Re: [alsa-devel] Fwd: [PATCH 1/1] SPI : spi-pxa2xx : fix spi init of WM510205 codec via ACPI (resend)

[Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>]

On Thu, Aug 20, 2015 at 11:38:13AM +0200, Christian Hartmann wrote:
> Hi again,
> 
> >> in  arizona-spi I try to map these GPIOs, which I want to get in
> >> arizona-core: arizona_dev_init
> >>
> >> diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
> >> index 1e845f6..52872a0 100644
> >> --- a/drivers/mfd/arizona-spi.c
> >> +++ b/drivers/mfd/arizona-spi.c
> >> @@ -18,28 +18,58 @@
> >>  #include <linux/slab.h>
> >>  #include <linux/spi/spi.h>
> >>  #include <linux/of.h>
> >> +#include <linux/acpi.h>
> >>
> >>  #include <linux/mfd/arizona/core.h>
> >>
> >>  #include "arizona.h"
> >>
> >> +const struct acpi_gpio_params reset_gpio = { 1, 0, false};
> >> +const struct acpi_gpio_params ldoena_gpio = { 2, 0, false};
> >> +
> >> +const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
> >> +       { "reset_gpio", &reset_gpio, 1,},
> >> +       { "ldoena_gpio", &ldoena_gpio, 1},
> >
> > The correct names are "reset-gpios" and "ldoena-gpios". If you call
> >
> >         reset = devm_gpiod_get_optional(arizona->dev, "reset", GPIOD_OUT_LOW);
> >
> > GPIO core will look for "reset-gpios" and then "reset-gpio" not
> > "reset_gpio" so it will not find the mapping.
> 
> yes you are right, I had fixed it yesterday by changing the names.
> 
> +const struct acpi_gpio_params reset_gpios = { 1, 0, false};
> +const struct acpi_gpio_params ldoena_gpios = { 2, 0, false};
> +
> +const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
> +       { "reset-gpios", &reset_gpios, 1,},
> +       { "ldoena-gpios", &ldoena_gpios, 1},
> +       { },
> +};
> 
> 
> 
> Today I can see that the mapping is working as seen below.
> But for unknown reasons I got wrong values read
> via devm_gpiod_get_optional() in the arizona_dev_init ->
> arizona_of_get_core_pdata()
> 
> [    6.387993] pxa2xx-spi 80860F0E:00: no DMA channels available, using PIO
> [    6.389258] pxa2xx-spi 80860F0E:00: registered master spi32766 (dynamic)
> [    6.389416] spi spi-WM510205:00: 8333333 Hz actual, PIO
> [    6.389424] spi spi-WM510205:00: setup mode 0, 8 bits/w, 8000000 Hz max --> 0
> [    6.389567] spi spi-WM510205:00: checking WM510205 with bmp180
> [    6.389574] spi spi-WM510205:00: checking WM510205 with bmp181
> [    6.389578] spi spi-WM510205:00: modalias WM510205 in id_table not
> found, returns NULL
> [    6.405723] arizona spi-WM510205:00: arizona_acpi_get_type(), than
> via spi_get_device_id().
> [    6.405735] arizona spi-WM510205:00: arizona_acpi_get_type matched
> [    6.405740] arizona spi-WM510205:00: using 1 as type for arizona audio codec
> [    6.405744] arizona spi-WM510205:00: regmap set to wm5102_spi
> [    6.406557] arizona spi-WM510205:00: spi_irq = -1
> [    6.406565] arizona spi-WM510205:00: acpi_dev_add_driver_gpios
> arizona_acpi_gpios added done, 0
> [    6.406569] arizona spi-WM510205:00: arizona_spi_probe done,
> calling arizona_dev_init
> [    6.406574] arizona spi-WM510205:00: dev_set_drvdata done for 1
> [    6.406580] arizona spi-WM510205:00: GPIO lookup for consumer reset
> [    6.406585] arizona spi-WM510205:00: using ACPI for GPIO lookup
> [    6.406590] acpi WM510205:00: GPIO: looking up reset-gpios
> [    6.406597] acpi WM510205:00: GPIO: _DSD returned WM510205:00 3 1 0 0
> [    6.406673] acpi WM510205:00: GPIO: looking up 0 in _CRS
> [    6.406724] arizona spi-WM510205:00: GPIO lookup for consumer ldoena
> [    6.406729] arizona spi-WM510205:00: using ACPI for GPIO lookup
> [    6.406733] acpi WM510205:00: GPIO: looking up ldoena-gpios
> [    6.406739] acpi WM510205:00: GPIO: _DSD returned WM510205:00 3 2 0 0
> [    6.406790] acpi WM510205:00: GPIO: looking up 0 in _CRS
> [    6.406844] arizona spi-WM510205:00: arizona_of_get_core_pdata
> (ACPI) using irq_gpio GPIO = 146
> [    6.406850] arizona spi-WM510205:00: arizona_of_get_core_pdata
> (ACPI) using ldoena GPIO =  -185173228
> [    6.406855] arizona spi-WM510205:00: arizona_of_get_core_pdata
> (ACPI) using reset GPIO =  -184741840
> [    6.406859] arizona spi-WM510205:00: arizona_of_get_core_pdata for 1
> [    6.406864] arizona spi-WM510205:00: regcache_cache_only for 1 set
> [    6.406868] arizona spi-WM510205:00: added wm5102_core_supplies for 1
> [    6.407100] spi-WM510205:00 supply AVDD not found, using dummy regulator
> [    6.407131] spi-WM510205:00 supply DBVDD1 not found, using dummy regulator
> [    6.407162] LDO1: supplied by regulator-dummy
> [    6.407214] ------------[ cut here ]------------
> [    6.407226] WARNING: CPU: 0 PID: 472 at drivers/gpio/gpiolib.c:86
> gpio_to_desc+0xbb/0xd0()
> 
> 
> did I cast the values wrong?

devm_gpiod_get_optional() returns GPIO descriptor which should not be
cast to anything else. If you want to get the numberic value for
logging purposes you can call desc_to_gpio(desc) for the returned
descriptor.
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