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arch: Add support for i.MX PWM

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Adds definitions, devicetree entries and clock controller
configurations for PWM peripheral.

Signed-off-by: Diego Sueiro <diego.sueiro@gmail.com>
This commit is contained in:
Diego Sueiro 2018-07-07 17:51:10 +01:00 • committed by Maureen Helm
commit d99f6ada84
4 changed files with 144 additions and 0 deletions
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7
arch/arm/soc/nxp_imx/mcimx7_m4/Kconfig.defconfig.mcimx7_m4
View file

@ -50,6 +50,13 @@ config I2C_IMX
endif # I2C
if PWM
config PWM_IMX
def_bool y
endif # PWM
config DOMAIN_ID
int
default 1

59
arch/arm/soc/nxp_imx/mcimx7_m4/soc.c
View file

@ -155,6 +155,61 @@ static void nxp_mcimx7_i2c_config(void)
}
#endif /* CONFIG_I2C_IMX */
#ifdef CONFIG_PWM_IMX
static void nxp_mcimx7_pwm_config(void)
{
#ifdef CONFIG_PWM_1
/* We need to grasp board pwm exclusively */
RDC_SetPdapAccess(RDC, rdcPdapPwm1,
RDC_DOMAIN_PERM(CONFIG_DOMAIN_ID, RDC_DOMAIN_PERM_RW),
false, false);
/* Select clock derived from OSC clock(24M) */
CCM_UpdateRoot(CCM, ccmRootPwm1, ccmRootmuxPwmOsc24m, 0, 0);
/* Enable pwm clock */
CCM_EnableRoot(CCM, ccmRootPwm1);
CCM_ControlGate(CCM, ccmCcgrGatePwm1, ccmClockNeededAll);
#endif /* #ifdef CONFIG_PWM_1 */
#ifdef CONFIG_PWM_2
/* We need to grasp board pwm exclusively */
RDC_SetPdapAccess(RDC, rdcPdapPwm2,
RDC_DOMAIN_PERM(CONFIG_DOMAIN_ID, RDC_DOMAIN_PERM_RW),
false, false);
/* Select clock derived from OSC clock(24M) */
CCM_UpdateRoot(CCM, ccmRootPwm2, ccmRootmuxPwmOsc24m, 0, 0);
/* Enable pwm clock */
CCM_EnableRoot(CCM, ccmRootPwm2);
CCM_ControlGate(CCM, ccmCcgrGatePwm2, ccmClockNeededAll);
#endif /* #ifdef CONFIG_PWM_2 */
#ifdef CONFIG_PWM_3
/* We need to grasp board pwm exclusively */
RDC_SetPdapAccess(RDC, rdcPdapPwm3,
RDC_DOMAIN_PERM(CONFIG_DOMAIN_ID, RDC_DOMAIN_PERM_RW),
false, false);
/* Select clock derived from OSC clock(24M) */
CCM_UpdateRoot(CCM, ccmRootPwm3, ccmRootmuxPwmOsc24m, 0, 0);
/* Enable pwm clock */
CCM_EnableRoot(CCM, ccmRootPwm3);
CCM_ControlGate(CCM, ccmCcgrGatePwm3, ccmClockNeededAll);
#endif /* #ifdef CONFIG_PWM_3 */
#ifdef CONFIG_PWM_4
/* We need to grasp board pwm exclusively */
RDC_SetPdapAccess(RDC, rdcPdapPwm4,
RDC_DOMAIN_PERM(CONFIG_DOMAIN_ID, RDC_DOMAIN_PERM_RW),
false, false);
/* Select clock derived from OSC clock(24M) */
CCM_UpdateRoot(CCM, ccmRootPwm4, ccmRootmuxPwmOsc24m, 0, 0);
/* Enable pwm clock */
CCM_EnableRoot(CCM, ccmRootPwm4);
CCM_ControlGate(CCM, ccmCcgrGatePwm4, ccmClockNeededAll);
#endif /* #ifdef CONFIG_PWM_4 */
}
#endif /* CONFIG_PWM_IMX */
static int nxp_mcimx7_init(struct device *arg)
{
ARG_UNUSED(arg);
@ -177,6 +232,10 @@ static int nxp_mcimx7_init(struct device *arg)
nxp_mcimx7_i2c_config();
#endif /* CONFIG_I2C_IMX */
#ifdef CONFIG_PWM_IMX
nxp_mcimx7_pwm_config();
#endif /* CONFIG_PWM_IMX */
return 0;
}

36
dts/arm/nxp/nxp_imx7d_m4.dtsi
View file

@ -246,6 +246,42 @@
label = "I2C_4";
status = "disabled";
};
pwm1: pwm@30660000 {
compatible = "fsl,imx7d-pwm";
reg = <0x30660000 0x10000>;
interrupts = <81 0>;
prescaler = <0>;
label = "PWM_1";
status = "disabled";
};
pwm2: pwm@30670000 {
compatible = "fsl,imx7d-pwm";
reg = <0x30670000 0x10000>;
interrupts = <82 0>;
prescaler = <0>;
label = "PWM_2";
status = "disabled";
};
pwm3: pwm@30680000 {
compatible = "fsl,imx7d-pwm";
reg = <0x30680000 0x10000>;
interrupts = <83 0>;
prescaler = <0>;
label = "PWM_3";
status = "disabled";
};
pwm4: pwm@30690000 {
compatible = "fsl,imx7d-pwm";
reg = <0x30690000 0x10000>;
interrupts = <84 0>;
prescaler = <0>;
label = "PWM_4";
status = "disabled";
};
};
};

42
dts/bindings/pwm/fsl,imx7d-pwm.yaml Normal file
View file

@ -0,0 +1,42 @@
#
# Copyright (c) 2018, Diego Sueiro <diego.sueiro@gmail.com>
#
# SPDX-License-Identifier: Apache-2.0
#
---
title: i.MX7D PWM
id: fsl,imx7d-pwm
version: 0.1
description: >
This binding gives a base representation of the i.MX7D PWM
inherits:
!include pwm.yaml
properties:
compatible:
type: string
category: required
description: compatible strings
constraint: "fsl,imx7d-pwm"
reg:
type: array
description: mmio register space
generation: define
category: required
interrupts:
type: array
category: required
description: required interrupts
generation: define
prescaler:
type: int
category: required
description: Set the PWM prescale between 0 and 4096
generation: define
...