linux-kernel - [RFC PATCH 09/11] clk: imx: cpu: add device tree support

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Message-Id: <20221231104736.12635-10-dario.binacchi@amarulasolutions.com>
Date:   Sat, 31 Dec 2022 11:47:34 +0100
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     tommaso.merciai@...rulasolutions.com,
        linux-amarula@...rulasolutions.com,
        Chen-Yu Tsai <wenst@...omium.org>, jagan@...rulasolutions.com,
        angelo@...rulasolutions.com, anthony@...rulasolutions.com,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Abel Vesa <abelvesa@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: [RFC PATCH 09/11] clk: imx: cpu: add device tree support

The patch, backwards compatible, extends the driver to initialize the
clock directly from the device tree.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 drivers/clk/imx/clk-cpu.c | 54 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/clk/imx/clk-cpu.c b/drivers/clk/imx/clk-cpu.c
index cb6ca4cf0535..28fb75c6ecea 100644
--- a/drivers/clk/imx/clk-cpu.c
+++ b/drivers/clk/imx/clk-cpu.c
@@ -106,3 +106,57 @@ struct clk_hw *imx_clk_hw_cpu(const char *name, const char *parent_name,
 	return hw;
 }
 EXPORT_SYMBOL_GPL(imx_clk_hw_cpu);
+
+/**
+ * of_imx_cpu_clk_setup - Setup function for imx low power gate
+ *                            clock
+ * @node:	device node for the clock
+ */
+static void __init of_imx_cpu_clk_setup(struct device_node *node)
+{
+	struct clk_hw *hw;
+	struct clk *parent_clk, *div, *mux, *pll, *step;
+	const char *name = node->name, *parent_name;
+
+	parent_clk = of_clk_get_by_name(node, "fck");
+	if (IS_ERR(parent_clk)) {
+		pr_err("failed to get parent clock for %pOFn\n", node);
+		return;
+	}
+
+	div = of_clk_get_by_name(node, "div-clk");
+	if (IS_ERR(div)) {
+		pr_err("failed to get div clock for %pOFn\n", node);
+		return;
+	}
+
+	mux = of_clk_get_by_name(node, "mux-clk");
+	if (IS_ERR(div)) {
+		pr_err("failed to get mux clock for %pOFn\n", node);
+		return;
+	}
+
+	pll = of_clk_get_by_name(node, "pll-clk");
+	if (IS_ERR(div)) {
+		pr_err("failed to get pll clock for %pOFn\n", node);
+		return;
+	}
+
+	step = of_clk_get_by_name(node, "step-clk");
+	if (IS_ERR(div)) {
+		pr_err("failed to get step clock for %pOFn\n", node);
+		return;
+	}
+
+	parent_name = __clk_get_name(parent_clk);
+	of_property_read_string(node, "clock-output-names", &name);
+
+	hw = imx_clk_hw_cpu(name, parent_name, div, mux, pll, step);
+	if (!IS_ERR(hw))
+		of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+
+	pr_debug("name: %s, parent: %s, div: %s, mux: %s, pll: %s, step: %s\n",
+		 name, parent_name, __clk_get_name(div), __clk_get_name(mux),
+		 __clk_get_name(pll), __clk_get_name(step));
+}
+CLK_OF_DECLARE(fsl_cpu_clk, "fsl,cpu-clock", of_imx_cpu_clk_setup);
-- 
2.32.0