diff --git a/arch/arm64/boot/dts/amlogic/g12a_pxp.dts b/arch/arm64/boot/dts/amlogic/g12a_pxp.dts
index fd6ea3dcde4f..e2a41d47bd24 100644
--- a/arch/arm64/boot/dts/amlogic/g12a_pxp.dts
+++ b/arch/arm64/boot/dts/amlogic/g12a_pxp.dts
@@ -108,6 +108,50 @@
 		};
 	};
 
+	sd_emmc_b:sd@ffe05000 {
+		status = "okay";
+		compatible = "amlogic, meson-mmc-g12a";
+		reg = <0x0 0xffe05000 0x0 0x2000>;
+		interrupts = <0 190 1>;
+
+		pinctrl-names = "sd_clk_cmd_pins", "sd_all_pins";
+		pinctrl-0 = <&sd_clk_cmd_pins>;
+		pinctrl-1 = <&sd_all_pins>;
+
+		clocks = <&clkc CLKID_SD_EMMC_B>,
+			<&clkc CLKID_SD_EMMC_B_P0_COMP>,
+			<&clkc CLKID_FCLK_DIV2>,
+			<&clkc CLKID_FCLK_DIV5>;
+		clock-names = "core", "clkin0", "clkin1", "clkin2";
+
+		bus-width = <4>;
+		cap-sd-highspeed;
+		cap-mmc-highspeed;
+		max-frequency = <100000000>;
+		non-removable;
+		disable-wp;
+		sd {
+			pinname = "sd";
+			ocr_avail = <0x200080>; /**VDD voltage 3.3 ~ 3.4 */
+			caps = "MMC_CAP_4_BIT_DATA",
+				 "MMC_CAP_MMC_HIGHSPEED",
+				 "MMC_CAP_SD_HIGHSPEED",
+				 "MMC_CAP_NONREMOVABLE",
+				 "MMC_CAP_UHS_SDR12",
+				 "MMC_CAP_UHS_SDR25",
+				 "MMC_CAP_UHS_SDR50",
+				 "MMC_PM_KEEP_POWER",
+				 "MMC_CAP_NONREMOVABLE"; /**ptm debug */
+			f_min = <400000>;
+			f_max = <200000000>;
+			max_req_size = <0x20000>; /**128KB*/
+			card_type = <5>;
+			/* 3:sdio device(ie:sdio-wifi),
+			 * 4:SD combo (IO+mem) card
+			 */
+		};
+	};
+
 	canvas{
 		compatible = "amlogic, meson, canvas";
 		dev_name = "amlogic-canvas";
diff --git a/arch/arm64/boot/dts/amlogic/mesong12a.dtsi b/arch/arm64/boot/dts/amlogic/mesong12a.dtsi
index eb111e574f84..959d39a3112d 100644
--- a/arch/arm64/boot/dts/amlogic/mesong12a.dtsi
+++ b/arch/arm64/boot/dts/amlogic/mesong12a.dtsi
@@ -500,5 +500,28 @@
 };
 
 &pinctrl_periphs {
+	/* sdemmc portB */
+	sd_clk_cmd_pins:sd_clk_cmd_pins {
+		mux {
+			groups = "sdcard_cmd_c",
+				   "sdcard_clk_c";
+			function = "sdcard";
+			input-enable;
+			bias-pull-up;
+		};
+	};
 
+	sd_all_pins:sd_all_pins {
+		mux {
+			groups = "sdcard_d0_c",
+				   "sdcard_d1_c",
+				   "sdcard_d2_c",
+				   "sdcard_d3_c",
+				   "sdcard_cmd_c",
+				   "sdcard_clk_c";
+			function = "sdcard";
+			input-enable;
+			bias-pull-up;
+		};
+	};
 };
diff --git a/drivers/amlogic/mmc/aml_sd_emmc.c b/drivers/amlogic/mmc/aml_sd_emmc.c
index 70cd83ba318c..62bda6ce2ead 100644
--- a/drivers/amlogic/mmc/aml_sd_emmc.c
+++ b/drivers/amlogic/mmc/aml_sd_emmc.c
@@ -2932,6 +2932,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (aml_card_type_sdio(pdata)) /* if sdio_wifi */
 		sdio_host = mmc;
 
+#ifndef CONFIG_MESON_CPU_EMULATOR
+	/* disable sdcard detect irq for ptm */
 	/*Register card detect irq : plug in & unplug*/
 	if (pdata->gpio_cd && aml_card_type_non_sdio(pdata)) {
 		mutex_init(&pdata->in_out_lock);
@@ -2952,6 +2954,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 		schedule_delayed_work(&host->cd_work, 50);
 #endif
 	}
+#endif /* CONFIG_MESON_CPU_EMULATOR */
 	pr_info("%s() : success!\n", __func__);
 	return 0;
 
@@ -3064,6 +3067,15 @@ static struct meson_mmc_data mmc_data_txhd = {
 	.ds_pin_poll_bit = 11,
 };
 
+static struct meson_mmc_data mmc_data_g12a = {
+	.chip_type = MMC_CHIP_G12A,
+	.pinmux_base = 0xff634400,
+	.clksrc_base = 0xff63c000,
+	.ds_pin_poll = 0x3a,
+	.ds_pin_poll_en = 0x48,
+	.ds_pin_poll_bit = 13,
+};
+
 static const struct of_device_id meson_mmc_of_match[] = {
 	{
 		.compatible = "amlogic, meson-mmc-gxbb",
@@ -3101,6 +3113,10 @@ static const struct of_device_id meson_mmc_of_match[] = {
 		.compatible = "amlogic, meson-mmc-txhd",
 		.data = &mmc_data_txhd,
 	},
+	{
+		.compatible = "amlogic, meson-mmc-g12a",
+		.data = &mmc_data_g12a,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
diff --git a/drivers/amlogic/mmc/aml_sd_emmc_v3.c b/drivers/amlogic/mmc/aml_sd_emmc_v3.c
index 0e718f4233d4..2f2b3c40c92e 100644
--- a/drivers/amlogic/mmc/aml_sd_emmc_v3.c
+++ b/drivers/amlogic/mmc/aml_sd_emmc_v3.c
@@ -52,10 +52,11 @@ int meson_mmc_clk_init_v3(struct amlsd_host *host)
 	struct amlsd_platform *pdata = host->pdata;
 
 	writel(0, host->base + SD_EMMC_CLOCK_V3);
+#ifndef SD_EMMC_CLK_CTRL
 	ret = aml_emmc_clktree_init(host);
 	if (ret)
 		return ret;
-
+#endif
 	/* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
 	vclkc = 0;
 	pclkc->div = 60;	 /* 400KHz */
@@ -92,11 +93,12 @@ static int meson_mmc_clk_set_rate_v3(struct amlsd_host *host,
 	struct mmc_host *mmc = host->mmc;
 	struct amlsd_platform *pdata = host->pdata;
 	int ret = 0;
-	struct clk *src0_clk = NULL;
+
 #ifdef SD_EMMC_CLK_CTRL
 	u32 clk_rate, clk_div, clk_src_sel;
 	struct amlsd_platform *pdata = host->pdata;
 #else
+	struct clk *src0_clk = NULL;
 	u32 vcfg = 0;
 	struct sd_emmc_config *conf = (struct sd_emmc_config *)&vcfg;
 #endif
diff --git a/drivers/amlogic/mmc/amlsd.c b/drivers/amlogic/mmc/amlsd.c
index fe6c6cd63750..178a2c9829ab 100644
--- a/drivers/amlogic/mmc/amlsd.c
+++ b/drivers/amlogic/mmc/amlsd.c
@@ -397,6 +397,7 @@ void aml_devm_pinctrl_put(struct amlsd_host *host)
 	}
 }
 
+#ifndef SD_EMMC_PIN_CTRL
 static struct pinctrl * __must_check aml_devm_pinctrl_get_select(
 				struct amlsd_host *host, const char *name)
 {
@@ -429,6 +430,34 @@ static struct pinctrl * __must_check aml_devm_pinctrl_get_select(
 	}
 	return p;
 }
+#else /* SD_EMMC_PIN_CTRL */
+static struct pinctrl * __must_check aml_devm_pinctrl_get_select(
+				struct amlsd_host *host, const char *name)
+{
+	u32 val;
+
+	if (!strcmp("sd_clk_cmd_pins", name)) {
+		val = readl(host->pinmux_base + PIN_MUX_REG9);
+		val &= ~0xFFFFFF;
+		val |= 0x110000;
+		writel(val, host->pinmux_base + PIN_MUX_REG9);
+		/* pullup status */
+		pr_info("name %s -> pinmux 9 0x%x\n", name, val);
+
+	} else if (!strcmp("sd_all_pins", name)) {
+		val = readl(host->pinmux_base + PIN_MUX_REG9);
+		val &= ~0xFFFFFF;
+		val |= 0x111111;
+		writel(val, host->pinmux_base + PIN_MUX_REG9);
+		/* pullup status */
+
+		pr_info("name %s -> pinmux 9 0x%x\n", name, val);
+	} else
+		pr_err("E: name %s do nothing.\n", name);
+
+	return NULL;
+}
+#endif /* SD_EMMC_PIN_CTRL */
 
 void of_amlsd_xfer_pre(struct mmc_host *mmc)
 {
@@ -489,10 +518,15 @@ void of_amlsd_xfer_pre(struct mmc_host *mmc)
 			mutex_lock(&host->pinmux_lock);
 			ppin = aml_devm_pinctrl_get_select(host, pinctrl);
 			mutex_unlock(&host->pinmux_lock);
+			/* bringup on ptm for g12 */
+		#ifndef SD_EMMC_PIN_CTRL
 			if (!IS_ERR(ppin)) {
 				/* pdata->host->pinctrl = ppin; */
 				break;
 			}
+		#else
+			break;
+		#endif
 			/* else -> aml_irq_cdin_thread()
 			 *should be using one of the GPIO of card,
 			 * then we should wait here until the GPIO is free,
diff --git a/include/linux/amlogic/aml_sd_emmc_internal.h b/include/linux/amlogic/aml_sd_emmc_internal.h
index a004227db5c4..9d0d8635549f 100644
--- a/include/linux/amlogic/aml_sd_emmc_internal.h
+++ b/include/linux/amlogic/aml_sd_emmc_internal.h
@@ -40,4 +40,9 @@ extern int aml_sd_emmc_post_dma(struct amlsd_host *host,
 extern u32 aml_sd_emmc_tuning_transfer(struct mmc_host *mmc,
 	u32 opcode, const u8 *blk_pattern, u8 *blk_test, u32 blksz);
 
+void aml_mmc_clk_switch_off(struct amlsd_host *host);
+
+void aml_mmc_clk_switch(struct amlsd_host *host,
+	int clk_div, int clk_src_sel);
+
 #endif
diff --git a/include/linux/amlogic/amlsd.h b/include/linux/amlogic/amlsd.h
index 7d999acbf4b6..14c0ce08c9dc 100644
--- a/include/linux/amlogic/amlsd.h
+++ b/include/linux/amlogic/amlsd.h
@@ -19,6 +19,12 @@
 #define AMLSD_H
 #include <linux/of_gpio.h>
 
+/* ptm or pxp simulation */
+#define CONFIG_MESON_CPU_EMULATOR
+/* hardcode clock, for debug or bringup */
+/* #define SD_EMMC_CLK_CTRL	(1) */
+/* #define SD_EMMC_PIN_CTRL	(1) */
+
 #define AML_MMC_MAJOR_VERSION   3
 #define AML_MMC_MINOR_VERSION   02
 #define AML_MMC_VERSION \
diff --git a/include/linux/amlogic/sd.h b/include/linux/amlogic/sd.h
index 2ffacc58e7a1..d73066e96e73 100644
--- a/include/linux/amlogic/sd.h
+++ b/include/linux/amlogic/sd.h
@@ -170,6 +170,7 @@ enum mmc_chip_e {
 	MMC_CHIP_AXG = 0x25,
 	MMC_CHIP_GXLX = 0x26,
 	MMC_CHIP_TXHD = 0x27,
+	MMC_CHIP_G12A = 0x28,
 };
 
 struct meson_mmc_data {
@@ -1586,30 +1587,30 @@ struct sd_emmc_desc_info {
 	u32 resp_addr;
 };
 #define HHI_NAND_CLK_CNTL					0x97
-#define SD_EMMC_MAX_DESC_MUN					512
-#define SD_EMMC_REQ_DESC_MUN					4
-#define SD_EMMC_CLOCK_SRC_OSC				 0 /* 24MHz */
-#define SD_EMMC_CLOCK_SRC_FCLK_DIV2		   1 /* 1GHz */
-#define SD_EMMC_CLOCK_SRC_400MHZ			4
-#define SD_EMMC_CLOCK_SRC_MPLL				2 /* MPLL */
-#define SD_EMMC_CLOCK_SRC_DIFF_PLL			3
-#define SD_EMMC_IRQ_ALL					0x3fff
-#define SD_EMMC_RESP_SRAM_OFF					0
+#define SD_EMMC_MAX_DESC_MUN		512
+#define SD_EMMC_REQ_DESC_MUN		4
+#define SD_EMMC_CLOCK_SRC_OSC		0 /* 24MHz */
+#define SD_EMMC_CLOCK_SRC_FCLK_DIV2	1 /* 1GHz */
+#define SD_EMMC_CLOCK_SRC_400MHZ	4
+#define SD_EMMC_CLOCK_SRC_MPLL		2 /* MPLL */
+#define SD_EMMC_CLOCK_SRC_DIFF_PLL	3
+#define SD_EMMC_IRQ_ALL			0x3fff
+#define SD_EMMC_RESP_SRAM_OFF		0
 /*#define SD_EMMC_DESC_SET_REG*/
 
-#define SD_EMMC_DESC_REG_CONF					0x4
-#define SD_EMMC_DESC_REG_IRQC					0xC
-#define SD_EMMC_DESC_RESP_STAT				0xfff80000
+#define SD_EMMC_DESC_REG_CONF		0x4
+#define SD_EMMC_DESC_REG_IRQC		0xC
+#define SD_EMMC_DESC_RESP_STAT		0xfff80000
 #define SD_EMMC_IRQ_EN_ALL_INIT
 #define SD_EMMC_REQ_DMA_SGMAP
 /* #define SD_EMMC_CLK_CTRL*/
 /* #define SD_EMMC_DATA_TASKLET */
-#define STAT_POLL_TIMEOUT				0xfffff
-#define STAT_POLL_TIMEOUT				0xfffff
+#define STAT_POLL_TIMEOUT			0xfffff
+#define STAT_POLL_TIMEOUT			0xfffff
 
-#define MMC_RSP_136_NUM					4
-#define MMC_MAX_DEVICE					3
-#define MMC_TIMEOUT						5000
+#define MMC_RSP_136_NUM				4
+#define MMC_MAX_DEVICE				3
+#define MMC_TIMEOUT				5000
 
 /* #define pr_info(a...) */
 #define DBG_LINE_INFO() \
@@ -1618,15 +1619,26 @@ struct sd_emmc_desc_info {
 }
 /* #define DBG_LINE_INFO() */
 /* #define dev_err(a,s) pr_info(KERN_INFO s); */
+/* fixme, those code should not be marco as vairous on chips */
+/* reg0 for BOOT */
+#define BOOT_POLL_UP	(0x3A << 2)
+#define BOOT_POLL_UP_EN (0x48 << 2)
+/* reg1 for GPIOC(card) */
+#define CARD_POLL_UP	(0x3B << 2)
+#define CARD_POLL_UP_EN (0x49 << 2)
+
+/* pinmux for sdcards, gpioC */
+#define PIN_MUX_REG6	(0xb6 << 2)
+#define PIN_MUX_REG9	(0xb9 << 2)
 
 #define AML_MMC_DISABLED_TIMEOUT	100
 #define AML_MMC_SLEEP_TIMEOUT		1000
-#define AML_MMC_OFF_TIMEOUT 8000
+#define AML_MMC_OFF_TIMEOUT		8000
 
 #define SD_EMMC_BOUNCE_REQ_SIZE		(512*1024)
 #define SDHC_BOUNCE_REQ_SIZE		(512*1024)
 #define SDIO_BOUNCE_REQ_SIZE		(128*1024)
-#define MMC_TIMEOUT_MS		20
+#define MMC_TIMEOUT_MS			(20)
 
 #define MESON_SDIO_PORT_A 0
 #define MESON_SDIO_PORT_B 1
@@ -1641,12 +1653,12 @@ extern void amlsd_init_debugfs(struct mmc_host *host);
 
 extern struct mmc_host *sdio_host;
 
-#define	 SPI_BOOT_FLAG				   0
-#define	 NAND_BOOT_FLAG				  1
-#define	 EMMC_BOOT_FLAG				  2
-#define	 CARD_BOOT_FLAG				  3
-#define	 SPI_NAND_FLAG				   4
-#define	 SPI_EMMC_FLAG				   5
+#define	 SPI_BOOT_FLAG			0
+#define	 NAND_BOOT_FLAG			1
+#define	 EMMC_BOOT_FLAG			2
+#define	 CARD_BOOT_FLAG			3
+#define	 SPI_NAND_FLAG			4
+#define	 SPI_EMMC_FLAG			5
 
 #define R_BOOT_DEVICE_FLAG  (aml_read_cbus(ASSIST_POR_CONFIG))