linux-kernel - [PATCH v2] clk: qcom: gcc-ipq6018: add QUP6 I2C clock

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Message-ID: <20231021115545.229060-1-robimarko@gmail.com>
Date:   Sat, 21 Oct 2023 13:55:18 +0200
From:   Robert Marko <robimarko@...il.com>
To:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Robert Marko <robimarko@...il.com>,
        Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
Subject: [PATCH v2] 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@...il.com>
Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
---
Changes in v2:
* Mark the clock as critical
* Add comment as to why its marked as critical
* Update commit description thanks for explanation from Kathiravan

 drivers/clk/qcom/gcc-ipq6018.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/clk/qcom/gcc-ipq6018.c b/drivers/clk/qcom/gcc-ipq6018.c
index aa94fcb1e4aa5..e24c2c2c0db71 100644
--- a/drivers/clk/qcom/gcc-ipq6018.c
+++ b/drivers/clk/qcom/gcc-ipq6018.c
@@ -2118,6 +2118,26 @@ 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 = {
@@ -4274,6 +4294,7 @@ 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,
-- 
2.41.0