From patchwork Sat Dec 21 05:01:41 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Shiyan X-Patchwork-Id: 304371 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id CA7E52C00AA for ; Sat, 21 Dec 2013 16:02:10 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751548Ab3LUFCJ (ORCPT ); Sat, 21 Dec 2013 00:02:09 -0500 Received: from smtp20.mail.ru ([94.100.176.173]:45924 "EHLO smtp20.mail.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750914Ab3LUFCI (ORCPT ); Sat, 21 Dec 2013 00:02:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mail.ru; s=mail2; h=Message-Id:Date:Subject:Cc:To:From; bh=/ZhE+QnR+LlJitdCoSeR7IX61+W8IlZ8RuKQBI/vp0M=; b=LxfZuk7YHgv5dl4N8fBzRayg7cyquhp9cl15aNMVxBmzTE2wGCJKOL7KTnGYcsmnDRNwdicdFbGJtJIycimf4HlJZRXIo2mCwkv5twpT5LNe3FsSsi7/gLGA9jCJ4jeO2PD+Zgd7g2z2t6ePCnQk1rEstkuyFv/62Qp166VgBkU=; Received: from [188.134.40.128] (port=62524 helo=shc.zet) by smtp20.mail.ru with esmtpa (envelope-from ) id 1VuEhR-0000BQ-VZ; Sat, 21 Dec 2013 09:02:06 +0400 From: Alexander Shiyan To: linux-can@vger.kernel.org Cc: Wolfgang Grandegger , Marc Kleine-Budde , devicetree@vger.kernel.org, Alexander Shiyan Subject: [PATCH] can: mcp251x: Add device tree support Date: Sat, 21 Dec 2013 09:01:41 +0400 Message-Id: <1387602101-27851-1-git-send-email-shc_work@mail.ru> X-Mailer: git-send-email 1.8.3.2 X-Spam: Not detected X-Mras: Ok Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds Device Tree support to the Microchip MCP251X driver. Signed-off-by: Alexander Shiyan --- .../bindings/net/can/microchip,mcp251x.txt | 25 ++++++ drivers/net/can/mcp251x.c | 99 ++++++++++++++++------ 2 files changed, 99 insertions(+), 25 deletions(-) create mode 100644 Documentation/devicetree/bindings/net/can/microchip,mcp251x.txt diff --git a/Documentation/devicetree/bindings/net/can/microchip,mcp251x.txt b/Documentation/devicetree/bindings/net/can/microchip,mcp251x.txt new file mode 100644 index 0000000..ee3723b --- /dev/null +++ b/Documentation/devicetree/bindings/net/can/microchip,mcp251x.txt @@ -0,0 +1,25 @@ +* Microchip MCP251X stand-alone CAN controller device tree bindings + +Required properties: + - compatible: Should be one of the following: + - "microchip,mcp2510" for MCP2510. + - "microchip,mcp2515" for MCP2515. + - reg: SPI chip select. + - clocks: The clock feeding the CAN controller. + - interrupt-parent: The parent interrupt controller. + - interrupts: Should contain IRQ line for the CAN controller. + +Optional properties: + - vdd-supply: Regulator that powers the CAN controller. + - xceiver-supply: Regulator that powers the CAN transceiver. + +Example: + can0: can@1 { + compatible = "microchip,mcp2515"; + reg = <1>; + clocks = <&clk24m>; + interrupt-parent = <&gpio4>; + interrupts = <13 0x2>; + vdd-supply = <®5v0>; + xceiver-supply = <®5v0>; + }; diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c index 88d3877..a731253 100644 --- a/drivers/net/can/mcp251x.c +++ b/drivers/net/can/mcp251x.c @@ -58,6 +58,7 @@ #include #include #include +#include #include #include #include @@ -68,6 +69,8 @@ #include #include #include +#include +#include #include #include #include @@ -263,6 +266,7 @@ struct mcp251x_priv { int restart_tx; struct regulator *power; struct regulator *transceiver; + struct clk *clk; }; #define MCP251X_IS(_model) \ @@ -994,22 +998,65 @@ static const struct net_device_ops mcp251x_netdev_ops = { .ndo_start_xmit = mcp251x_hard_start_xmit, }; +static struct of_device_id __maybe_unused mcp251x_of_match[] = { + { + .compatible = "microchip,mcp2510", + .data = (void *)CAN_MCP251X_MCP2510, + }, + { + .compatible = "microchip,mcp2515", + .data = (void *)CAN_MCP251X_MCP2515, + }, + { } +}; +MODULE_DEVICE_TABLE(of, mcp251x_of_match); + +static const struct spi_device_id mcp251x_id_table[] = { + { + .name = "mcp2510", + .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2510, + }, + { + .name = "mcp2515", + .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2515, + }, + { } +}; +MODULE_DEVICE_TABLE(spi, mcp251x_id_table); + static int mcp251x_can_probe(struct spi_device *spi) { + const struct of_device_id *of_id = of_match_device(mcp251x_of_match, + &spi->dev); + struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev); struct net_device *net; struct mcp251x_priv *priv; - struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev); - int ret = -ENODEV; + int freq, ret = -ENODEV; + struct clk *clk; + + clk = devm_clk_get(&spi->dev, NULL); + if (IS_ERR(clk)) { + if (pdata) + freq = pdata->oscillator_frequency; + else + return PTR_ERR(clk); + } else { + freq = clk_get_rate(clk); + } - if (!pdata) - /* Platform data is required for osc freq */ - goto error_out; + /* Sanity check */ + if (freq < 1000000 || freq > 25000000) + return -ERANGE; /* Allocate can/net device */ net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX); - if (!net) { - ret = -ENOMEM; - goto error_alloc; + if (!net) + return -ENOMEM; + + if (!IS_ERR(clk)) { + ret = clk_prepare_enable(clk); + if (ret) + goto out_free; } net->netdev_ops = &mcp251x_netdev_ops; @@ -1018,23 +1065,27 @@ static int mcp251x_can_probe(struct spi_device *spi) priv = netdev_priv(net); priv->can.bittiming_const = &mcp251x_bittiming_const; priv->can.do_set_mode = mcp251x_do_set_mode; - priv->can.clock.freq = pdata->oscillator_frequency / 2; + priv->can.clock.freq = freq / 2; priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY; - priv->model = spi_get_device_id(spi)->driver_data; + if (of_id) + priv->model = (enum mcp251x_model)of_id->data; + else + priv->model = spi_get_device_id(spi)->driver_data; priv->net = net; + priv->clk = clk; priv->power = devm_regulator_get(&spi->dev, "vdd"); priv->transceiver = devm_regulator_get(&spi->dev, "xceiver"); if ((PTR_ERR(priv->power) == -EPROBE_DEFER) || (PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) { ret = -EPROBE_DEFER; - goto error_power; + goto out_clk; } ret = mcp251x_power_enable(priv->power, 1); if (ret) - goto error_power; + goto out_clk; spi_set_drvdata(spi, priv); @@ -1113,11 +1164,14 @@ error_probe: dma_free_coherent(&spi->dev, PAGE_SIZE, priv->spi_tx_buf, priv->spi_tx_dma); mcp251x_power_enable(priv->power, 0); -error_power: + +out_clk: + if (!IS_ERR(clk)) + clk_disable_unprepare(clk); + +out_free: free_candev(net); -error_alloc: - dev_err(&spi->dev, "probe failed\n"); -error_out: + return ret; } @@ -1135,6 +1189,9 @@ static int mcp251x_can_remove(struct spi_device *spi) mcp251x_power_enable(priv->power, 0); + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); + free_candev(net); return 0; @@ -1197,21 +1254,13 @@ static int mcp251x_can_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(mcp251x_can_pm_ops, mcp251x_can_suspend, mcp251x_can_resume); -static const struct spi_device_id mcp251x_id_table[] = { - { "mcp2510", CAN_MCP251X_MCP2510 }, - { "mcp2515", CAN_MCP251X_MCP2515 }, - { }, -}; - -MODULE_DEVICE_TABLE(spi, mcp251x_id_table); - static struct spi_driver mcp251x_can_driver = { .driver = { .name = DEVICE_NAME, .owner = THIS_MODULE, + .of_match_table = of_match_ptr(mcp251x_of_match), .pm = &mcp251x_can_pm_ops, }, - .id_table = mcp251x_id_table, .probe = mcp251x_can_probe, .remove = mcp251x_can_remove,