linux-kernel - Re: [PATCH v7 1/4] i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller

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Date:   Sun, 29 Jul 2018 12:32:08 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Karthikeyan Ramasubramanian <kramasub@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, gregkh@...uxfoundation.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
        evgreen@...omium.org, acourbot@...omium.org, swboyd@...omium.org,
        dianders@...omium.org, Sagar Dharia <sdharia@...eaurora.org>,
        Girish Mahadevan <girishm@...eaurora.org>
Subject: Re: [PATCH v7 1/4] i2c: i2c-qcom-geni: Add bus driver for the
 Qualcomm GENI I2C controller

On Tue, Jun 12, 2018 at 11:09:05AM -0600, Karthikeyan Ramasubramanian wrote:
> This bus driver supports the GENI based i2c hardware controller in the
> Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable
> module supporting a wide range of serial interfaces including I2C. The
> driver supports FIFO mode and DMA mode of transfer and switches modes
> dynamically depending on the size of the transfer.
> 
> Signed-off-by: Karthikeyan Ramasubramanian <kramasub@...eaurora.org>
> Signed-off-by: Sagar Dharia <sdharia@...eaurora.org>
> Signed-off-by: Girish Mahadevan <girishm@...eaurora.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Looks good except one minor thing:

> +	pm_runtime_set_suspended(gi2c->se.dev);
> +	pm_runtime_set_autosuspend_delay(gi2c->se.dev, I2C_AUTO_SUSPEND_DELAY);
> +	pm_runtime_use_autosuspend(gi2c->se.dev);
> +	pm_runtime_enable(gi2c->se.dev);
> +	i2c_add_adapter(&gi2c->adap);
> +
> +	return 0;

i2c_add_adapter can fail. So, I'd guess you want to check the return
value and move it above the pm_runtime calls?


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