linux-kernel - Re: [PATCH 04/49] regmap-irq: Introduce config registers for irq types

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Message-ID: <CAHp75VePD-ROfnFtwU33Jt_h9a-qBC0QwRQcQfgmEbyOV22CKA@mail.gmail.com>
Date:   Tue, 21 Jun 2022 11:22:03 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
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Subject: Re: [PATCH 04/49] regmap-irq: Introduce config registers for irq types

On Mon, Jun 20, 2022 at 10:08 PM Aidan MacDonald
<aidanmacdonald.0x0@...il.com> wrote:
>
> Config registers provide a more uniform approach to handling irq type
> registers. They are essentially an extension of the virtual registers
> used by the qcom-pm8008 driver.
>
> Config registers can be represented as a 2D array:
>
>     config_base[0]      reg0,0      reg0,1      reg0,2      reg0,3
>     config_base[1]      reg1,0      reg1,1      reg1,2      reg1,3
>     config_base[2]      reg2,0      reg2,1      reg2,2      reg2,3
>
> There are 'num_config_bases' base registers, each of which is used to
> address 'num_config_regs' registers. The addresses are calculated in
> the same way as for other bases. It is assumed that an irq's type is
> controlled by one column of registers; that column is identified by
> the irq's 'type_reg_offset'.
>
> The set_type_config() callback is responsible for updating the config
> register contents. It receives an array of buffers (each represents a
> row of registers) and the index of the column to update, along with
> the 'struct regmap_irq' description and requested irq type.
>
> Buffered values are written to registers in regmap_irq_sync_unlock().
> Note that the entire register contents are overwritten, which is a
> minor change in behavior from type registers via 'type_base'.

...

> +                       ret = regmap_write(map, reg, d->config_buf[i][j]);
> +                       if (ret != 0)

if (ret)

> +                               dev_err(d->map->dev,
> +                                       "Failed to write config %x: %d\n",
> +                                       reg, ret);
> +               }

...

> + * regmap_irq_set_type_config_simple() - Simple IRQ type configuration callback.

> + *

Redundant line.

...

> +               d->config_buf = kcalloc(chip->num_config_bases,
> +                                       sizeof(*d->config_buf), GFP_KERNEL);
> +               if (!d->config_buf)
> +                       goto err_alloc;
> +
> +               for (i = 0; i < chip->num_config_regs; i++) {
> +                       d->config_buf[i] = kcalloc(chip->num_config_regs,
> +                                                  sizeof(unsigned int),

Can it be sizeof(**d->config_buf) ?

> +                                                  GFP_KERNEL);
> +                       if (!d->config_buf[i])
> +                               goto err_alloc;
> +               }

-- 
With Best Regards,
Andy Shevchenko