From patchwork Fri Mar 15 20:06:23 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 228168 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:4978:20e::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 994E42C00B9 for ; Sat, 16 Mar 2013 07:10:20 +1100 (EST) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UGatr-0007t5-19; Fri, 15 Mar 2013 20:06:47 +0000 Received: from mail.free-electrons.com ([94.23.35.102]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UGatg-0007qp-Qf for linux-arm-kernel@lists.infradead.org; Fri, 15 Mar 2013 20:06:38 +0000 Received: by mail.free-electrons.com (Postfix, from userid 106) id 7438BB95; Fri, 15 Mar 2013 21:06:36 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.3.2 Received: from localhost (128-79-216-144.hfc.dyn.abo.bbox.fr [128.79.216.144]) by mail.free-electrons.com (Postfix) with ESMTPSA id 0894873E; Fri, 15 Mar 2013 21:06:36 +0100 (CET) From: Maxime Ripard To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/6] serial: 8250_dw: add support for clk api Date: Fri, 15 Mar 2013 21:06:23 +0100 Message-Id: <1363377988-4966-2-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1363377988-4966-1-git-send-email-maxime.ripard@free-electrons.com> References: <1363377988-4966-1-git-send-email-maxime.ripard@free-electrons.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130315_160637_136716_EF461059 X-CRM114-Status: GOOD ( 15.14 ) X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -2.4 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] Cc: =?UTF-8?q?Emilio=20L=C3=B3pez?= , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, sunny@allwinnertech.com, shuge@allwinnertech.com, Jiri Slaby , kevin@allwinnertech.com 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 From: Emilio López This commit implements support for using the clk api; this lets us use the "clocks" property with device tree, instead of having to use clock-frequency. Signed-off-by: Emilio López Signed-off-by: Maxime Ripard --- drivers/tty/serial/8250/8250_dw.c | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index db0e66f..9a834a1 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "8250.h" @@ -55,8 +56,9 @@ struct dw8250_data { - int last_lcr; - int line; + int last_lcr; + int line; + struct clk *clk; }; static void dw8250_serial_out(struct uart_port *p, int offset, int value) @@ -136,8 +138,13 @@ static int dw8250_probe_of(struct uart_port *p) if (!of_property_read_u32(np, "reg-shift", &val)) p->regshift = val; + /* clock got configured through clk api, all done */ + if (p->uartclk) + return 0; + + /* try to find out clock frequency from DT as fallback */ if (of_property_read_u32(np, "clock-frequency", &val)) { - dev_err(p->dev, "no clock-frequency property set\n"); + dev_err(p->dev, "clk or clock-frequency not defined\n"); return -EINVAL; } p->uartclk = val; @@ -294,9 +301,21 @@ static int dw8250_probe(struct platform_device *pdev) if (!uart.port.membase) return -ENOMEM; + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(data->clk)) + data->clk = NULL; + else + clk_prepare_enable(data->clk); + uart.port.iotype = UPIO_MEM; uart.port.serial_in = dw8250_serial_in; uart.port.serial_out = dw8250_serial_out; + uart.port.private_data = data; + uart.port.uartclk = clk_get_rate(data->clk); dw8250_setup_port(&uart); @@ -312,12 +331,6 @@ static int dw8250_probe(struct platform_device *pdev) return -ENODEV; } - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); - if (!data) - return -ENOMEM; - - uart.port.private_data = data; - data->line = serial8250_register_8250_port(&uart); if (data->line < 0) return data->line; @@ -333,6 +346,8 @@ static int dw8250_remove(struct platform_device *pdev) serial8250_unregister_port(data->line); + clk_disable_unprepare(data->clk); + return 0; }