linux-kernel - [PATCH v3 2/4] mfd: intel-m10-bmc: Simplify the legacy version reg definition

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Message-Id: <1614578385-26955-3-git-send-email-yilun.xu@intel.com>
Date:   Mon,  1 Mar 2021 13:59:43 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     lee.jones@...aro.org, linux-kernel@...r.kernel.org
Cc:     trix@...hat.com, yilun.xu@...el.com,
        matthew.gerlach@...ux.intel.com, russell.h.weight@...el.com,
        lgoncalv@...hat.com, hao.wu@...el.com
Subject: [PATCH v3 2/4] mfd: intel-m10-bmc: Simplify the legacy version reg definition

The version register is the only one in the legacy I/O space to be
accessed, so it is not necessary to define the legacy base & version
register offset. A direct definition of the legacy version register
address would be fine.

Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Reviewed-by: Tom Rix <trix@...hat.com>
---
v3: no change, rebased to 5.12-rc1
---
 drivers/mfd/intel-m10-bmc.c       | 12 +++++-------
 include/linux/mfd/intel-m10-bmc.h |  2 +-
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
index 06c9775..0d2c03f 100644
--- a/drivers/mfd/intel-m10-bmc.c
+++ b/drivers/mfd/intel-m10-bmc.c
@@ -117,16 +117,14 @@ static int check_m10bmc_version(struct intel_m10bmc *ddata)
 
 	/*
 	 * This check is to filter out the very old legacy BMC versions,
-	 * M10BMC_LEGACY_SYS_BASE is the offset to this old block of mmio
-	 * registers. In the old BMC chips, the BMC version info is stored
-	 * in this old version register (M10BMC_LEGACY_SYS_BASE +
-	 * M10BMC_BUILD_VER), so its read out value would have not been
-	 * LEGACY_INVALID (0xffffffff). But in new BMC chips that the
+	 * 0x300400 is the offset to this old block of mmio registers. In the
+	 * old BMC chips, the BMC version info is stored in this old version
+	 * register (0x300400 + 0x68), so its read out value would have not
+	 * been LEGACY_INVALID (0xffffffff). But in new BMC chips that the
 	 * driver supports, the value of this register should be
 	 * LEGACY_INVALID.
 	 */
-	ret = m10bmc_raw_read(ddata,
-			      M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
+	ret = m10bmc_raw_read(ddata, M10BMC_LEGACY_BUILD_VER, &v);
 	if (ret)
 		return -ENODEV;
 
diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
index 9b54ca1..4f1071f 100644
--- a/include/linux/mfd/intel-m10-bmc.h
+++ b/include/linux/mfd/intel-m10-bmc.h
@@ -9,7 +9,7 @@
 
 #include <linux/regmap.h>
 
-#define M10BMC_LEGACY_SYS_BASE		0x300400
+#define M10BMC_LEGACY_BUILD_VER		0x300468
 #define M10BMC_SYS_BASE			0x300800
 #define M10BMC_MEM_END			0x1fffffff
 
-- 
2.7.4