[U-Boot] [PATCH 1/2] pinctrl: imx: Introduce pinctrl driver for i.MX6
Peng Fan
van.freenix at gmail.com
Tue Feb 2 09:57:26 CET 2016
Hi Simon,
On Mon, Feb 01, 2016 at 05:05:05PM -0700, Simon Glass wrote:
>Hi Peng,
>
>On 31 January 2016 at 22:38, Peng Fan <van.freenix at gmail.com> wrote:
>> Introduce pinctrl for i.MX6
>> 1. pinctrl-imx.c is for common usage. It's used by i.MX6/7.
>> 2. Add PINCTRL_IMX PINCTRL_IMX6 Kconfig entry.
>> 3. To the pinctrl_ops implementation, only set_state is implemented.
>> To i.MX6/7, the pinctrl dts entry is as following:
>> &iomuxc {
>> pinctrl-names = "default";
>>
>> pinctrl_csi1: csi1grp {
>> fsl,pins = <
>> MX6UL_PAD_CSI_MCLK__CSI_MCLK 0x1b088
>> MX6UL_PAD_CSI_PIXCLK__CSI_PIXCLK 0x1b088
>> MX6UL_PAD_CSI_VSYNC__CSI_VSYNC 0x1b088
>> >;
>> };
>>
>> [.....]
>> };
>> there is no property named function or groups. So pinctrl_generic_set_state
>> can not be used here.
>> 5. This driver is a simple implementation for i.mx iomux controller,
>> only parse the fsl,pins property and write value to registers.
>> 6. With DEBUG enabled, we can see log when "i2c bus 0":
>> "
>> set_state_simple op missing
>> imx_pinctrl_set_state: i2c1grp
>> mux_reg 0x14c, conf_reg 0x3bc, input_reg 0x5d8, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
>> write mux: offset 0x14c val 0x10
>> select_input: offset 0x5d8 val 0x1
>> write config: offset 0x3bc val 0x7f
>> mux_reg 0x148, conf_reg 0x3b8, input_reg 0x5d4, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
>> write mux: offset 0x148 val 0x10
>> select_input: offset 0x5d4 val 0x1
>> write config: offset 0x3b8 val 0x7f
>> "
>> this means imx6 pinctrl driver works as expected.
>>
>> Signed-off-by: Peng Fan <van.freenix at gmail.com>
>> Cc: Simon Glass <sjg at chromium.org>
>> Cc: Stefano Babic <sbabic at denx.de>
>> Cc: Fabio Estevam <fabio.estevam at nxp.com>
>> ---
>> drivers/pinctrl/Kconfig | 1 +
>> drivers/pinctrl/Makefile | 1 +
>> drivers/pinctrl/nxp/Kconfig | 10 ++
>> drivers/pinctrl/nxp/Makefile | 2 +
>> drivers/pinctrl/nxp/pinctrl-imx.c | 224 +++++++++++++++++++++++++++++++++++++
>> drivers/pinctrl/nxp/pinctrl-imx.h | 59 ++++++++++
>> drivers/pinctrl/nxp/pinctrl-imx6.c | 41 +++++++
>> 7 files changed, 338 insertions(+)
>> create mode 100644 drivers/pinctrl/nxp/Kconfig
>> create mode 100644 drivers/pinctrl/nxp/Makefile
>> create mode 100644 drivers/pinctrl/nxp/pinctrl-imx.c
>> create mode 100644 drivers/pinctrl/nxp/pinctrl-imx.h
>> create mode 100644 drivers/pinctrl/nxp/pinctrl-imx6.c
>>
>
>Reviewed-by: Simon Glass <sjg at chromium.org>
>
>Some questions and comments below.
>
>> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
>> index 57e6142..9fd8f62 100644
>> --- a/drivers/pinctrl/Kconfig
>> +++ b/drivers/pinctrl/Kconfig
>> @@ -133,6 +133,7 @@ config PINCTRL_SANDBOX
>>
>> endif
>>
>> +source "drivers/pinctrl/nxp/Kconfig"
>> source "drivers/pinctrl/uniphier/Kconfig"
>>
>> endmenu
>> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
>> index 70d25dc..dcd20bf 100644
>> --- a/drivers/pinctrl/Makefile
>> +++ b/drivers/pinctrl/Makefile
>> @@ -5,6 +5,7 @@
>> obj-y += pinctrl-uclass.o
>> obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC) += pinctrl-generic.o
>>
>> +obj-y += nxp/
>> obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
>> obj-$(CONFIG_PINCTRL_SANDBOX) += pinctrl-sandbox.o
>>
>> diff --git a/drivers/pinctrl/nxp/Kconfig b/drivers/pinctrl/nxp/Kconfig
>> new file mode 100644
>> index 0000000..2032588
>> --- /dev/null
>> +++ b/drivers/pinctrl/nxp/Kconfig
>> @@ -0,0 +1,10 @@
>> +config PINCTRL_IMX
>> + bool
>> +
>> +config PINCTRL_IMX6
>> + bool "IMX6 pinctrl driver"
>> + depends on ARCH_MX6
>> + select DEVRES
>> + select PINCTRL_IMX
>> + help
>> + Say Y here to enable the imx6ul pinctrl driver
>
>Please can you add a few more details? What features does it support?
>What SoCs use it?
Ok. Will add more details in V2.
>
>> diff --git a/drivers/pinctrl/nxp/Makefile b/drivers/pinctrl/nxp/Makefile
>> new file mode 100644
>> index 0000000..7fd9850
>> --- /dev/null
>> +++ b/drivers/pinctrl/nxp/Makefile
>> @@ -0,0 +1,2 @@
>> +obj-$(CONFIG_PINCTRL_IMX) += pinctrl-imx.o
>> +obj-$(CONFIG_PINCTRL_IMX6) += pinctrl-imx6.o
>> diff --git a/drivers/pinctrl/nxp/pinctrl-imx.c b/drivers/pinctrl/nxp/pinctrl-imx.c
>> new file mode 100644
>> index 0000000..09ffb1b
>> --- /dev/null
>> +++ b/drivers/pinctrl/nxp/pinctrl-imx.c
>> @@ -0,0 +1,224 @@
>> +/*
>> + * Copyright (C) 2016 Peng Fan <van.freenix at gmail.com>
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +
>> +#include <common.h>
>> +#include <mapmem.h>
>> +#include <linux/io.h>
>> +#include <linux/err.h>
>> +#include <dm/device.h>
>> +#include <dm/pinctrl.h>
>> +
>> +#include "pinctrl-imx.h"
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>> +
>> +static int imx_pinctrl_set_state(struct udevice *dev, struct udevice *config)
>> +{
>> + struct imx_pinctrl_priv *priv = dev_get_priv(dev);
>> + struct imx_pinctrl_soc_info *info = priv->info;
>> + int node = config->of_offset;
>> + const struct fdt_property *prop;
>> + unsigned int *pin_data;
>> + int npins, size, pin_size;
>> + int mux_reg, conf_reg, input_reg, input_val, mux_mode, config_val;
>> + int i, j = 0;
>> +
>> + dev_dbg(dev, "%s: %s\n", __func__, config->name);
>> +
>> + if (info->flags & SHARE_MUX_CONF_REG)
>> + pin_size = SHARE_FSL_PIN_SIZE;
>> + else
>> + pin_size = FSL_PIN_SIZE;
>> +
>> + prop = fdt_get_property(gd->fdt_blob, node, "fsl,pins", &size);
>
>fdt_getprop()?
fdt_getprop returns void *, but I need to data entry of the property.
So I use fdt_get_property and use prop->data[x].
Maybe I can use fdt_getprop, if I use fdtdec_get_int_array to get the data.
>
>> + if (!prop) {
>> + dev_err(dev, "No fsl,pins property in node %s\n", config->name);
>> + return -EINVAL;
>> + }
>> +
>> + if (!size || size % pin_size) {
>> + dev_err(dev, "Invalid fsl,pins property in node %s\n",
>> + config->name);
>> + return -EINVAL;
>> + }
>> +
>> + npins = size / pin_size;
>> + pin_data = (unsigned int *)prop->data;
>> +
>> + for (i = 0; i < npins; i++) {
>> + mux_reg = fdt32_to_cpu(pin_data[j++]);
>
>Do you have the binding doc somewhere?
Oh. I'll add the link to refer the linux devicetree binds here.
>
>You might consider using fdtget_get_int_array() if it helps.
Ok. will try this.
>
>> +
>> + if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
>> + mux_reg = -1;
>> +
>> + if (info->flags & SHARE_MUX_CONF_REG) {
>> + conf_reg = mux_reg;
>> + } else {
>> + conf_reg = fdt32_to_cpu(pin_data[j++]);
>> + if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg)
>> + conf_reg = -1;
>> + }
>> +
>> + if ((mux_reg == -1) || (conf_reg == -1)) {
>> + dev_err(dev, "Error mux_reg or conf_reg\n");
>> + return -EINVAL;
>> + }
>> +
>> + input_reg = fdt32_to_cpu(pin_data[j++]);
>> + mux_mode = fdt32_to_cpu(pin_data[j++]);
>> + input_val = fdt32_to_cpu(pin_data[j++]);
>> + config_val = fdt32_to_cpu(pin_data[j++]);
>> +
>> + dev_dbg(dev, "mux_reg 0x%x, conf_reg 0x%x, input_reg 0x%x, "
>> + "mux_mode 0x%x, input_val 0x%x, config_val 0x%x\n",
>> + mux_reg, conf_reg, input_reg, mux_mode, input_val,
>> + config_val);
>> +
>> + if (config_val & IMX_PAD_SION)
>> + mux_mode |= IOMUXC_CONFIG_SION;
>> +
>> + config_val &= ~IMX_PAD_SION;
>> +
>> + /* Set Mux */
>> + if (info->flags & SHARE_MUX_CONF_REG) {
>> + clrsetbits_le32(info->base + mux_reg, 0x7 << 20,
>> + mux_mode << 20);
>> + } else {
>> + writel(mux_mode, info->base + mux_reg);
>> + }
>> +
>> + dev_dbg(dev, "write mux: offset 0x%x val 0x%x\n", mux_reg,
>> + mux_mode);
>> +
>> + /*
>> + * Set select input
>> + *
>> + * If the select input value begins with 0xff, it's a quirky
>> + * select input and the value should be interpreted as below.
>> + * 31 23 15 7 0
>> + * | 0xff | shift | width | select |
>> + * It's used to work around the problem that the select
>> + * input for some pin is not implemented in the select
>> + * input register but in some general purpose register.
>> + * We encode the select input value, width and shift of
>> + * the bit field into input_val cell of pin function ID
>> + * in device tree, and then decode them here for setting
>> + * up the select input bits in general purpose register.
>> + */
>> +
>> + if (input_val >> 24 == 0xff) {
>> + u32 val = input_val;
>> + u8 select = val & 0xff;
>> + u8 width = (val >> 8) & 0xff;
>> + u8 shift = (val >> 16) & 0xff;
>> + u32 mask = ((1 << width) - 1) << shift;
>> + /*
>> + * The input_reg[i] here is actually some IOMUXC general
>> + * purpose register, not regular select input register.
>> + */
>> + val = readl(info->base + input_reg);
>> + val &= ~mask;
>> + val |= select << shift;
>> + writel(val, info->base + input_reg);
>> + } else if (input_reg) {
>> + /*
>> + * Regular select input register can never be at offset
>> + * 0, and we only print register value for regular case.
>> + */
>> + if (info->input_sel_base)
>> + writel(input_val, info->input_sel_base +
>> + input_reg);
>> + else
>> + writel(input_val, info->base + input_reg);
>> +
>> + dev_dbg(dev, "select_input: offset 0x%x val 0x%x\n",
>> + input_reg, input_val);
>> + }
>> +
>> + /* Set config */
>> + if (!(config_val & IMX_NO_PAD_CTL)) {
>> + if (info->flags & SHARE_MUX_CONF_REG) {
>> + clrsetbits_le32(info->base + conf_reg, 0xffff,
>> + config_val);
>> + } else {
>> + writel(config_val, info->base + conf_reg);
>> + }
>> +
>> + dev_dbg(dev, "write config: offset 0x%x val 0x%x\n",
>> + conf_reg, config_val);
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +const struct pinctrl_ops imx_pinctrl_ops = {
>> + .set_state = imx_pinctrl_set_state,
>> +};
>> +
>> +int imx_pinctrl_probe(struct udevice *dev,
>> + struct imx_pinctrl_soc_info *info)
>> +{
>> + struct imx_pinctrl_priv *priv = dev_get_priv(dev);
>> + int node = dev->of_offset, ret;
>> + struct fdtdec_phandle_args arg;
>> + fdt_addr_t addr;
>> + fdt_size_t size;
>> +
>> + if (!info) {
>> + dev_err(dev, "wrong pinctrl info\n");
>> + return -EINVAL;
>> + }
>> +
>> + priv->dev = dev;
>> + priv->info = info;
>> +
>> + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
>> +
>> + if (addr == FDT_ADDR_T_NONE)
>> + return -EINVAL;
>> +
>> + info->base = map_sysmem(addr, size);
>> + if (!info->base)
>> + return -ENOMEM;
>> + priv->info = info;
>> +
>> + if (fdtdec_get_bool(gd->fdt_blob, node, "fsl,input-sel")) {
>> + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob,
>> + node, "fsl,input-sel",
>> + NULL, 0, 0, &arg);
>> + if (ret) {
>> + dev_err(dev, "iomuxc fsl,input-sel property not found\n");
>> + return -EINVAL;
>> + }
>> +
>> + addr = fdtdec_get_addr_size(gd->fdt_blob, arg.node, "reg",
>> + &size);
>> + if (addr == FDT_ADDR_T_NONE)
>> + return -EINVAL;
>> +
>> + info->input_sel_base = map_sysmem(addr, size);
>> + if (!info->input_sel_base)
>> + return -ENOMEM;
>
>This looks a little like something that a syscon or regmap might
>handle. Hard to tell from the code though.
The device tree:
iomuxc_lpsr: iomuxc-lpsr at 302c0000 {
compatible = "fsl,imx7d-iomuxc-lpsr";
reg = <0x302c0000 0x10000>;
fsl,input-sel = <&iomuxc>;
};
iomuxc: iomuxc at 30330000 {
compatible = "fsl,imx7d-iomuxc";
reg = <0x30330000 0x10000>;
};
I followed the linux implementation.
>
>> + }
>> +
>> + dev_info(dev, "initialized IMX pinctrl driver\n");
>> +
>> + return 0;
>> +}
>> +
>> +int imx_pinctrl_remove(struct udevice *dev)
>> +{
>> + struct imx_pinctrl_priv *priv = dev_get_priv(dev);
>> + struct imx_pinctrl_soc_info *info = priv->info;
>> +
>> + if (info->input_sel_base)
>> + unmap_sysmem(info->input_sel_base);
>> + if (info->base)
>> + unmap_sysmem(info->base);
>> +
>> + return 0;
>> +}
>> diff --git a/drivers/pinctrl/nxp/pinctrl-imx.h b/drivers/pinctrl/nxp/pinctrl-imx.h
>> new file mode 100644
>> index 0000000..597c170
>> --- /dev/null
>> +++ b/drivers/pinctrl/nxp/pinctrl-imx.h
>> @@ -0,0 +1,59 @@
>> +/*
>> + * IMX pinmux core definitions
>> + *
>> + * Copyright (C) 2012-2015 Freescale Semiconductor, Inc.
>> + * Copyright (C) 2012 Linaro Ltd.
>> + *
>> + * Author: Dong Aisheng <dong.aisheng at linaro.org>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>
>Can you use SPDX?
Will change this in V2.
>
>> + */
>> +
>> +#ifndef __DRIVERS_PINCTRL_IMX_H
>> +#define __DRIVERS_PINCTRL_IMX_H
>> +
>> +/**
>> + * @base: the address to the controller in virtual memory
>> + * @input_sel_base: the address of the select input in virtual memory.
>> + * @flags: flags specific for each soc
>> + */
>> +struct imx_pinctrl_soc_info {
>> + void __iomem *base;
>> + void __iomem *input_sel_base;
>> + unsigned int flags;
>> +};
>> +
>> +/**
>> + * @dev: a pointer back to containing device
>> + * @info: the soc info
>> + */
>> +struct imx_pinctrl_priv {
>> + struct udevice *dev;
>> + struct imx_pinctrl_soc_info *info;
>> +};
>> +
>> +extern const struct pinctrl_ops imx_pinctrl_ops;
>> +
>> +/* The bits in CONFIG cell defined in binding doc*/
>> +#define IMX_NO_PAD_CTL 0x80000000 /* no pin config need */
>> +#define IMX_PAD_SION 0x40000000 /* set SION */
>> +
>> +/*
>> + * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
>> + * 1 u32 CONFIG, so 24 types in total for each pin.
>> + */
>> +#define FSL_PIN_SIZE 24
>> +#define SHARE_FSL_PIN_SIZE 20
>> +
>> +#define SHARE_MUX_CONF_REG 0x1
>> +#define ZERO_OFFSET_VALID 0x2
>> +
>> +#define IOMUXC_CONFIG_SION (0x1 << 4)
>> +
>> +int imx_pinctrl_probe(struct udevice *dev, struct imx_pinctrl_soc_info *info);
>> +
>> +int imx_pinctrl_remove(struct udevice *dev);
>> +#endif /* __DRIVERS_PINCTRL_IMX_H */
>> diff --git a/drivers/pinctrl/nxp/pinctrl-imx6.c b/drivers/pinctrl/nxp/pinctrl-imx6.c
>> new file mode 100644
>> index 0000000..24f139e
>> --- /dev/null
>> +++ b/drivers/pinctrl/nxp/pinctrl-imx6.c
>> @@ -0,0 +1,41 @@
>> +
>> +/*
>> + * Copyright (C) 2016 Peng Fan <van.freenix at gmail.com>
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +
>> +#include <dm/device.h>
>> +#include <dm/pinctrl.h>
>> +
>> +#include "pinctrl-imx.h"
>> +
>> +static struct imx_pinctrl_soc_info imx6_pinctrl_soc_info;
>> +
>> +static int imx6_pinctrl_probe(struct udevice *dev)
>> +{
>> + struct imx_pinctrl_soc_info *info =
>> + (struct imx_pinctrl_soc_info *)dev_get_driver_data(dev);
>> +
>
>Why are you passing this in? It doesn't seem to have any initialised
>data. Why not use dev_get_priv()?
dev_get_priv returns struct imx_pinctrl_priv *.
And I have this:
struct imx_pinctrl_priv {
struct udevice *dev;
struct imx_pinctrl_soc_info *info;
};
struct imx_pinctrl_soc_info {
void __iomem *base;
void __iomem *input_sel_base;
unsigned int flags;
};
i.MX7 needs the flags entry, but for now i.MX6 does not need the flags entry.
But I think better to keep it.
Thanks,
Peng.
>
>> + return imx_pinctrl_probe(dev, info);
>> +}
>> +
>> +static const struct udevice_id imx6_pinctrl_match[] = {
>> + { .compatible = "fsl,imx6q-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
>> + { .compatible = "fsl,imx6dl-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
>> + { .compatible = "fsl,imx6sl-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
>> + { .compatible = "fsl,imx6sx-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
>> + { .compatible = "fsl,imx6ul-iomuxc", .data = (ulong)&imx6_pinctrl_soc_info },
>> + { /* sentinel */ }
>> +};
>> +
>> +U_BOOT_DRIVER(imx6_pinctrl) = {
>> + .name = "imx6-pinctrl",
>> + .id = UCLASS_PINCTRL,
>> + .of_match = of_match_ptr(imx6_pinctrl_match),
>> + .probe = imx6_pinctrl_probe,
>> + .remove = imx_pinctrl_remove,
>> + .priv_auto_alloc_size = sizeof(struct imx_pinctrl_priv),
>> + .ops = &imx_pinctrl_ops,
>> + .flags = DM_FLAG_PRE_RELOC,
>> +};
>> --
>> 2.6.2
>>
>
>Regards,
>Simon
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