clk: qcom: rcg2: Make hw_clk_ctrl toggleable

Certain SoCs use the HW_CLK_CTRL feature on some of the clocks they
host. This allows the clocks to be turned on automatically when a
downstream branch tries to change rate or config.

Make it togglable so that we can utilize this.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230517-topic-waipio-gpucc-v1-2-4f40e282af1d@linaro.org

drivers/clk/qcom/clk-rcg.h

@@ -141,6 +141,7 @@ extern const struct clk_ops clk_dyn_rcg_ops;
  * @clkr: regmap clock handle
  * @cfg_off: defines the cfg register offset from the CMD_RCGR + CFG_REG
  * @parked_cfg: cached value of the CFG register for parked RCGs
+ * @hw_clk_ctrl: whether to enable hardware clock control
  */
 struct clk_rcg2 {
 	u32			cmd_rcgr;
@@ -152,6 +153,7 @@ struct clk_rcg2 {
 	struct clk_regmap	clkr;
 	u8			cfg_off;
 	u32			parked_cfg;
+	bool			hw_clk_ctrl;
 };
 
 #define to_clk_rcg2(_hw) container_of(to_clk_regmap(_hw), struct clk_rcg2, clkr)

drivers/clk/qcom/clk-rcg2.c

@@ -325,6 +325,8 @@ static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f,
 	cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
 	if (rcg->mnd_width && f->n && (f->m != f->n))
 		cfg |= CFG_MODE_DUAL_EDGE;
+	if (rcg->hw_clk_ctrl)
+		cfg |= CFG_HW_CLK_CTRL_MASK;
 
 	*_cfg &= ~mask;
 	*_cfg |= cfg;