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Received: from 108-198-5-147.lightspeed.okcbok.sbcglobal.net ([108.198.5.147]:44986 helo=freyr.lechnology.com) by vern.gendns.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1ewfTn-002UlD-IV; Thu, 15 Mar 2018 22:52:27 -0400 From: David Lechner To: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 40/42] ARM: davinci: add device tree support to timer Date: Thu, 15 Mar 2018 21:52:56 -0500 Message-Id: <1521168778-27236-41-git-send-email-david@lechnology.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1521168778-27236-1-git-send-email-david@lechnology.com> References: <1521168778-27236-1-git-send-email-david@lechnology.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - lists.infradead.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180315_204621_202514_89076449 X-CRM114-Status: GOOD ( 11.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , David Lechner , Kevin Hilman , Stephen Boyd , Michael Turquette , Sekhar Nori , linux-kernel@vger.kernel.org, Bartosz Golaszewski , Rob Herring , Adam Ford MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This adds device tree support to the davinci timer so that when clocks are moved to device tree, the timer will still work. Signed-off-by: David Lechner --- v8 changes: - none v7 changes: - add workaround for platform devices not available in early boot v6 changes: - none arch/arm/mach-davinci/Kconfig | 1 + arch/arm/mach-davinci/time.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig index ba9912b..da8a039 100644 --- a/arch/arm/mach-davinci/Kconfig +++ b/arch/arm/mach-davinci/Kconfig @@ -59,6 +59,7 @@ config MACH_DA8XX_DT default y depends on ARCH_DAVINCI_DA850 select PINCTRL + select TIMER_OF help Say y here to include support for TI DaVinci DA850 based using Flattened Device Tree. More information at Documentation/devicetree diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c index d6a78f7..590b118 100644 --- a/arch/arm/mach-davinci/time.c +++ b/arch/arm/mach-davinci/time.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -405,3 +406,33 @@ void __init davinci_timer_init(struct clk *timer_clk) for (i=0; i< ARRAY_SIZE(timers); i++) timer32_config(&timers[i]); } + +static int __init of_davinci_timer_init(struct device_node *np) +{ + struct clk *clk; + + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + struct of_phandle_args clkspec; + + /* + * Fall back to using ref_clk if the actual clock is not + * available. This currently always happens because platform + * clocks (i.e PLLs and PSCs) are registered as platform + * devices and therefore are not available at this point in + * the boot process. + */ + clkspec.np = of_find_node_by_name(NULL, "ref_clk"); + if (IS_ERR(clkspec.np)) { + pr_err("%s: No clock available for timer!\n", __func__); + return PTR_ERR(clkspec.np); + } + clk = of_clk_get_from_provider(&clkspec); + of_node_put(clkspec.np); + } + + davinci_timer_init(clk); + + return 0; +} +TIMER_OF_DECLARE(davinci_timer, "ti,davinci-timer", of_davinci_timer_init);