Thanks Guenter for the comments, I'll first update the lm87 Documentation to include the
device tree information and then I'll update the documentation with my proposed update along
with the updated patch for reading the property in the driver.
Thanks,
Mahoda
________________________________________
From: linux-hwmon-owner@xxxxxxxxxxxxxxx <linux-hwmon-owner@xxxxxxxxxxxxxxx> on behalf of Guenter Roeck <linux@xxxxxxxxxxxx>
Sent: Wednesday, 7 September 2016 5:20 a.m.
To: Mahoda Ratnayaka
Cc: Jean Delvare; linux-hwmon@xxxxxxxxxxxxxxx; Chris Packham
Subject: Re: [PATCH] hwmon: (lm87) Add channel data from the dts file.
On Mon, Sep 05, 2016 at 05:36:14PM +1200, Mahoda Ratnayaka wrote:
> Currently there is no method for setting the channel
> value from the DTS file. When, the driver uses a dts
> file to initialize the driver platform_data is not set.
> As a the result channel variable may not be set correctly.
>
> Without the channel variable set correctly, some of the
> sensors will not be initialized correctly. For example
> temp3 sensor sysfs entries.
>
> This adds the required functionality to set the channel
> variable from the DTS file. This is done via reading the
> reading a property named "channel" from the lm87 driver.
>
Devicetree properties need to be documented and approved by devicetree
maintainers.
> Signed-off-by: Mahoda Ratnayaka <mahoda.ratnayaka@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/hwmon/lm87.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
> index a5e2958..ac0018b 100644
> --- a/drivers/hwmon/lm87.c
> +++ b/drivers/hwmon/lm87.c
> @@ -858,14 +858,25 @@ static void lm87_remove_files(struct i2c_client *client)
> static void lm87_init_client(struct i2c_client *client)
> {
> struct lm87_data *data = i2c_get_clientdata(client);
> + struct device_node *np = NULL;
> + const char *channel = NULL;
> + u8 val;
>
> - if (dev_get_platdata(&client->dev)) {
> + np = client->dev.of_node;
> +
> + /* Use value read from the dts file to setup channel value. */
Isn't that obvious from the code ?
> + if (np && of_property_read_u8(np, "channels", &val) == 0) {
When using a function, you need to include the file declaring it,
in this case linux/of.h. of_property_read_u8( )already checks for
np == NULL, so there is no need to check it here. Instead of "== 0",
please use "!".
> + data->channel = val;
> + lm87_write_value(client,
> + LM87_REG_CHANNEL_MODE, data->channel);
> + } else if (dev_get_platdata(&client->dev)) {
> data->channel = *(u8 *)dev_get_platdata(&client->dev);
> lm87_write_value(client,
> LM87_REG_CHANNEL_MODE, data->channel);
> } else {
> data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
> }
> +
Please no unnecessary whitespace changes.
> data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
>
> if (!(data->config & 0x01)) {
> --
> 2.9.3
>
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