639dd37fd7
This bit is used to specify sdxc pinmap for mt76x8. Details available in patch description. To properly solve this problem and the other pinctrl hack in mtk-mmc driver we'll need to write a dedicated pinctrl driver for mt76x8, with the support for configuring AGPIO_MODE and RGCTL registers as well as specially handling GPIO reservation/pinctrl setup for ESDMODE. Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
56 lines
2.2 KiB
Diff
56 lines
2.2 KiB
Diff
From: Chuanhong Guo <gch981213@gmail.com>
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Date: Sat, 13 Jul 2019 17:59:03 +0800
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Subject: [PATCH] ramips: hack: add esdmode pinctrl group
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Since mt76x8an ver1 eco2, SDXC pins can be switched to the
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following pinmap:
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sd_d1 -> PAD_I2S_SDI
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sd_d0 -> PAD_I2S_WS
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sd_cmd -> PAD_I2S_CLK
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sd_d3 -> PAD_I2C_SCLK
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sd_d2 -> PAD_I2C_SD
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sd_clk -> PAD_GPIO0
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sd_wp -> PAD_TXD1
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sd_cd -> PAD_RXD1
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To use this pinmap, one would need to set ESD_MODE bit (bit 15)
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to 1 in GPIO1_MODE and switch other used pads into GPIO mode.
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MTK called this pinmap "router mode" and the pinmap described
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in their datasheed is called "iot mode".
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This patch is hacky because:
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1. pinmux-rt2880 doesn't support reserving noncontiguous GPIO
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pins so those GPIOs can't be properly reserved.
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2. it misused "gpio" function for "iot mode", due to the fact
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that this mode doesn't reserve any GPIOs.
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Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
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---
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--- a/arch/mips/ralink/mt7620.c
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+++ b/arch/mips/ralink/mt7620.c
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@@ -149,6 +149,7 @@ static struct rt2880_pmx_func refclk_grp
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static struct rt2880_pmx_func perst_grp_mt7628[] = { FUNC("perst", 0, 36, 1) };
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static struct rt2880_pmx_func wdt_grp_mt7628[] = { FUNC("wdt", 0, 38, 1) };
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static struct rt2880_pmx_func spi_grp_mt7628[] = { FUNC("spi", 0, 7, 4) };
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+static struct rt2880_pmx_func esd_mode_grp_mt7628[] = { FUNC("sdxc", 1, 0, 0) };
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static struct rt2880_pmx_func sd_mode_grp_mt7628[] = {
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FUNC("jtag", 3, 22, 8),
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@@ -297,6 +298,7 @@ static struct rt2880_pmx_func wled_an_gr
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#define MT7628_GPIO_MODE_I2C 20
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#define MT7628_GPIO_MODE_REFCLK 18
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#define MT7628_GPIO_MODE_PERST 16
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+#define MT7628_GPIO_MODE_ESDMODE 15
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#define MT7628_GPIO_MODE_WDT 14
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#define MT7628_GPIO_MODE_SPI 12
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#define MT7628_GPIO_MODE_SDMODE 10
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@@ -319,6 +321,7 @@ static struct rt2880_pmx_group mt7628an_
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1, MT7628_GPIO_MODE_I2C),
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GRP("refclk", refclk_grp_mt7628, 1, MT7628_GPIO_MODE_REFCLK),
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GRP("perst", perst_grp_mt7628, 1, MT7628_GPIO_MODE_PERST),
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+ GRP_G("esdmode", esd_mode_grp_mt7628, 1, 0, MT7628_GPIO_MODE_ESDMODE),
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GRP("wdt", wdt_grp_mt7628, 1, MT7628_GPIO_MODE_WDT),
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GRP("spi", spi_grp_mt7628, 1, MT7628_GPIO_MODE_SPI),
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GRP_G("sdmode", sd_mode_grp_mt7628, MT7628_GPIO_MODE_MASK,
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