[PATCH v2 1/3] clk: qcom: gdsc: Add support for ALWAYS_ON gdscs

[Rajendra Nayak <rnayak@codeaurora.org>]

Some GDSCs might have software control to turn them off, but we might
want to keep them enabled always, in some cases because of lack of
support in kernel to handle a graceful turning off/on of such GDSCs.
Most common instances would be the GDCSs which power up the noc/bus
fabrics, which need bus drivers to handle them and atleast support for
which is missing on all qcom SoCs.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
---
 drivers/clk/qcom/gdsc.c | 8 ++++++++
 drivers/clk/qcom/gdsc.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index a4f3580587b7..15f4bb5efd68 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -291,6 +291,14 @@ static int gdsc_init(struct gdsc *sc)
 	if ((sc->flags & VOTABLE) && on)
 		gdsc_enable(&sc->pd);
 
+	/* If ALWAYS_ON GDSCs are not ON, turn them ON */
+	if (sc->flags & ALWAYS_ON) {
+		if (!on)
+			gdsc_enable(&sc->pd);
+		on = true;
+		sc->pd.flags |= GENPD_FLAG_ALWAYS_ON;
+	}
+
 	if (on || (sc->pwrsts & PWRSTS_RET))
 		gdsc_force_mem_on(sc);
 	else
diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
index 39648348e5ec..7fd78cec7e5b 100644
--- a/drivers/clk/qcom/gdsc.h
+++ b/drivers/clk/qcom/gdsc.h
@@ -53,6 +53,7 @@ struct gdsc {
 #define VOTABLE		BIT(0)
 #define CLAMP_IO	BIT(1)
 #define HW_CTRL		BIT(2)
+#define ALWAYS_ON	BIT(3)
 	struct reset_controller_dev	*rcdev;
 	unsigned int			*resets;
 	unsigned int			reset_count;
-- 
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