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Message-ID: <1591326240-28928-1-git-send-email-skomatineni@nvidia.com>
Date: Thu, 4 Jun 2020 20:04:00 -0700
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
<thierry.reding@...il.com>, <jonathanh@...dia.com>
CC: <skomatineni@...dia.com>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
Subject: [PATCH] sdhci: tegra: Add comment for PADCALIB and PAD_CONTROL NVQUIRKS
This patch adds comments about NVQUIRKS HAS_PADCALIB and NEEDS_PAD_CONTROL.
Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
drivers/mmc/host/sdhci-tegra.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 3a372ab..0a3f9d0 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -96,7 +96,16 @@
#define NVQUIRK_ENABLE_SDR50 BIT(3)
#define NVQUIRK_ENABLE_SDR104 BIT(4)
#define NVQUIRK_ENABLE_DDR50 BIT(5)
+/*
+ * HAS_PADCALIB NVQUIRK is for SoC's supporting auto calibration of pads
+ * drive strength.
+ */
#define NVQUIRK_HAS_PADCALIB BIT(6)
+/*
+ * NEEDS_PAD_CONTROL NVQUIRK is for SoC's having separate 3V3 and 1V8 pads.
+ * 3V3/1V8 pad selection happens through pinctrl state selection depending
+ * on the signaling mode.
+ */
#define NVQUIRK_NEEDS_PAD_CONTROL BIT(7)
#define NVQUIRK_DIS_CARD_CLK_CONFIG_TAP BIT(8)
#define NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING BIT(9)
--
2.7.4
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