staging: omap-thermal: introduce clock feature flag

The clock to Bandgap module is SW controlled on some version of
OMAP silicon (OMAP44xx). But on OMAP54xx ES2.0
onwards this is HW-Auto controlled. Hence introduce a feature flag
to use/not-to-use SW enable/disable of BG clock.

Signed-off-by: Radhesh Fadnis <radhesh.fadnis@ti.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/omap-thermal/omap-bandgap.c

@@ -914,7 +914,9 @@ int omap_bandgap_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
 
 	bg_ptr->clk_rate = clk_rate;
-	clk_enable(bg_ptr->fclock);
+	if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
+		clk_enable(bg_ptr->fclock);
+
 
 	mutex_init(&bg_ptr->bg_mutex);
 	bg_ptr->dev = &pdev->dev;
@@ -982,7 +984,8 @@ int omap_bandgap_probe(struct platform_device *pdev)
 	return 0;
 
 disable_clk:
-	clk_disable(bg_ptr->fclock);
+	if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
+		clk_disable(bg_ptr->fclock);
 put_clks:
 	clk_put(bg_ptr->fclock);
 	clk_put(bg_ptr->div_clk);
@@ -1012,7 +1015,8 @@ int omap_bandgap_remove(struct platform_device *pdev)
 
 	omap_bandgap_power(bg_ptr, false);
 
-	clk_disable(bg_ptr->fclock);
+	if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
+		clk_disable(bg_ptr->fclock);
 	clk_put(bg_ptr->fclock);
 	clk_put(bg_ptr->div_clk);
 
@@ -1109,7 +1113,9 @@ static int omap_bandgap_suspend(struct device *dev)
 
 	err = omap_bandgap_save_ctxt(bg_ptr);
 	omap_bandgap_power(bg_ptr, false);
-	clk_disable(bg_ptr->fclock);
+
+	if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
+		clk_disable(bg_ptr->fclock);
 
 	return err;
 }
@@ -1118,7 +1124,9 @@ static int omap_bandgap_resume(struct device *dev)
 {
 	struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
 
-	clk_enable(bg_ptr->fclock);
+	if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
+		clk_enable(bg_ptr->fclock);
+
 	omap_bandgap_power(bg_ptr, true);
 
 	return omap_bandgap_restore_ctxt(bg_ptr);

drivers/staging/omap-thermal/omap-bandgap.h

@@ -384,6 +384,7 @@ struct omap_bandgap_data {
 #define OMAP_BANDGAP_FEATURE_MODE_CONFIG	(1 << 3)
 #define OMAP_BANDGAP_FEATURE_COUNTER		(1 << 4)
 #define OMAP_BANDGAP_FEATURE_POWER_SWITCH	(1 << 5)
+#define OMAP_BANDGAP_FEATURE_CLK_CTRL		(1 << 6)
 #define OMAP_BANDGAP_HAS(b, f)			\
 			((b)->conf->features & OMAP_BANDGAP_FEATURE_ ## f)
 	unsigned int			features;

drivers/staging/omap-thermal/omap4-thermal.c

@@ -69,6 +69,7 @@ omap4430_adc_to_temp[OMAP4430_ADC_END_VALUE - OMAP4430_ADC_START_VALUE + 1] = {
 /* OMAP4430 data */
 const struct omap_bandgap_data omap4430_data = {
 	.features = OMAP_BANDGAP_FEATURE_MODE_CONFIG |
+			OMAP_BANDGAP_FEATURE_CLK_CTRL |
 			OMAP_BANDGAP_FEATURE_POWER_SWITCH,
 	.fclock_name = "bandgap_fclk",
 	.div_ck_name = "bandgap_fclk",
@@ -207,6 +208,7 @@ const struct omap_bandgap_data omap4460_data = {
 			OMAP_BANDGAP_FEATURE_TALERT |
 			OMAP_BANDGAP_FEATURE_MODE_CONFIG |
 			OMAP_BANDGAP_FEATURE_POWER_SWITCH |
+			OMAP_BANDGAP_FEATURE_CLK_CTRL |
 			OMAP_BANDGAP_FEATURE_COUNTER,
 	.fclock_name = "bandgap_ts_fclk",
 	.div_ck_name = "div_ts_ck",
@@ -236,6 +238,7 @@ const struct omap_bandgap_data omap4470_data = {
 			OMAP_BANDGAP_FEATURE_TALERT |
 			OMAP_BANDGAP_FEATURE_MODE_CONFIG |
 			OMAP_BANDGAP_FEATURE_POWER_SWITCH |
+			OMAP_BANDGAP_FEATURE_CLK_CTRL |
 			OMAP_BANDGAP_FEATURE_COUNTER,
 	.fclock_name = "bandgap_ts_fclk",
 	.div_ck_name = "div_ts_ck",

drivers/staging/omap-thermal/omap5-thermal.c

@@ -260,7 +260,8 @@ const struct omap_bandgap_data omap5430_data = {
 	.features = OMAP_BANDGAP_FEATURE_TSHUT_CONFIG |
 			OMAP_BANDGAP_FEATURE_TALERT |
 			OMAP_BANDGAP_FEATURE_MODE_CONFIG |
-			OMAP_BANDGAP_FEATURE_COUNTER,
+			OMAP_BANDGAP_FEATURE_COUNTER |
+			OMAP_BANDGAP_FEATURE_CLK_CTRL,
 	.fclock_name = "ts_clk_div_ck",
 	.div_ck_name = "ts_clk_div_ck",
 	.conv_table = omap5430_adc_to_temp,