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SubjectRe: [PATCH 2/2] HISI LPC: Add ACPI UART support
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On Thu, 2018-05-03 at 23:08 +0800, John Garry wrote:
> On the Huawei D03 development board the system UART is
> the UART connected on the LPC bus.
>
> The profile for the device driver required for this HW
> would be as follows:
> - platform driver
> - supports 16550
> - supports ACPI
> - supports polling mode
> - supports IO space
>
> In principle we should use the PNP driver (8250_dw.c) for
> 8250-devices with ACPI FW. However since this host driver
> does not support PNP devices, and modifying the PNP core
> code to support it is not worth the effort, use the generic
> 8250 isa driver.
>
> For this, we need to setup the MFD cell platform data for
> a serial 8250 Port.
>
> In addition to this change, we also make the following
> changes:
> - set child ACPI device as enumerated. This fixes a conflict
> in serdev setup for the UART
> - use platform device ID auto for creating the uart child
> platform device to avoid conflict with platform devices
> created for serial8250_isa_devs from 8250_core.c

> + mfd_cell->platform_data = devm_kmemdup(hostdev, &ref_port,
> + sizeof(ref_port),
> GFP_KERNEL);

Isn't this done by MFD core?


--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

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