From patchwork Thu Apr 18 15:55:10 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Fuzzey X-Patchwork-Id: 237678 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:770:15f::2]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id C2AFB2C0203 for ; Fri, 19 Apr 2013 01:55:28 +1000 (EST) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1USrBC-0001Wc-1r; Thu, 18 Apr 2013 15:55:22 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1USrB9-0002OK-ID; Thu, 18 Apr 2013 15:55:19 +0000 Received: from mta1.parkeon.com ([91.121.43.66]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1USrB4-0002Nz-Jv for linux-arm-kernel@lists.infradead.org; Thu, 18 Apr 2013 15:55:15 +0000 Received: from ip71.parkeon.com ([213.152.31.71] helo=mta2.parkeon.com) by mta1.parkeon.com with esmtp (Exim 4.76) (envelope-from ) id 1USrB1-0006as-2V; Thu, 18 Apr 2013 17:55:11 +0200 Received: from [10.32.16.23] (helo=mail.besancon.parkeon.com) by mta2.parkeon.com with esmtp (Exim 4.77) (envelope-from ) id 1USrAx-00080y-V8; Thu, 18 Apr 2013 17:55:07 +0200 Received: from [10.32.51.221] (port=40345 helo=[127.0.0.1]) by mail.besancon.parkeon.com with esmtp (Exim 4.71) (envelope-from ) id 1USrB0-0002HS-SS; Thu, 18 Apr 2013 17:55:10 +0200 Subject: [PATCH V3] ARM: i.MX5: Allow DT clock providers To: Sascha Hauer , Shawn Guao , linux-arm-kernel@lists.infradead.org From: Martin Fuzzey Date: Thu, 18 Apr 2013 17:55:10 +0200 Message-ID: <20130418155510.26908.61334.stgit@localhost> User-Agent: StGit/0.16 MIME-Version: 1.0 X-Virus-Scanned: by ClamAV at mta2.parkeon.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130418_115514_776455_FAC50ED4 X-CRM114-Status: GOOD ( 12.83 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org Currently clock providers defined in the DT are not registered on i.MX5 platforms since of_clk_init() is not called. This is not a problem for the SOC's own clocks, which are registered in code, but prevents the DT being used to define clocks for external hardware. Fix this by calling of_clk_init() and actually using the DT to obtain the 4 SOC fixed clocks. These are already defined in the DT but were previously just used to manually obtain the rate. Fall back to the old scheme for non DT platforms. Signed-off-by: Martin Fuzzey Tested-by: Fabio Estevam --- Changelog: V2: Applied comments from Sascha Hauer: * Use kasprintf instead of scnprintf to avoid length limit * Avoid use of IS_ERR_OR_NULL V3: Applied comments from Shawn Guo: * Find clocks by path rather than compatible string * Remove unnecessary #ifdef CONFIG_OF --- arch/arm/mach-imx/clk-imx51-imx53.c | 76 ++++++++++++++++++----------------- 1 files changed, 40 insertions(+), 36 deletions(-) diff --git a/arch/arm/mach-imx/clk-imx51-imx53.c b/arch/arm/mach-imx/clk-imx51-imx53.c index 3228b4e..606c679 100644 --- a/arch/arm/mach-imx/clk-imx51-imx53.c +++ b/arch/arm/mach-imx/clk-imx51-imx53.c @@ -117,17 +117,51 @@ enum imx5_clks { static struct clk *clk[clk_max]; static struct clk_onecell_data clk_data; + +static struct clk * __init mx5_obtain_fixed_clock_from_dt(const char *name) +{ + struct of_phandle_args phandle = {0}; + struct clk *clk = ERR_PTR(-ENODEV); + char *path; + + path = kasprintf(GFP_KERNEL, "/clocks/%s", name); + if (!path) + return ERR_PTR(-ENOMEM); + + phandle.np = of_find_node_by_path(path); + kfree(path); + + if (phandle.np) { + clk = of_clk_get_from_provider(&phandle); + of_node_put(phandle.np); + } + return clk; +} + +static struct clk * __init mx5_obtain_fixed_clock( + const char *name, unsigned long rate) +{ + struct clk *clk; + + clk = mx5_obtain_fixed_clock_from_dt(name); + if (IS_ERR(clk)) + clk = imx_clk_fixed(name, rate); + return clk; +} + static void __init mx5_clocks_common_init(unsigned long rate_ckil, unsigned long rate_osc, unsigned long rate_ckih1, unsigned long rate_ckih2) { int i; + of_clk_init(NULL); + clk[dummy] = imx_clk_fixed("dummy", 0); - clk[ckil] = imx_clk_fixed("ckil", rate_ckil); - clk[osc] = imx_clk_fixed("osc", rate_osc); - clk[ckih1] = imx_clk_fixed("ckih1", rate_ckih1); - clk[ckih2] = imx_clk_fixed("ckih2", rate_ckih2); + clk[ckil] = mx5_obtain_fixed_clock("ckil", rate_ckil); + clk[osc] = mx5_obtain_fixed_clock("osc", rate_osc); + clk[ckih1] = mx5_obtain_fixed_clock("ckih1", rate_ckih1); + clk[ckih2] = mx5_obtain_fixed_clock("ckih2", rate_ckih2); clk[lp_apm] = imx_clk_mux("lp_apm", MXC_CCM_CCSR, 9, 1, lp_apm_sel, ARRAY_SIZE(lp_apm_sel)); @@ -539,42 +573,12 @@ int __init mx53_clocks_init(unsigned long rate_ckil, unsigned long rate_osc, return of_clk_configure(); } -#ifdef CONFIG_OF -static void __init clk_get_freq_dt(unsigned long *ckil, unsigned long *osc, - unsigned long *ckih1, unsigned long *ckih2) -{ - struct device_node *np; - - /* retrieve the freqency of fixed clocks from device tree */ - for_each_compatible_node(np, NULL, "fixed-clock") { - u32 rate; - if (of_property_read_u32(np, "clock-frequency", &rate)) - continue; - - if (of_device_is_compatible(np, "fsl,imx-ckil")) - *ckil = rate; - else if (of_device_is_compatible(np, "fsl,imx-osc")) - *osc = rate; - else if (of_device_is_compatible(np, "fsl,imx-ckih1")) - *ckih1 = rate; - else if (of_device_is_compatible(np, "fsl,imx-ckih2")) - *ckih2 = rate; - } -} - int __init mx51_clocks_init_dt(void) { - unsigned long ckil, osc, ckih1, ckih2; - - clk_get_freq_dt(&ckil, &osc, &ckih1, &ckih2); - return mx51_clocks_init(ckil, osc, ckih1, ckih2); + return mx51_clocks_init(0, 0, 0, 0); } int __init mx53_clocks_init_dt(void) { - unsigned long ckil, osc, ckih1, ckih2; - - clk_get_freq_dt(&ckil, &osc, &ckih1, &ckih2); - return mx53_clocks_init(ckil, osc, ckih1, ckih2); + return mx53_clocks_init(0, 0, 0, 0); } -#endif