[PATCH] ASoC: simple-card: add bindings for amplifier support

[Mark Brown]

On Mon, Mar 07, 2022 at 11:29:23AM -0300, Alifer Moraes wrote:

> +	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
> +	if (IS_ERR(priv->pa_gpio)) {
> +		ret = PTR_ERR(priv->pa_gpio);
> +		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
> +		return ret;
> +	}

This would need to update the DT binding document.  It is not clear that
we can't just use the existing simple-amplifier binding here though?
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