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Date: Wed, 06 Nov 2013 16:32:12 +0100
From: Alexander Sverdlin <alexander.sverdlin@....com>
To: ext Pantelis Antoniou <panto@...oniou-consulting.com>,
Wolfram Sang <wsa@...-dreams.de>
CC: Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <robherring2@...il.com>,
Stephen Warren <swarren@...dotorg.org>,
Matt Porter <matt.porter@...aro.org>,
Koen Kooi <koen@...inion.thruhere.net>,
Alison Chaiken <Alison_Chaiken@...tor.com>,
Dinh Nguyen <dinh.linux@...il.com>,
Jan Lubbe <jluebbe@...net.de>, Michael Stickel <ms@...able.de>,
Guenter Roeck <linux@...ck-us.net>,
Dirk Behme <dirk.behme@...il.com>,
Alan Tull <delicious.quinoa@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Michael Bohan <mbohan@...eaurora.org>,
Ionut Nicu <ioan.nicu.ext@....com>,
Michal Simek <monstr@...str.eu>,
Matt Ranostay <mranostay@...il.com>, linux-i2c@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: i2c: Export single device registration method
Hi!
On 05/11/13 18:57, ext Pantelis Antoniou wrote:
> Dynamically inserting i2c client device nodes requires the use
> of a single device registration method. Rework and export it.
>
> Don't be put off by the weird patch format, it's a simple move
> of the operations applied on each device to a function.
>
> Signed-off-by: Pantelis Antoniou <panto@...oniou-consulting.com>
We use the "same" patch since kernel 3.10.0, so:
Acked-by: Alexander Sverdlin <alexander.sverdlin@....com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@....com>
> ---
> drivers/i2c/i2c-core.c | 99 +++++++++++++++++++++++++++-----------------------
> include/linux/i2c.h | 10 +++++
> 2 files changed, 64 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 3be58f8..9be6803 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -49,6 +49,7 @@
> #include <linux/pm_runtime.h>
> #include <linux/acpi.h>
> #include <asm/uaccess.h>
> +#include <linux/err.h>
>
> #include "i2c-core.h"
>
> @@ -963,63 +964,71 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
> /* OF support code */
>
> #if IS_ENABLED(CONFIG_OF)
> -static void of_i2c_register_devices(struct i2c_adapter *adap)
> +struct i2c_client *
> +of_i2c_register_device(struct i2c_adapter *adap,
> + struct device_node *node)
> {
> - void *result;
> - struct device_node *node;
> + struct i2c_client *result;
> + struct i2c_board_info info = {};
> + struct dev_archdata dev_ad = {};
> + const __be32 *addr;
> + int len;
>
> - /* Only register child devices if the adapter has a node pointer set */
> - if (!adap->dev.of_node)
> - return;
> + dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
>
> - dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
> + if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
> + dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
> + node->full_name);
> + return ERR_PTR(-EINVAL);
> + }
>
> - for_each_available_child_of_node(adap->dev.of_node, node) {
> - struct i2c_board_info info = {};
> - struct dev_archdata dev_ad = {};
> - const __be32 *addr;
> - int len;
> + addr = of_get_property(node, "reg", &len);
> + if (!addr || (len < sizeof(int))) {
> + dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
> + node->full_name);
> + return ERR_PTR(-EINVAL);
> + }
>
> - dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
> + info.addr = be32_to_cpup(addr);
> + if (info.addr > (1 << 10) - 1) {
> + dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
> + info.addr, node->full_name);
> + return ERR_PTR(-EINVAL);
> + }
>
> - if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
> - dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
> - node->full_name);
> - continue;
> - }
> + info.irq = irq_of_parse_and_map(node, 0);
> + info.of_node = of_node_get(node);
> + info.archdata = &dev_ad;
>
> - addr = of_get_property(node, "reg", &len);
> - if (!addr || (len < sizeof(int))) {
> - dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
> - node->full_name);
> - continue;
> - }
> + if (of_get_property(node, "wakeup-source", NULL))
> + info.flags |= I2C_CLIENT_WAKE;
>
> - info.addr = be32_to_cpup(addr);
> - if (info.addr > (1 << 10) - 1) {
> - dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
> - info.addr, node->full_name);
> - continue;
> - }
> + request_module("%s%s", I2C_MODULE_PREFIX, info.type);
>
> - info.irq = irq_of_parse_and_map(node, 0);
> - info.of_node = of_node_get(node);
> - info.archdata = &dev_ad;
> + result = i2c_new_device(adap, &info);
> + if (result == NULL) {
> + dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
> + node->full_name);
> + of_node_put(node);
> + irq_dispose_mapping(info.irq);
> + return ERR_PTR(-EINVAL);
> + }
> + return result;
> +}
> +EXPORT_SYMBOL(of_i2c_register_device);
>
> - if (of_get_property(node, "wakeup-source", NULL))
> - info.flags |= I2C_CLIENT_WAKE;
> +static void of_i2c_register_devices(struct i2c_adapter *adap)
> +{
> + struct device_node *node;
>
> - request_module("%s%s", I2C_MODULE_PREFIX, info.type);
> + /* Only register child devices if the adapter has a node pointer set */
> + if (!adap->dev.of_node)
> + return;
>
> - result = i2c_new_device(adap, &info);
> - if (result == NULL) {
> - dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
> - node->full_name);
> - of_node_put(node);
> - irq_dispose_mapping(info.irq);
> - continue;
> - }
> - }
> + dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
> +
> + for_each_available_child_of_node(adap->dev.of_node, node)
> + of_i2c_register_device(adap, node);
> }
>
> static int of_dev_node_match(struct device *dev, void *data)
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 2ab11dc..10bcf86 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -545,6 +545,9 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap)
> #endif /* I2C */
>
> #if IS_ENABLED(CONFIG_OF)
> +struct i2c_client *
> +of_i2c_register_device(struct i2c_adapter *adap, struct device_node *node);
> +
> /* must call put_device() when done with returned i2c_client device */
> extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
>
> @@ -553,6 +556,13 @@ extern struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
>
> #else
>
> +static inline struct i2c_client *
> +of_i2c_register_device(struct i2c_adapter *adap,
> + struct device_node *node)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
> {
> return NULL;
>
--
Best regards,
Alexander Sverdlin.
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