linux-kernel - [PATCH] mmc: sdhci-of-at91: make MMC_SDHCI_OF_AT91 depend on HAVE

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Date:   Thu, 23 Apr 2020 00:34:01 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Jeffery <andrew@...id.au>,
        Baolin Wang <baolin.wang@...aro.org>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        Faiz Abbas <faiz_abbas@...com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Takao Orito <orito.takao@...ionext.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        YueHaibing <yuehaibing@...wei.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: sdhci-of-at91: make MMC_SDHCI_OF_AT91 depend on HAVE_CLK

If sdhci-of-at91.c is compiled without CONFIG_HAVE_CLK, the line

  caps1 |= FIELD_PREP(SDHCI_CLOCK_MUL_MASK, clk_mul);

... emits "FIELD_PREP: value too large for the field" warning.

The compiler seems to decide clk_mul is constant (unsigned int)-1,
because clk_get_rate() returns 0 when CONFIG_HAVE_CLK is disabled.

Add HAVE_CLK to the depenency since this driver does not work without
the clock APIs anyway.

Link: https://lkml.org/lkml/2020/4/17/613
Fixes: linux-next ("mmc: sdhci: use FIELD_GET/PREP for capabilities bit masks")
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Suggested-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Ulf,

I do not know how to fill the Fixes tag.
It is currently 8da1ff4f68a2 in linux-next, but I am not sure it is
stable. I just added 'linux-next'.

If you have a preferred way, please modify it.





 drivers/mmc/host/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 462b5352fea7..2aee844722d6 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -171,7 +171,7 @@ config MMC_SDHCI_OF_ASPEED
 config MMC_SDHCI_OF_AT91
 	tristate "SDHCI OF support for the Atmel SDMMC controller"
 	depends on MMC_SDHCI_PLTFM
-	depends on OF
+	depends on OF && HAVE_CLK
 	help
 	  This selects the Atmel SDMMC driver
 
-- 
2.25.1