[PATCH 00/16] Fix i.MXRT1020/50

[PATCH 00/16] Fix i.MXRT1020/50

[Giulio Benetti]

This patchset adds imx-gpt-timer driver that is supported by i.MXRT and also
a lot of other i.MX* SoCs. This driver is needed for i.MXRT SoC family that is
lacking at the moment the timer at all and that makes u-boot to fail running on
i.MXRT.
There are also some fixes in imxrt10*0-evk.dts and other minor fixed and
improvements.

Giulio Benetti (16):
  arm: imxrt: soc: make mpu regions generic
  timer: imx-gpt: Add timer support for i.MX SoCs family
  ARM: dts: imxrt1020: add alias to osc
  ARM: dts: imxrt1020: add gpt1 node
  ARM: dts: imxrt1020-evk: enable gpt1 timer
  ARM: dts: imxrt1020-evk: set gpt1 as tick-timer for u-boot
  ARM: dts: imxrt1020-evk-u-boot: make gpt1 present for SPL
  ARM: dts: imxrt1020-evk: add device_type = "memory" to memory node
  configs: imxrt1020-evk: enable imx gpt timer as tick-timer
  ARM: dts: imxrt1050: add alias to osc
  ARM: dts: imxrt1050: add gpt1 node
  ARM: dts: imxrt1050-evk: enable gpt1 timer
  ARM: dts: imxrt1050-evk: set gpt1 as tick-timer for u-boot
  ARM: dts: imxrt1050-evk-u-boot: make gpt1 present for SPL
  ARM: dts: imxrt1050-evk: add device_type = "memory" to memory node
  configs: imxrt1050-evk: enable imx gpt timer as tick-timer

 arch/arm/dts/imxrt1020-evk-u-boot.dtsi |   4 +
 arch/arm/dts/imxrt1020-evk.dts         |   6 +
 arch/arm/dts/imxrt1020.dtsi            |  10 +-
 arch/arm/dts/imxrt1050-evk-u-boot.dtsi |   4 +
 arch/arm/dts/imxrt1050-evk.dts         |   6 +
 arch/arm/dts/imxrt1050.dtsi            |  10 +-
 arch/arm/mach-imx/imxrt/soc.c          |   6 +-
 configs/imxrt1020-evk_defconfig        |   1 +
 configs/imxrt1050-evk_defconfig        |   1 +
 drivers/timer/Kconfig                  |   7 ++
 drivers/timer/Makefile                 |   1 +
 drivers/timer/imx-gpt-timer.c          | 162 +++++++++++++++++++++++++
 12 files changed, 213 insertions(+), 5 deletions(-)
 create mode 100644 drivers/timer/imx-gpt-timer.c

-- 
2.25.1

[PATCH 01/16] arm: imxrt: soc: make mpu regions generic

[Giulio Benetti]

This mpu handling works for every i.MXRT SoC that we have, so let's
generalize imxrt1050_region_config to imxrt_region_config.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/mach-imx/imxrt/soc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-imx/imxrt/soc.c b/arch/arm/mach-imx/imxrt/soc.c
index 8e7d15160d..c533f3554a 100644
--- a/arch/arm/mach-imx/imxrt/soc.c
+++ b/arch/arm/mach-imx/imxrt/soc.c
@@ -14,7 +14,7 @@ int arch_cpu_init(void)
 {
 	int i;
 
-	struct mpu_region_config imxrt1050_region_config[] = {
+	struct mpu_region_config imxrt_region_config[] = {
 		{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
 		  STRONG_ORDER, REGION_4GB },
 		{ PHYS_SDRAM, REGION_1, XN_DIS, PRIV_RW_USR_RW,
@@ -29,8 +29,8 @@ int arch_cpu_init(void)
 	 * the whole 4GB address space.
 	 */
 	disable_mpu();
-	for (i = 0; i < ARRAY_SIZE(imxrt1050_region_config); i++)
-		mpu_config(&imxrt1050_region_config[i]);
+	for (i = 0; i < ARRAY_SIZE(imxrt_region_config); i++)
+		mpu_config(&imxrt_region_config[i]);
 	enable_mpu();
 
 	return 0;
-- 
2.25.1

[PATCH 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Giulio Benetti]

This timer driver is using GPT Timer (General Purpose Timer) available
on almost all i.MX SoCs family. Since this driver is only meant to
provide u-boot's timer and counter, and most of the i.MX* SoCs use a
24Mhz crystal, let's only deal with that specific source.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[Giulio: added the driver's stub and handled peripheral clock prescaler
setting]
Signed-off-by: Jesse Taube <mr.bossman075@gmail.com>
[Jesse: added init, setting prescaler for 24Mhz support and enabling
timer]
---
 drivers/timer/Kconfig         |   7 ++
 drivers/timer/Makefile        |   1 +
 drivers/timer/imx-gpt-timer.c | 162 ++++++++++++++++++++++++++++++++++
 3 files changed, 170 insertions(+)
 create mode 100644 drivers/timer/imx-gpt-timer.c

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 80743a2551..ee81dfa776 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
 	  Select this to enable support for Microchip 64-bit periodic
 	  interval timer.
 
+config IMX_GPT_TIMER
+	bool "NXP i.MX GPT timer support"
+	depends on TIMER
+	help
+	  Select this to enable support for the timer found on
+	  NXP i.MX devices.
+
 endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index eb5c48cc6c..e214ba7268 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)	+= stm32_timer.o
 obj-$(CONFIG_X86_TSC_TIMER)	+= tsc_timer.o
 obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
 obj-$(CONFIG_MCHP_PIT64B_TIMER)	+= mchp-pit64b-timer.o
+obj-$(CONFIG_IMX_GPT_TIMER)	+= imx-gpt-timer.o
diff --git a/drivers/timer/imx-gpt-timer.c b/drivers/timer/imx-gpt-timer.c
new file mode 100644
index 0000000000..a498f2e21c
--- /dev/null
+++ b/drivers/timer/imx-gpt-timer.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021
+ * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <timer.h>
+#include <dm/device_compat.h>
+
+#include <asm/io.h>
+
+#define GPT_CR_EN			BIT(0)
+#define GPT_CR_FRR			BIT(9)
+#define GPT_CR_EN_24M			BIT(10)
+#define GPT_CR_SWR			BIT(15)
+
+#define GPT_PR_PRESCALER24M_MASK	0x0000F000
+#define GPT_PR_PRESCALER24M_SHIFT	12
+#define GPT_PR_PRESCALER24M_MAX	(GPT_PR_PRESCALER24M_MASK >> GPT_PR_PRESCALER24M_SHIFT)
+#define GPT_PR_PRESCALER_MASK		0x00000FFF
+#define GPT_PR_PRESCALER_SHIFT		0
+#define GPT_PR_PRESCALER_MAX		(GPT_PR_PRESCALER_MASK >> GPT_PR_PRESCALER_SHIFT)
+
+#define GPT_CLKSRC_IPG_CLK		(1 << 6)
+#define GPT_CLKSRC_IPG_CLK_24M		(5 << 6)
+
+/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
+#ifndef CONFIG_SYS_HZ_CLOCK
+#define CONFIG_SYS_HZ_CLOCK		3000000
+#endif
+
+struct imx_gpt_timer_regs {
+	u32 cr;
+	u32 pr;
+	u32 sr;
+	u32 ir;
+	u32 ocr1;
+	u32 ocr2;
+	u32 ocr3;
+	u32 icr1;
+	u32 icr2;
+	u32 cnt;
+};
+
+struct imx_gpt_timer_priv {
+	struct imx_gpt_timer_regs *base;
+};
+
+static u64 imx_gpt_timer_get_count(struct udevice *dev)
+{
+	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
+	struct imx_gpt_timer_regs *regs = priv->base;
+
+	return readl(&regs->cnt);
+}
+
+static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
+{
+	u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
+
+	/* Reset the timer */
+	setbits_le32(&regs->cr, GPT_CR_SWR);
+
+	/* Wait for timer to finish reset */
+	while (readl(&regs->cr) & GPT_CR_SWR)
+		;
+
+	if (rate == 24000000UL) {
+		/* Set timer frequency if using 24M clock source */
+		if (prescaler > GPT_PR_PRESCALER24M_MAX)
+			return -EINVAL;
+
+		/* Set 24M prescaler */
+		writel((prescaler << GPT_PR_PRESCALER24M_SHIFT), &regs->pr);
+		/* Set Oscillator as clock source, enable 24M input and set gpt
+		 * in free-running mode
+		 */
+		writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M | GPT_CR_FRR, &regs->cr);
+	} else {
+		if (prescaler > GPT_PR_PRESCALER_MAX)
+			return -EINVAL;
+
+		/* Set prescaler */
+		writel((prescaler << GPT_PR_PRESCALER_SHIFT), &regs->pr);
+		/* Set Peripheral as clock source and set gpt in free-running
+		 * mode
+		 */
+		writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
+	}
+
+	/* Start timer */
+	setbits_le32(&regs->cr, GPT_CR_EN);
+
+	return 0;
+}
+
+static int imx_gpt_timer_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
+	struct imx_gpt_timer_regs *regs;
+	struct clk clk;
+	fdt_addr_t addr;
+	u32 clk_rate;
+	int ret;
+
+	addr = dev_read_addr(dev);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->base = (struct imx_gpt_timer_regs *)addr;
+	regs = priv->base;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_enable(&clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	/* Get timer clock rate */
+	clk_rate = clk_get_rate(&clk);
+	if (clk_rate <= 0) {
+		dev_err(dev, "Could not get clock rate...\n");
+		return -EINVAL;
+	}
+
+	ret = imx_gpt_setup(regs, clk_rate);
+	if (ret) {
+		dev_err(dev, "Could not setup timer\n");
+		return ret;
+	}
+
+	uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
+
+	return 0;
+}
+
+static const struct timer_ops imx_gpt_timer_ops = {
+	.get_count = imx_gpt_timer_get_count,
+};
+
+static const struct udevice_id imx_gpt_timer_ids[] = {
+	{ .compatible = "fsl,imxrt-gpt" },
+	{}
+};
+
+U_BOOT_DRIVER(imx_gpt_timer) = {
+	.name = "imx_gpt_timer",
+	.id = UCLASS_TIMER,
+	.of_match = imx_gpt_timer_ids,
+	.priv_auto = sizeof(struct imx_gpt_timer_priv),
+	.probe = imx_gpt_timer_probe,
+	.ops = &imx_gpt_timer_ops,
+};
-- 
2.25.1

[PATCH 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Giulio Benetti]

On 4/7/21 9:02 PM, Giulio Benetti wrote:
> This timer driver is using GPT Timer (General Purpose Timer) available
> on almost all i.MX SoCs family. Since this driver is only meant to
> provide u-boot's timer and counter, and most of the i.MX* SoCs use a
> 24Mhz crystal, let's only deal with that specific source.

Sorry, it's not true we deal 24Mhz only, also peripheral clock is dealt.
So commit log should be:
```
This timer driver is using GPT Timer (General Purpose Timer) available
on almost all i.MX SoCs family. This driver deals with both 24Mhz
oscillator as well as peripheral clock.
```

Let me know if I need to re-send.

Best regards
-- 
Giulio Benetti
Benetti Engineering sas

> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> [Giulio: added the driver's stub and handled peripheral clock prescaler
> setting]
> Signed-off-by: Jesse Taube <mr.bossman075@gmail.com>
> [Jesse: added init, setting prescaler for 24Mhz support and enabling
> timer]
> ---
>   drivers/timer/Kconfig         |   7 ++
>   drivers/timer/Makefile        |   1 +
>   drivers/timer/imx-gpt-timer.c | 162 ++++++++++++++++++++++++++++++++++
>   3 files changed, 170 insertions(+)
>   create mode 100644 drivers/timer/imx-gpt-timer.c
> 
> diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
> index 80743a2551..ee81dfa776 100644
> --- a/drivers/timer/Kconfig
> +++ b/drivers/timer/Kconfig
> @@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
>   	  Select this to enable support for Microchip 64-bit periodic
>   	  interval timer.
>   
> +config IMX_GPT_TIMER
> +	bool "NXP i.MX GPT timer support"
> +	depends on TIMER
> +	help
> +	  Select this to enable support for the timer found on
> +	  NXP i.MX devices.
> +
>   endmenu
> diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
> index eb5c48cc6c..e214ba7268 100644
> --- a/drivers/timer/Makefile
> +++ b/drivers/timer/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)	+= stm32_timer.o
>   obj-$(CONFIG_X86_TSC_TIMER)	+= tsc_timer.o
>   obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
>   obj-$(CONFIG_MCHP_PIT64B_TIMER)	+= mchp-pit64b-timer.o
> +obj-$(CONFIG_IMX_GPT_TIMER)	+= imx-gpt-timer.o
> diff --git a/drivers/timer/imx-gpt-timer.c b/drivers/timer/imx-gpt-timer.c
> new file mode 100644
> index 0000000000..a498f2e21c
> --- /dev/null
> +++ b/drivers/timer/imx-gpt-timer.c
> @@ -0,0 +1,162 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2021
> + * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <fdtdec.h>
> +#include <timer.h>
> +#include <dm/device_compat.h>
> +
> +#include <asm/io.h>
> +
> +#define GPT_CR_EN			BIT(0)
> +#define GPT_CR_FRR			BIT(9)
> +#define GPT_CR_EN_24M			BIT(10)
> +#define GPT_CR_SWR			BIT(15)
> +
> +#define GPT_PR_PRESCALER24M_MASK	0x0000F000
> +#define GPT_PR_PRESCALER24M_SHIFT	12
> +#define GPT_PR_PRESCALER24M_MAX	(GPT_PR_PRESCALER24M_MASK >> GPT_PR_PRESCALER24M_SHIFT)
> +#define GPT_PR_PRESCALER_MASK		0x00000FFF
> +#define GPT_PR_PRESCALER_SHIFT		0
> +#define GPT_PR_PRESCALER_MAX		(GPT_PR_PRESCALER_MASK >> GPT_PR_PRESCALER_SHIFT)
> +
> +#define GPT_CLKSRC_IPG_CLK		(1 << 6)
> +#define GPT_CLKSRC_IPG_CLK_24M		(5 << 6)
> +
> +/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
> +#ifndef CONFIG_SYS_HZ_CLOCK
> +#define CONFIG_SYS_HZ_CLOCK		3000000
> +#endif
> +
> +struct imx_gpt_timer_regs {
> +	u32 cr;
> +	u32 pr;
> +	u32 sr;
> +	u32 ir;
> +	u32 ocr1;
> +	u32 ocr2;
> +	u32 ocr3;
> +	u32 icr1;
> +	u32 icr2;
> +	u32 cnt;
> +};
> +
> +struct imx_gpt_timer_priv {
> +	struct imx_gpt_timer_regs *base;
> +};
> +
> +static u64 imx_gpt_timer_get_count(struct udevice *dev)
> +{
> +	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> +	struct imx_gpt_timer_regs *regs = priv->base;
> +
> +	return readl(&regs->cnt);
> +}
> +
> +static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
> +{
> +	u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
> +
> +	/* Reset the timer */
> +	setbits_le32(&regs->cr, GPT_CR_SWR);
> +
> +	/* Wait for timer to finish reset */
> +	while (readl(&regs->cr) & GPT_CR_SWR)
> +		;
> +
> +	if (rate == 24000000UL) {
> +		/* Set timer frequency if using 24M clock source */
> +		if (prescaler > GPT_PR_PRESCALER24M_MAX)
> +			return -EINVAL;
> +
> +		/* Set 24M prescaler */
> +		writel((prescaler << GPT_PR_PRESCALER24M_SHIFT), &regs->pr);
> +		/* Set Oscillator as clock source, enable 24M input and set gpt
> +		 * in free-running mode
> +		 */
> +		writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M | GPT_CR_FRR, &regs->cr);
> +	} else {
> +		if (prescaler > GPT_PR_PRESCALER_MAX)
> +			return -EINVAL;
> +
> +		/* Set prescaler */
> +		writel((prescaler << GPT_PR_PRESCALER_SHIFT), &regs->pr);
> +		/* Set Peripheral as clock source and set gpt in free-running
> +		 * mode
> +		 */
> +		writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
> +	}
> +
> +	/* Start timer */
> +	setbits_le32(&regs->cr, GPT_CR_EN);
> +
> +	return 0;
> +}
> +
> +static int imx_gpt_timer_probe(struct udevice *dev)
> +{
> +	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
> +	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> +	struct imx_gpt_timer_regs *regs;
> +	struct clk clk;
> +	fdt_addr_t addr;
> +	u32 clk_rate;
> +	int ret;
> +
> +	addr = dev_read_addr(dev);
> +	if (addr == FDT_ADDR_T_NONE)
> +		return -EINVAL;
> +
> +	priv->base = (struct imx_gpt_timer_regs *)addr;
> +	regs = priv->base;
> +
> +	ret = clk_get_by_index(dev, 0, &clk);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = clk_enable(&clk);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable clock\n");
> +		return ret;
> +	}
> +
> +	/* Get timer clock rate */
> +	clk_rate = clk_get_rate(&clk);
> +	if (clk_rate <= 0) {
> +		dev_err(dev, "Could not get clock rate...\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = imx_gpt_setup(regs, clk_rate);
> +	if (ret) {
> +		dev_err(dev, "Could not setup timer\n");
> +		return ret;
> +	}
> +
> +	uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
> +
> +	return 0;
> +}
> +
> +static const struct timer_ops imx_gpt_timer_ops = {
> +	.get_count = imx_gpt_timer_get_count,
> +};
> +
> +static const struct udevice_id imx_gpt_timer_ids[] = {
> +	{ .compatible = "fsl,imxrt-gpt" },
> +	{}
> +};
> +
> +U_BOOT_DRIVER(imx_gpt_timer) = {
> +	.name = "imx_gpt_timer",
> +	.id = UCLASS_TIMER,
> +	.of_match = imx_gpt_timer_ids,
> +	.priv_auto = sizeof(struct imx_gpt_timer_priv),
> +	.probe = imx_gpt_timer_probe,
> +	.ops = &imx_gpt_timer_ops,
> +};
> 

[PATCH 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Jesse T]

>
> > +     if (rate == 24000000UL) {
> > +             /* Set timer frequency if using 24M clock source */
> > +             if (prescaler > GPT_PR_PRESCALER24M_MAX)
> > +                     return -EINVAL;
> > +
>

In the datasheet for the imxrt1050 the 24Mhz scaler output goes into the
normal prescaler.The width of the 24Mhz prescaler is only 4 bits it seems
to be meant to divide the 24Mhz to something more reasonable for the other
prescaler.
I would do something like this...

+     if (rate == 24000000UL) {
+             /* Set timer frequency if using 24M clock source */
+             if (prescaler > (GPT_PR_PRESCALER24M_MAX  <<  12) |
GPT_PR_PRESCALER_MAX)
+                     return -EINVAL;
+
+               /* Set 24M prescaler */
+               writel(( (prescaler >> 12) << GPT_PR_PRESCALER24M_SHIFT),
&regs->pr);
+               writel(( (prescaler & GPT_PR_PRESCALER_MASK) <<
GPT_PR_PRESCALER_SHIFT), &regs->pr);

Ideally we would have the lengths in bits for GPT_PR_PRESCALER_MASK to
replace the 12, but we can also do...

+     if (rate == 24000000UL) {
+             /* Set timer frequency if using 24M clock source */
+             if (prescaler > (GPT_PR_PRESCALER24M_MASK |
GPT_PR_PRESCALER_MAX))
+                     return -EINVAL;
+
+               /* Set 24M prescaler */
+               writel(prescaler , &regs->pr);

Side note while debugging this i added `KCFLAGS=-DDEBUG` and the boot would
hang with it but without it would boot normally. The cause for the hang is
this loop will never exit, not this only happens while booting u-boot and
not during the spl stage.
 /drivers/serial/serial_lpuart.c
@@ -356,7 +356,9 @@ static void _lpuart32_serial_putc(struct
lpuart_serial_plat *plat,

  while (true) {
  lpuart_read32(plat->flags, &base->stat, &stat);

  if ((stat & STAT_TDRE))
  break;

Sorry if im being dumb im new to this stuff and thanks for every one for
walking me through this.


On Wed, Apr 7, 2021 at 3:20 PM Giulio Benetti <
giulio.benetti@benettiengineering.com> wrote:

> On 4/7/21 9:02 PM, Giulio Benetti wrote:
> > This timer driver is using GPT Timer (General Purpose Timer) available
> > on almost all i.MX SoCs family. Since this driver is only meant to
> > provide u-boot's timer and counter, and most of the i.MX* SoCs use a
> > 24Mhz crystal, let's only deal with that specific source.
>
> Sorry, it's not true we deal 24Mhz only, also peripheral clock is dealt.
> So commit log should be:
> ```
> This timer driver is using GPT Timer (General Purpose Timer) available
> on almost all i.MX SoCs family. This driver deals with both 24Mhz
> oscillator as well as peripheral clock.
> ```
>
> Let me know if I need to re-send.
>
> Best regards
> --
> Giulio Benetti
> Benetti Engineering sas
>
> > Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> > [Giulio: added the driver's stub and handled peripheral clock prescaler
> > setting]
> > Signed-off-by: Jesse Taube <mr.bossman075@gmail.com>
> > [Jesse: added init, setting prescaler for 24Mhz support and enabling
> > timer]
> > ---
> >   drivers/timer/Kconfig         |   7 ++
> >   drivers/timer/Makefile        |   1 +
> >   drivers/timer/imx-gpt-timer.c | 162 ++++++++++++++++++++++++++++++++++
> >   3 files changed, 170 insertions(+)
> >   create mode 100644 drivers/timer/imx-gpt-timer.c
> >
> > diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
> > index 80743a2551..ee81dfa776 100644
> > --- a/drivers/timer/Kconfig
> > +++ b/drivers/timer/Kconfig
> > @@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
> >         Select this to enable support for Microchip 64-bit periodic
> >         interval timer.
> >
> > +config IMX_GPT_TIMER
> > +     bool "NXP i.MX GPT timer support"
> > +     depends on TIMER
> > +     help
> > +       Select this to enable support for the timer found on
> > +       NXP i.MX devices.
> > +
> >   endmenu
> > diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
> > index eb5c48cc6c..e214ba7268 100644
> > --- a/drivers/timer/Makefile
> > +++ b/drivers/timer/Makefile
> > @@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)   += stm32_timer.o
> >   obj-$(CONFIG_X86_TSC_TIMER) += tsc_timer.o
> >   obj-$(CONFIG_MTK_TIMER)             += mtk_timer.o
> >   obj-$(CONFIG_MCHP_PIT64B_TIMER)     += mchp-pit64b-timer.o
> > +obj-$(CONFIG_IMX_GPT_TIMER)  += imx-gpt-timer.o
> > diff --git a/drivers/timer/imx-gpt-timer.c
> b/drivers/timer/imx-gpt-timer.c
> > new file mode 100644
> > index 0000000000..a498f2e21c
> > --- /dev/null
> > +++ b/drivers/timer/imx-gpt-timer.c
> > @@ -0,0 +1,162 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2021
> > + * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
> > + */
> > +
> > +#include <common.h>
> > +#include <clk.h>
> > +#include <dm.h>
> > +#include <fdtdec.h>
> > +#include <timer.h>
> > +#include <dm/device_compat.h>
> > +
> > +#include <asm/io.h>
> > +
> > +#define GPT_CR_EN                    BIT(0)
> > +#define GPT_CR_FRR                   BIT(9)
> > +#define GPT_CR_EN_24M                        BIT(10)
> > +#define GPT_CR_SWR                   BIT(15)
> > +
> > +#define GPT_PR_PRESCALER24M_MASK     0x0000F000
> > +#define GPT_PR_PRESCALER24M_SHIFT    12
> > +#define GPT_PR_PRESCALER24M_MAX      (GPT_PR_PRESCALER24M_MASK >>
> GPT_PR_PRESCALER24M_SHIFT)
> > +#define GPT_PR_PRESCALER_MASK                0x00000FFF
> > +#define GPT_PR_PRESCALER_SHIFT               0
> > +#define GPT_PR_PRESCALER_MAX         (GPT_PR_PRESCALER_MASK >>
> GPT_PR_PRESCALER_SHIFT)
> > +
> > +#define GPT_CLKSRC_IPG_CLK           (1 << 6)
> > +#define GPT_CLKSRC_IPG_CLK_24M               (5 << 6)
> > +
> > +/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
> > +#ifndef CONFIG_SYS_HZ_CLOCK
> > +#define CONFIG_SYS_HZ_CLOCK          3000000
> > +#endif
> > +
> > +struct imx_gpt_timer_regs {
> > +     u32 cr;
> > +     u32 pr;
> > +     u32 sr;
> > +     u32 ir;
> > +     u32 ocr1;
> > +     u32 ocr2;
> > +     u32 ocr3;
> > +     u32 icr1;
> > +     u32 icr2;
> > +     u32 cnt;
> > +};
> > +
> > +struct imx_gpt_timer_priv {
> > +     struct imx_gpt_timer_regs *base;
> > +};
> > +
> > +static u64 imx_gpt_timer_get_count(struct udevice *dev)
> > +{
> > +     struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> > +     struct imx_gpt_timer_regs *regs = priv->base;
> > +
> > +     return readl(&regs->cnt);
> > +}
> > +
> > +static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
> > +{
> > +     u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
> > +
> > +     /* Reset the timer */
> > +     setbits_le32(&regs->cr, GPT_CR_SWR);
> > +
> > +     /* Wait for timer to finish reset */
> > +     while (readl(&regs->cr) & GPT_CR_SWR)
> > +             ;
> > +
> > +     if (rate == 24000000UL) {
> > +             /* Set timer frequency if using 24M clock source */
> > +             if (prescaler > GPT_PR_PRESCALER24M_MAX)
> > +                     return -EINVAL;
> > +
> > +             /* Set 24M prescaler */
> > +             writel((prescaler << GPT_PR_PRESCALER24M_SHIFT),
> &regs->pr);
> > +             /* Set Oscillator as clock source, enable 24M input and
> set gpt
> > +              * in free-running mode
> > +              */
> > +             writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M |
> GPT_CR_FRR, &regs->cr);
> > +     } else {
> > +             if (prescaler > GPT_PR_PRESCALER_MAX)
> > +                     return -EINVAL;
> > +
> > +             /* Set prescaler */
> > +             writel((prescaler << GPT_PR_PRESCALER_SHIFT), &regs->pr);
> > +             /* Set Peripheral as clock source and set gpt in
> free-running
> > +              * mode
> > +              */
> > +             writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
> > +     }
> > +
> > +     /* Start timer */
> > +     setbits_le32(&regs->cr, GPT_CR_EN);
> > +
> > +     return 0;
> > +}
> > +
> > +static int imx_gpt_timer_probe(struct udevice *dev)
> > +{
> > +     struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
> > +     struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> > +     struct imx_gpt_timer_regs *regs;
> > +     struct clk clk;
> > +     fdt_addr_t addr;
> > +     u32 clk_rate;
> > +     int ret;
> > +
> > +     addr = dev_read_addr(dev);
> > +     if (addr == FDT_ADDR_T_NONE)
> > +             return -EINVAL;
> > +
> > +     priv->base = (struct imx_gpt_timer_regs *)addr;
> > +     regs = priv->base;
> > +
> > +     ret = clk_get_by_index(dev, 0, &clk);
> > +     if (ret < 0)
> > +             return ret;
> > +
> > +     ret = clk_enable(&clk);
> > +     if (ret) {
> > +             dev_err(dev, "Failed to enable clock\n");
> > +             return ret;
> > +     }
> > +
> > +     /* Get timer clock rate */
> > +     clk_rate = clk_get_rate(&clk);
> > +     if (clk_rate <= 0) {
> > +             dev_err(dev, "Could not get clock rate...\n");
> > +             return -EINVAL;
> > +     }
> > +
> > +     ret = imx_gpt_setup(regs, clk_rate);
> > +     if (ret) {
> > +             dev_err(dev, "Could not setup timer\n");
> > +             return ret;
> > +     }
> > +
> > +     uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
> > +
> > +     return 0;
> > +}
> > +
> > +static const struct timer_ops imx_gpt_timer_ops = {
> > +     .get_count = imx_gpt_timer_get_count,
> > +};
> > +
> > +static const struct udevice_id imx_gpt_timer_ids[] = {
> > +     { .compatible = "fsl,imxrt-gpt" },
> > +     {}
> > +};
> > +
> > +U_BOOT_DRIVER(imx_gpt_timer) = {
> > +     .name = "imx_gpt_timer",
> > +     .id = UCLASS_TIMER,
> > +     .of_match = imx_gpt_timer_ids,
> > +     .priv_auto = sizeof(struct imx_gpt_timer_priv),
> > +     .probe = imx_gpt_timer_probe,
> > +     .ops = &imx_gpt_timer_ops,
> > +};
> >
>
>

[PATCH 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Giulio Benetti]

Hi Jesse,

please use plain-text e-mail instead of html,

On 4/8/21 3:06 AM, Jesse T wrote:
>     > +? ? ?if (rate == 24000000UL) {
>     > +? ? ? ? ? ? ?/* Set timer frequency if using 24M clock source */
>     > +? ? ? ? ? ? ?if (prescaler > GPT_PR_PRESCALER24M_MAX)
>     > +? ? ? ? ? ? ? ? ? ? ?return -EINVAL;
>     > +
> 
> In the datasheet for the imxrt1050 the 24Mhz scaler output goes into the 
> normal prescaler.The width of the 24Mhz prescaler is only 4 bits it 
> seems to be meant to divide the 24Mhz to something?more reasonable?for 
> the other prescaler.

You're right, I've missed RM Figure 51-2 against 51-1, I was sure that 
Prescaler 24M was directly feeding the Timer Counter. Anyway I was 
trying to follow what they do in Linux kernel:
https://elixir.bootlin.com/linux/latest/source/drivers/clocksource/timer-imx-gpt.c#L314

What they try to do as I understand is to avoid using PLL if 3Mhz is the 
wished rate and the same I'm trying to do here. Then yes, you're right 
that main prescaler can divide again.

> I would do something like this...
> 
> +? ? ?if (rate == 24000000UL) {
> +? ? ? ? ? ? ?/* Set timer frequency if using 24M clock source */
> +? ? ? ? ? ? ?if (prescaler > (GPT_PR_PRESCALER24M_MAX? <<? 12) | 
> GPT_PR_PRESCALER_MAX)

I can't understand this check ^^^

> +? ? ? ? ? ? ? ? ? ? ?return -EINVAL;
> +
> +? ? ? ? ? ? ? ?/* Set 24M prescaler */
> +? ? ? ? ? ? ? ?writel(( (prescaler >> 12) << 
> GPT_PR_PRESCALER24M_SHIFT), &regs->pr);
> +? ? ? ? ? ? ? ?writel(( (prescaler & GPT_PR_PRESCALER_MASK) << 
> GPT_PR_PRESCALER_SHIFT), &regs->pr);

This way ^^^ you set the 2 in-series prescalers with the same value if 
it's what you mean.

> 
> Ideally?we would have the lengths in bits for?GPT_PR_PRESCALER_MASK to 
> replace the 12, but we can also do...
> 
> +? ? ?if (rate == 24000000UL) {
> +? ? ? ? ? ? ?/* Set timer frequency if using 24M clock source */
> +? ? ? ? ? ? ?if (prescaler > (GPT_PR_PRESCALER24M_MASK | 
> GPT_PR_PRESCALER_MAX))

Still don't understand this ^^^ with the 2 or'ed macros.

That gets expanded like:
```
if (prescaler > (GPT_PR_PRESCALER24M_MASK | ((GPT_PR_PRESCALER24M_MASK 
 >> GPT_PR_PRESCALER24M_SHIFT)))
```
and to:
```
if (prescaler > (0x0000F000 | (0x0000F000 >> 12)))
```
that results in:
```
if (prescaler > (0x0000F000 | 0xF))
```

so it doesn't make sense to me, maybe did you mean something different 
or I'm wrong while expanding?

> +? ? ? ? ? ? ? ? ? ? ?return -EINVAL;
> +
> +? ? ? ? ? ? ? ?/* Set 24M prescaler */
> +? ? ? ? ? ? ? ?writel(prescaler ,?&regs->pr);
> 
> Side note while debugging?this i added `KCFLAGS=-DDEBUG` and the boot 
> would hang with it but without it would boot normally. The cause for the 
> hang is this loop will never exit, not this only happens?while booting 
> u-boot?and not during the spl stage.
>  ?/drivers/serial/serial_lpuart.c
> @@ -356,7 +356,9 @@ static void _lpuart32_serial_putc(struct 
> lpuart_serial_plat *plat,
> 
>  ? while (true) {
>  ? lpuart_read32(plat->flags, &base->stat, &stat);
> 
>  ? if ((stat & STAT_TDRE))
>  ? break;

Thanks for recalling me this, I still didn't check it, so I'm going 
through this and fix it.

> Sorry if im being?dumb

You're not being dumb

im new to this stuff and thanks for every one for
> walking me through this.

You're welcome :-) and thank you for helping me with this driver and 
reviewing! Reviewing is a very important part of the process of 
upstreaming patches.

Kind regards
-- 
Giulio Benetti
Benetti Engineering sas

> 
> On Wed, Apr 7, 2021 at 3:20 PM Giulio Benetti 
> <giulio.benetti@benettiengineering.com 
> <mailto:giulio.benetti@benettiengineering.com>> wrote:
> 
>     On 4/7/21 9:02 PM, Giulio Benetti wrote:
>      > This timer driver is using GPT Timer (General Purpose Timer)
>     available
>      > on almost all i.MX SoCs family. Since this driver is only meant to
>      > provide u-boot's timer and counter, and most of the i.MX* SoCs use a
>      > 24Mhz crystal, let's only deal with that specific source.
> 
>     Sorry, it's not true we deal 24Mhz only, also peripheral clock is dealt.
>     So commit log should be:
>     ```
>     This timer driver is using GPT Timer (General Purpose Timer) available
>     on almost all i.MX SoCs family. This driver deals with both 24Mhz
>     oscillator as well as peripheral clock.
>     ```
> 
>     Let me know if I need to re-send.
> 
>     Best regards
>     -- 
>     Giulio Benetti
>     Benetti Engineering sas
> 
>      > Signed-off-by: Giulio Benetti
>     <giulio.benetti@benettiengineering.com
>     <mailto:giulio.benetti@benettiengineering.com>>
>      > [Giulio: added the driver's stub and handled peripheral clock
>     prescaler
>      > setting]
>      > Signed-off-by: Jesse Taube <mr.bossman075@gmail.com
>     <mailto:mr.bossman075@gmail.com>>
>      > [Jesse: added init, setting prescaler for 24Mhz support and enabling
>      > timer]
>      > ---
>      >? ?drivers/timer/Kconfig? ? ? ? ?|? ?7 ++
>      >? ?drivers/timer/Makefile? ? ? ? |? ?1 +
>      >? ?drivers/timer/imx-gpt-timer.c | 162
>     ++++++++++++++++++++++++++++++++++
>      >? ?3 files changed, 170 insertions(+)
>      >? ?create mode 100644 drivers/timer/imx-gpt-timer.c
>      >
>      > diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
>      > index 80743a2551..ee81dfa776 100644
>      > --- a/drivers/timer/Kconfig
>      > +++ b/drivers/timer/Kconfig
>      > @@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
>      >? ? ? ? ?Select this to enable support for Microchip 64-bit periodic
>      >? ? ? ? ?interval timer.
>      >
>      > +config IMX_GPT_TIMER
>      > +? ? ?bool "NXP i.MX GPT timer support"
>      > +? ? ?depends on TIMER
>      > +? ? ?help
>      > +? ? ? ?Select this to enable support for the timer found on
>      > +? ? ? ?NXP i.MX devices.
>      > +
>      >? ?endmenu
>      > diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
>      > index eb5c48cc6c..e214ba7268 100644
>      > --- a/drivers/timer/Makefile
>      > +++ b/drivers/timer/Makefile
>      > @@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)? ?+= stm32_timer.o
>      >? ?obj-$(CONFIG_X86_TSC_TIMER) += tsc_timer.o
>      >? ?obj-$(CONFIG_MTK_TIMER)? ? ? ? ? ? ?+= mtk_timer.o
>      >? ?obj-$(CONFIG_MCHP_PIT64B_TIMER)? ? ?+= mchp-pit64b-timer.o
>      > +obj-$(CONFIG_IMX_GPT_TIMER)? += imx-gpt-timer.o
>      > diff --git a/drivers/timer/imx-gpt-timer.c
>     b/drivers/timer/imx-gpt-timer.c
>      > new file mode 100644
>      > index 0000000000..a498f2e21c
>      > --- /dev/null
>      > +++ b/drivers/timer/imx-gpt-timer.c
>      > @@ -0,0 +1,162 @@
>      > +// SPDX-License-Identifier: GPL-2.0+
>      > +/*
>      > + * Copyright (C) 2021
>      > + * Author(s): Giulio Benetti
>     <giulio.benetti@benettiengineering.com
>     <mailto:giulio.benetti@benettiengineering.com>>
>      > + */
>      > +
>      > +#include <common.h>
>      > +#include <clk.h>
>      > +#include <dm.h>
>      > +#include <fdtdec.h>
>      > +#include <timer.h>
>      > +#include <dm/device_compat.h>
>      > +
>      > +#include <asm/io.h>
>      > +
>      > +#define GPT_CR_EN? ? ? ? ? ? ? ? ? ? BIT(0)
>      > +#define GPT_CR_FRR? ? ? ? ? ? ? ? ? ?BIT(9)
>      > +#define GPT_CR_EN_24M? ? ? ? ? ? ? ? ? ? ? ? BIT(10)
>      > +#define GPT_CR_SWR? ? ? ? ? ? ? ? ? ?BIT(15)
>      > +
>      > +#define GPT_PR_PRESCALER24M_MASK? ? ?0x0000F000
>      > +#define GPT_PR_PRESCALER24M_SHIFT? ? 12
>      > +#define GPT_PR_PRESCALER24M_MAX? ? ? (GPT_PR_PRESCALER24M_MASK
>      >> GPT_PR_PRESCALER24M_SHIFT)
>      > +#define GPT_PR_PRESCALER_MASK? ? ? ? ? ? ? ? 0x00000FFF
>      > +#define GPT_PR_PRESCALER_SHIFT? ? ? ? ? ? ? ?0
>      > +#define GPT_PR_PRESCALER_MAX? ? ? ? ?(GPT_PR_PRESCALER_MASK >>
>     GPT_PR_PRESCALER_SHIFT)
>      > +
>      > +#define GPT_CLKSRC_IPG_CLK? ? ? ? ? ?(1 << 6)
>      > +#define GPT_CLKSRC_IPG_CLK_24M? ? ? ? ? ? ? ?(5 << 6)
>      > +
>      > +/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
>      > +#ifndef CONFIG_SYS_HZ_CLOCK
>      > +#define CONFIG_SYS_HZ_CLOCK? ? ? ? ? 3000000
>      > +#endif
>      > +
>      > +struct imx_gpt_timer_regs {
>      > +? ? ?u32 cr;
>      > +? ? ?u32 pr;
>      > +? ? ?u32 sr;
>      > +? ? ?u32 ir;
>      > +? ? ?u32 ocr1;
>      > +? ? ?u32 ocr2;
>      > +? ? ?u32 ocr3;
>      > +? ? ?u32 icr1;
>      > +? ? ?u32 icr2;
>      > +? ? ?u32 cnt;
>      > +};
>      > +
>      > +struct imx_gpt_timer_priv {
>      > +? ? ?struct imx_gpt_timer_regs *base;
>      > +};
>      > +
>      > +static u64 imx_gpt_timer_get_count(struct udevice *dev)
>      > +{
>      > +? ? ?struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
>      > +? ? ?struct imx_gpt_timer_regs *regs = priv->base;
>      > +
>      > +? ? ?return readl(&regs->cnt);
>      > +}
>      > +
>      > +static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
>      > +{
>      > +? ? ?u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
>      > +
>      > +? ? ?/* Reset the timer */
>      > +? ? ?setbits_le32(&regs->cr, GPT_CR_SWR);
>      > +
>      > +? ? ?/* Wait for timer to finish reset */
>      > +? ? ?while (readl(&regs->cr) & GPT_CR_SWR)
>      > +? ? ? ? ? ? ?;
>      > +
>      > +? ? ?if (rate == 24000000UL) {
>      > +? ? ? ? ? ? ?/* Set timer frequency if using 24M clock source */
>      > +? ? ? ? ? ? ?if (prescaler > GPT_PR_PRESCALER24M_MAX)
>      > +? ? ? ? ? ? ? ? ? ? ?return -EINVAL;
>      > +
>      > +? ? ? ? ? ? ?/* Set 24M prescaler */
>      > +? ? ? ? ? ? ?writel((prescaler << GPT_PR_PRESCALER24M_SHIFT),
>     &regs->pr);
>      > +? ? ? ? ? ? ?/* Set Oscillator as clock source, enable 24M input
>     and set gpt
>      > +? ? ? ? ? ? ? * in free-running mode
>      > +? ? ? ? ? ? ? */
>      > +? ? ? ? ? ? ?writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M |
>     GPT_CR_FRR, &regs->cr);
>      > +? ? ?} else {
>      > +? ? ? ? ? ? ?if (prescaler > GPT_PR_PRESCALER_MAX)
>      > +? ? ? ? ? ? ? ? ? ? ?return -EINVAL;
>      > +
>      > +? ? ? ? ? ? ?/* Set prescaler */
>      > +? ? ? ? ? ? ?writel((prescaler << GPT_PR_PRESCALER_SHIFT),
>     &regs->pr);
>      > +? ? ? ? ? ? ?/* Set Peripheral as clock source and set gpt in
>     free-running
>      > +? ? ? ? ? ? ? * mode
>      > +? ? ? ? ? ? ? */
>      > +? ? ? ? ? ? ?writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
>      > +? ? ?}
>      > +
>      > +? ? ?/* Start timer */
>      > +? ? ?setbits_le32(&regs->cr, GPT_CR_EN);
>      > +
>      > +? ? ?return 0;
>      > +}
>      > +
>      > +static int imx_gpt_timer_probe(struct udevice *dev)
>      > +{
>      > +? ? ?struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
>      > +? ? ?struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
>      > +? ? ?struct imx_gpt_timer_regs *regs;
>      > +? ? ?struct clk clk;
>      > +? ? ?fdt_addr_t addr;
>      > +? ? ?u32 clk_rate;
>      > +? ? ?int ret;
>      > +
>      > +? ? ?addr = dev_read_addr(dev);
>      > +? ? ?if (addr == FDT_ADDR_T_NONE)
>      > +? ? ? ? ? ? ?return -EINVAL;
>      > +
>      > +? ? ?priv->base = (struct imx_gpt_timer_regs *)addr;
>      > +? ? ?regs = priv->base;
>      > +
>      > +? ? ?ret = clk_get_by_index(dev, 0, &clk);
>      > +? ? ?if (ret < 0)
>      > +? ? ? ? ? ? ?return ret;
>      > +
>      > +? ? ?ret = clk_enable(&clk);
>      > +? ? ?if (ret) {
>      > +? ? ? ? ? ? ?dev_err(dev, "Failed to enable clock\n");
>      > +? ? ? ? ? ? ?return ret;
>      > +? ? ?}
>      > +
>      > +? ? ?/* Get timer clock rate */
>      > +? ? ?clk_rate = clk_get_rate(&clk);
>      > +? ? ?if (clk_rate <= 0) {
>      > +? ? ? ? ? ? ?dev_err(dev, "Could not get clock rate...\n");
>      > +? ? ? ? ? ? ?return -EINVAL;
>      > +? ? ?}
>      > +
>      > +? ? ?ret = imx_gpt_setup(regs, clk_rate);
>      > +? ? ?if (ret) {
>      > +? ? ? ? ? ? ?dev_err(dev, "Could not setup timer\n");
>      > +? ? ? ? ? ? ?return ret;
>      > +? ? ?}
>      > +
>      > +? ? ?uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
>      > +
>      > +? ? ?return 0;
>      > +}
>      > +
>      > +static const struct timer_ops imx_gpt_timer_ops = {
>      > +? ? ?.get_count = imx_gpt_timer_get_count,
>      > +};
>      > +
>      > +static const struct udevice_id imx_gpt_timer_ids[] = {
>      > +? ? ?{ .compatible = "fsl,imxrt-gpt" },
>      > +? ? ?{}
>      > +};
>      > +
>      > +U_BOOT_DRIVER(imx_gpt_timer) = {
>      > +? ? ?.name = "imx_gpt_timer",
>      > +? ? ?.id = UCLASS_TIMER,
>      > +? ? ?.of_match = imx_gpt_timer_ids,
>      > +? ? ?.priv_auto = sizeof(struct imx_gpt_timer_priv),
>      > +? ? ?.probe = imx_gpt_timer_probe,
>      > +? ? ?.ops = &imx_gpt_timer_ops,
>      > +};
>      >
> 

[PATCH 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Sean Anderson]

On 4/7/21 3:02 PM, Giulio Benetti wrote:
> This timer driver is using GPT Timer (General Purpose Timer) available
> on almost all i.MX SoCs family. Since this driver is only meant to
> provide u-boot's timer and counter, and most of the i.MX* SoCs use a
> 24Mhz crystal, let's only deal with that specific source.
> 
> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> [Giulio: added the driver's stub and handled peripheral clock prescaler
> setting]
> Signed-off-by: Jesse Taube <mr.bossman075@gmail.com>
> [Jesse: added init, setting prescaler for 24Mhz support and enabling
> timer]
> ---
>   drivers/timer/Kconfig         |   7 ++
>   drivers/timer/Makefile        |   1 +
>   drivers/timer/imx-gpt-timer.c | 162 ++++++++++++++++++++++++++++++++++
>   3 files changed, 170 insertions(+)
>   create mode 100644 drivers/timer/imx-gpt-timer.c
> 
> diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
> index 80743a2551..ee81dfa776 100644
> --- a/drivers/timer/Kconfig
> +++ b/drivers/timer/Kconfig
> @@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
>   	  Select this to enable support for Microchip 64-bit periodic
>   	  interval timer.
>   
> +config IMX_GPT_TIMER
> +	bool "NXP i.MX GPT timer support"
> +	depends on TIMER
> +	help
> +	  Select this to enable support for the timer found on
> +	  NXP i.MX devices.
> +
>   endmenu
> diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
> index eb5c48cc6c..e214ba7268 100644
> --- a/drivers/timer/Makefile
> +++ b/drivers/timer/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)	+= stm32_timer.o
>   obj-$(CONFIG_X86_TSC_TIMER)	+= tsc_timer.o
>   obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
>   obj-$(CONFIG_MCHP_PIT64B_TIMER)	+= mchp-pit64b-timer.o
> +obj-$(CONFIG_IMX_GPT_TIMER)	+= imx-gpt-timer.o
> diff --git a/drivers/timer/imx-gpt-timer.c b/drivers/timer/imx-gpt-timer.c
> new file mode 100644
> index 0000000000..a498f2e21c
> --- /dev/null
> +++ b/drivers/timer/imx-gpt-timer.c
> @@ -0,0 +1,162 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2021
> + * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <fdtdec.h>
> +#include <timer.h>
> +#include <dm/device_compat.h>
> +
> +#include <asm/io.h>
> +
> +#define GPT_CR_EN			BIT(0)
> +#define GPT_CR_FRR			BIT(9)
> +#define GPT_CR_EN_24M			BIT(10)
> +#define GPT_CR_SWR			BIT(15)
> +
> +#define GPT_PR_PRESCALER24M_MASK	0x0000F000
> +#define GPT_PR_PRESCALER24M_SHIFT	12
> +#define GPT_PR_PRESCALER24M_MAX	(GPT_PR_PRESCALER24M_MASK >> GPT_PR_PRESCALER24M_SHIFT)
> +#define GPT_PR_PRESCALER_MASK		0x00000FFF
> +#define GPT_PR_PRESCALER_SHIFT		0
> +#define GPT_PR_PRESCALER_MAX		(GPT_PR_PRESCALER_MASK >> GPT_PR_PRESCALER_SHIFT)
> +
> +#define GPT_CLKSRC_IPG_CLK		(1 << 6)
> +#define GPT_CLKSRC_IPG_CLK_24M		(5 << 6)
> +
> +/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
> +#ifndef CONFIG_SYS_HZ_CLOCK
> +#define CONFIG_SYS_HZ_CLOCK		3000000
> +#endif
> +
> +struct imx_gpt_timer_regs {
> +	u32 cr;
> +	u32 pr;
> +	u32 sr;
> +	u32 ir;
> +	u32 ocr1;
> +	u32 ocr2;
> +	u32 ocr3;
> +	u32 icr1;
> +	u32 icr2;
> +	u32 cnt;
> +};
> +
> +struct imx_gpt_timer_priv {
> +	struct imx_gpt_timer_regs *base;
> +};
> +
> +static u64 imx_gpt_timer_get_count(struct udevice *dev)
> +{
> +	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> +	struct imx_gpt_timer_regs *regs = priv->base;
> +
> +	return readl(&regs->cnt);

This should use timer_conv_64 since it is a 32-bit timer.

--Sean

> +}
> +
> +static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
> +{
> +	u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
> +
> +	/* Reset the timer */
> +	setbits_le32(&regs->cr, GPT_CR_SWR);
> +
> +	/* Wait for timer to finish reset */
> +	while (readl(&regs->cr) & GPT_CR_SWR)
> +		;
> +
> +	if (rate == 24000000UL) {
> +		/* Set timer frequency if using 24M clock source */
> +		if (prescaler > GPT_PR_PRESCALER24M_MAX)
> +			return -EINVAL;
> +
> +		/* Set 24M prescaler */
> +		writel((prescaler << GPT_PR_PRESCALER24M_SHIFT), &regs->pr);
> +		/* Set Oscillator as clock source, enable 24M input and set gpt
> +		 * in free-running mode
> +		 */
> +		writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M | GPT_CR_FRR, &regs->cr);
> +	} else {
> +		if (prescaler > GPT_PR_PRESCALER_MAX)
> +			return -EINVAL;
> +
> +		/* Set prescaler */
> +		writel((prescaler << GPT_PR_PRESCALER_SHIFT), &regs->pr);
> +		/* Set Peripheral as clock source and set gpt in free-running
> +		 * mode
> +		 */
> +		writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
> +	}
> +
> +	/* Start timer */
> +	setbits_le32(&regs->cr, GPT_CR_EN);
> +
> +	return 0;
> +}
> +
> +static int imx_gpt_timer_probe(struct udevice *dev)
> +{
> +	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
> +	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
> +	struct imx_gpt_timer_regs *regs;
> +	struct clk clk;
> +	fdt_addr_t addr;
> +	u32 clk_rate;
> +	int ret;
> +
> +	addr = dev_read_addr(dev);
> +	if (addr == FDT_ADDR_T_NONE)
> +		return -EINVAL;
> +
> +	priv->base = (struct imx_gpt_timer_regs *)addr;
> +	regs = priv->base;
> +
> +	ret = clk_get_by_index(dev, 0, &clk);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = clk_enable(&clk);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable clock\n");
> +		return ret;
> +	}
> +
> +	/* Get timer clock rate */
> +	clk_rate = clk_get_rate(&clk);
> +	if (clk_rate <= 0) {
> +		dev_err(dev, "Could not get clock rate...\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = imx_gpt_setup(regs, clk_rate);
> +	if (ret) {
> +		dev_err(dev, "Could not setup timer\n");
> +		return ret;
> +	}
> +
> +	uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
> +
> +	return 0;
> +}
> +
> +static const struct timer_ops imx_gpt_timer_ops = {
> +	.get_count = imx_gpt_timer_get_count,
> +};
> +
> +static const struct udevice_id imx_gpt_timer_ids[] = {
> +	{ .compatible = "fsl,imxrt-gpt" },
> +	{}
> +};
> +
> +U_BOOT_DRIVER(imx_gpt_timer) = {
> +	.name = "imx_gpt_timer",
> +	.id = UCLASS_TIMER,
> +	.of_match = imx_gpt_timer_ids,
> +	.priv_auto = sizeof(struct imx_gpt_timer_priv),
> +	.probe = imx_gpt_timer_probe,
> +	.ops = &imx_gpt_timer_ops,
> +};
> 

[PATCH 03/16] ARM: dts: imxrt1020: add alias to osc

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
index 97f3cec9f3..0a3a3b451a 100644
--- a/arch/arm/dts/imxrt1020.dtsi
+++ b/arch/arm/dts/imxrt1020.dtsi
@@ -36,7 +36,7 @@
 			clock-frequency = <0>;
 		};
 
-		osc {
+		osc: osc {
 			u-boot,dm-spl;
 			compatible = "fsl,imx-osc", "fixed-clock";
 			#clock-cells = <0>;
-- 
2.25.1

[PATCH 03/16] ARM: dts: imxrt1020: add alias to osc

[Fabio Estevam]

Hi Giulio,

On Wed, Apr 7, 2021 at 4:03 PM Giulio Benetti
<giulio.benetti@benettiengineering.com> wrote:
>
> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> ---
>  arch/arm/dts/imxrt1020.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
> index 97f3cec9f3..0a3a3b451a 100644
> --- a/arch/arm/dts/imxrt1020.dtsi
> +++ b/arch/arm/dts/imxrt1020.dtsi
> @@ -36,7 +36,7 @@
>                         clock-frequency = <0>;
>                 };
>
> -               osc {
> +               osc: osc {

Nit: what you are adding here is a "node label", not an "alias".

It would be nice to always add a commit log, even if it is a short one.

[PATCH 03/16] ARM: dts: imxrt1020: add alias to osc

[Giulio Benetti]

Hi Gabio,

> Il giorno 3 mag 2021, alle ore 16:01, Fabio Estevam <festevam@gmail.com> ha scritto:
> 
> ?Hi Giulio,
> 
>> On Wed, Apr 7, 2021 at 4:03 PM Giulio Benetti
>> <giulio.benetti@benettiengineering.com> wrote:
>> 
>> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
>> ---
>> arch/arm/dts/imxrt1020.dtsi | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
>> index 97f3cec9f3..0a3a3b451a 100644
>> --- a/arch/arm/dts/imxrt1020.dtsi
>> +++ b/arch/arm/dts/imxrt1020.dtsi
>> @@ -36,7 +36,7 @@
>>                        clock-frequency = <0>;
>>                };
>> 
>> -               osc {
>> +               osc: osc {
> 
> Nit: what you are adding here is a "node label", not an "alias".
Thank you, you?re right.
> 
> It would be nice to always add a commit log, even if it is a short one.

Ok, is it ok if it even repeats the first line? Because I don?t know what write more than that.

Best regards
Giulio Benetti

[PATCH 03/16] ARM: dts: imxrt1020: add alias to osc

[Fabio Estevam]

On Mon, May 3, 2021 at 2:52 PM Giulio Benetti
<giulio.benetti@benettiengineering.com> wrote:

> Ok, is it ok if it even repeats the first line? Because I don?t know what write more than that.

Yes, that would be fine.

[PATCH 03/16] ARM: dts: imxrt1020: add alias to osc

[Giulio Benetti]

> Il giorno 3 mag 2021, alle ore 20:21, Fabio Estevam <festevam@gmail.com> ha scritto:
> 
> ?On Mon, May 3, 2021 at 2:52 PM Giulio Benetti
> <giulio.benetti@benettiengineering.com> wrote:
> 
>> Ok, is it ok if it even repeats the first line? Because I don?t know what write more than that.
> 
> Yes, that would be fine.

Ok thank you. This was a doubt I always had.

Giulio

[PATCH 04/16] ARM: dts: imxrt1020: add gpt1 node

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
index 0a3a3b451a..cab608c644 100644
--- a/arch/arm/dts/imxrt1020.dtsi
+++ b/arch/arm/dts/imxrt1020.dtsi
@@ -129,5 +129,13 @@
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		gpt1: gpt1 at 401ec000 {
+			compatible = "fsl,imxrt-gpt";
+			reg = <0x401ec000 0x4000>;
+			interrupts = <100>;
+			clocks = <&osc>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.25.1

[PATCH 05/16] ARM: dts: imxrt1020-evk: enable gpt1 timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index ece13601bd..a471ff3838 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -186,6 +186,10 @@
 	};
 };
 
+&gpt1 {
+	status = "okay";
+};
+
 &usdhc1 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
 	pinctrl-0 = <&pinctrl_usdhc0>;
-- 
2.25.1

[PATCH 06/16] ARM: dts: imxrt1020-evk: set gpt1 as tick-timer for u-boot

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index a471ff3838..b527206fcf 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -16,6 +16,7 @@
 	chosen {
 		bootargs = "root=/dev/ram";
 		stdout-path = "serial0:115200n8";
+		tick-timer = &gpt1;
 	};
 
 	memory {
-- 
2.25.1

[PATCH 07/16] ARM: dts: imxrt1020-evk-u-boot: make gpt1 present for SPL

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
index d32c98de9c..34d19e06c5 100644
--- a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
+++ b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
@@ -10,6 +10,10 @@
 	};
 };
 
+&gpt1 {
+	u-boot,dm-spl;
+};
+
 &lpuart1 { /* console */
 	u-boot,dm-spl;
 };
-- 
2.25.1

[PATCH 08/16] ARM: dts: imxrt1020-evk: add device_type = "memory" to memory node

[Giulio Benetti]

Now device_type = "memory" is mandatory to allow u-boot to read memory
node, so let's add it to memory node.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index b527206fcf..2da79e5c20 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -20,6 +20,7 @@
 	};
 
 	memory {
+		device_type = "memory";
 		reg = <0x80000000 0x2000000>;
 	};
 };
-- 
2.25.1

[PATCH 09/16] configs: imxrt1020-evk: enable imx gpt timer as tick-timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 configs/imxrt1020-evk_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/imxrt1020-evk_defconfig b/configs/imxrt1020-evk_defconfig
index 9bddb69cd4..51ff702bc6 100644
--- a/configs/imxrt1020-evk_defconfig
+++ b/configs/imxrt1020-evk_defconfig
@@ -62,6 +62,7 @@ CONFIG_IMXRT_SDRAM=y
 CONFIG_FSL_LPUART=y
 CONFIG_TIMER=y
 CONFIG_SPL_TIMER=y
+CONFIG_IMX_GPT_TIMER=y
 CONFIG_SHA1=y
 CONFIG_SHA256=y
 CONFIG_HEXDUMP=y
-- 
2.25.1

[PATCH 10/16] ARM: dts: imxrt1050: add alias to osc

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/dts/imxrt1050.dtsi b/arch/arm/dts/imxrt1050.dtsi
index a9281001e5..b7cc3fbc2a 100644
--- a/arch/arm/dts/imxrt1050.dtsi
+++ b/arch/arm/dts/imxrt1050.dtsi
@@ -28,7 +28,7 @@
 	clocks {
 		u-boot,dm-spl;
 
-		osc {
+		osc: osc {
 			u-boot,dm-spl;
 			compatible = "fsl,imx-osc", "fixed-clock";
 			#clock-cells = <0>;
-- 
2.25.1

[PATCH 11/16] ARM: dts: imxrt1050: add gpt1 node

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/dts/imxrt1050.dtsi b/arch/arm/dts/imxrt1050.dtsi
index b7cc3fbc2a..6f9da3fe8a 100644
--- a/arch/arm/dts/imxrt1050.dtsi
+++ b/arch/arm/dts/imxrt1050.dtsi
@@ -154,5 +154,13 @@
 			clock-names = "per";
 			status = "disabled";
 		};
+
+		gpt1: gpt1 at 401ec000 {
+			compatible = "fsl,imxrt-gpt";
+			reg = <0x401ec000 0x4000>;
+			interrupts = <100>;
+			clocks = <&osc>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.25.1

[PATCH 12/16] ARM: dts: imxrt1050-evk: enable gpt1 timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050-evk.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1050-evk.dts b/arch/arm/dts/imxrt1050-evk.dts
index b5e781275e..e592330332 100644
--- a/arch/arm/dts/imxrt1050-evk.dts
+++ b/arch/arm/dts/imxrt1050-evk.dts
@@ -215,6 +215,10 @@
 	};
 };
 
+&gpt1 {
+	status = "okay";
+};
+
 &usdhc1 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
 	pinctrl-0 = <&pinctrl_usdhc0>;
-- 
2.25.1

[PATCH v2 00/16] Fix i.MXRT1020/50

[Giulio Benetti]

This patchset adds imx-gpt-timer driver that is supported by i.MXRT and also
a lot of other i.MX* SoCs. This driver is needed for i.MXRT SoC family that is
lacking at the moment the timer at all and that makes u-boot to fail running on
i.MXRT.
There are also some fixes in imxrt10*0-evk.dts and other minor fixed and
improvements.

---
V1->V2:
* fixed 32 to 64 bit conversion on timer as suggested by Sean Anderson
---

Giulio Benetti (16):
  arm: imxrt: soc: make mpu regions generic
  timer: imx-gpt: Add timer support for i.MX SoCs family
  ARM: dts: imxrt1020: add alias to osc
  ARM: dts: imxrt1020: add gpt1 node
  ARM: dts: imxrt1020-evk: enable gpt1 timer
  ARM: dts: imxrt1020-evk: set gpt1 as tick-timer for u-boot
  ARM: dts: imxrt1020-evk-u-boot: make gpt1 present for SPL
  ARM: dts: imxrt1020-evk: add device_type = "memory" to memory node
  configs: imxrt1020-evk: enable imx gpt timer as tick-timer
  ARM: dts: imxrt1050: add alias to osc
  ARM: dts: imxrt1050: add gpt1 node
  ARM: dts: imxrt1050-evk: enable gpt1 timer
  ARM: dts: imxrt1050-evk: set gpt1 as tick-timer for u-boot
  ARM: dts: imxrt1050-evk-u-boot: make gpt1 present for SPL
  ARM: dts: imxrt1050-evk: add device_type = "memory" to memory node
  configs: imxrt1050-evk: enable imx gpt timer as tick-timer

 arch/arm/dts/imxrt1020-evk-u-boot.dtsi |   4 +
 arch/arm/dts/imxrt1020-evk.dts         |   6 +
 arch/arm/dts/imxrt1020.dtsi            |  10 +-
 arch/arm/dts/imxrt1050-evk-u-boot.dtsi |   4 +
 arch/arm/dts/imxrt1050-evk.dts         |   6 +
 arch/arm/dts/imxrt1050.dtsi            |  10 +-
 arch/arm/mach-imx/imxrt/soc.c          |   6 +-
 configs/imxrt1020-evk_defconfig        |   1 +
 configs/imxrt1050-evk_defconfig        |   1 +
 drivers/timer/Kconfig                  |   7 ++
 drivers/timer/Makefile                 |   1 +
 drivers/timer/imx-gpt-timer.c          | 162 +++++++++++++++++++++++++
 12 files changed, 213 insertions(+), 5 deletions(-)
 create mode 100644 drivers/timer/imx-gpt-timer.c

-- 
2.25.1

[PATCH v2 01/16] arm: imxrt: soc: make mpu regions generic

[Giulio Benetti]

This mpu handling works for every i.MXRT SoC that we have, so let's
generalize imxrt1050_region_config to imxrt_region_config.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/mach-imx/imxrt/soc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-imx/imxrt/soc.c b/arch/arm/mach-imx/imxrt/soc.c
index 8e7d15160d..c533f3554a 100644
--- a/arch/arm/mach-imx/imxrt/soc.c
+++ b/arch/arm/mach-imx/imxrt/soc.c
@@ -14,7 +14,7 @@ int arch_cpu_init(void)
 {
 	int i;
 
-	struct mpu_region_config imxrt1050_region_config[] = {
+	struct mpu_region_config imxrt_region_config[] = {
 		{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
 		  STRONG_ORDER, REGION_4GB },
 		{ PHYS_SDRAM, REGION_1, XN_DIS, PRIV_RW_USR_RW,
@@ -29,8 +29,8 @@ int arch_cpu_init(void)
 	 * the whole 4GB address space.
 	 */
 	disable_mpu();
-	for (i = 0; i < ARRAY_SIZE(imxrt1050_region_config); i++)
-		mpu_config(&imxrt1050_region_config[i]);
+	for (i = 0; i < ARRAY_SIZE(imxrt_region_config); i++)
+		mpu_config(&imxrt_region_config[i]);
 	enable_mpu();
 
 	return 0;
-- 
2.25.1

[PATCH v2 02/16] timer: imx-gpt: Add timer support for i.MX SoCs family

[Giulio Benetti]

This timer driver uses GPT Timer (General Purpose Timer) available on
a lot of i.MX SoCs family. This driver deals with both 24Mhz oscillator
as well as peripheral clock.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[Giulio: added the driver's stub and handled peripheral clock prescaler
setting]
Signed-off-by: Jesse Taube <mr.bossman075@gmail.com>
[Jesse: added init, setting prescaler for 24Mhz support and enabling
timer]
---
V1->V2:
* fixed 32 to 64 bit conversion on timer as suggested by Sean Anderson by
  using timer_conv_64() in imx_gpt_timer_get_count()
---
 drivers/timer/Kconfig         |   7 ++
 drivers/timer/Makefile        |   1 +
 drivers/timer/imx-gpt-timer.c | 162 ++++++++++++++++++++++++++++++++++
 3 files changed, 170 insertions(+)
 create mode 100644 drivers/timer/imx-gpt-timer.c

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 80743a2551..ee81dfa776 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -227,4 +227,11 @@ config MCHP_PIT64B_TIMER
 	  Select this to enable support for Microchip 64-bit periodic
 	  interval timer.
 
+config IMX_GPT_TIMER
+	bool "NXP i.MX GPT timer support"
+	depends on TIMER
+	help
+	  Select this to enable support for the timer found on
+	  NXP i.MX devices.
+
 endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index eb5c48cc6c..e214ba7268 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_TIMER)	+= stm32_timer.o
 obj-$(CONFIG_X86_TSC_TIMER)	+= tsc_timer.o
 obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
 obj-$(CONFIG_MCHP_PIT64B_TIMER)	+= mchp-pit64b-timer.o
+obj-$(CONFIG_IMX_GPT_TIMER)	+= imx-gpt-timer.o
diff --git a/drivers/timer/imx-gpt-timer.c b/drivers/timer/imx-gpt-timer.c
new file mode 100644
index 0000000000..72be297754
--- /dev/null
+++ b/drivers/timer/imx-gpt-timer.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021
+ * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <timer.h>
+#include <dm/device_compat.h>
+
+#include <asm/io.h>
+
+#define GPT_CR_EN			BIT(0)
+#define GPT_CR_FRR			BIT(9)
+#define GPT_CR_EN_24M			BIT(10)
+#define GPT_CR_SWR			BIT(15)
+
+#define GPT_PR_PRESCALER24M_MASK	0x0000F000
+#define GPT_PR_PRESCALER24M_SHIFT	12
+#define GPT_PR_PRESCALER24M_MAX	(GPT_PR_PRESCALER24M_MASK >> GPT_PR_PRESCALER24M_SHIFT)
+#define GPT_PR_PRESCALER_MASK		0x00000FFF
+#define GPT_PR_PRESCALER_SHIFT		0
+#define GPT_PR_PRESCALER_MAX		(GPT_PR_PRESCALER_MASK >> GPT_PR_PRESCALER_SHIFT)
+
+#define GPT_CLKSRC_IPG_CLK		(1 << 6)
+#define GPT_CLKSRC_IPG_CLK_24M		(5 << 6)
+
+/* If CONFIG_SYS_HZ_CLOCK not specified et's default to 3Mhz */
+#ifndef CONFIG_SYS_HZ_CLOCK
+#define CONFIG_SYS_HZ_CLOCK		3000000
+#endif
+
+struct imx_gpt_timer_regs {
+	u32 cr;
+	u32 pr;
+	u32 sr;
+	u32 ir;
+	u32 ocr1;
+	u32 ocr2;
+	u32 ocr3;
+	u32 icr1;
+	u32 icr2;
+	u32 cnt;
+};
+
+struct imx_gpt_timer_priv {
+	struct imx_gpt_timer_regs *base;
+};
+
+static u64 imx_gpt_timer_get_count(struct udevice *dev)
+{
+	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
+	struct imx_gpt_timer_regs *regs = priv->base;
+
+	return timer_conv_64(readl(&regs->cnt));
+}
+
+static int imx_gpt_setup(struct imx_gpt_timer_regs *regs, u32 rate)
+{
+	u32 prescaler = (rate / CONFIG_SYS_HZ_CLOCK) - 1;
+
+	/* Reset the timer */
+	setbits_le32(&regs->cr, GPT_CR_SWR);
+
+	/* Wait for timer to finish reset */
+	while (readl(&regs->cr) & GPT_CR_SWR)
+		;
+
+	if (rate == 24000000UL) {
+		/* Set timer frequency if using 24M clock source */
+		if (prescaler > GPT_PR_PRESCALER24M_MAX)
+			return -EINVAL;
+
+		/* Set 24M prescaler */
+		writel((prescaler << GPT_PR_PRESCALER24M_SHIFT), &regs->pr);
+		/* Set Oscillator as clock source, enable 24M input and set gpt
+		 * in free-running mode
+		 */
+		writel(GPT_CLKSRC_IPG_CLK_24M | GPT_CR_EN_24M | GPT_CR_FRR, &regs->cr);
+	} else {
+		if (prescaler > GPT_PR_PRESCALER_MAX)
+			return -EINVAL;
+
+		/* Set prescaler */
+		writel((prescaler << GPT_PR_PRESCALER_SHIFT), &regs->pr);
+		/* Set Peripheral as clock source and set gpt in free-running
+		 * mode
+		 */
+		writel(GPT_CLKSRC_IPG_CLK | GPT_CR_FRR, &regs->cr);
+	}
+
+	/* Start timer */
+	setbits_le32(&regs->cr, GPT_CR_EN);
+
+	return 0;
+}
+
+static int imx_gpt_timer_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct imx_gpt_timer_priv *priv = dev_get_priv(dev);
+	struct imx_gpt_timer_regs *regs;
+	struct clk clk;
+	fdt_addr_t addr;
+	u32 clk_rate;
+	int ret;
+
+	addr = dev_read_addr(dev);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->base = (struct imx_gpt_timer_regs *)addr;
+	regs = priv->base;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_enable(&clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	/* Get timer clock rate */
+	clk_rate = clk_get_rate(&clk);
+	if (clk_rate <= 0) {
+		dev_err(dev, "Could not get clock rate...\n");
+		return -EINVAL;
+	}
+
+	ret = imx_gpt_setup(regs, clk_rate);
+	if (ret) {
+		dev_err(dev, "Could not setup timer\n");
+		return ret;
+	}
+
+	uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
+
+	return 0;
+}
+
+static const struct timer_ops imx_gpt_timer_ops = {
+	.get_count = imx_gpt_timer_get_count,
+};
+
+static const struct udevice_id imx_gpt_timer_ids[] = {
+	{ .compatible = "fsl,imxrt-gpt" },
+	{}
+};
+
+U_BOOT_DRIVER(imx_gpt_timer) = {
+	.name = "imx_gpt_timer",
+	.id = UCLASS_TIMER,
+	.of_match = imx_gpt_timer_ids,
+	.priv_auto = sizeof(struct imx_gpt_timer_priv),
+	.probe = imx_gpt_timer_probe,
+	.ops = &imx_gpt_timer_ops,
+};
-- 
2.25.1

[PATCH v2 03/16] ARM: dts: imxrt1020: add alias to osc

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
index 97f3cec9f3..0a3a3b451a 100644
--- a/arch/arm/dts/imxrt1020.dtsi
+++ b/arch/arm/dts/imxrt1020.dtsi
@@ -36,7 +36,7 @@
 			clock-frequency = <0>;
 		};
 
-		osc {
+		osc: osc {
 			u-boot,dm-spl;
 			compatible = "fsl,imx-osc", "fixed-clock";
 			#clock-cells = <0>;
-- 
2.25.1

[PATCH v2 04/16] ARM: dts: imxrt1020: add gpt1 node

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/dts/imxrt1020.dtsi b/arch/arm/dts/imxrt1020.dtsi
index 0a3a3b451a..cab608c644 100644
--- a/arch/arm/dts/imxrt1020.dtsi
+++ b/arch/arm/dts/imxrt1020.dtsi
@@ -129,5 +129,13 @@
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		gpt1: gpt1 at 401ec000 {
+			compatible = "fsl,imxrt-gpt";
+			reg = <0x401ec000 0x4000>;
+			interrupts = <100>;
+			clocks = <&osc>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.25.1

[PATCH v2 05/16] ARM: dts: imxrt1020-evk: enable gpt1 timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index ece13601bd..a471ff3838 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -186,6 +186,10 @@
 	};
 };
 
+&gpt1 {
+	status = "okay";
+};
+
 &usdhc1 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
 	pinctrl-0 = <&pinctrl_usdhc0>;
-- 
2.25.1

[PATCH v2 06/16] ARM: dts: imxrt1020-evk: set gpt1 as tick-timer for u-boot

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index a471ff3838..b527206fcf 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -16,6 +16,7 @@
 	chosen {
 		bootargs = "root=/dev/ram";
 		stdout-path = "serial0:115200n8";
+		tick-timer = &gpt1;
 	};
 
 	memory {
-- 
2.25.1

[PATCH v2 07/16] ARM: dts: imxrt1020-evk-u-boot: make gpt1 present for SPL

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
index d32c98de9c..34d19e06c5 100644
--- a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
+++ b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
@@ -10,6 +10,10 @@
 	};
 };
 
+&gpt1 {
+	u-boot,dm-spl;
+};
+
 &lpuart1 { /* console */
 	u-boot,dm-spl;
 };
-- 
2.25.1

[PATCH v2 08/16] ARM: dts: imxrt1020-evk: add device_type = "memory" to memory node

[Giulio Benetti]

Now device_type = "memory" is mandatory to allow u-boot to read memory
node, so let's add it to memory node.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1020-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
index b527206fcf..2da79e5c20 100644
--- a/arch/arm/dts/imxrt1020-evk.dts
+++ b/arch/arm/dts/imxrt1020-evk.dts
@@ -20,6 +20,7 @@
 	};
 
 	memory {
+		device_type = "memory";
 		reg = <0x80000000 0x2000000>;
 	};
 };
-- 
2.25.1

[PATCH v2 09/16] configs: imxrt1020-evk: enable imx gpt timer as tick-timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 configs/imxrt1020-evk_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/imxrt1020-evk_defconfig b/configs/imxrt1020-evk_defconfig
index 9bddb69cd4..51ff702bc6 100644
--- a/configs/imxrt1020-evk_defconfig
+++ b/configs/imxrt1020-evk_defconfig
@@ -62,6 +62,7 @@ CONFIG_IMXRT_SDRAM=y
 CONFIG_FSL_LPUART=y
 CONFIG_TIMER=y
 CONFIG_SPL_TIMER=y
+CONFIG_IMX_GPT_TIMER=y
 CONFIG_SHA1=y
 CONFIG_SHA256=y
 CONFIG_HEXDUMP=y
-- 
2.25.1

[PATCH v2 10/16] ARM: dts: imxrt1050: add alias to osc

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/dts/imxrt1050.dtsi b/arch/arm/dts/imxrt1050.dtsi
index a9281001e5..b7cc3fbc2a 100644
--- a/arch/arm/dts/imxrt1050.dtsi
+++ b/arch/arm/dts/imxrt1050.dtsi
@@ -28,7 +28,7 @@
 	clocks {
 		u-boot,dm-spl;
 
-		osc {
+		osc: osc {
 			u-boot,dm-spl;
 			compatible = "fsl,imx-osc", "fixed-clock";
 			#clock-cells = <0>;
-- 
2.25.1

[PATCH v2 11/16] ARM: dts: imxrt1050: add gpt1 node

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/dts/imxrt1050.dtsi b/arch/arm/dts/imxrt1050.dtsi
index b7cc3fbc2a..6f9da3fe8a 100644
--- a/arch/arm/dts/imxrt1050.dtsi
+++ b/arch/arm/dts/imxrt1050.dtsi
@@ -154,5 +154,13 @@
 			clock-names = "per";
 			status = "disabled";
 		};
+
+		gpt1: gpt1 at 401ec000 {
+			compatible = "fsl,imxrt-gpt";
+			reg = <0x401ec000 0x4000>;
+			interrupts = <100>;
+			clocks = <&osc>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.25.1

[PATCH v2 12/16] ARM: dts: imxrt1050-evk: enable gpt1 timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050-evk.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1050-evk.dts b/arch/arm/dts/imxrt1050-evk.dts
index b5e781275e..e592330332 100644
--- a/arch/arm/dts/imxrt1050-evk.dts
+++ b/arch/arm/dts/imxrt1050-evk.dts
@@ -215,6 +215,10 @@
 	};
 };
 
+&gpt1 {
+	status = "okay";
+};
+
 &usdhc1 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
 	pinctrl-0 = <&pinctrl_usdhc0>;
-- 
2.25.1

[PATCH v2 13/16] ARM: dts: imxrt1050-evk: set gpt1 as tick-timer for u-boot

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1050-evk.dts b/arch/arm/dts/imxrt1050-evk.dts
index e592330332..6d21f2b738 100644
--- a/arch/arm/dts/imxrt1050-evk.dts
+++ b/arch/arm/dts/imxrt1050-evk.dts
@@ -16,6 +16,7 @@
 	chosen {
 		bootargs = "root=/dev/ram";
 		stdout-path = "serial0:115200n8";
+		tick-timer = &gpt1;
 	};
 
 	memory {
-- 
2.25.1

[PATCH v2 14/16] ARM: dts: imxrt1050-evk-u-boot: make gpt1 present for SPL

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050-evk-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/imxrt1050-evk-u-boot.dtsi b/arch/arm/dts/imxrt1050-evk-u-boot.dtsi
index fb4f7f6f9d..a4b50f0bb2 100644
--- a/arch/arm/dts/imxrt1050-evk-u-boot.dtsi
+++ b/arch/arm/dts/imxrt1050-evk-u-boot.dtsi
@@ -10,6 +10,10 @@
 	};
 };
 
+&gpt1 {
+	u-boot,dm-spl;
+};
+
 &lpuart1 { /* console */
 	u-boot,dm-spl;
 };
-- 
2.25.1

[PATCH v2 15/16] ARM: dts: imxrt1050-evk: add device_type = "memory" to memory node

[Giulio Benetti]

Now device_type = "memory" is mandatory to allow u-boot to read memory
node, so let's add it to memory node.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 arch/arm/dts/imxrt1050-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/dts/imxrt1050-evk.dts b/arch/arm/dts/imxrt1050-evk.dts
index 6d21f2b738..2052d4eb4e 100644
--- a/arch/arm/dts/imxrt1050-evk.dts
+++ b/arch/arm/dts/imxrt1050-evk.dts
@@ -20,6 +20,7 @@
 	};
 
 	memory {
+		device_type = "memory";
 		reg = <0x80000000 0x2000000>;
 	};
 };
-- 
2.25.1

[PATCH v2 16/16] configs: imxrt1050-evk: enable imx gpt timer as tick-timer

[Giulio Benetti]

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 configs/imxrt1050-evk_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/imxrt1050-evk_defconfig b/configs/imxrt1050-evk_defconfig
index f639ea7623..e74473511d 100644
--- a/configs/imxrt1050-evk_defconfig
+++ b/configs/imxrt1050-evk_defconfig
@@ -65,6 +65,7 @@ CONFIG_IMXRT_SDRAM=y
 CONFIG_FSL_LPUART=y
 CONFIG_TIMER=y
 CONFIG_SPL_TIMER=y
+CONFIG_IMX_GPT_TIMER=y
 CONFIG_DM_VIDEO=y
 CONFIG_BACKLIGHT_GPIO=y
 CONFIG_SYS_WHITE_ON_BLACK=y
-- 
2.25.1