From patchwork Fri Jun 23 20:30:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varshini Rajendran X-Patchwork-Id: 696567 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 A91DBEB64D7 for ; Mon, 26 Jun 2023 11:22:31 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 6DBB87F8; Mon, 26 Jun 2023 13:21:39 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 6DBB87F8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1687778549; bh=H6+qeb5lhbTKb0rFTMW89wX0Vd03nImzkY3g4+gHCu0=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=hbEo2L+3fBHCmIiVLCwz5WYuLWkSoEea1nA5kjKoVJ+xKPpyn+7oltWDkV/up63Ks M4LbzzZBubpPQUrlAyBmX7OYDeP3uQ6isHaenKdqNXCdkJj1RdOulJmw0A7SPd/lRX JJ1OVvj55LA4yASGLx8dRASvmxL6ZcydaQHUWF94= Received: by alsa1.perex.cz (Postfix, from userid 50401) id 0D428F8056F; Mon, 26 Jun 2023 13:20:34 +0200 (CEST) Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 865DFF80571; Mon, 26 Jun 2023 13:20:33 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 4E3F0F80141; Fri, 23 Jun 2023 22:36:09 +0200 (CEST) Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 0398EF80130 for ; Fri, 23 Jun 2023 22:36:04 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 0398EF80130 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key, unprotected) header.d=microchip.com header.i=@microchip.com header.a=rsa-sha256 header.s=mchp header.b=1+84Y0vM DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1687552566; x=1719088566; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=H6+qeb5lhbTKb0rFTMW89wX0Vd03nImzkY3g4+gHCu0=; b=1+84Y0vMmvmxG3WOhxtGhjVpYyoLQ8al5F+9NoAkb8UrhFr6lm1CMs0b MqprclxZAFgash4BYVKSMML0oWmjjqa/QZuTEh5ohpqMF8jPfAauMHgVv t13Rfb8PHgc0//3sDk9EjekIngByTjfANvmKCMeYQ3WP2wAZuNFBmhJ6T BMuVOZb1UHYw/YBgnN3/i6SYGoD/32Gw3NsuYnoSbNmW2oSHmbNe7tgwu Zoucs44KMJIUEGPUs4jv+Kdsqe0JGPjiAuk28whVZJBQ/TLDMzQEm63NH Hswym00KytXVsUSeMc1VshqyBWc2oxqSaAKarvBKAVbCz4zUDhwFf05FE Q==; X-IronPort-AV: E=Sophos;i="6.01,153,1684825200"; d="scan'208";a="219550360" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 23 Jun 2023 13:36:01 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Fri, 23 Jun 2023 13:35:53 -0700 Received: from che-lt-i67070.amer.actel.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2507.21 via Frontend Transport; Fri, 23 Jun 2023 13:35:25 -0700 From: Varshini Rajendran To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 09/45] clk: at91: sam9x7: add support for HW PLL freq dividers Date: Sat, 24 Jun 2023 02:00:20 +0530 Message-ID: <20230623203056.689705-10-varshini.rajendran@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230623203056.689705-1-varshini.rajendran@microchip.com> References: <20230623203056.689705-1-varshini.rajendran@microchip.com> MIME-Version: 1.0 X-MailFrom: Varshini.Rajendran@microchip.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1 Message-ID-Hash: UAWN7N2TPEIG5SUIB5RDQ3WXYY4EBXUW X-Message-ID-Hash: UAWN7N2TPEIG5SUIB5RDQ3WXYY4EBXUW X-Mailman-Approved-At: Mon, 26 Jun 2023 11:20:26 +0000 X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Add support for hardware dividers for PLL IDs in sam9x7 SoC. The system PLL - PLLA and the system PLL divided by 2 - PLLADIV2 with PLL ID 0 and 4 respectively, both have a hardware divider /2. This has to taken into account in the software to obtain the right frequencies. Support for the same is added in the PLL driver. fcorepllack -----> HW Div = 2 -+--> fpllack | +--> HW Div = 2 ---> fplladiv2ck In this case the corepll freq is 1600 MHz. So, the plla freq is 800 MHz after the hardware divider and the plladiv2 freq is 400 MHz after the hardware divider (Given that the DIVPMC is 0). Signed-off-by: Varshini Rajendran --- drivers/clk/at91/clk-sam9x60-pll.c | 38 ++++++++++++++++++++++++++---- drivers/clk/at91/pmc.h | 1 + 2 files changed, 34 insertions(+), 5 deletions(-) diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c index b3012641214c..76273ea74f8b 100644 --- a/drivers/clk/at91/clk-sam9x60-pll.c +++ b/drivers/clk/at91/clk-sam9x60-pll.c @@ -73,9 +73,15 @@ static unsigned long sam9x60_frac_pll_recalc_rate(struct clk_hw *hw, { struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); struct sam9x60_frac *frac = to_sam9x60_frac(core); + unsigned long freq; - return parent_rate * (frac->mul + 1) + + freq = parent_rate * (frac->mul + 1) + DIV_ROUND_CLOSEST_ULL((u64)parent_rate * frac->frac, (1 << 22)); + + if (core->layout->div2) + freq >>= 1; + + return freq; } static int sam9x60_frac_pll_set(struct sam9x60_pll_core *core) @@ -432,6 +438,12 @@ static unsigned long sam9x60_div_pll_recalc_rate(struct clk_hw *hw, return DIV_ROUND_CLOSEST_ULL(parent_rate, (div->div + 1)); } +static unsigned long sam9x60_fixed_div_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return parent_rate >> 1; +} + static long sam9x60_div_pll_compute_div(struct sam9x60_pll_core *core, unsigned long *parent_rate, unsigned long rate) @@ -606,6 +618,16 @@ static const struct clk_ops sam9x60_div_pll_ops_chg = { .restore_context = sam9x60_div_pll_restore_context, }; +static const struct clk_ops sam9x60_fixed_div_pll_ops = { + .prepare = sam9x60_div_pll_prepare, + .unprepare = sam9x60_div_pll_unprepare, + .is_prepared = sam9x60_div_pll_is_prepared, + .recalc_rate = sam9x60_fixed_div_pll_recalc_rate, + .round_rate = sam9x60_div_pll_round_rate, + .save_context = sam9x60_div_pll_save_context, + .restore_context = sam9x60_div_pll_restore_context, +}; + struct clk_hw * __init sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, @@ -718,10 +740,16 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, init.name = name; init.parent_names = &parent_name; init.num_parents = 1; - if (flags & CLK_SET_RATE_GATE) - init.ops = &sam9x60_div_pll_ops; - else - init.ops = &sam9x60_div_pll_ops_chg; + + if (layout->div2) { + init.ops = &sam9x60_fixed_div_pll_ops; + } else { + if (flags & CLK_SET_RATE_GATE) + init.ops = &sam9x60_div_pll_ops; + else + init.ops = &sam9x60_div_pll_ops_chg; + } + init.flags = flags; div->core.id = id; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 3e36dcc464c1..1dd01f30bdee 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -64,6 +64,7 @@ struct clk_pll_layout { u8 frac_shift; u8 div_shift; u8 endiv_shift; + u8 div2; }; extern const struct clk_pll_layout at91rm9200_pll_layout;