From patchwork Thu Dec 19 11:23:49 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tero Kristo X-Patchwork-Id: 3376961 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D6F3AC0D4A for ; Thu, 19 Dec 2013 11:26:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8EE8E20620 for ; Thu, 19 Dec 2013 11:26:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A865920619 for ; Thu, 19 Dec 2013 11:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753550Ab3LSLZ6 (ORCPT ); Thu, 19 Dec 2013 06:25:58 -0500 Received: from arroyo.ext.ti.com ([192.94.94.40]:42482 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753534Ab3LSLZz (ORCPT ); Thu, 19 Dec 2013 06:25:55 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id rBJBPW5R005232; Thu, 19 Dec 2013 05:25:32 -0600 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id rBJBPWOo029865; Thu, 19 Dec 2013 05:25:32 -0600 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.2.342.3; Thu, 19 Dec 2013 05:25:31 -0600 Received: from localhost.localdomain (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id rBJBOUhC009888; Thu, 19 Dec 2013 05:25:29 -0600 From: Tero Kristo To: , , , , , , CC: , Subject: [PATCHv11 18/49] CLK: TI: add support for clockdomain binding Date: Thu, 19 Dec 2013 13:23:49 +0200 Message-ID: <1387452260-23276-19-git-send-email-t-kristo@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1387452260-23276-1-git-send-email-t-kristo@ti.com> References: <1387452260-23276-1-git-send-email-t-kristo@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some OMAP clocks require knowledge about their parent clockdomain for book keeping purposes. This patch creates a new DT binding for TI clockdomains, which act as a collection of device clocks. Signed-off-by: Tero Kristo --- .../devicetree/bindings/clock/ti/clockdomain.txt | 24 +++++++ drivers/clk/ti/Makefile | 3 +- drivers/clk/ti/clockdomain.c | 70 ++++++++++++++++++++ include/linux/clk/ti.h | 1 + 4 files changed, 97 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/clock/ti/clockdomain.txt create mode 100644 drivers/clk/ti/clockdomain.c diff --git a/Documentation/devicetree/bindings/clock/ti/clockdomain.txt b/Documentation/devicetree/bindings/clock/ti/clockdomain.txt new file mode 100644 index 0000000..cb76b3f --- /dev/null +++ b/Documentation/devicetree/bindings/clock/ti/clockdomain.txt @@ -0,0 +1,24 @@ +Binding for Texas Instruments clockdomain. + +Binding status: Unstable - ABI compatibility may be broken in the future + +This binding uses the common clock binding[1] in consumer role. +Every clock on TI SoC belongs to one clockdomain, but software +only needs this information for specific clocks which require +their parent clockdomain to be controlled when the clock is +enabled/disabled. This binding doesn't define a new clock +binding type, it is used to group existing clock nodes under +hardware hierarchy. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt + +Required properties: +- compatible : shall be "ti,clockdomain" +- #clock-cells : from common clock binding; shall be set to 0. +- clocks : link phandles of clocks within this domain + +Examples: + dss_clkdm: dss_clkdm { + compatible = "ti,clockdomain"; + clocks = <&dss1_alwon_fck_3430es2>, <&dss_ick_3430es2>; + }; diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile index 7cba389..67056fb 100644 --- a/drivers/clk/ti/Makefile +++ b/drivers/clk/ti/Makefile @@ -1,4 +1,5 @@ ifneq ($(CONFIG_OF),) obj-y += clk.o dpll.o autoidle.o divider.o \ - fixed-factor.o gate.o composite.o + fixed-factor.o gate.o clockdomain.o \ + composite.o endif diff --git a/drivers/clk/ti/clockdomain.c b/drivers/clk/ti/clockdomain.c new file mode 100644 index 0000000..f1e0038 --- /dev/null +++ b/drivers/clk/ti/clockdomain.c @@ -0,0 +1,70 @@ +/* + * OMAP clockdomain support + * + * Copyright (C) 2013 Texas Instruments, Inc. + * + * Tero Kristo + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#undef pr_fmt +#define pr_fmt(fmt) "%s: " fmt, __func__ + +static void __init of_ti_clockdomain_setup(struct device_node *node) +{ + struct clk *clk; + struct clk_hw *clk_hw; + const char *clkdm_name = node->name; + int i; + int num_clks; + + num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells"); + + for (i = 0; i < num_clks; i++) { + clk = of_clk_get(node, i); + if (__clk_get_flags(clk) & CLK_IS_BASIC) { + pr_warn("can't setup clkdm for basic clk %s\n", + __clk_get_name(clk)); + continue; + } + clk_hw = __clk_get_hw(clk); + to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name; + omap2_init_clk_clkdm(clk_hw); + } +} + +static struct of_device_id ti_clkdm_match_table[] __initdata = { + { .compatible = "ti,clockdomain" }, + { } +}; + +/** + * ti_dt_clockdomains_setup - setup device tree clockdomains + * + * Initializes clockdomain nodes for a SoC. This parses through all the + * nodes with compatible = "ti,clockdomain", and add the clockdomain + * info for all the clocks listed under these. This function shall be + * called after rest of the DT clock init has completed and all + * clock nodes have been registered. + */ +void __init ti_dt_clockdomains_setup(void) +{ + struct device_node *np; + for_each_matching_node(np, ti_clkdm_match_table) { + of_ti_clockdomain_setup(np); + } +} diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h index a52495d..e8c1b22 100644 --- a/include/linux/clk/ti.h +++ b/include/linux/clk/ti.h @@ -238,6 +238,7 @@ int omap2_dflt_clk_is_enabled(struct clk_hw *hw); void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index); void ti_dt_clocks_register(struct ti_dt_clk *oclks); void ti_dt_clk_init_provider(struct device_node *np, int index); +void ti_dt_clockdomains_setup(void); void ti_clk_retry_init(struct device_node *node, struct clk_hw *hw, ti_of_clk_init_cb_t func); int of_ti_clk_autoidle_setup(struct device_node *node);