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From: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Cc: tommaso.merciai@amarulasolutions.com,
	"Stefano Babic" <sbabic@denx.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"NXP i.MX U-Boot Team" <uboot-imx@nxp.com>,
	"Peng Fan" <peng.fan@nxp.com>, "Ye Li" <ye.li@nxp.com>,
	"Alice Guo" <alice.guo@nxp.com>,
	"Andrey Zhizhikin" <andrey.zhizhikin@leica-geosystems.com>,
	"Marek Vasut" <marex@denx.de>, "Marek Behún" <marek.behun@nic.cz>,
	u-boot@lists.denx.de
Subject: [PATCH v2 4/9] arm: imx: imx8mm: add enable_pwm_clk function
Date: Wed, 16 Mar 2022 16:27:40 +0100	[thread overview]
Message-ID: <20220316152746.47768-5-tommaso.merciai@amarulasolutions.com> (raw)
In-Reply-To: <20220316152746.47768-1-tommaso.merciai@amarulasolutions.com>

Add function enable_pwm_clk into in clock_imx8mm.c. This
function first configure, then enable pwm clock from clock control
register. The following configuration is used:

source(0) -> 24 MHz ref clock
div(0)    -> no division for this clock

References:
 - iMX8MMRM.pdf p 303

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
---
Changes since v1:
 - Fix enable_pwm_clk function implementation. Now is generic for all pwm clks

 arch/arm/mach-imx/imx8m/clock_imx8mm.c | 53 ++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mm.c b/arch/arm/mach-imx/imx8m/clock_imx8mm.c
index 49945faf2c..ffb9456607 100644
--- a/arch/arm/mach-imx/imx8m/clock_imx8mm.c
+++ b/arch/arm/mach-imx/imx8m/clock_imx8mm.c
@@ -313,6 +313,59 @@ void enable_usboh3_clk(unsigned int enable)
 	}
 }
 
+void enable_pwm_clk(u32 index, unsigned char enable)
+{
+	switch (index) {
+	case 0:
+		if (enable) {
+			clock_enable(CCGR_PWM1, false);
+			clock_set_target_val(PWM1_CLK_ROOT, CLK_ROOT_ON |
+						CLK_ROOT_SOURCE_SEL(0) |
+						CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV1));
+			clock_enable(CCGR_PWM1, true);
+		} else {
+			clock_enable(CCGR_PWM1, false);
+		}
+		return;
+	case 1:
+		if (enable) {
+			clock_enable(CCGR_PWM2, false);
+			clock_set_target_val(PWM2_CLK_ROOT, CLK_ROOT_ON |
+						CLK_ROOT_SOURCE_SEL(0) |
+						CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV1));
+			clock_enable(CCGR_PWM2, true);
+		} else {
+			clock_enable(CCGR_PWM2, false);
+		}
+		return;
+	case 2:
+		if (enable) {
+			clock_enable(CCGR_PWM3, false);
+			clock_set_target_val(PWM3_CLK_ROOT, CLK_ROOT_ON |
+						CLK_ROOT_SOURCE_SEL(0) |
+						CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV1));
+			clock_enable(CCGR_PWM3, true);
+		} else {
+			clock_enable(CCGR_PWM3, false);
+		}
+		return;
+	case 3:
+		if (enable) {
+			clock_enable(CCGR_PWM4, false);
+			clock_set_target_val(PWM4_CLK_ROOT, CLK_ROOT_ON |
+						CLK_ROOT_SOURCE_SEL(0) |
+						CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV1));
+			clock_enable(CCGR_PWM4, true);
+		} else {
+			clock_enable(CCGR_PWM4, false);
+		}
+		return;
+	default:
+		printf("Invalid pwm index\n");
+		return;
+	}
+}
+
 void init_uart_clk(u32 index)
 {
 	/*
-- 
2.25.1


  parent reply	other threads:[~2022-03-16 15:28 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-16 15:27 [PATCH v2 0/9] imx8mm: add pwm-imx backlight support Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 1/9] arch: mach-imx: imx8m: add pwm1/pwm2 base address Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 2/9] arch: mach-imx: imx8m: add pwm ctrl registers fields defines Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 3/9] arch: mach-imx: imx8m: add pwm_regs struct in imx-regs Tommaso Merciai
2022-03-16 15:27 ` Tommaso Merciai [this message]
2022-03-16 19:07   ` [PATCH v2 4/9] arm: imx: imx8mm: add enable_pwm_clk function Michael Nazzareno Trimarchi
2022-03-17  7:40     ` Tommaso Merciai
2022-03-16 20:54   ` Marek Vasut
2022-03-17  7:39     ` Tommaso Merciai
2022-03-17 11:58       ` Marek Vasut
2022-03-17 12:38         ` Tommaso Merciai
2022-03-17 12:44           ` Marek Vasut
2022-03-17 15:13           ` Tommaso Merciai
2022-03-17 15:31             ` Marek Vasut
2022-03-24 10:55               ` Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 5/9] imx8m: clock: " Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 6/9] configs: imx8mm_evk: add CONFIG_IMX6_PWM_PER_CLK config Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 7/9] imx8mm_evk: spl: enable pwm clock Tommaso Merciai
2022-03-16 23:55   ` Fabio Estevam
2022-03-17  0:48     ` Fabio Estevam
2022-03-17  7:34       ` Tommaso Merciai
2022-03-17 10:55         ` Fabio Estevam
2022-03-17 12:40           ` Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 8/9] arm: dts: imx8mm_evk: add pwm1/backlight support Tommaso Merciai
2022-03-16 15:27 ` [PATCH v2 9/9] configs: imx8mm_evk: add pwm backlight support Tommaso Merciai

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