From patchwork Thu Jul 14 16:03:45 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 2700 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 4627124259 for ; Thu, 14 Jul 2011 15:52:31 +0000 (UTC) Received: from mail-qw0-f52.google.com (mail-qw0-f52.google.com [209.85.216.52]) by fiordland.canonical.com (Postfix) with ESMTP id 13E90A18118 for ; Thu, 14 Jul 2011 15:52:30 +0000 (UTC) Received: by mail-qw0-f52.google.com with SMTP id 8so258873qwb.11 for ; Thu, 14 Jul 2011 08:52:30 -0700 (PDT) Received: by 10.229.25.212 with SMTP id a20mr1829761qcc.148.1310658750781; Thu, 14 Jul 2011 08:52:30 -0700 (PDT) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.229.217.78 with SMTP id hl14cs19427qcb; Thu, 14 Jul 2011 08:52:30 -0700 (PDT) Received: by 10.150.69.3 with SMTP id r3mr2512246yba.139.1310658748622; Thu, 14 Jul 2011 08:52:28 -0700 (PDT) Received: from mail-iw0-f178.google.com (mail-iw0-f178.google.com [209.85.214.178]) by mx.google.com with ESMTPS id h8si1115054icx.80.2011.07.14.08.52.28 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 14 Jul 2011 08:52:28 -0700 (PDT) Received-SPF: neutral (google.com: 209.85.214.178 is neither permitted nor denied by best guess record for domain of shawn.guo@linaro.org) client-ip=209.85.214.178; Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.214.178 is neither permitted nor denied by best guess record for domain of shawn.guo@linaro.org) smtp.mail=shawn.guo@linaro.org Received: by mail-iw0-f178.google.com with SMTP id 10so360943iwc.37 for ; Thu, 14 Jul 2011 08:52:28 -0700 (PDT) Received: by 10.42.162.194 with SMTP id z2mr2809192icx.79.1310658747683; Thu, 14 Jul 2011 08:52:27 -0700 (PDT) Received: from localhost.localdomain ([117.82.20.93]) by mx.google.com with ESMTPS id hq1sm396723icc.2.2011.07.14.08.52.19 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 14 Jul 2011 08:52:27 -0700 (PDT) From: Shawn Guo To: linux-i2c@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, patches@linaro.org, Shawn Guo , Grant Likely , Darius Augulis , Ben Dooks Subject: [PATCH 2/2] i2c/imx: add device tree probe support Date: Fri, 15 Jul 2011 00:03:45 +0800 Message-Id: <1310659425-17499-3-git-send-email-shawn.guo@linaro.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1310659425-17499-1-git-send-email-shawn.guo@linaro.org> References: <1310659425-17499-1-git-send-email-shawn.guo@linaro.org> It adds device tree probe support for i2c-imx driver. Signed-off-by: Shawn Guo Cc: Grant Likely Cc: Darius Augulis Cc: Ben Dooks Acked-by: Grant Likely --- .../devicetree/bindings/i2c/fsl-imx-i2c.txt | 25 ++++++++++++++++++++ drivers/i2c/busses/i2c-imx.c | 25 +++++++++++++++---- 2 files changed, 44 insertions(+), 6 deletions(-) create mode 100644 Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt diff --git a/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt new file mode 100644 index 0000000..5066cd9 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/fsl-imx-i2c.txt @@ -0,0 +1,25 @@ +* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX + +Required properties: +- compatible : Should be "fsl,-i2c" +- reg : Should contain I2C/HS-I2C registers location and length +- interrupts : Should contain I2C/HS-I2C interrupt + +Optional properties: +- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz. + The absence of the propoerty indicates the default frequency 100 kHz. + +Examples: + +i2c@83fc4000 { /* I2C2 on i.MX51 */ + compatible = "fsl,imx51-i2c", "fsl,imx1-i2c"; + reg = <0x83fc4000 0x4000>; + interrupts = <63>; +}; + +i2c@70038000 { /* HS-I2C on i.MX51 */ + compatible = "fsl,imx51-i2c", "fsl,imx1-i2c"; + reg = <0x70038000 0x4000>; + interrupts = <63>; + clock-frequency = <400000> +}; diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 54d809e..58832e5 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -48,6 +48,9 @@ #include #include #include +#include +#include +#include #include #include @@ -125,6 +128,11 @@ struct imx_i2c_struct { unsigned int ifdr; /* IMX_I2C_IFDR */ }; +static const struct of_device_id i2c_imx_dt_ids[] = { + { .compatible = "fsl,imx1-i2c", }, + { /* sentinel */ } +}; + /** Functions for IMX I2C adapter driver *************************************** *******************************************************************************/ @@ -469,7 +477,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev) struct imxi2c_platform_data *pdata = pdev->dev.platform_data; void __iomem *base; resource_size_t res_size; - int irq; + int irq, bitrate; int ret; dev_dbg(&pdev->dev, "<%s>\n", __func__); @@ -512,6 +520,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_imx->adapter.algo = &i2c_imx_algo; i2c_imx->adapter.dev.parent = &pdev->dev; i2c_imx->adapter.nr = pdev->id; + i2c_imx->adapter.dev.of_node = pdev->dev.of_node; i2c_imx->irq = irq; i2c_imx->base = base; i2c_imx->res = res; @@ -538,10 +547,12 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); /* Set up clock divider */ - if (pdata && pdata->bitrate) - i2c_imx_set_clk(i2c_imx, pdata->bitrate); - else - i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE); + bitrate = IMX_I2C_BIT_RATE; + ret = of_property_read_u32(pdev->dev.of_node, + "clock-frequency", &bitrate); + if (ret < 0 && pdata && pdata->bitrate) + bitrate = pdata->bitrate; + i2c_imx_set_clk(i2c_imx, bitrate); /* Set up chip registers to defaults */ writeb(0, i2c_imx->base + IMX_I2C_I2CR); @@ -554,6 +565,8 @@ static int __init i2c_imx_probe(struct platform_device *pdev) goto fail5; } + of_i2c_register_devices(&i2c_imx->adapter); + /* Set up platform driver data */ platform_set_drvdata(pdev, i2c_imx); @@ -584,7 +597,6 @@ fail1: static int __exit i2c_imx_remove(struct platform_device *pdev) { struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); - struct imxi2c_platform_data *pdata = pdev->dev.platform_data; /* remove adapter */ dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n"); @@ -613,6 +625,7 @@ static struct platform_driver i2c_imx_driver = { .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, + .of_match_table = i2c_imx_dt_ids, } };