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From: "Heiko Stübner" <heiko@sntech.de>
To: linux-i2c@vger.kernel.org, John Keeping <john@metanate.com>
Cc: John Keeping <john@metanate.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i2c: rk3x: enable clock before getting rate
Date: Sun, 21 Nov 2021 19:00:55 +0100	[thread overview]
Message-ID: <1738891.e3IbIVKTtj@diego> (raw)
In-Reply-To: <20211004131539.1253195-1-john@metanate.com>

Am Montag, 4. Oktober 2021, 15:15:39 CET schrieb John Keeping:
> clk_get_rate() is documented as requiring the clock to be enabled.
> Ensure that the bus clock is enabled before calling clk_get_rate() in
> rk3x_i2c_probe() to satisfy this requirement.
> 
> Signed-off-by: John Keeping <john@metanate.com>

Reviewed-by: Heiko Stuebner <heiko@sntech.de>

Do you maybe want to repost and include the actual i2c-maintainers
in the recipient list?


Heiko

> ---
>  drivers/i2c/busses/i2c-rk3x.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
> index 819ab4ee517e..332755fab2a1 100644
> --- a/drivers/i2c/busses/i2c-rk3x.c
> +++ b/drivers/i2c/busses/i2c-rk3x.c
> @@ -1338,8 +1338,15 @@ static int rk3x_i2c_probe(struct platform_device *pdev)
>  		goto err_pclk;
>  	}
>  
> +	ret = clk_enable(i2c->clk);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Can't enable bus clk: %d\n", ret);
> +		goto err_clk_notifier;
> +	}
> +
>  	clk_rate = clk_get_rate(i2c->clk);
>  	rk3x_i2c_adapt_div(i2c, clk_rate);
> +	clk_disable(i2c->clk);
>  
>  	ret = i2c_add_adapter(&i2c->adap);
>  	if (ret < 0)
> 





  reply	other threads:[~2021-11-21 18:01 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-04 13:15 John Keeping
2021-11-21 18:00 ` Heiko Stübner [this message]
2021-11-22  7:39   ` Wolfram Sang
2021-11-29  9:40 ` Wolfram Sang

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