clk: qcom: gcc-ipq6018: add QUP6 I2C clock

QUP6 I2C clock is listed in the dt bindings but it was never included in
the GCC driver.
So lets add support for it, it is marked as criticial as it is used by RPM
to communicate to the external PMIC over I2C so this clock must not be
disabled.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231021115545.229060-1-robimarko@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

drivers/clk/qcom/gcc-ipq6018.c

@@ -2125,6 +2125,26 @@ static struct clk_branch gcc_blsp1_qup5_spi_apps_clk = {
 	},
 };
 
+static struct clk_branch gcc_blsp1_qup6_i2c_apps_clk = {
+	.halt_reg = 0x07010,
+	.clkr = {
+		.enable_reg = 0x07010,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data){
+			.name = "gcc_blsp1_qup6_i2c_apps_clk",
+			.parent_hws = (const struct clk_hw *[]){
+					&blsp1_qup6_i2c_apps_clk_src.clkr.hw },
+			.num_parents = 1,
+			/*
+			 * RPM uses QUP6 I2C to communicate with the external
+			 * PMIC so it must not be disabled.
+			 */
+			.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
 static struct clk_branch gcc_blsp1_qup6_spi_apps_clk = {
 	.halt_reg = 0x0700c,
 	.clkr = {
@@ -4281,6 +4301,7 @@ static struct clk_regmap *gcc_ipq6018_clks[] = {
 	[GCC_BLSP1_QUP4_SPI_APPS_CLK] = &gcc_blsp1_qup4_spi_apps_clk.clkr,
 	[GCC_BLSP1_QUP5_I2C_APPS_CLK] = &gcc_blsp1_qup5_i2c_apps_clk.clkr,
 	[GCC_BLSP1_QUP5_SPI_APPS_CLK] = &gcc_blsp1_qup5_spi_apps_clk.clkr,
+	[GCC_BLSP1_QUP6_I2C_APPS_CLK] = &gcc_blsp1_qup6_i2c_apps_clk.clkr,
 	[GCC_BLSP1_QUP6_SPI_APPS_CLK] = &gcc_blsp1_qup6_spi_apps_clk.clkr,
 	[GCC_BLSP1_UART1_APPS_CLK] = &gcc_blsp1_uart1_apps_clk.clkr,
 	[GCC_BLSP1_UART2_APPS_CLK] = &gcc_blsp1_uart2_apps_clk.clkr,