linux-kernel - [PATCH 3/6] soc: qcom: ocmem: make iface clock optional

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Message-Id: <20230506-msm8226-ocmem-v1-3-3e24e2724f01@z3ntu.xyz>
Date:   Sun, 07 May 2023 11:12:20 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Brian Masney <masneyb@...tation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Luca Weiss <luca@...tu.xyz>
Subject: [PATCH 3/6] soc: qcom: ocmem: make iface clock optional

Some platforms such as msm8226 do not have an iface clk. Since clk_bulk
APIs don't offer to a way to treat some clocks as optional simply add
core_clk and iface_clk members to our drvdata.

Signed-off-by: Luca Weiss <luca@...tu.xyz>
---
 drivers/soc/qcom/ocmem.c | 42 ++++++++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c
index a11a955a1327..6235065d3bc9 100644
--- a/drivers/soc/qcom/ocmem.c
+++ b/drivers/soc/qcom/ocmem.c
@@ -54,6 +54,8 @@ struct ocmem {
 	const struct ocmem_config *config;
 	struct resource *memory;
 	void __iomem *mmio;
+	struct clk *core_clk;
+	struct clk *iface_clk;
 	unsigned int num_ports;
 	unsigned int num_macros;
 	bool interleaved;
@@ -91,16 +93,6 @@ struct ocmem {
 #define OCMEM_PSGSC_CTL_MACRO2_MODE(val)	FIELD_PREP(0x00000700, (val))
 #define OCMEM_PSGSC_CTL_MACRO3_MODE(val)	FIELD_PREP(0x00007000, (val))
 
-#define OCMEM_CLK_CORE_IDX			0
-static struct clk_bulk_data ocmem_clks[] = {
-	{
-		.id = "core",
-	},
-	{
-		.id = "iface",
-	},
-};
-
 static inline void ocmem_write(struct ocmem *ocmem, u32 reg, u32 data)
 {
 	writel(data, ocmem->mmio + reg);
@@ -316,9 +308,15 @@ static int ocmem_dev_probe(struct platform_device *pdev)
 	ocmem->dev = dev;
 	ocmem->config = device_get_match_data(dev);
 
-	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(ocmem_clks), ocmem_clks);
-	if (ret)
-		return dev_err_probe(dev, ret, "Unable to get clocks\n");
+	ocmem->core_clk = devm_clk_get(dev, "core");
+	if (IS_ERR(ocmem->core_clk))
+		return dev_err_probe(dev, PTR_ERR(ocmem->core_clk),
+				     "Unable to get core clock\n");
+
+	ocmem->iface_clk = devm_clk_get_optional(dev, "iface");
+	if (IS_ERR(ocmem->iface_clk))
+		return dev_err_probe(dev, PTR_ERR(ocmem->iface_clk),
+				     "Unable to get iface clock\n");
 
 	ocmem->mmio = devm_platform_ioremap_resource_byname(pdev, "ctrl");
 	if (IS_ERR(ocmem->mmio))
@@ -333,11 +331,15 @@ static int ocmem_dev_probe(struct platform_device *pdev)
 	}
 
 	/* The core clock is synchronous with graphics */
-	WARN_ON(clk_set_rate(ocmem_clks[OCMEM_CLK_CORE_IDX].clk, 1000) < 0);
+	WARN_ON(clk_set_rate(ocmem->core_clk, 1000) < 0);
+
+	ret = clk_prepare_enable(ocmem->core_clk);
+	if (ret)
+		return dev_err_probe(ocmem->dev, ret, "Failed to enable core clock\n");
 
-	ret = clk_bulk_prepare_enable(ARRAY_SIZE(ocmem_clks), ocmem_clks);
+	ret = clk_prepare_enable(ocmem->iface_clk);
 	if (ret)
-		return dev_err_probe(ocmem->dev, ret, "Failed to enable clocks\n");
+		return dev_err_probe(ocmem->dev, ret, "Failed to enable iface clock\n");
 
 	if (qcom_scm_restore_sec_cfg_available()) {
 		dev_dbg(dev, "configuring scm\n");
@@ -396,13 +398,17 @@ static int ocmem_dev_probe(struct platform_device *pdev)
 	return 0;
 
 err_clk_disable:
-	clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
+	clk_disable_unprepare(ocmem->core_clk);
+	clk_disable_unprepare(ocmem->iface_clk);
 	return ret;
 }
 
 static int ocmem_dev_remove(struct platform_device *pdev)
 {
-	clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
+	struct ocmem *ocmem = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(ocmem->core_clk);
+	clk_disable_unprepare(ocmem->iface_clk);
 
 	return 0;
 }

-- 
2.40.1