_regmap *clk = to_clk_regmap(hw); > struct meson_clk_pll_data *pll = meson_clk_pll_data(clk); > + unsigned int rst; > > - if (MESON_PARM_APPLICABLE(&pll->rst) && > - meson_parm_read(clk->map, &pll->rst)) > - return 0; > + if (MESON_PARM_APPLICABLE(&pll->rst)) { > + rst = meson_parm_read(clk->map, &pll->rst); > + if ((rst && !(pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW)) || > + (!rst && (pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW))) > + return 0; > + } > > if (!meson_parm_read(clk->map, &pll->en) || > !meson_parm_read(clk->map, &pll->l)) > @@ -326,14 +330,22 @@ static int meson_clk_pll_init(struct clk_hw *hw) > return 0; > > if (pll->init_count) { > - if (MESON_PARM_APPLICABLE(&pll->rst)) > - meson_parm_write(clk->map, &pll->rst, 1); > + if (MESON_PARM_APPLICABLE(&pll->rst)) { > + if (pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW) > + meson_parm_write(clk->map, &pll->rst, 0); > + else > + meson_parm_write(clk->map, &pll->rst, 1); > + } > > regmap_multi_reg_write(clk->map, pll->init_regs, > pll->init_count); > > - if (MESON_PARM_APPLICABLE(&pll->rst)) > - meson_parm_write(clk->map, &pll->rst, 0); > + if (MESON_PARM_APPLICABLE(&pll->rst)) { > + if (pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW) > + meson_parm_write(clk->map, &pll->rst, 1); > + else > + meson_parm_write(clk->map, &pll->rst, 0); > + } > } > > return 0; > @@ -363,15 +375,23 @@ static int meson_clk_pll_enable(struct clk_hw *hw) > return 0; > > /* Make sure the pll is in reset */ > - if (MESON_PARM_APPLICABLE(&pll->rst)) > - meson_parm_write(clk->map, &pll->rst, 1); > + if (MESON_PARM_APPLICABLE(&pll->rst)) { > + if (pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW) > + meson_parm_write(clk->map, &pll->rst, 0); > + else > + meson_parm_write(clk->map, &pll->rst, 1); > + } > > /* Enable the pll */ > meson_parm_write(clk->map, &pll->en, 1); > > /* Take the pll out reset */ > - if (MESON_PARM_APPLICABLE(&pll->rst)) > - meson_parm_write(clk->map, &pll->rst, 0); > + if (MESON_PARM_APPLICABLE(&pll->rst)) { > + if (pll->flags & CLK_MESON_PLL_RST_ACTIVE_LOW) > + meson_parm_write(clk->map, &pll->rst, 1); > + else > + meson_parm_write(clk->map, &pll->rst, 0); > + } > > /* > * Compared with the previous SoCs, self-adaption current module > diff --git a/drivers/clk/meson/clk-pll.h b/drivers/clk/meson/clk-pll.h > index 97b7c70376a3..1be7e6e77631 100644 > --- a/drivers/clk/meson/clk-pll.h > +++ b/drivers/clk/meson/clk-pll.h > @@ -31,6 +31,8 @@ struct pll_mult_range { > #define CLK_MESON_PLL_NOINIT_ENABLED BIT(1) > /* l_detect signal is active-high */ > #define CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH BIT(2) > +/* rst signal is active-low (Power-on reset) */ > +#define CLK_MESON_PLL_RST_ACTIVE_LOW BIT(3) > > struct meson_clk_pll_data { > struct parm en; > > -- > 2.47.1 > >