Linux-i2c Archive on lore.kernel.org
 help / color / Atom feed
From: Chris Packham <Chris.Packham@alliedtelesis.co.nz>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "wsa@kernel.org" <wsa@kernel.org>
Subject: Re: [PATCH v1 1/4] i2c: mpc: Use devm_clk_get_optional()
Date: Tue, 13 Apr 2021 23:34:43 +0000
Message-ID: <f6a11495-b015-d86d-76fe-ed0db8635e2b@alliedtelesis.co.nz> (raw)
In-Reply-To: <20210413143756.60138-1-andriy.shevchenko@linux.intel.com>


On 14/04/21 2:37 am, Andy Shevchenko wrote:
> The peripheral clock is optional and we may get an -EPROBE_DEFER error code
> which would not be propagated correctly, fix this by using
> devm_clk_get_optional().
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

None of the systems I have access to make use of the clocks property so 
I can't do much testing. I can say it still handles the absence of a 
clocks property correctly.

> ---
>   drivers/i2c/busses/i2c-mpc.c | 25 ++++++++++++-------------
>   1 file changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 3c8bcdfff7e7..6dc029a31d36 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -690,17 +690,18 @@ static int fsl_i2c_probe(struct platform_device *op)
>   	 * enable clock for the I2C peripheral (non fatal),
>   	 * keep a reference upon successful allocation
>   	 */
> -	clk = devm_clk_get(&op->dev, NULL);
> -	if (!IS_ERR(clk)) {
> -		err = clk_prepare_enable(clk);
> -		if (err) {
> -			dev_err(&op->dev, "failed to enable clock\n");
> -			return err;
> -		} else {
> -			i2c->clk_per = clk;
> -		}
> +	clk = devm_clk_get_optional(&op->dev, NULL);
> +	if (IS_ERR(clk))
> +		return PTR_ERR(clk);
> +
> +	err = clk_prepare_enable(clk);
> +	if (err) {
> +		dev_err(&op->dev, "failed to enable clock\n");
> +		return err;
>   	}
>   
> +	i2c->clk_per = clk;
> +
>   	if (of_property_read_bool(op->dev.of_node, "fsl,preserve-clocking")) {
>   		clock = MPC_I2C_CLOCK_PRESERVE;
>   	} else {
> @@ -744,8 +745,7 @@ static int fsl_i2c_probe(struct platform_device *op)
>   	return 0;
>   
>    fail_add:
> -	if (i2c->clk_per)
> -		clk_disable_unprepare(i2c->clk_per);
> +	clk_disable_unprepare(i2c->clk_per);
>   
>   	return result;
>   };
> @@ -756,8 +756,7 @@ static int fsl_i2c_remove(struct platform_device *op)
>   
>   	i2c_del_adapter(&i2c->adap);
>   
> -	if (i2c->clk_per)
> -		clk_disable_unprepare(i2c->clk_per);
> +	clk_disable_unprepare(i2c->clk_per);
>   
>   	return 0;
>   };

      parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 14:37 Andy Shevchenko
2021-04-13 14:37 ` [PATCH v1 2/4] i2c: mpc: Remove CONFIG_PM_SLEEP ifdeffery Andy Shevchenko
2021-04-13 18:05   ` kernel test robot
2021-04-13 23:43   ` Chris Packham
2021-04-14 12:14     ` Andy Shevchenko
2021-04-14 21:17       ` Chris Packham
2021-04-13 14:37 ` [PATCH v1 3/4] i2c: mpc: Use device_get_match_data() helper Andy Shevchenko
2021-04-13 23:45   ` Chris Packham
2021-04-13 14:37 ` [PATCH v1 4/4] i2c: mpc: Drop duplicate message from devm_platform_ioremap_resource() Andy Shevchenko
2021-04-13 23:45   ` Chris Packham
2021-04-13 23:34 ` Chris Packham [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=f6a11495-b015-d86d-76fe-ed0db8635e2b@alliedtelesis.co.nz \
    --to=chris.packham@alliedtelesis.co.nz \
    --cc=andriy.shevchenko@linux.intel.com \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=wsa@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-i2c Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-i2c/0 linux-i2c/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-i2c linux-i2c/ https://lore.kernel.org/linux-i2c \
		linux-i2c@vger.kernel.org
	public-inbox-index linux-i2c

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-i2c


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git