From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anson Huang Subject: [PATCH 1/7] ARM: imx: add mmdc ipg clock operation for mmdc Date: Fri, 31 Aug 2018 15:53:12 +0800 Message-ID: <1535701998-20443-2-git-send-email-Anson.Huang@nxp.com> References: <1535701998-20443-1-git-send-email-Anson.Huang@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1535701998-20443-1-git-send-email-Anson.Huang@nxp.com> Sender: linux-kernel-owner@vger.kernel.org To: shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, fabio.estevam@nxp.com, robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, mturquette@baylibre.com, sboyd@kernel.org, colin.didier@devialet.com, clement.peron@devialet.com, ping.bai@nxp.com, aisheng.dong@nxp.com, shengjiu.wang@nxp.com, matteo.lisi@engicam.com, michael@amarulasolutions.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org Cc: Linux-imx@nxp.com List-Id: devicetree@vger.kernel.org i.MX6 SoCs have MMDC ipg clock for registers access, to make sure MMDC registers access successfully, add optional clock enable for MMDC driver. Signed-off-by: Anson Huang --- arch/arm/mach-imx/mmdc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c index 04b3bf7..e49e068 100644 --- a/arch/arm/mach-imx/mmdc.c +++ b/arch/arm/mach-imx/mmdc.c @@ -11,6 +11,7 @@ * http://www.gnu.org/copyleft/gpl.html */ +#include #include #include #include @@ -546,7 +547,20 @@ static int imx_mmdc_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; void __iomem *mmdc_base, *reg; + struct clk *mmdc_ipg_clk; u32 val; + int err; + + /* the ipg clock is optional */ + mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mmdc_ipg_clk)) + mmdc_ipg_clk = NULL; + + err = clk_prepare_enable(mmdc_ipg_clk); + if (err) { + dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n"); + return err; + } mmdc_base = of_iomap(np, 0); WARN_ON(!mmdc_base); -- 2.7.4