linux-kernel - [PATCH 3/6] clk: stm32f4: Add post divisor for I2S & SAI PLLs and Add lcd-tft clock

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Date:   Mon, 7 Nov 2016 14:05:40 +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 3/6] clk: stm32f4: Add post divisor for I2S & SAI PLLs and Add lcd-tft clock

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

This patch adds post dividers of I2S & SAI PLLs.
These dividers are managed by a dedicated register (RCC_DCKCFGR).
The PLL should be off before a set rate.
This patch also introduces the lcd-tft clock.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
---
 drivers/clk/clk-stm32f4.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index dda15bc..5fa5d51 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -215,6 +215,7 @@ struct stm32f4_gate_data {
 enum {
 	SYSTICK, FCLK, CLK_LSI, CLK_LSE, CLK_HSE_RTC, CLK_RTC,
 	PLL_VCO_I2S, PLL_VCO_SAI,
+	CLK_LCD,
 	END_PRIMARY_CLK
 };
 
@@ -599,6 +600,9 @@ static struct clk_hw *clk_register_pll_div(const char *name,
 static const struct clk_div_table pll_divp_table[] = {
 	{ 0, 2 }, { 1, 4 }, { 2, 6 }, { 3, 8 },
 };
+static const struct clk_div_table pll_lcd_div_table[] = {
+	{ 0, 2 }, { 1, 4 }, { 2, 8 }, { 3, 16 },
+};
 
 /*
  * Decode current PLL state and (statically) model the state we inherit from
@@ -659,16 +663,35 @@ static struct clk_hw *stm32f4_rcc_register_pll(const char *pllsrc,
 		clk_register_pll_div(data->p_name, data->vco_name, 0, reg,
 				16, 2, 0, pll_divp_table, pll_hw, lock);
 
-	if (data->q_name)
+	if (data->q_name) {
 		clk_register_pll_div(data->q_name, data->vco_name, 0, reg,
 				24, 4, CLK_DIVIDER_ONE_BASED, NULL,
 				pll_hw, lock);
 
-	if (data->r_name)
+		if (data->pll_num == PLL_I2S)
+			clk_register_pll_div("plli2s-q-div", data->q_name,
+				0, base + STM32F4_RCC_DCKCFGR,
+				0, 5, 0, NULL, pll_hw, &stm32f4_clk_lock);
+
+		if (data->pll_num == PLL_SAI)
+			clk_register_pll_div("pllsai-q-div", data->q_name,
+				0, base + STM32F4_RCC_DCKCFGR,
+				8, 5, 0, NULL, pll_hw, &stm32f4_clk_lock);
+	}
+
+	if (data->r_name) {
 		clk_register_pll_div(data->r_name, data->vco_name, 0, reg,
 				28, 3, CLK_DIVIDER_ONE_BASED, NULL,  pll_hw,
 				lock);
 
+		if (data->pll_num == PLL_SAI)
+			clks[CLK_LCD] = clk_register_pll_div("lcd-tft",
+					data->r_name, CLK_SET_RATE_PARENT,
+					base + STM32F4_RCC_DCKCFGR, 16, 2, 0,
+					pll_lcd_div_table, pll_hw,
+					&stm32f4_clk_lock);
+	}
+
 	return pll_hw;
 }
 
-- 
1.9.1