linux-kernel - [PATCH] mmc: sdhci-of-esdhc: limit the SDHC clock frequency

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Date:   Fri,  2 Dec 2022 15:59:05 +0800
From:   andy.tang@....com
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Tang <andy.tang@....com>
Subject: [PATCH] mmc: sdhci-of-esdhc: limit the SDHC clock frequency

From: Andy Tang <andy.tang@....com>

The highest clock frequency for eMMC HS200 mode on ls1043a
is 116.7Mhz according to its specification.
So add the limit to gate the frequency.

Signed-off-by: Andy Tang <andy.tang@....com>
---
v2: change the author to andy tang

 drivers/mmc/host/sdhci-of-esdhc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 00542dd74c07..1fd4ae10862d 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -43,6 +43,12 @@ static const struct esdhc_clk_fixup ls1021a_esdhc_clk = {
 	.max_clk[MMC_TIMING_SD_HS] = 46500000,
 };
 
+static const struct esdhc_clk_fixup ls1043a_esdhc_clk = {
+	.sd_dflt_max_clk = 25000000,
+	.max_clk[MMC_TIMING_UHS_SDR104] = 116700000,
+	.max_clk[MMC_TIMING_MMC_HS200] = 116700000,
+};
+
 static const struct esdhc_clk_fixup ls1046a_esdhc_clk = {
 	.sd_dflt_max_clk = 25000000,
 	.max_clk[MMC_TIMING_UHS_SDR104] = 167000000,
@@ -64,6 +70,7 @@ static const struct esdhc_clk_fixup p1010_esdhc_clk = {
 
 static const struct of_device_id sdhci_esdhc_of_match[] = {
 	{ .compatible = "fsl,ls1021a-esdhc", .data = &ls1021a_esdhc_clk},
+	{ .compatible = "fsl,ls1043a-esdhc", .data = &ls1043a_esdhc_clk},
 	{ .compatible = "fsl,ls1046a-esdhc", .data = &ls1046a_esdhc_clk},
 	{ .compatible = "fsl,ls1012a-esdhc", .data = &ls1012a_esdhc_clk},
 	{ .compatible = "fsl,p1010-esdhc",   .data = &p1010_esdhc_clk},
-- 
2.25.1