[PATCH v2] i2c: i2c-mux-gpio: update mux with gpiod_set_array_value_cansleep

Peter Rosin
2016-11-23T14:09:17Z

If the gpio controller supports it and the gpio lines are concentrated
to one gpio chip, the mux controller pins will get updated simultaneously.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/muxes/i2c-mux-gpio.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)

Sorry about any confusion with v1, it had another unrelated patch
underneath that made it hard to apply it. I had forgot about that
one...

Anyway, this version should be better. Sorry again.

Cheers,
Peter

diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index e5cf26eefa97..62d033a7adf2 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -21,15 +21,18 @@
struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
+ struct gpio_desc **gpios;
};

static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
{
+ int values[mux->data.n_gpios];
int i;

for (i = 0; i < mux->data.n_gpios; i++)
- gpio_set_value_cansleep(mux->gpio_base + mux->data.gpios[i],
- val & (1 << i));
+ values[i] = (val >> i) & 1;
+
+ gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, values);
}

static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -176,12 +179,14 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
if (!parent)
return -EPROBE_DEFER;

- muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values, 0, 0,
+ muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
+ mux->data.n_values * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
+ mux->gpios = muxc->priv;
muxc->priv = mux;

platform_set_drvdata(pdev, muxc);
@@ -219,10 +224,12 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
goto err_request_gpio;
}

+ gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
+ mux->gpios[i] = gpio_desc;
+
if (!muxc->mux_locked)
continue;

- gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
gpio_dev = &gpio_desc->gdev->dev;
muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
}
--
2.1.4