From patchwork Wed Apr 29 21:53:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11518665 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 46CA31392 for ; Wed, 29 Apr 2020 21:55:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 398D32137B for ; Wed, 29 Apr 2020 21:55:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727780AbgD2VyL (ORCPT ); Wed, 29 Apr 2020 17:54:11 -0400 Received: from muru.com ([72.249.23.125]:51782 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726511AbgD2VyK (ORCPT ); Wed, 29 Apr 2020 17:54:10 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id E37B2819C; Wed, 29 Apr 2020 21:54:55 +0000 (UTC) From: Tony Lindgren To: Daniel Lezcano , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Keerthy , Lokesh Vutla , Tero Kristo , "H. Nikolaus Schaller" , Aaro Koskinen , Adam Ford , Andreas Kemnade , Brian Hutchinson , Graeme Smecher , Michael Turquette , Stephen Boyd , devicetree@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH 01/15] clocksource/drivers/timer-ti-32k: Add support for initializing directly Date: Wed, 29 Apr 2020 14:53:48 -0700 Message-Id: <20200429215402.18125-2-tony@atomide.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200429215402.18125-1-tony@atomide.com> References: <20200429215402.18125-1-tony@atomide.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Let's allow probing the 32k counter directly based on devicetree data to prepare for dropping the related legacy platform code. Let's only do this if the parent node is compatible with ti-sysc to make sure we have the related devicetree data available. Let's also show the 32k counter information before registering the clocksource, now we see it after the clocksource information which is a bit confusing. Cc: linux-kernel@vger.kernel.org Cc: linux-omap@vger.kernel.org Cc: Daniel Lezcano Cc: Keerthy Cc: Lokesh Vutla Cc: Tero Kristo Cc: Thomas Gleixner Signed-off-by: Tony Lindgren --- drivers/clocksource/timer-ti-32k.c | 48 +++++++++++++++++++++++++++++- 1 file changed, 47 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c --- a/drivers/clocksource/timer-ti-32k.c +++ b/drivers/clocksource/timer-ti-32k.c @@ -24,6 +24,7 @@ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com */ +#include #include #include #include @@ -76,6 +77,49 @@ static u64 notrace omap_32k_read_sched_clock(void) return ti_32k_read_cycles(&ti_32k_timer.cs); } +static void __init ti_32k_timer_enable_clock(struct device_node *np, + const char *name) +{ + struct clk *clock; + int error; + + clock = of_clk_get_by_name(np->parent, name); + if (IS_ERR(clock)) { + /* Only some SoCs have a separate interface clock */ + if (PTR_ERR(clock) == -EINVAL && !strncmp("ick", name, 3)) + return; + + pr_warn("%s: could not get clock %s %li\n", + __func__, name, PTR_ERR(clock)); + return; + } + + error = clk_prepare_enable(clock); + if (error) { + pr_warn("%s: could not enable %s: %i\n", + __func__, name, error); + return; + } +} + +static void __init ti_32k_timer_module_init(struct device_node *np, + void __iomem *base) +{ + void __iomem *sysc = base + 4; + + if (!of_device_is_compatible(np->parent, "ti,sysc")) + return; + + ti_32k_timer_enable_clock(np, "fck"); + ti_32k_timer_enable_clock(np, "ick"); + + /* + * Force idle module as wkup domain is active with MPU. + * No need to tag the module disabled for ti-sysc probe. + */ + writel_relaxed(0, sysc); +} + static int __init ti_32k_timer_init(struct device_node *np) { int ret; @@ -90,6 +134,7 @@ static int __init ti_32k_timer_init(struct device_node *np) ti_32k_timer.cs.flags |= CLOCK_SOURCE_SUSPEND_NONSTOP; ti_32k_timer.counter = ti_32k_timer.base; + ti_32k_timer_module_init(np, ti_32k_timer.base); /* * 32k sync Counter IP register offsets vary between the highlander @@ -104,6 +149,8 @@ static int __init ti_32k_timer_init(struct device_node *np) else ti_32k_timer.counter += OMAP2_32KSYNCNT_CR_OFF_LOW; + pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); + ret = clocksource_register_hz(&ti_32k_timer.cs, 32768); if (ret) { pr_err("32k_counter: can't register clocksource\n"); @@ -111,7 +158,6 @@ static int __init ti_32k_timer_init(struct device_node *np) } sched_clock_register(omap_32k_read_sched_clock, 32, 32768); - pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); return 0; }