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drivers/cst816s: use gpio_is_valid where appropriate
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@ -89,12 +89,12 @@ int cst816s_init(cst816s_t *dev, const cst816s_params_t *params,
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dev->cb = cb;
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dev->cb_arg = arg;
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if (dev->params->reset != GPIO_UNDEF) {
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if (gpio_is_valid(dev->params->reset)) {
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gpio_init(dev->params->reset, GPIO_OUT);
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_cst816s_reset(dev);
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}
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if ((dev->params->irq != GPIO_UNDEF) && cb) {
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if (gpio_is_valid(dev->params->irq) && cb) {
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if (gpio_init_int(dev->params->irq, GPIO_IN,
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dev->params->irq_flank,
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_gpio_irq, dev) < 0) {
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