PM / AVS: SmartReflex: use omap_sr * for minmax interfaces

SmartReflex driver interface is natively divided to two parts:

- external SmartReflex interface
- interface between SmartReflex driver and SmartReflex Class

Functions which belong to AVS class interface can use
struct omap_sr* instead of struct voltatedomain*, to provide a
direct connection between SR driver and SR class. This allows
us to optimize and not do additional lookups where none is
required.

sr_configure_minmax() is interface function between SR driver
and SR class. It is typically used by Class driver to
configure MINMAXAVG module inside SmartReflex module.
Now it takes struct omap_sr* as input parameter.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>

drivers/power/avs/smartreflex.c

@@ -465,9 +465,9 @@ int sr_disable_errgen(struct omap_sr *sr)
 }
 
 /**
- * sr_configure_minmax() - Configures the smrtreflex to perform AVS using the
+ * sr_configure_minmax() - Configures the SmartReflex to perform AVS using the
  *			 minmaxavg module.
- * @voltdm:	VDD pointer to which the SR module to be configured belongs to.
+ * @sr:			SR module to be configured.
  *
  * This API is to be called from the smartreflex class driver to
  * configure the minmaxavg module inside the smartreflex module.
@@ -476,16 +476,16 @@ int sr_disable_errgen(struct omap_sr *sr)
  * SR CLASS 2 can choose between ERROR module and MINMAXAVG
  * module. Returns 0 on success and error value in case of failure.
  */
-int sr_configure_minmax(struct voltagedomain *voltdm)
+int sr_configure_minmax(struct omap_sr *sr)
 {
 	u32 sr_config, sr_avgwt;
 	u32 senp_en = 0, senn_en = 0;
 	u8 senp_shift, senn_shift;
-	struct omap_sr *sr = _sr_lookup(voltdm);
 
-	if (IS_ERR(sr)) {
-		pr_warning("%s: omap_sr struct for voltdm not found\n",	__func__);
-		return PTR_ERR(sr);
+	if (!sr) {
+		pr_warn("%s: NULL omap_sr from %pF\n", __func__,
+			(void *)_RET_IP_);
+		return -EINVAL;
 	}
 
 	if (!sr->clk_length)

include/linux/power/smartreflex.h

@@ -303,7 +303,7 @@ int sr_enable(struct voltagedomain *voltdm, unsigned long volt);
 void sr_disable(struct voltagedomain *voltdm);
 int sr_configure_errgen(struct omap_sr *sr);
 int sr_disable_errgen(struct omap_sr *sr);
-int sr_configure_minmax(struct voltagedomain *voltdm);
+int sr_configure_minmax(struct omap_sr *sr);
 
 /* API to register the smartreflex class driver with the smartreflex driver */
 int sr_register_class(struct omap_sr_class_data *class_data);