linux-kernel - Re: [PATCH] gpio: regmap: move struct gpio

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Date:   Tue, 2 Mar 2021 19:14:01 +0100
From:   Álvaro Fernández Rojas <noltari@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: regmap: move struct gpio_regmap definition

Hi Michael,

El 02/03/2021 a las 19:10, Michael Walle escribió:
> Hi,
> 
> Am 2021-03-02 19:06, schrieb Álvaro Fernández Rojas:
>> struct gpio_regmap should be declared in gpio/regmap.h.
>> This way other drivers can access the structure data when registering 
>> a gpio
>> regmap controller.
> 
> The intention was really to keep this private to the gpio-regmap
> driver. Why do you need to access to the properties?

I'm trying to add support for bcm63xx pin controllers, and Linus 
suggested that I could use gpio regmap instead of adding duplicated code.
However, I need to access gpio_chip inside gpio_regmap to call 
pinctrl_add_gpio_range() with gpio_chip.base.

> 
> -michael
> 
>> Fixes: ebe363197e52 ("gpio: add a reusable generic gpio_chip using 
>> regmap")
>> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
>> ---
>>  drivers/gpio/gpio-regmap.c  | 20 ------------------
>>  include/linux/gpio/regmap.h | 41 ++++++++++++++++++++++++++++++++++++-
>>  2 files changed, 40 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
>> index 5412cb3b0b2a..23b0a8572f53 100644
>> --- a/drivers/gpio/gpio-regmap.c
>> +++ b/drivers/gpio/gpio-regmap.c
>> @@ -11,26 +11,6 @@
>>  #include <linux/module.h>
>>  #include <linux/regmap.h>
>>
>> -struct gpio_regmap {
>> -    struct device *parent;
>> -    struct regmap *regmap;
>> -    struct gpio_chip gpio_chip;
>> -
>> -    int reg_stride;
>> -    int ngpio_per_reg;
>> -    unsigned int reg_dat_base;
>> -    unsigned int reg_set_base;
>> -    unsigned int reg_clr_base;
>> -    unsigned int reg_dir_in_base;
>> -    unsigned int reg_dir_out_base;
>> -
>> -    int (*reg_mask_xlate)(struct gpio_regmap *gpio, unsigned int base,
>> -                  unsigned int offset, unsigned int *reg,
>> -                  unsigned int *mask);
>> -
>> -    void *driver_data;
>> -};
>> -
>>  static unsigned int gpio_regmap_addr(unsigned int addr)
>>  {
>>      if (addr == GPIO_REGMAP_ADDR_ZERO)
>> diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
>> index ad76f3d0a6ba..ce2fc6e9b62b 100644
>> --- a/include/linux/gpio/regmap.h
>> +++ b/include/linux/gpio/regmap.h
>> @@ -4,13 +4,52 @@
>>  #define _LINUX_GPIO_REGMAP_H
>>
>>  struct device;
>> -struct gpio_regmap;
>>  struct irq_domain;
>>  struct regmap;
>>
>>  #define GPIO_REGMAP_ADDR_ZERO ((unsigned int)(-1))
>>  #define GPIO_REGMAP_ADDR(addr) ((addr) ? : GPIO_REGMAP_ADDR_ZERO)
>>
>> +/**
>> + * struct gpio_regmap - GPIO regmap controller
>> + * @parent:        The parent device
>> + * @regmap:        The regmap used to access the registers
>> + *            given, the name of the device is used
>> + * @gpio_chip:        GPIO chip controller
>> + * @ngpio_per_reg:    Number of GPIOs per register
>> + * @reg_stride:        (Optional) May be set if the registers (of the
>> + *            same type, dat, set, etc) are not consecutive.
>> + * @reg_dat_base:    (Optional) (in) register base address
>> + * @reg_set_base:    (Optional) set register base address
>> + * @reg_clr_base:    (Optional) clear register base address
>> + * @reg_dir_in_base:    (Optional) in setting register base address
>> + * @reg_dir_out_base:    (Optional) out setting register base address
>> + * @reg_mask_xlate:     (Optional) Translates base address and GPIO
>> + *            offset to a register/bitmask pair. If not
>> + *            given the default gpio_regmap_simple_xlate()
>> + *            is used.
>> + * @driver_data:    (Optional) driver-private data
>> + */
>> +struct gpio_regmap {
>> +    struct device *parent;
>> +    struct regmap *regmap;
>> +    struct gpio_chip gpio_chip;
>> +
>> +    int reg_stride;
>> +    int ngpio_per_reg;
>> +    unsigned int reg_dat_base;
>> +    unsigned int reg_set_base;
>> +    unsigned int reg_clr_base;
>> +    unsigned int reg_dir_in_base;
>> +    unsigned int reg_dir_out_base;
>> +
>> +    int (*reg_mask_xlate)(struct gpio_regmap *gpio, unsigned int base,
>> +                  unsigned int offset, unsigned int *reg,
>> +                  unsigned int *mask);
>> +
>> +    void *driver_data;
>> +};
>> +
>>  /**
>>   * struct gpio_regmap_config - Description of a generic regmap 
>> gpio_chip.
>>   * @parent:        The parent device

Best regards,
Álvaro.