ASoC: Allow choice of ac97 gpio reset line

As the PXA27x series allow 2 gpios to reset the ac97 bus,
allow through platform data configuration the definition of
the correct gpio which will reset the AC97 bus.

This comes from a silicon defect on the PXA27x series, where
the gpio must be manually controlled in warm reset cases.

Signed-off-by: Robert Jarzmik <rjarzmik@free.fr>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/sound/pxa2xx-lib.h b/include/sound/pxa2xx-lib.h
index 2fd3d251d9a5..2c894b600e5b 100644
--- a/include/sound/pxa2xx-lib.h
+++ b/include/sound/pxa2xx-lib.h
@@ -42,4 +42,19 @@ extern int pxa2xx_ac97_hw_resume(void);
 extern int pxa2xx_ac97_hw_probe(struct platform_device *dev);
 extern void pxa2xx_ac97_hw_remove(struct platform_device *dev);
 
+/* AC97 platform_data */
+/**
+ * struct pxa2xx_ac97_platform_data - pxa ac97 platform data
+ * @reset_gpio: AC97 reset gpio (normally gpio113 or gpio95)
+ *              a -1 value means no gpio will be used for reset
+ *
+ * Platform data should only be specified for pxa27x CPUs where a silicon bug
+ * prevents correct operation of the reset line. If not specified, the default
+ * behaviour is to consider gpio 113 as the AC97 reset line, which is the
+ * default on most boards.
+ */
+struct pxa2xx_ac97_platform_data {
+        int reset_gpio;
+};
+
 #endif