linux-kernel - [PATCH 2/6] clk: stm32f4: SDIO & 48Mhz clock management for STM32F469 board

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Date:   Mon, 7 Nov 2016 14:05:39 +0100
From:   <gabriel.fernandez@...com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nicolas Pitre <nico@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        <daniel.thompson@...aro.org>, <andrea.merello@...il.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <kernel@...inux.com>, <gabriel.fernandez@...com>,
        <ludovic.barre@...com>, <olivier.bideau@...com>,
        <amelie.delaunay@...com>
Subject: [PATCH 2/6] clk: stm32f4: SDIO & 48Mhz clock management for STM32F469 board

From: Gabriel Fernandez <gabriel.fernandez@...com>

In the stm32f469 soc, the 48Mhz clock could be derived from pll-q or
from pll-sai-p.

The SDIO clock could be also derived from 48Mhz or from sys clock.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
---
 drivers/clk/clk-stm32f4.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 7641acd..dda15bc 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -199,7 +199,7 @@ struct stm32f4_gate_data {
 	{ STM32F4_RCC_APB2ENR,  8,	"adc1",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR,  9,	"adc2",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 10,	"adc3",		"apb2_div" },
-	{ STM32F4_RCC_APB2ENR, 11,	"sdio",		"pll48" },
+	{ STM32F4_RCC_APB2ENR, 11,	"sdio",		"sdmux" },
 	{ STM32F4_RCC_APB2ENR, 12,	"spi1",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 13,	"spi4",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 14,	"syscfg",	"apb2_div" },
@@ -940,6 +940,10 @@ static struct clk_hw *stm32_register_cclk(struct device *dev, const char *name,
 	"no-clock", "lse", "lsi", "hse-rtc"
 };
 
+static const char *pll48_parents[2] = { "pll-q", "pllsai-p" };
+
+static const char *sdmux_parents[2] = { "pll48", "sys" };
+
 struct stm32f4_clk_data {
 	const struct stm32f4_gate_data *gates_data;
 	const u64 *gates_map;
@@ -1109,6 +1113,18 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 		goto fail;
 	}
 
+	if (of_device_is_compatible(np, "st,stm32f469-rcc")) {
+		clk_hw_register_mux_table(NULL, "pll48",
+				pll48_parents, ARRAY_SIZE(pll48_parents), 0,
+				base + STM32F4_RCC_DCKCFGR, 27, 1, 0, NULL,
+				&stm32f4_clk_lock);
+
+		clk_hw_register_mux_table(NULL, "sdmux",
+				sdmux_parents, ARRAY_SIZE(sdmux_parents), 0,
+				base + STM32F4_RCC_DCKCFGR, 28, 1, 0, NULL,
+				&stm32f4_clk_lock);
+	}
+
 	of_clk_add_hw_provider(np, stm32f4_rcc_lookup_clk, NULL);
 	return;
 fail:
-- 
1.9.1