Re: [RFC RFT PATCH v4 1/4] gpiolib: Pass bitmaps, not integer arrays, to get/set array

Peter Rosin
2018-08-21T06:52:54Z

Sorry for replying to self...

On 2018-08-21 08:49, Peter Rosin wrote:
> On 2018-08-21 01:43, Janusz Krzysztofik wrote:
>> Most users of get/set array functions iterate consecutive bits of data,
>> usually a single integer, while or processing array of results obtained
>> from or building an array of values to be passed to those functions.
>> Save time wasted on those iterations by changing the functions' API to
>> accept bitmaps.
>>
>> All current users are updated as well.
>>
>> More benefits from the change are expected as soon as planned support
>> for accepting/passing those bitmaps directly from/to respective GPIO
>> chip callbacks if applicable is implemented.
>>
>> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
>> ---
>> Documentation/driver-api/gpio/consumer.rst | 22 ++++----
>> drivers/auxdisplay/hd44780.c | 52 +++++++++--------
>> drivers/bus/ts-nbus.c | 19 ++-----
>> drivers/gpio/gpio-max3191x.c | 17 +++---
>> drivers/gpio/gpiolib.c | 86 +++++++++++++++--------------
>> drivers/gpio/gpiolib.h | 4 +-
>> drivers/i2c/muxes/i2c-mux-gpio.c | 3 +-
>> drivers/mmc/core/pwrseq_simple.c | 13 ++---
>> drivers/mux/gpio.c | 4 +-
>> drivers/net/phy/mdio-mux-gpio.c | 3 +-
>> drivers/pcmcia/soc_common.c | 11 ++--
>> drivers/phy/motorola/phy-mapphone-mdm6600.c | 17 +++---
>> drivers/staging/iio/adc/ad7606.c | 9 +--
>> drivers/tty/serial/serial_mctrl_gpio.c | 7 ++-
>> include/linux/gpio/consumer.h | 18 +++---
>> 15 files changed, 138 insertions(+), 147 deletions(-)
>>
>
> *snip*
>
>> diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
>> index 401308e3d036..d675e0ca2fa4 100644
>> --- a/drivers/i2c/muxes/i2c-mux-gpio.c
>> +++ b/drivers/i2c/muxes/i2c-mux-gpio.c
>> @@ -27,13 +27,14 @@ struct gpiomux {
>>
>> static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
>> {
>> + unsigned long value_bitmap[1] = { val, };
>> int i;
>>
>> for (i = 0; i < mux->data.n_gpios; i++)
>> mux->values[i] = (val >> i) & 1;
>>
>> gpiod_set_array_value_cansleep(mux->data.n_gpios,
>> - mux->gpios, mux->values);
>> + mux->gpios, value_bitmap);
>> }
>>
>> static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
>
> Please take the opportunity to completely get rid of the values member
> in struct mux_gpio. It no longer serves any purpose.

struct gpiomux

>
> *snip*
>
>> diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
>> index 6fdd9316db8b..cc2d5f50472a 100644
>> --- a/drivers/mux/gpio.c
>> +++ b/drivers/mux/gpio.c
>> @@ -23,14 +23,14 @@ struct mux_gpio {
>> static int mux_gpio_set(struct mux_control *mux, int state)
>> {
>> struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
>> + unsigned long value_bitmap[1] = { state, };
>> int i;
>>
>> for (i = 0; i < mux_gpio->gpios->ndescs; i++)
>> mux_gpio->val[i] = (state >> i) & 1;
>>
>> gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
>> - mux_gpio->gpios->desc,
>> - mux_gpio->val);
>> + mux_gpio->gpios->desc, value_bitmap);
>>
>> return 0;
>> }
>
> Dito (but the member name is val).

Here is where struct mux_gpio fits.

Cheers,
Peter

>
> *snip*
>
> Cheers,
> Peter
>