linux-kernel - Re: [PATCH v3 09/22] i2c: tegra: Clean up probe function

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Date:   Thu, 3 Sep 2020 14:17:53 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 09/22] i2c: tegra: Clean up probe function

On Thu, Sep 3, 2020 at 3:54 AM Dmitry Osipenko <digetx@...il.com> wrote:
>
> The driver's probe function code is difficult to read and follow. This
> patch reorders code of the probe function, forming logical groups that are
> easy to work with. The clock and hardware initializations are factored
> out into separate functions in order to keep code clean and ease error
> unwinding.
>
> Driver now makes use of devm_platform_get_and_ioremap_resource() and
> platform_get_irq() which are replacing boilerplate parts of the code.
>
> The dev_err_probe() is now used for reset control retrieval because reset
> is now requested before clocks, and thus, BPMP driver that provides reset
> controls for newer SoCs may cause the probe defer.

> The error message of devm_request_irq() is removed because this function
> takes care of printing the message by itself.

I see no evidence of this.

...

> +       of_property_read_u32(np, "clock-frequency", &bus_clk_rate);
> +       i2c_dev->bus_clk_rate = bus_clk_rate;

Hmm... I dunno if Wolfram is going to implement a special helper
exactly for this. I remember we discussed that with him during v5.8
(?) times.

...

> +static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)

Hmm... Don't we have something like devm_clk_bulk_get_all() or so?

-- 
With Best Regards,
Andy Shevchenko