From patchwork Wed Aug 28 06:59:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tero Kristo X-Patchwork-Id: 11117901 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D25F51399 for ; Wed, 28 Aug 2019 06:59:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B1FA52080F for ; Wed, 28 Aug 2019 06:59:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="aiKB1b+h" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726394AbfH1G7p (ORCPT ); Wed, 28 Aug 2019 02:59:45 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:58044 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726340AbfH1G7p (ORCPT ); Wed, 28 Aug 2019 02:59:45 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x7S6xgRN120632; Wed, 28 Aug 2019 01:59:42 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1566975582; bh=+qrcnaR3a/pZ4OviE1ZKc8IWLJlt6Yebqe6i5IEbb64=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=aiKB1b+hoLadlo/Pbo47IaGcDNhCLTUj+VEmgIzMSnjuOXWKixxAa+sFlElu5LM4y +ElQHLaAaPyNUPSHIFm088xr3aCa1aItjDfIfjP7R8GUjLKJAqKr7517G4fmYtgrBP 43MkSf0QTnTzJ/vaK6sN8xCkOobiz+piraLdytQg= Received: from DFLE108.ent.ti.com (dfle108.ent.ti.com [10.64.6.29]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x7S6xg2J056136 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 28 Aug 2019 01:59:42 -0500 Received: from DFLE104.ent.ti.com (10.64.6.25) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 28 Aug 2019 01:59:41 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE104.ent.ti.com (10.64.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 28 Aug 2019 01:59:40 -0500 Received: from sokoban.bb.dnainternet.fi (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x7S6xXVD074399; Wed, 28 Aug 2019 01:59:39 -0500 From: Tero Kristo To: , , CC: , , Subject: [PATCHv2 3/6] clk: ti: clkctrl: add new exported API for checking standby info Date: Wed, 28 Aug 2019 09:59:26 +0300 Message-ID: <20190828065929.32150-4-t-kristo@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190828065929.32150-1-t-kristo@ti.com> References: <20190828065929.32150-1-t-kristo@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Standby status is provided for certain clkctrl clocks to see if the given module has entered standby or not. This is mostly needed by remoteproc code to see if the remoteproc has entered standby and the clock can be turned off safely. Signed-off-by: Tero Kristo --- drivers/clk/ti/clkctrl.c | 33 +++++++++++++++++++++++++++++++++ include/linux/clk/ti.h | 1 + 2 files changed, 34 insertions(+) diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c index d904a9a7626a..e3e0a66a6ce2 100644 --- a/drivers/clk/ti/clkctrl.c +++ b/drivers/clk/ti/clkctrl.c @@ -34,6 +34,9 @@ #define OMAP4_IDLEST_MASK (0x3 << 16) #define OMAP4_IDLEST_SHIFT 16 +#define OMAP4_STBYST_MASK BIT(18) +#define OMAP4_STBYST_SHIFT 18 + #define CLKCTRL_IDLEST_FUNCTIONAL 0x0 #define CLKCTRL_IDLEST_INTERFACE_IDLE 0x2 #define CLKCTRL_IDLEST_DISABLED 0x3 @@ -647,3 +650,33 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node) } CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl", _ti_omap4_clkctrl_setup); + +/** + * ti_clk_is_in_standby - Check if clkctrl clock is in standby or not + * @clk: clock to check standby status for + * + * Finds whether the provided clock is in standby mode or not. Returns + * true if the provided clock is a clkctrl type clock and it is in standby, + * false otherwise. + */ +u32 ti_clk_is_in_standby(struct clk *clk) +{ + struct clk_hw *hw; + struct clk_hw_omap *hwclk; + u32 val; + + hw = __clk_get_hw(clk); + + if (!omap2_clk_is_hw_omap(hw)) + return false; + + hwclk = to_clk_hw_omap(hw); + + val = ti_clk_ll_ops->clk_readl(&hwclk->enable_reg); + + if (val & OMAP4_STBYST_MASK) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(ti_clk_is_in_standby); diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h index bb2c5af9082a..3fb777f7103a 100644 --- a/include/linux/clk/ti.h +++ b/include/linux/clk/ti.h @@ -298,6 +298,7 @@ struct ti_clk_features { void ti_clk_setup_features(struct ti_clk_features *features); const struct ti_clk_features *ti_clk_get_features(void); +u32 ti_clk_is_in_standby(struct clk *clk); int omap3_noncore_dpll_save_context(struct clk_hw *hw); void omap3_noncore_dpll_restore_context(struct clk_hw *hw);