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From:   Baoquan He <bhe@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     akpm@linux-foundation.org, linux-mm@kvack.org,
        schnelle@linux.ibm.com, vkoul@kernel.org, eli.billauer@gmail.com,
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        pabeni@redhat.com, tglx@linutronix.de, maz@kernel.org,
        mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org,
        frowand.list@gmail.com, Baoquan He <bhe@redhat.com>,
        kernel test robot <lkp@intel.com>, linux-clk@vger.kernel.org
Subject: [PATCH 7/8] clk: fixed-mmio: make COMMON_CLK_FIXED_MMIO depend on HAS_IOMEM
Date:   Fri,  7 Jul 2023 21:58:51 +0800
Message-Id: <20230707135852.24292-8-bhe@redhat.com>
In-Reply-To: <20230707135852.24292-1-bhe@redhat.com>
References: <20230707135852.24292-1-bhe@redhat.com>
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Precedence: bulk

On s390 systems (aka mainframes), it has classic channel devices for
networking and permanent storage that are currently even more common
than PCI devices. Hence it could have a fully functional s390 kernel
with CONFIG_PCI=n, then the relevant iomem mapping functions
[including ioremap(), devm_ioremap(), etc.] are not available.

Here let COMMON_CLK_FIXED_MMIO depend on HAS_IOMEM so that it won't
be built to cause below compiling error if PCI is unset:

------
ld: drivers/clk/clk-fixed-mmio.o: in function `fixed_mmio_clk_setup':
clk-fixed-mmio.c:(.text+0x5e): undefined reference to `of_iomap'
ld: clk-fixed-mmio.c:(.text+0xba): undefined reference to `iounmap'
------

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202306211329.ticOJCSv-lkp@intel.com/
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
---
 drivers/clk/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 93f38a8178ba..6b3b424addab 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -444,6 +444,7 @@ config COMMON_CLK_BD718XX
 config COMMON_CLK_FIXED_MMIO
 	bool "Clock driver for Memory Mapped Fixed values"
 	depends on COMMON_CLK && OF
+	depends on HAS_IOMEM
 	help
 	  Support for Memory Mapped IO Fixed clocks
 
-- 
2.34.1