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HSI: omap-ssi: add clk change support

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This adds support for frequency changes of the SSI
functional clock, which may occur due to DVFS.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-By: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Sebastian Reichel
2016-01-31 01:52:38 +01:00
parent 0fae198988
commit 4bcf741452
3 changed files with 89 additions and 0 deletions
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6
drivers/hsi/controllers/omap_ssi.h
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@@ -134,6 +134,8 @@ struct gdd_trn {
* @gdd_tasklet: bottom half for DMA transfers
* @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
* @lock: lock to serialize access to GDD
* @fck_nb: DVFS notfifier block
* @fck_rate: clock rate
* @loss_count: To follow if we need to restore context or not
* @max_speed: Maximum TX speed (Kb/s) set by the clients.
* @sysconfig: SSI controller saved context
@@ -151,6 +153,7 @@ struct omap_ssi_controller {
struct tasklet_struct gdd_tasklet;
struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH];
spinlock_t lock;
struct notifier_block fck_nb;
unsigned long fck_rate;
u32 loss_count;
u32 max_speed;
@@ -164,6 +167,9 @@ struct omap_ssi_controller {
#endif
};
void omap_ssi_port_update_fclk(struct hsi_controller *ssi,
struct omap_ssi_port *omap_port);
extern struct platform_driver ssi_port_pdriver;
#endif /* __LINUX_HSI_OMAP_SSI_H__ */