linux-kernel - Re: [PATCH i2c-next v4 2/3] i2c: aspeed: Add 'timeout' DT property reading code

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Date:   Wed, 3 Oct 2018 09:49:41 +0200
From:   Joel Stanley <joel@....id.au>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Jeffery <andrew@...id.au>, linux-i2c@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jarkko.nikula@...ux.intel.com,
        James Feist <james.feist@...ux.intel.com>,
        Vernon Mauery <vernon.mauery@...ux.intel.com>
Subject: Re: [PATCH i2c-next v4 2/3] i2c: aspeed: Add 'timeout' DT property
 reading code

Hello Jae,

On Mon, 1 Oct 2018 at 22:28, Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com> wrote:
>
> This commit adds reading code of the 'timeout' DT property to set
> bus timeout value in adapter configuration. This value still
> can be configured through an I2C_TIMEOUT ioctl on cdev too.
>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
> ---
>  drivers/i2c/busses/i2c-aspeed.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index 8dc9161ced38..6d31f54a6653 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -885,6 +885,7 @@ static int aspeed_i2c_probe_bus(struct platform_device *pdev)
>         struct clk *parent_clk;
>         struct resource *res;
>         int irq, ret;
> +       u32 timeout_ms;
>
>         bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
>         if (!bus)
> @@ -918,6 +919,11 @@ static int aspeed_i2c_probe_bus(struct platform_device *pdev)
>                 bus->bus_frequency = 100000;
>         }
>
> +       ret = of_property_read_u32(pdev->dev.of_node, "timeout",
> +                                  &timeout_ms);
> +       if (ret)
> +               timeout_ms = 0; /* then adap.timeout will be set by i2c-core */

Is it possible to implement the parsing of this property in the i2c
core instead?