[PATCH 2/2] clk: qcom: gcc-msm8660: register PLL4_VOTE for LPASS

[Herman van Hazendonk <github.com@herrie.org>]

Add the CPU-side software vote register for LPASS PLL4. PLL4 itself
lives in the LCC (Low Power Audio Subsystem clock controller); GCC
holds the apps-processor vote in PLL_ENA_SC0 (0x34c0) BIT(4). The
LCC driver references "pll4" as the parent of its slimbus / SAIF /
audio mclk roots, so without this vote PLL4 is gated off when the
apps processor is the only consumer and LCC clocks silently fail to
enable.

Expose it as a single clk_regmap with clk_pll_vote_ops and append
the dt-binding ID at the next free slot (258) after the existing
PLL12 (257), so DT ABI for boards already using the prior header is
preserved.

Signed-off-by: Herman van Hazendonk <github.com@herrie.org>
---
 drivers/clk/qcom/gcc-msm8660.c               | 15 +++++++++++++++
 include/dt-bindings/clock/qcom,gcc-msm8660.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/drivers/clk/qcom/gcc-msm8660.c b/drivers/clk/qcom/gcc-msm8660.c
index e81b8851a786..cd392e140e95 100644
--- a/drivers/clk/qcom/gcc-msm8660.c
+++ b/drivers/clk/qcom/gcc-msm8660.c
@@ -54,6 +54,20 @@ static struct clk_regmap pll8_vote = {
 	},
 };
 
+/* PLL4 is the LPASS PLL, defined in LCC. This is the voting clock. */
+static struct clk_regmap pll4_vote = {
+	.enable_reg = 0x34c0,
+	.enable_mask = BIT(4),
+	.hw.init = &(struct clk_init_data){
+		.name = "pll4_vote",
+		.parent_data = &(const struct clk_parent_data){
+			.fw_name = "pll4", .name = "pll4",
+		},
+		.num_parents = 1,
+		.ops = &clk_pll_vote_ops,
+	},
+};
+
 enum {
 	P_PXO,
 	P_PLL8,
@@ -2543,6 +2557,7 @@ static struct clk_branch rpm_msg_ram_h_clk = {
 static struct clk_regmap *gcc_msm8660_clks[] = {
 	[PLL8] = &pll8.clkr,
 	[PLL8_VOTE] = &pll8_vote,
+	[PLL4_VOTE] = &pll4_vote,
 	[GSBI1_UART_SRC] = &gsbi1_uart_src.clkr,
 	[GSBI1_UART_CLK] = &gsbi1_uart_clk.clkr,
 	[GSBI2_UART_SRC] = &gsbi2_uart_src.clkr,
diff --git a/include/dt-bindings/clock/qcom,gcc-msm8660.h b/include/dt-bindings/clock/qcom,gcc-msm8660.h
index 4777c002711a..51d2e97441c8 100644
--- a/include/dt-bindings/clock/qcom,gcc-msm8660.h
+++ b/include/dt-bindings/clock/qcom,gcc-msm8660.h
@@ -264,5 +264,6 @@
 #define PLL10					255
 #define PLL11					256
 #define PLL12					257
+#define PLL4_VOTE				258
 
 #endif
-- 
2.43.0