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i3c: mipi-i3c-hci: Allow for Multi-Bus Instances 

Add support for MIPI I3C Host Controllers with the Multi-Bus Instance
capability.  These controllers can host multiple I3C buses (up to 15)
within a single hardware function (e.g., PCIe B/D/F), providing one
indepedent HCI register set and corresponding I3C bus controller logic
per bus.

A separate platform device will represent each instance, but it is
necessary to allow for shared resources.

Multi-bus instances share the same MMIO address space, but the ranges are
not guaranteed to be contiguous. To avoid overlapping mappings, pass
base_regs from the parent mapping to child devices.

Allow the IRQ to be shared among instances.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260106164416.67074-8-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter 2026-01-06 18:44:12 +02:00 committed by Alexandre Belloni
parent 35c0bfe8fd
commit b8460480f6
2 changed files with 32 additions and 4 deletions
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21
drivers/i3c/master/mipi-i3c-hci/core.c
View File

@ -14,6 +14,7 @@
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_data/mipi-i3c-hci.h>
#include <linux/platform_device.h>
#include "hci.h"
@ -737,15 +738,27 @@ static int i3c_hci_init(struct i3c_hci *hci)
static int i3c_hci_probe(struct platform_device *pdev)
{
const struct mipi_i3c_hci_platform_data *pdata = pdev->dev.platform_data;
struct i3c_hci *hci;
int irq, ret;
hci = devm_kzalloc(&pdev->dev, sizeof(*hci), GFP_KERNEL);
if (!hci)
return -ENOMEM;
hci->base_regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(hci->base_regs))
return PTR_ERR(hci->base_regs);
/*
* Multi-bus instances share the same MMIO address range, but not
* necessarily in separate contiguous sub-ranges. To avoid overlapping
* mappings, provide base_regs from the parent mapping.
*/
if (pdata)
hci->base_regs = pdata->base_regs;
if (!hci->base_regs) {
hci->base_regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(hci->base_regs))
return PTR_ERR(hci->base_regs);
}
platform_set_drvdata(pdev, hci);
/* temporary for dev_printk's, to be replaced in i3c_master_register */
@ -759,7 +772,7 @@ static int i3c_hci_probe(struct platform_device *pdev)
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, irq, i3c_hci_irq_handler,
0, NULL, hci);
IRQF_SHARED, NULL, hci);
if (ret)
return ret;

15
include/linux/platform_data/mipi-i3c-hci.h Normal file
View File

@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef INCLUDE_PLATFORM_DATA_MIPI_I3C_HCI_H
#define INCLUDE_PLATFORM_DATA_MIPI_I3C_HCI_H
#include <linux/compiler_types.h>
/**
* struct mipi_i3c_hci_platform_data - Platform-dependent data for mipi_i3c_hci
* @base_regs: Register set base address (to support multi-bus instances)
*/
struct mipi_i3c_hci_platform_data {
void __iomem *base_regs;
};
#endif