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Date: Fri, 31 May 2024 12:05:50 +0100
From: Lee Jones <lee@...nel.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Linus Walleij <linus.walleij@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
linux-mips@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
linux-gpio@...r.kernel.org,
Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
Gregory CLEMENT <gregory.clement@...tlin.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH v2 06/11] mfd: olb: Add support for Mobileye OLB
system-controller
On Fri, 03 May 2024, Théo Lebrun wrote:
> Mobileye OLB system-controller gets used in EyeQ5, EyeQ6L and EyeQ6H
> platforms. It hosts clock, reset and pinctrl functionality.
>
> Tiny iomem resources are declared for all cells. Some features are
> spread apart. Pinctrl is only used on EyeQ5.
>
> EyeQ6H is special: it hosts seven OLB controllers, each with a
> compatible. That means many clock and reset cells. Use cell->devname
> for explicit device names rather than clk-eyeq.ID or clk-eyeq.ID.auto.
>
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
> drivers/mfd/Kconfig | 10 +++
> drivers/mfd/Makefile | 2 +
> drivers/mfd/mobileye-olb.c | 180 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 192 insertions(+)
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 4b023ee229cf..d004a3f4d493 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1030,6 +1030,16 @@ config MFD_OCELOT
>
> If unsure, say N.
>
> +config MFD_OLB
> + bool "Mobileye EyeQ OLB System Controller Support"
> + select MFD_CORE
> + depends on MACH_EYEQ5 || MACH_EYEQ6H || COMPILE_TEST
> + default MACH_EYEQ5 || MACH_EYEQ6H
> + help
> + Say yes here to add support for EyeQ platforms (EyeQ5, EyeQ6L and
> + EyeQ6H). This core MFD platform driver provides clock, reset and
> + pinctrl (only EyeQ5) support.
> +
> config EZX_PCAP
> bool "Motorola EZXPCAP Support"
> depends on SPI_MASTER
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index c66f07edcd0e..d872833966a8 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -120,6 +120,8 @@ obj-$(CONFIG_MFD_CORE) += mfd-core.o
> ocelot-soc-objs := ocelot-core.o ocelot-spi.o
> obj-$(CONFIG_MFD_OCELOT) += ocelot-soc.o
>
> +obj-$(CONFIG_MFD_OLB) += mobileye-olb.o
> +
> obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o
> obj-$(CONFIG_MFD_CPCAP) += motorola-cpcap.o
>
> diff --git a/drivers/mfd/mobileye-olb.c b/drivers/mfd/mobileye-olb.c
> new file mode 100644
> index 000000000000..1640d63a3ddd
> --- /dev/null
> +++ b/drivers/mfd/mobileye-olb.c
> @@ -0,0 +1,180 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * System controller multi-function device for EyeQ platforms.
> + *
> + * Mobileye EyeQ5, EyeQ6L and EyeQ6H platforms have MMIO mapped registers
> + * controlling core platform clocks, resets and pin control. Many other
> + * features are present and not yet exposed.
> + *
> + * Declare cells for each compatible. Only EyeQ5 has pinctrl.
> + * EyeQ6H has seven OLB instances; each has a name which we propagate to
> + * sub-devices using cell->devname.
> + *
> + * Copyright (C) 2024 Mobileye Vision Technologies Ltd.
> + */
> +
> +#include <linux/array_size.h>
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/ioport.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +
> +#define OLB_MFD_CELL(_name, _res, _devname) \
> + MFD_CELL_ALL(_name, _res, NULL, 0, 0, NULL, 0, false, NULL, _devname)
The reason we provide generic MACROs is so that you don't have to define
your own.
> +struct olb_match_data {
> + const struct mfd_cell *cells;
> + int nb_cells; /* int to match devm_mfd_add_devices() argument */
> +};
> +
> +#define OLB_DATA(_cells) { .cells = (_cells), .nb_cells = ARRAY_SIZE(_cells) }
> +
> +static int olb_probe(struct platform_device *pdev)
> +{
> + const struct olb_match_data *match_data;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> +
> + match_data = device_get_match_data(dev);
> + if (!match_data)
> + return -ENODEV;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> +
> + return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
> + match_data->cells, match_data->nb_cells,
> + res, 0, NULL);
> +}
> +
> +static const struct resource olb_eyeq5_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x02C, 10 * 8, "pll"),
> + DEFINE_RES_MEM_NAMED(0x11C, 1 * 4, "ospi"),
> +};
> +
> +static const struct resource olb_eyeq5_reset_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x004, 2 * 4, "d0"),
> + DEFINE_RES_MEM_NAMED(0x200, 13 * 4, "d1"),
> + DEFINE_RES_MEM_NAMED(0x120, 1 * 4, "d2"),
> +};
> +
> +static const struct resource olb_eyeq5_pinctrl_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x0B0, 12 * 4, "pinctrl"),
> +};
> +
> +static const struct mfd_cell olb_eyeq5_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq5_clk_resources, NULL),
> + OLB_MFD_CELL("reset-eyeq", olb_eyeq5_reset_resources, NULL),
> + OLB_MFD_CELL("eyeq5-pinctrl", olb_eyeq5_pinctrl_resources, NULL),
> +};
> +
> +static const struct olb_match_data olb_eyeq5_match_data = OLB_DATA(olb_eyeq5_cells);
> +
> +static const struct resource olb_eyeq6l_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x02C, 4 * 8, "pll"),
> +};
> +
> +static const struct resource olb_eyeq6l_reset_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x004, 2 * 4, "d0"),
> + DEFINE_RES_MEM_NAMED(0x200, 13 * 4, "d1"),
> +};
> +
> +static const struct mfd_cell olb_eyeq6l_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6l_clk_resources, NULL),
> + OLB_MFD_CELL("reset-eyeq", olb_eyeq6l_reset_resources, NULL),
> +};
> +
> +static const struct olb_match_data olb_eyeq6l_match_data = OLB_DATA(olb_eyeq6l_cells);
> +
> +static const struct resource olb_eyeq6h_acc_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x040, 7 * 8, "pll"),
> +};
> +
> +static const struct resource olb_eyeq6h_acc_reset_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x000, 15 * 4, "d0"),
> +};
> +
> +static const struct mfd_cell olb_eyeq6h_acc_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_acc_clk_resources, "clk-eyeq-acc"),
The point of enumerating platform device names is to identify devices
that are identical. We lose this with bespoke naming.
If you want to identify devices either define a value to pass to .id or
adapt the first parameter and make the clk-eyeq driver accept different
device names.
> + OLB_MFD_CELL("reset-eyeq", olb_eyeq6h_acc_reset_resources, "reset-eyeq-acc"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_acc_match_data = OLB_DATA(olb_eyeq6h_acc_cells);
> +
> +static const struct resource olb_eyeq6h_we_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x074, 1 * 8, "pll"),
> +};
> +
> +static const struct resource olb_eyeq6h_we_reset_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x004, 4 * 4, "d0"),
> +};
> +
> +static const struct mfd_cell olb_eyeq6h_west_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_we_clk_resources, "clk-eyeq-west"),
> + OLB_MFD_CELL("reset-eyeq", olb_eyeq6h_we_reset_resources, "reset-eyeq-west"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_west_match_data = OLB_DATA(olb_eyeq6h_west_cells);
> +
> +static const struct mfd_cell olb_eyeq6h_east_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_we_clk_resources, "clk-eyeq-east"),
> + OLB_MFD_CELL("reset-eyeq", olb_eyeq6h_we_reset_resources, "reset-eyeq-east"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_east_match_data = OLB_DATA(olb_eyeq6h_east_cells);
> +
> +static const struct resource olb_eyeq6h_south_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x000, 4 * 8, "pll"),
> + DEFINE_RES_MEM_NAMED(0x070, 1 * 4, "emmc"),
> + DEFINE_RES_MEM_NAMED(0x090, 1 * 4, "ospi"),
> + DEFINE_RES_MEM_NAMED(0x098, 1 * 4, "tsu"),
> +};
> +
> +static const struct mfd_cell olb_eyeq6h_south_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_south_clk_resources, "clk-eyeq-south"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_south_match_data = OLB_DATA(olb_eyeq6h_south_cells);
> +
> +static const struct resource olb_eyeq6h_ddr_clk_resources[] = {
> + DEFINE_RES_MEM_NAMED(0x074, 1 * 8, "pll"),
> +};
> +
> +static const struct mfd_cell olb_eyeq6h_ddr0_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_ddr_clk_resources, "clk-eyeq-ddr0"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_ddr0_match_data = OLB_DATA(olb_eyeq6h_ddr0_cells);
> +
> +static const struct mfd_cell olb_eyeq6h_ddr1_cells[] = {
> + OLB_MFD_CELL("clk-eyeq", olb_eyeq6h_ddr_clk_resources, "clk-eyeq-ddr1"),
> +};
> +
> +static const struct olb_match_data olb_eyeq6h_ddr1_match_data = OLB_DATA(olb_eyeq6h_ddr1_cells);
> +
> +static const struct of_device_id olb_of_match[] = {
> + { .compatible = "mobileye,eyeq5-olb", .data = &olb_eyeq5_match_data },
We're not passing MFD init data through the OF API, sorry.
Pass defined identifiers through instead and match on those please.
> + { .compatible = "mobileye,eyeq6l-olb", .data = &olb_eyeq6l_match_data },
> + { .compatible = "mobileye,eyeq6h-acc-olb", .data = &olb_eyeq6h_acc_match_data },
> + /* No central: it only has an early clock handled using CLK_OF_DECLARE_DRIVER(). */
> + { .compatible = "mobileye,eyeq6h-east-olb", .data = &olb_eyeq6h_east_match_data },
> + { .compatible = "mobileye,eyeq6h-west-olb", .data = &olb_eyeq6h_west_match_data },
> + { .compatible = "mobileye,eyeq6h-south-olb", .data = &olb_eyeq6h_south_match_data },
> + { .compatible = "mobileye,eyeq6h-ddr0-olb", .data = &olb_eyeq6h_ddr0_match_data },
> + { .compatible = "mobileye,eyeq6h-ddr1-olb", .data = &olb_eyeq6h_ddr1_match_data },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, olb_of_match);
> +
> +static struct platform_driver olb_driver = {
> + .probe = olb_probe,
> + .driver = {
> + .name = "olb",
> + .of_match_table = olb_of_match,
> + },
> +};
> +builtin_platform_driver(olb_driver);
>
> --
> 2.45.0
>
--
Lee Jones [李琼斯]
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