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Message-ID: <AANLkTi=czAa6TQsVvGRg+Uz0BMnriUL5==6ehEym8e3b@mail.gmail.com>
Date: Mon, 21 Feb 2011 09:10:11 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: Michal Simek <monstr@...str.eu>
Cc: devicetree-discuss@...ts.ozlabs.org, john.williams@...alogix.com,
linux-kernel@...r.kernel.org, John.Linn@...inx.com,
Linux I2C <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH] i2c: xiic: Add OF support for Xilinx i2c bus interface
On Mon, Feb 21, 2011 at 5:07 AM, Michal Simek <monstr@...str.eu> wrote:
> Add OF support to Xilinx i2c bus interface.
> It is used on Microblaze systems.
>
> Signed-off-by: Michal Simek <monstr@...str.eu>
Hi Michal,
Don't forget to cc: linux-i2c@...r.kernel.org for i2c driver changes.
The majority of this patch isn't needed. Platform drivers can easily
handle both dt and non-dt usage at runtime using the same .probe and
.remove hooks. All you should need to do is add an of_match_table to
the existing platform driver and set the of node pointer like this:
i2c->adap.dev.of_node = of_node_get(op->dev.of_node); You'll also
need to fix the probe routine to *not* bail if it doesn't get a
platform data pointer. The dt support code takes care of populating
the platform_device resource structure so that the normal method of
obtaining base address and irq works.
g.
> ---
> drivers/i2c/busses/i2c-xiic.c | 111 ++++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 109 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
> index a9c419e..22951a3 100644
> --- a/drivers/i2c/busses/i2c-xiic.c
> +++ b/drivers/i2c/busses/i2c-xiic.c
> @@ -2,6 +2,8 @@
> * i2c-xiic.c
> * Copyright (c) 2002-2007 Xilinx Inc.
> * Copyright (c) 2009-2010 Intel Corporation
> + * Copyright (c) 2010-2011 Michal Simek <monstr@...str.eu>
> + * Copyright (c) 2010-2011 PetaLogix
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License version 2 as
> @@ -41,6 +43,13 @@
> #include <linux/io.h>
> #include <linux/slab.h>
>
> +#ifdef CONFIG_OF
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_i2c.h>
> +#include <linux/of_address.h>
> +#endif
#ifdef CONFIG_OF should no longer needed around the device tree
headers (if you find that it is, then it is a bug that should be
reported and fixed)
> +
> #define DRIVER_NAME "xiic-i2c"
>
> enum xilinx_i2c_state {
> @@ -426,7 +435,7 @@ static void xiic_process(struct xiic_i2c *i2c)
> xiic_wakeup(i2c, STATE_ERROR);
>
> } else if (pend & (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK)) {
> - /* Transmit register/FIFO is empty or ½ empty */
> + /* Transmit register/FIFO is empty or 1/2 empty */
>
> clr = pend &
> (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK);
> @@ -687,7 +696,7 @@ static struct i2c_adapter xiic_adapter = {
> .algo = &xiic_algorithm,
> };
>
> -
> +#ifndef CONFIG_OF
> static int __devinit xiic_i2c_probe(struct platform_device *pdev)
> {
> struct xiic_i2c *i2c;
> @@ -808,6 +817,104 @@ static struct platform_driver xiic_i2c_driver = {
> },
> };
>
> +#else
> +static int __devinit xiic_i2c_of_probe(struct platform_device *op)
> +{
> + struct xiic_i2c *i2c;
> + int result = 0;
> +
> + i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
> + if (!i2c)
> + return -ENOMEM;
> +
> + i2c->dev = &op->dev; /* for debug and error output */
> +
> + spin_lock_init(&i2c->lock);
> + init_waitqueue_head(&i2c->wait);
> +
> + i2c->base = of_iomap(op->dev.of_node, 0);
> + if (!i2c->base) {
> + dev_err(i2c->dev, "failed to map controller\n");
> + result = -ENOMEM;
> + goto fail_map;
> + }
> +
> + i2c->irq = irq_of_parse_and_map(op->dev.of_node, 0);
> + if (i2c->irq) { /* no i2c->irq implies polling */
> + result = request_irq(i2c->irq, xiic_isr,
> + 0, op->name, i2c);
> + if (result < 0) {
> + dev_err(i2c->dev, "failed to attach interrupt\n");
> + goto fail_request;
> + }
> + }
> +
> + dev_set_drvdata(&op->dev, i2c);
> + i2c->adap = xiic_adapter;
> + i2c_set_adapdata(&i2c->adap, i2c);
> + i2c->adap.dev.parent = &op->dev;
> + i2c->adap.dev.of_node = of_node_get(op->dev.of_node);
> +
> + result = i2c_add_adapter(&i2c->adap);
> + if (result < 0) {
> + dev_err(i2c->dev, "failed to add adapter\n");
> + goto fail_add;
> + }
> +
> + dev_info(i2c->dev, "mapped to 0x%08X, irq=%d\n",
> + (unsigned int)i2c->base, i2c->irq);
> +
> + xiic_reinit(i2c);
> + of_i2c_register_devices(&i2c->adap);
> +
> + return result;
> +
> +fail_add:
> + dev_set_drvdata(&op->dev, NULL);
> + free_irq(i2c->irq, i2c);
> +fail_request:
> + irq_dispose_mapping(i2c->irq);
> + iounmap(i2c->base);
> +fail_map:
> + kfree(i2c);
> + return result;
> +}
> +
> +static int __devexit xiic_i2c_of_remove(struct platform_device *op)
> +{
> + struct xiic_i2c *i2c = dev_get_drvdata(&op->dev);
> +
> + i2c_del_adapter(&i2c->adap);
> + xiic_deinit(i2c);
> + dev_set_drvdata(&op->dev, NULL);
> +
> + if (i2c->irq)
> + free_irq(i2c->irq, i2c);
> +
> + irq_dispose_mapping(i2c->irq);
> + iounmap(i2c->base);
> + kfree(i2c);
> + return 0;
> +}
> +
> +/* Match table for of_platform binding */
> +static struct of_device_id __devinitdata xilinx_iic_of_match[] = {
> + { .compatible = "xlnx,xps-iic-2.00.a", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, xilinx_iic_of_match);
> +
> +static struct platform_driver xiic_i2c_driver = {
> + .probe = xiic_i2c_of_probe,
> + .remove = __devexit_p(xiic_i2c_of_remove),
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = DRIVER_NAME,
> + .of_match_table = xilinx_iic_of_match,
> + },
> +};
> +#endif
> +
> static int __init xiic_i2c_init(void)
> {
> return platform_driver_register(&xiic_i2c_driver);
> --
> 1.5.5.6
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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