linux-kernel - [PATCH v3 2/2] serial: 8250: Apply FSL workarounds also without SERIAL_8250

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Message-Id: <20230605130857.85543-3-u.kleine-koenig@pengutronix.de>
Date:   Mon,  5 Jun 2023 15:08:57 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     kernel@...gutronix.de, Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
        Rob Herring <robh@...nel.org>, Helge Deller <deller@....de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Liang He <windhl@....com>, linuxppc-dev@...ts.ozlabs.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] serial: 8250: Apply FSL workarounds also without SERIAL_8250_CONSOLE

The need to handle the FSL variant of 8250 in a special way is also
present without console support. So soften the dependency for
SERIAL_8250_FSL accordingly. Note that with the 8250 driver compiled as
a module, some devices still might not make use of the needed
workarounds. That affects the ports instantiated in
arch/powerpc/kernel/legacy_serial.c.

This issue was identified by Dominik Andreas Schorpp.

To cope for CONFIG_SERIAL_8250=m + CONFIG_SERIAL_8250_FSL=y, 8250_fsl.o
must be put in the same compilation unit as 8250_port.o because the
latter defines some functions needed in the former and so 8250_fsl.o
must not be built-in if 8250_port.o is available in a module.

Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Link: https://lore.kernel.org/r/20230531083230.2702181-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/tty/serial/8250/Kconfig  | 2 +-
 drivers/tty/serial/8250/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 5313aa31930f..10c09b19c871 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -378,7 +378,7 @@ config SERIAL_8250_BCM2835AUX
 
 config SERIAL_8250_FSL
 	bool "Freescale 16550 UART support" if COMPILE_TEST && !(PPC || ARM || ARM64)
-	depends on SERIAL_8250_CONSOLE
+	depends on SERIAL_8250
 	default PPC || ARM || ARM64
 	help
 	  Selecting this option enables a workaround for a break-detection
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 4fc2fc1f41b6..8824ba5295b6 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_SERIAL_8250)		+= 8250.o 8250_base.o
 8250_base-$(CONFIG_SERIAL_8250_DMA)	+= 8250_dma.o
 8250_base-$(CONFIG_SERIAL_8250_DWLIB)	+= 8250_dwlib.o
 8250_base-$(CONFIG_SERIAL_8250_FINTEK)	+= 8250_fintek.o
+8250_base-$(CONFIG_SERIAL_8250_FSL)	+= 8250_fsl.o
 8250_base-$(CONFIG_SERIAL_8250_PCILIB)	+= 8250_pcilib.o
 obj-$(CONFIG_SERIAL_8250_PARISC)	+= 8250_parisc.o
 obj-$(CONFIG_SERIAL_8250_PCI)		+= 8250_pci.o
@@ -28,7 +29,6 @@ obj-$(CONFIG_SERIAL_8250_BOCA)		+= 8250_boca.o
 obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554)	+= 8250_exar_st16c554.o
 obj-$(CONFIG_SERIAL_8250_HUB6)		+= 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_PCI1XXXX)	+= 8250_pci1xxxx.o
-obj-$(CONFIG_SERIAL_8250_FSL)		+= 8250_fsl.o
 obj-$(CONFIG_SERIAL_8250_MEN_MCB)	+= 8250_men_mcb.o
 obj-$(CONFIG_SERIAL_8250_DFL)		+= 8250_dfl.o
 obj-$(CONFIG_SERIAL_8250_DW)		+= 8250_dw.o
-- 
2.39.2