From patchwork Fri Jul 28 10:29:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varshini Rajendran X-Patchwork-Id: 13331679 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 EB67AC0015E for ; Fri, 28 Jul 2023 10:30:21 +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:MIME-Version: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:In-Reply-To:References: List-Owner; bh=XpiE7FpgYPGPMB+AxaBcmo6Ef/6F9CntNLsncHxsR88=; b=nql+Yx4mLey15z 8TvQHrusO+PY3l7/qD5QVnrmyWDAYDSFNxqHPQqK7+7btq/d85AxxEiUJq83WoyYp4rn/F+wEb7PD wGT5Yka1xlh3ZYgQlcr7+lK0J1QaHx4CgaKnvtTMC4vuQTNnwY1Raez5f0PdA3MelryB6nix8GCTK suL13cbGQQdwSQomVcObdYOZ7lFwCFmsDIqkxYbsov7UzkNHf7a3gyw1JWPaXF6ptQdAU2uzZvUgN vUP+Oq4zjDJwGhuSPJBT5CGOieU2j3g4WtXMHH0eaSs1P53unJ4Cp9YIB6lx1NGpjxhrVak9BOjzR qi9hdashR2IZWb2pSRLQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qPKjM-002xnz-07; Fri, 28 Jul 2023 10:29:56 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qPKjA-002xk0-1y for linux-arm-kernel@lists.infradead.org; Fri, 28 Jul 2023 10:29:48 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1690540184; x=1722076184; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=+9RuzNpYmHyqf7fIjBX42rka1JAIk57K6KkiNE8I2wU=; b=SAa9NmWCsD8bBtXchbkvocJHyHF4BQf137++8RY3aKuXwagVFN8t0xay KBk//+dk4t0cI4cWKyQ0AqvHGo3kH5WWYBqiHCbDJ/2/+O+ZTSc4wPteH b2pZv7yDvJT0+driVbK0ZGRYSS5uLxFUgCaONAuaUTJZthtMCL+lk5Feq 5THgaquH6re89d13qIcChUcqr7hQTyWw47hSGmgE/v+n4C9MxkjT33RAd gwb0/9nuZopmNM9U+H+6HHod2d7UvCcVPhyheZbGCYhbGUQPKp0uTjr9C oW8sKLaazs4U0vEXOp+L683BYpp3GJ66nOkmi4Wt0zZF/Qal6g8BB4tP/ Q==; X-IronPort-AV: E=Sophos;i="6.01,237,1684825200"; d="scan'208";a="225813731" 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; 28 Jul 2023 03:29:44 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Fri, 28 Jul 2023 03:29:34 -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, 28 Jul 2023 03:29:30 -0700 From: Varshini Rajendran To: , , , , , , , , , Subject: [PATCH v3 38/50] clk: at91: sam9x7: add support for HW PLL freq dividers Date: Fri, 28 Jul 2023 15:59:28 +0530 Message-ID: <20230728102928.267237-1-varshini.rajendran@microchip.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230728_032944_656111_FCFC804E X-CRM114-Status: GOOD ( 16.73 ) 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 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 b0314dfd7393..1f80759309c0 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 +747,16 @@ 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) - 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 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;