From patchwork Mon Jul 29 07:07:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varshini Rajendran X-Patchwork-Id: 13744444 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 5418DC3DA4A for ; Mon, 29 Jul 2024 07:12:34 +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:To:From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rAyyKW5c5d1JcFh6v1C6UadyxaZ6sAVNc/rfigBxyU0=; b=4ooqvqB5M15Lhc1cuy9P+zghgy 6bIiFUL+uTccp+EQke+5OY9nWZsDANM/GxZlDoIbGjBALRsFHZZ/tHMu0NkVk8oOa2cq4yidrBf8o OmMR3SMpI7X+szd7nFL18Qd8zKUaK1RQlWn0ZG6p6zbX5u2N+8JF5+gmekCDJq2HKXanHZb3UbWxa e8WrYqUF0OSxAuOyOhKjQjriEAFqRvrVX/AVELsFsElDWzmk8rVYrkQ33LNqO4N7551nxcm2mydbv ErsiRE6eXlSBK8G80iiD855+NSetOIDG4yBxtcx1SuJ1pBd+9K4lE8azQ8iExE71zwtqEb+Cj9lc2 s48GCPBw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYKYR-0000000AI5i-2XjU; Mon, 29 Jul 2024 07:12:23 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYKUd-0000000AGdh-3d73 for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 07:08:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1722236907; x=1753772907; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=Di2ZGDrA79I1MXXqZzapDThApEyoad0ZpQCNWRq3Atk=; b=imAOOaKNbjH5x6PCXFXA20lSPTNabqRjkZA/f7Fi0WaLNc12QSc64fEz XBJqzv6peDqQHVpXEr7o7j4LbGwLVS4JzpbRHJGu095odFKkILxmnXMcy MEDW8SzOC2u1aUu9EwKldXoGB57vGT3mE4nJH+R/Og9OiZOK55+CDBbRL 0GW8kYKkZtx3dLoP1i7q6ASCe5tGpLA9BUOR23jP+R4ojnP6DEvcCt+mc 2qX9zK+F82ew+VM1WS4V4ZqGVXKqtI6rFW/FIU00aovRrs7VQQ/iknnxw iIa/AGktGDsviA4eBETeoSnCyB873GWut6aRktmTPxgUZrgNSznM5u3gY w==; X-CSE-ConnectionGUID: CDCB7FyvSBaPa6/JesHbIg== X-CSE-MsgGUID: UG8SIdJFTn6LGmjOGUGT7w== X-IronPort-AV: E=Sophos;i="6.09,245,1716274800"; d="scan'208";a="32596908" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa1.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 29 Jul 2024 00:08:27 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) 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 15.1.2507.35; Mon, 29 Jul 2024 00:07:52 -0700 Received: from che-lt-i67070.microchip.com (10.10.85.11) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Mon, 29 Jul 2024 00:07:49 -0700 From: Varshini Rajendran To: , , , , , , , , Subject: [PATCH v6 12/27] clk: at91: sam9x7: add support for HW PLL freq dividers Date: Mon, 29 Jul 2024 12:37:46 +0530 Message-ID: <20240729070746.1990805-1-varshini.rajendran@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240729065603.1986074-1-varshini.rajendran@microchip.com> References: <20240729065603.1986074-1-varshini.rajendran@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240729_000828_087954_E527FAF4 X-CRM114-Status: GOOD ( 16.80 ) 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 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 be 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 Reviewed-by: Claudiu Beznea --- Changes in v6: - Updated Reviewed-by tag --- drivers/clk/at91/clk-sam9x60-pll.c | 30 ++++++++++++++++++++++++++++-- drivers/clk/at91/pmc.h | 1 + 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c index b0314dfd7393..fda041102224 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, @@ -725,10 +747,14 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, else init.parent_names = &parent_name; init.num_parents = 1; - if (flags & CLK_SET_RATE_GATE) + + 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 bb9da35198d9..91d1c6305d95 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;