[PATCH 0/2] mmc: sdhci: Defer probe if regulators are not registered

[PATCH 0/2] mmc: sdhci: Defer probe if regulators are not registered

[Pavan Kunapuli]

Regulator driver registration may sometimes be done after
mmc driver registration. In such cases, defer mmc probe
to obtain vmmc and vmmcq regulators.
Added vmmc and vmmcq supplies to tegra dt files.

Pavan Kunapuli (2):
  ARM: dt: tegra: Add sdhci regulators
  mmc: sdhci: Defer probe if regulator_get fails

 arch/arm/boot/dts/tegra20-harmony.dts    |   27 ++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-paz00.dts      |   24 +++++++++++++++++++-
 arch/arm/boot/dts/tegra20-seaboard.dts   |   35 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-tamonten.dtsi  |   10 ++++++++
 arch/arm/boot/dts/tegra20-ventana.dts    |   36 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-whistler.dts   |    9 +++++-
 arch/arm/boot/dts/tegra30-cardhu-a02.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu-a04.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu.dtsi    |   19 ++++++++++++++-
 drivers/mmc/host/sdhci.c                 |   25 ++++++++++++++++++--
 10 files changed, 176 insertions(+), 13 deletions(-)

[PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Pavan Kunapuli]

Adding vmmc and vmmcq supplies for sdhci nodes
in tegra dt files.

Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
---
 arch/arm/boot/dts/tegra20-harmony.dts    |   27 ++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-paz00.dts      |   24 +++++++++++++++++++-
 arch/arm/boot/dts/tegra20-seaboard.dts   |   35 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-tamonten.dtsi  |   10 ++++++++
 arch/arm/boot/dts/tegra20-ventana.dts    |   36 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-whistler.dts   |    9 +++++-
 arch/arm/boot/dts/tegra30-cardhu-a02.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu-a04.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu.dtsi    |   19 ++++++++++++++-
 9 files changed, 154 insertions(+), 10 deletions(-)

diff --git a/arch/arm/boot/dts/tegra20-harmony.dts b/arch/arm/boot/dts/tegra20-harmony.dts
index 74b8a47..5b02afe 100644
--- a/arch/arm/boot/dts/tegra20-harmony.dts
+++ b/arch/arm/boot/dts/tegra20-harmony.dts
@@ -419,7 +419,8 @@
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
-		power-gpios = <&gpio 155 0>; /* gpio PT3 */
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 		bus-width = <4>;
 	};
 
@@ -427,7 +428,8 @@
 		status = "okay";
 		cd-gpios = <&gpio 58 0>; /* gpio PH2 */
 		wp-gpios = <&gpio 59 0>; /* gpio PH3 */
-		power-gpios = <&gpio 70 0>; /* gpio PI6 */
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 		bus-width = <8>;
 	};
 
@@ -495,6 +497,27 @@
 			gpio = <&gpio 176 0>; /* gpio PW0 */
 			enable-active-high;
 		};
+
+		vddio_sdmmc_reg: regulator@6 {
+			compatible = "regulator-fixed";
+			reg = <6>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 70 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sd_reg: regulator@7 {
+			compatible = "regulator-fixed";
+			reg = <7>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 155 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-paz00.dts b/arch/arm/boot/dts/tegra20-paz00.dts
index 6a93d14..e161b65 100644
--- a/arch/arm/boot/dts/tegra20-paz00.dts
+++ b/arch/arm/boot/dts/tegra20-paz00.dts
@@ -422,13 +422,17 @@
 		status = "okay";
 		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
 		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
-		power-gpios = <&gpio 169 0>; /* gpio PV1 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
+
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	gpio-keys {
@@ -465,6 +469,24 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-always-on;
 		};
+
+		vddio_sd_reg: regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			enable-active-high;
+			gpio = <&gpio 169 0>; /* gpio PV1 */
+		};
+
+		vddio_sdmmc_reg: regulator@2 {
+			compatible = "regulator-fixed";
+			reg = <2>;
+			regulator-name  = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-seaboard.dts b/arch/arm/boot/dts/tegra20-seaboard.dts
index eafeca6..1b7d692 100644
--- a/arch/arm/boot/dts/tegra20-seaboard.dts
+++ b/arch/arm/boot/dts/tegra20-seaboard.dts
@@ -450,7 +450,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "vdd_ldo5,vcore_mmc";
 					regulator-min-microvolt = <2850000>;
 					regulator-max-microvolt = <2850000>;
@@ -565,6 +565,9 @@
 		status = "okay";
 		power-gpios = <&gpio 86 0>; /* gpio PK6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
+
 	};
 
 	sdhci@c8000400 {
@@ -573,11 +576,15 @@
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
 		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&vddio_nand_reg>;
 	};
 
 	gpio-keys {
@@ -632,6 +639,32 @@
 			gpio = <&pmic 1 0>;
 			enable-active-high;
 		};
+
+		vddio_sd_reg: regulator@3 {
+			compatible = "regulator-fixed";
+			reg = <3>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 176 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sdmmc_reg: regulator@4 {
+			compatible = "regulator-fixed";
+			reg = <4>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+
+		vddio_nand_reg: regulator@5 {
+			compatible = "regulator-fixed";
+			reg = <5>;
+			regulator-name = "vddio_nand";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-tamonten.dtsi b/arch/arm/boot/dts/tegra20-tamonten.dtsi
index 5b3d8b1..a60e828 100644
--- a/arch/arm/boot/dts/tegra20-tamonten.dtsi
+++ b/arch/arm/boot/dts/tegra20-tamonten.dtsi
@@ -396,6 +396,8 @@
 		wp-gpios = <&gpio 59 0>; /* gpio PH3 */
 		bus-width = <4>;
 		status = "okay";
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	regulators {
@@ -412,5 +414,13 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-always-on;
 		};
+
+		vddio_sdmmc_reg: regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
 	};
 };
diff --git a/arch/arm/boot/dts/tegra20-ventana.dts b/arch/arm/boot/dts/tegra20-ventana.dts
index bec8bb2..0210670 100644
--- a/arch/arm/boot/dts/tegra20-ventana.dts
+++ b/arch/arm/boot/dts/tegra20-ventana.dts
@@ -376,7 +376,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "vdd_ldo5,vcore_mmc";
 					regulator-min-microvolt = <2850000>;
 					regulator-max-microvolt = <2850000>;
@@ -439,19 +439,24 @@
 		status = "okay";
 		power-gpios = <&gpio 86 0>; /* gpio PK6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	sdhci@c8000400 {
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
-		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&vddio_nand_reg>;
 	};
 
 	regulators {
@@ -506,6 +511,33 @@
 			gpio = <&gpio 176 0>; /* gpio PW0 */
 			enable-active-high;
 		};
+
+		vddio_sd_reg: regulator@5 {
+			compatible = "regulator-fixed";
+			reg = <5>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 70 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sdmmc_reg: regulator@6 {
+			compatible = "regulator-fixed";
+			reg = <6>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+
+		vddio_nand_reg: regulator@7 {
+			compatible = "regulator-fixed";
+			reg = <7>;
+			regulator-name = "vddio_nand";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
+
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-whistler.dts b/arch/arm/boot/dts/tegra20-whistler.dts
index 94a71c9..bdc4918 100644
--- a/arch/arm/boot/dts/tegra20-whistler.dts
+++ b/arch/arm/boot/dts/tegra20-whistler.dts
@@ -349,7 +349,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "nvvdd_ldo5,vcore_mmc,avdd_lcd1,vddio_1wire";
 					regulator-min-microvolt = <2800000>;
 					regulator-max-microvolt = <2800000>;
@@ -394,7 +394,7 @@
 					regulator-max-microvolt = <3300000>;
 				};
 
-				ldo12 {
+				ldo12_reg: ldo12 {
 					regulator-name = "nvvdd_ldo12,vddio_sdio";
 					regulator-min-microvolt = <2800000>;
 					regulator-max-microvolt = <2800000>;
@@ -496,11 +496,16 @@
 		status = "okay";
 		wp-gpios = <&gpio 173 0>; /* gpio PV5 */
 		bus-width = <8>;
+		vmmc-supply = <&ldo12_reg>;
+		vqmmc-supply = <&ldo12_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&ldo5_reg>;
+
 	};
 
 	regulators {
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a02.dts b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
index adc88aa..697effa 100644
--- a/arch/arm/boot/dts/tegra30-cardhu-a02.dts
+++ b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
@@ -88,6 +88,8 @@
 		status = "okay";
 		power-gpios = <&gpio 28 0>; /* gpio PD4 */
 		bus-width = <4>;
+		vmmc-supply = <&vio_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 };
 
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a04.dts b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
index 08163e1..ee4820a 100644
--- a/arch/arm/boot/dts/tegra30-cardhu-a04.dts
+++ b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
@@ -100,5 +100,7 @@
 		status = "okay";
 		power-gpios = <&gpio 27 0>; /* gpio PD3 */
 		bus-width = <4>;
+		vmmc-supply = <&vio_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 };
diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index b245e6c..fbf0fae 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
@@ -247,7 +247,7 @@
 
 				ldo5_reg: ldo5 {
 					regulator-name = "vddio_sdmmc,avdd_vdac";
-					regulator-min-microvolt = <3300000>;
+					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <3300000>;
 					regulator-always-on;
 				};
@@ -290,13 +290,16 @@
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 155 0>; /* gpio PT3 */
-		power-gpios = <&gpio 31 0>; /* gpio PD7 */
 		bus-width = <4>;
+		vmmc-supply = <&sdcard_3v3_reg>;
+		vqmmc-supply = <&ldo5_reg>;
 	};
 
 	sdhci@78000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&emmc_3v3_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 
 	regulators {
@@ -451,6 +454,18 @@
 			gpio-open-drain;
 			vin-supply = <&vdd_5v0_reg>;
 		};
+
+		sdcard_3v3_reg: regulator@13 {
+			compatible = "regulator-fixed";
+			reg = <13>;
+			regulator-name = "sdcard_3v3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			enable-active-high;
+			gpio = <&gpio 31 0>; /* GPIO PD7 */
+			vin-supply = <&sys_3v3_reg>;
+		};
+
 	};
 
 	sound {
-- 
1.7.1.1

[PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

[Pavan Kunapuli]

vmmc and vqmmc regulators control the voltage to
the host and device. Defer the probe if either of
them is not registered.

Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
---
 drivers/mmc/host/sdhci.c |   25 ++++++++++++++++++++++---
 1 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 7922adb..925c403 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2844,11 +2844,17 @@ int sdhci_add_host(struct sdhci_host *host)
 	    !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
 		mmc->caps |= MMC_CAP_NEEDS_POLL;
 
-	/* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
+	/*
+	 * If vqmmc regulator and no 1.8V signalling, then there's no UHS.
+	 * vqmmc regulator should be present. If it's not present,
+	 * assume the regulator driver registration is not yet done and
+	 * defer the probe.
+	 */
 	host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc");
 	if (IS_ERR(host->vqmmc)) {
-		pr_info("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
+		pr_err("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
 		host->vqmmc = NULL;
+		return -EPROBE_DEFER;
 	}
 	else if (regulator_is_supported_voltage(host->vqmmc, 1800000, 1800000))
 		regulator_enable(host->vqmmc);
@@ -2903,10 +2909,17 @@ int sdhci_add_host(struct sdhci_host *host)
 
 	ocr_avail = 0;
 
+	/*
+	 * vmmc regulator should be present. If it's not present,
+	 * assume the regulator driver registration is not yet done
+	 * and defer the probe.
+	 */
 	host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
 	if (IS_ERR(host->vmmc)) {
-		pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
+		pr_err("%s: no vmmc regulator found\n", mmc_hostname(mmc));
 		host->vmmc = NULL;
+		ret = -EPROBE_DEFER;
+		goto vmmc_err;
 	} else
 		regulator_enable(host->vmmc);
 
@@ -3121,7 +3134,13 @@ reset:
 untasklet:
 	tasklet_kill(&host->card_tasklet);
 	tasklet_kill(&host->finish_tasklet);
+vmmc_err:
+	if (host->vqmmc) {
+		if (regulator_is_enabled(host->vqmmc))
+			regulator_disable(host->vqmmc);
 
+		regulator_put(host->vqmmc);
+	}
 	return ret;
 }
 
-- 
1.7.1.1

[PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Pavan Kunapuli]

Adding vmmc and vmmcq supplies for sdhci nodes
in tegra dt files.

Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
---
 arch/arm/boot/dts/tegra20-harmony.dts    |   27 ++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-paz00.dts      |   24 +++++++++++++++++++-
 arch/arm/boot/dts/tegra20-seaboard.dts   |   35 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-tamonten.dtsi  |   10 ++++++++
 arch/arm/boot/dts/tegra20-ventana.dts    |   36 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/tegra20-whistler.dts   |    9 +++++-
 arch/arm/boot/dts/tegra30-cardhu-a02.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu-a04.dts |    2 +
 arch/arm/boot/dts/tegra30-cardhu.dtsi    |   19 ++++++++++++++-
 9 files changed, 154 insertions(+), 10 deletions(-)

diff --git a/arch/arm/boot/dts/tegra20-harmony.dts b/arch/arm/boot/dts/tegra20-harmony.dts
index 74b8a47..5b02afe 100644
--- a/arch/arm/boot/dts/tegra20-harmony.dts
+++ b/arch/arm/boot/dts/tegra20-harmony.dts
@@ -419,7 +419,8 @@
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
-		power-gpios = <&gpio 155 0>; /* gpio PT3 */
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 		bus-width = <4>;
 	};
 
@@ -427,7 +428,8 @@
 		status = "okay";
 		cd-gpios = <&gpio 58 0>; /* gpio PH2 */
 		wp-gpios = <&gpio 59 0>; /* gpio PH3 */
-		power-gpios = <&gpio 70 0>; /* gpio PI6 */
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 		bus-width = <8>;
 	};
 
@@ -495,6 +497,27 @@
 			gpio = <&gpio 176 0>; /* gpio PW0 */
 			enable-active-high;
 		};
+
+		vddio_sdmmc_reg: regulator@6 {
+			compatible = "regulator-fixed";
+			reg = <6>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 70 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sd_reg: regulator@7 {
+			compatible = "regulator-fixed";
+			reg = <7>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 155 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-paz00.dts b/arch/arm/boot/dts/tegra20-paz00.dts
index 6a93d14..e161b65 100644
--- a/arch/arm/boot/dts/tegra20-paz00.dts
+++ b/arch/arm/boot/dts/tegra20-paz00.dts
@@ -422,13 +422,17 @@
 		status = "okay";
 		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
 		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
-		power-gpios = <&gpio 169 0>; /* gpio PV1 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
+
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	gpio-keys {
@@ -465,6 +469,24 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-always-on;
 		};
+
+		vddio_sd_reg: regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			enable-active-high;
+			gpio = <&gpio 169 0>; /* gpio PV1 */
+		};
+
+		vddio_sdmmc_reg: regulator@2 {
+			compatible = "regulator-fixed";
+			reg = <2>;
+			regulator-name  = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-seaboard.dts b/arch/arm/boot/dts/tegra20-seaboard.dts
index eafeca6..1b7d692 100644
--- a/arch/arm/boot/dts/tegra20-seaboard.dts
+++ b/arch/arm/boot/dts/tegra20-seaboard.dts
@@ -450,7 +450,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "vdd_ldo5,vcore_mmc";
 					regulator-min-microvolt = <2850000>;
 					regulator-max-microvolt = <2850000>;
@@ -565,6 +565,9 @@
 		status = "okay";
 		power-gpios = <&gpio 86 0>; /* gpio PK6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
+
 	};
 
 	sdhci@c8000400 {
@@ -573,11 +576,15 @@
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
 		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&vddio_nand_reg>;
 	};
 
 	gpio-keys {
@@ -632,6 +639,32 @@
 			gpio = <&pmic 1 0>;
 			enable-active-high;
 		};
+
+		vddio_sd_reg: regulator@3 {
+			compatible = "regulator-fixed";
+			reg = <3>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 176 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sdmmc_reg: regulator@4 {
+			compatible = "regulator-fixed";
+			reg = <4>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+
+		vddio_nand_reg: regulator@5 {
+			compatible = "regulator-fixed";
+			reg = <5>;
+			regulator-name = "vddio_nand";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-tamonten.dtsi b/arch/arm/boot/dts/tegra20-tamonten.dtsi
index 5b3d8b1..a60e828 100644
--- a/arch/arm/boot/dts/tegra20-tamonten.dtsi
+++ b/arch/arm/boot/dts/tegra20-tamonten.dtsi
@@ -396,6 +396,8 @@
 		wp-gpios = <&gpio 59 0>; /* gpio PH3 */
 		bus-width = <4>;
 		status = "okay";
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	regulators {
@@ -412,5 +414,13 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-always-on;
 		};
+
+		vddio_sdmmc_reg: regulator@1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
 	};
 };
diff --git a/arch/arm/boot/dts/tegra20-ventana.dts b/arch/arm/boot/dts/tegra20-ventana.dts
index bec8bb2..0210670 100644
--- a/arch/arm/boot/dts/tegra20-ventana.dts
+++ b/arch/arm/boot/dts/tegra20-ventana.dts
@@ -376,7 +376,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "vdd_ldo5,vcore_mmc";
 					regulator-min-microvolt = <2850000>;
 					regulator-max-microvolt = <2850000>;
@@ -439,19 +439,24 @@
 		status = "okay";
 		power-gpios = <&gpio 86 0>; /* gpio PK6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;
 	};
 
 	sdhci@c8000400 {
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 57 0>; /* gpio PH1 */
-		power-gpios = <&gpio 70 0>; /* gpio PI6 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&vddio_nand_reg>;
 	};
 
 	regulators {
@@ -506,6 +511,33 @@
 			gpio = <&gpio 176 0>; /* gpio PW0 */
 			enable-active-high;
 		};
+
+		vddio_sd_reg: regulator@5 {
+			compatible = "regulator-fixed";
+			reg = <5>;
+			regulator-name = "vddio_sd";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio 70 0>; /* gpio PW0 */
+			enable-active-high;
+		};
+
+		vddio_sdmmc_reg: regulator@6 {
+			compatible = "regulator-fixed";
+			reg = <6>;
+			regulator-name = "vddio_sdmmc";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+
+		vddio_nand_reg: regulator@7 {
+			compatible = "regulator-fixed";
+			reg = <7>;
+			regulator-name = "vddio_nand";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
+
 	};
 
 	sound {
diff --git a/arch/arm/boot/dts/tegra20-whistler.dts b/arch/arm/boot/dts/tegra20-whistler.dts
index 94a71c9..bdc4918 100644
--- a/arch/arm/boot/dts/tegra20-whistler.dts
+++ b/arch/arm/boot/dts/tegra20-whistler.dts
@@ -349,7 +349,7 @@
 					regulator-always-on;
 				};
 
-				ldo5 {
+				ldo5_reg: ldo5 {
 					regulator-name = "nvvdd_ldo5,vcore_mmc,avdd_lcd1,vddio_1wire";
 					regulator-min-microvolt = <2800000>;
 					regulator-max-microvolt = <2800000>;
@@ -394,7 +394,7 @@
 					regulator-max-microvolt = <3300000>;
 				};
 
-				ldo12 {
+				ldo12_reg: ldo12 {
 					regulator-name = "nvvdd_ldo12,vddio_sdio";
 					regulator-min-microvolt = <2800000>;
 					regulator-max-microvolt = <2800000>;
@@ -496,11 +496,16 @@
 		status = "okay";
 		wp-gpios = <&gpio 173 0>; /* gpio PV5 */
 		bus-width = <8>;
+		vmmc-supply = <&ldo12_reg>;
+		vqmmc-supply = <&ldo12_reg>;
 	};
 
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&ldo5_reg>;
+		vqmmc-supply = <&ldo5_reg>;
+
 	};
 
 	regulators {
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a02.dts b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
index adc88aa..697effa 100644
--- a/arch/arm/boot/dts/tegra30-cardhu-a02.dts
+++ b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
@@ -88,6 +88,8 @@
 		status = "okay";
 		power-gpios = <&gpio 28 0>; /* gpio PD4 */
 		bus-width = <4>;
+		vmmc-supply = <&vio_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 };
 
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a04.dts b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
index 08163e1..ee4820a 100644
--- a/arch/arm/boot/dts/tegra30-cardhu-a04.dts
+++ b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
@@ -100,5 +100,7 @@
 		status = "okay";
 		power-gpios = <&gpio 27 0>; /* gpio PD3 */
 		bus-width = <4>;
+		vmmc-supply = <&vio_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 };
diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index b245e6c..fbf0fae 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
@@ -247,7 +247,7 @@
 
 				ldo5_reg: ldo5 {
 					regulator-name = "vddio_sdmmc,avdd_vdac";
-					regulator-min-microvolt = <3300000>;
+					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <3300000>;
 					regulator-always-on;
 				};
@@ -290,13 +290,16 @@
 		status = "okay";
 		cd-gpios = <&gpio 69 0>; /* gpio PI5 */
 		wp-gpios = <&gpio 155 0>; /* gpio PT3 */
-		power-gpios = <&gpio 31 0>; /* gpio PD7 */
 		bus-width = <4>;
+		vmmc-supply = <&sdcard_3v3_reg>;
+		vqmmc-supply = <&ldo5_reg>;
 	};
 
 	sdhci@78000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&emmc_3v3_reg>;
+		vqmmc-supply = <&vio_reg>;
 	};
 
 	regulators {
@@ -451,6 +454,18 @@
 			gpio-open-drain;
 			vin-supply = <&vdd_5v0_reg>;
 		};
+
+		sdcard_3v3_reg: regulator@13 {
+			compatible = "regulator-fixed";
+			reg = <13>;
+			regulator-name = "sdcard_3v3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			enable-active-high;
+			gpio = <&gpio 31 0>; /* GPIO PD7 */
+			vin-supply = <&sys_3v3_reg>;
+		};
+
 	};
 
 	sound {
-- 
1.7.1.1

Re: [PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

[Jaehoon Chung]

I didn't understand why defer the probe?
I think that some board can't control vqmmc or vmmc.

Best Regards,
Jaehoon Chung
On 10/23/2012 04:18 PM, Pavan Kunapuli wrote:
> vmmc and vqmmc regulators control the voltage to
> the host and device. Defer the probe if either of
> them is not registered.
> 
> Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
> ---
>  drivers/mmc/host/sdhci.c |   25 ++++++++++++++++++++++---
>  1 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 7922adb..925c403 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2844,11 +2844,17 @@ int sdhci_add_host(struct sdhci_host *host)
>  	    !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
>  		mmc->caps |= MMC_CAP_NEEDS_POLL;
>  
> -	/* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
> +	/*
> +	 * If vqmmc regulator and no 1.8V signalling, then there's no UHS.
> +	 * vqmmc regulator should be present. If it's not present,
> +	 * assume the regulator driver registration is not yet done and
> +	 * defer the probe.
> +	 */
>  	host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc");
>  	if (IS_ERR(host->vqmmc)) {
> -		pr_info("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
> +		pr_err("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
>  		host->vqmmc = NULL;
> +		return -EPROBE_DEFER;
>  	}
>  	else if (regulator_is_supported_voltage(host->vqmmc, 1800000, 1800000))
>  		regulator_enable(host->vqmmc);
> @@ -2903,10 +2909,17 @@ int sdhci_add_host(struct sdhci_host *host)
>  
>  	ocr_avail = 0;
>  
> +	/*
> +	 * vmmc regulator should be present. If it's not present,
> +	 * assume the regulator driver registration is not yet done
> +	 * and defer the probe.
> +	 */
>  	host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
>  	if (IS_ERR(host->vmmc)) {
> -		pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
> +		pr_err("%s: no vmmc regulator found\n", mmc_hostname(mmc));
>  		host->vmmc = NULL;
> +		ret = -EPROBE_DEFER;
> +		goto vmmc_err;
>  	} else
>  		regulator_enable(host->vmmc);
>  
> @@ -3121,7 +3134,13 @@ reset:
>  untasklet:
>  	tasklet_kill(&host->card_tasklet);
>  	tasklet_kill(&host->finish_tasklet);
> +vmmc_err:
> +	if (host->vqmmc) {
> +		if (regulator_is_enabled(host->vqmmc))
> +			regulator_disable(host->vqmmc);
>  
> +		regulator_put(host->vqmmc);
> +	}
>  	return ret;
>  }
>  
> 

RE: [PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

[Pavan Kunapuli]

For platforms where the board can control vmmc or vqmmc, if the regulator supplies registration is not done before sdhci probe, deferring sdhci probe would ensure that the regulators are available the next time around. For platforms where the board can't control vmmc or vqmmc, we can have a dummy regulator to make sure probe will never get deferred.

-----Original Message-----
From: Jaehoon Chung [mailto:jh80.chung@samsung.com] 
Sent: 23 October 2012 15:41
To: Pavan Kunapuli
Cc: swarren@wwwdotorg.org; linux@arm.linux.org.uk; cjb@laptop.org; linux-kernel@vger.kernel.org; linux-mmc@vger.kernel.org
Subject: Re: [PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

I didn't understand why defer the probe?
I think that some board can't control vqmmc or vmmc.

Best Regards,
Jaehoon Chung
On 10/23/2012 04:18 PM, Pavan Kunapuli wrote:
> vmmc and vqmmc regulators control the voltage to the host and device. 
> Defer the probe if either of them is not registered.
> 
> Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
> ---
>  drivers/mmc/host/sdhci.c |   25 ++++++++++++++++++++++---
>  1 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 
> 7922adb..925c403 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2844,11 +2844,17 @@ int sdhci_add_host(struct sdhci_host *host)
>  	    !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
>  		mmc->caps |= MMC_CAP_NEEDS_POLL;
>  
> -	/* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
> +	/*
> +	 * If vqmmc regulator and no 1.8V signalling, then there's no UHS.
> +	 * vqmmc regulator should be present. If it's not present,
> +	 * assume the regulator driver registration is not yet done and
> +	 * defer the probe.
> +	 */
>  	host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc");
>  	if (IS_ERR(host->vqmmc)) {
> -		pr_info("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
> +		pr_err("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
>  		host->vqmmc = NULL;
> +		return -EPROBE_DEFER;
>  	}
>  	else if (regulator_is_supported_voltage(host->vqmmc, 1800000, 1800000))
>  		regulator_enable(host->vqmmc);
> @@ -2903,10 +2909,17 @@ int sdhci_add_host(struct sdhci_host *host)
>  
>  	ocr_avail = 0;
>  
> +	/*
> +	 * vmmc regulator should be present. If it's not present,
> +	 * assume the regulator driver registration is not yet done
> +	 * and defer the probe.
> +	 */
>  	host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
>  	if (IS_ERR(host->vmmc)) {
> -		pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
> +		pr_err("%s: no vmmc regulator found\n", mmc_hostname(mmc));
>  		host->vmmc = NULL;
> +		ret = -EPROBE_DEFER;
> +		goto vmmc_err;
>  	} else
>  		regulator_enable(host->vmmc);
>  
> @@ -3121,7 +3134,13 @@ reset:
>  untasklet:
>  	tasklet_kill(&host->card_tasklet);
>  	tasklet_kill(&host->finish_tasklet);
> +vmmc_err:
> +	if (host->vqmmc) {
> +		if (regulator_is_enabled(host->vqmmc))
> +			regulator_disable(host->vqmmc);
>  
> +		regulator_put(host->vqmmc);
> +	}
>  	return ret;
>  }
>  
> 

Re: [PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Stephen Warren]

On 10/23/2012 01:18 AM, Pavan Kunapuli wrote:
> Adding vmmc and vmmcq supplies for sdhci nodes
> in tegra dt files.

As I already mentioned downstream, this patch is invalid because it will
cause runtime failures if applied before the second patch in this
series. Please see the more detailed explanation I sent downstream.

Re: [PATCH 2/2] mmc: sdhci: Defer probe if regulator_get fails

[Stephen Warren]

On 10/23/2012 01:18 AM, Pavan Kunapuli wrote:
> vmmc and vqmmc regulators control the voltage to
> the host and device. Defer the probe if either of
> them is not registered.
> 
> Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
> ---
>  drivers/mmc/host/sdhci.c |   25 ++++++++++++++++++++++---
>  1 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 7922adb..925c403 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2844,11 +2844,17 @@ int sdhci_add_host(struct sdhci_host *host)
>  	    !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
>  		mmc->caps |= MMC_CAP_NEEDS_POLL;
>  
> -	/* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
> +	/*
> +	 * If vqmmc regulator and no 1.8V signalling, then there's no UHS.
> +	 * vqmmc regulator should be present. If it's not present,
> +	 * assume the regulator driver registration is not yet done and
> +	 * defer the probe.
> +	 */
>  	host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc");
>  	if (IS_ERR(host->vqmmc)) {
> -		pr_info("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
> +		pr_err("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
>  		host->vqmmc = NULL;
> +		return -EPROBE_DEFER;
>  	}

Right now, the regulator is optional, and any failure to acquire the
regulator is just ignored.

Instead, I think the behaviour we want is:

Attempt to get regulator.
1) If no error -> OK
2) If deferred probe error -> return -EPROBE_DEFER
3) If any other error -> ignore it

Assuming that regulator_get() can explicitly detect and return the
difference between cases (1) and (2) above. If it can't, it seems like
it should be able to.

Re: [PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Marc Dietrich]

Pavan,

On Tuesday 23 October 2012 12:48:59 Pavan Kunapuli wrote:
> Adding vmmc and vmmcq supplies for sdhci nodes
> in tegra dt files.

<...>

> diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
> b/arch/arm/boot/dts/tegra20-paz00.dts index 6a93d14..e161b65 100644
> --- a/arch/arm/boot/dts/tegra20-paz00.dts
> +++ b/arch/arm/boot/dts/tegra20-paz00.dts
> @@ -422,13 +422,17 @@
>  		status = "okay";
>  		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
>  		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
> -		power-gpios = <&gpio 169 0>; /* gpio PV1 */
>  		bus-width = <4>;
> +		vmmc-supply = <&vddio_sd_reg>;
> +		vqmmc-supply = <&vddio_sd_reg>;
>  	};
> 
>  	sdhci@c8000600 {
>  		status = "okay";
>  		bus-width = <8>;
> +		vmmc-supply = <&vddio_sdmmc_reg>;
> +		vqmmc-supply = <&vddio_sdmmc_reg>;

to make it better, this should be:

vmmc-supply = <&vcore_mmc_reg>; and
vqmmc-supply = <&vddio_nand_reg>;

with vcore_mmc_reg is ldo5 and vddio_nand_reg is the fixed regulator below.

By doing so, I get "sdhci-tegra sdhci-tegra.3: could not set regulator OCR 
(-1)". MMC subsys wants to set ldo5 to 3.3V but it is fixed. I guess that's 
harmless for now. 

>  	};
> 
>  	gpio-keys {
> @@ -465,6 +469,24 @@
>  			regulator-max-microvolt = <5000000>;
>  			regulator-always-on;
>  		};
> +
> +		vddio_sd_reg: regulator@1 {
> +			compatible = "regulator-fixed";
> +			reg = <1>;
> +			regulator-name = "vddio_sd";
> +			regulator-min-microvolt = <3300000>;
> +			regulator-max-microvolt = <3300000>;
> +			enable-active-high;
> +			gpio = <&gpio 169 0>; /* gpio PV1 */
> +		};
> +
> +		vddio_sdmmc_reg: regulator@2 {

       ^^ vddio_nand_reg acording to schematics

> +			compatible = "regulator-fixed";
> +			reg = <2>;
> +			regulator-name  = "vddio_sdmmc";

also here

> +			regulator-min-microvolt = <3300000>;
> +			regulator-max-microvolt = <3300000>;
> +		};
>  	};
> 
>  	sound {

Re: [PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Stephen Warren]

On 10/23/2012 12:07 PM, Marc Dietrich wrote:
> Pavan,
> 
> On Tuesday 23 October 2012 12:48:59 Pavan Kunapuli wrote:
>> Adding vmmc and vmmcq supplies for sdhci nodes
>> in tegra dt files.
> 
> <...>
> 
>> diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
>> b/arch/arm/boot/dts/tegra20-paz00.dts index 6a93d14..e161b65 100644
>> --- a/arch/arm/boot/dts/tegra20-paz00.dts
>> +++ b/arch/arm/boot/dts/tegra20-paz00.dts
>> @@ -422,13 +422,17 @@
>>  		status = "okay";
>>  		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
>>  		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
>> -		power-gpios = <&gpio 169 0>; /* gpio PV1 */
>>  		bus-width = <4>;
>> +		vmmc-supply = <&vddio_sd_reg>;
>> +		vqmmc-supply = <&vddio_sd_reg>;
>>  	};
>>
>>  	sdhci@c8000600 {
>>  		status = "okay";
>>  		bus-width = <8>;
>> +		vmmc-supply = <&vddio_sdmmc_reg>;
>> +		vqmmc-supply = <&vddio_sdmmc_reg>;
> 
> to make it better, this should be:
> 
> vmmc-supply = <&vcore_mmc_reg>; and
> vqmmc-supply = <&vddio_nand_reg>;
> 
> with vcore_mmc_reg is ldo5 and vddio_nand_reg is the fixed regulator below.

I think for the eMMC (not SD card), the core supply is actually +3vs_s3,
and hence fixed; it looks like LDO5 used to be used, but they changed
it. See the note for the VCC connections on the eMMC chip.

> By doing so, I get "sdhci-tegra sdhci-tegra.3: could not set regulator OCR 
> (-1)". MMC subsys wants to set ldo5 to 3.3V but it is fixed. I guess that's 
> harmless for now. 

What I mention above might end up fixing that?

Re: [PATCH 1/2] ARM: dt: tegra: Add sdhci regulators

[Marc Dietrich]

On Tuesday 23 October 2012 12:42:11 Stephen Warren wrote:
> On 10/23/2012 12:07 PM, Marc Dietrich wrote:
> > Pavan,
> > 
> > On Tuesday 23 October 2012 12:48:59 Pavan Kunapuli wrote:
> >> Adding vmmc and vmmcq supplies for sdhci nodes
> >> in tegra dt files.
> > 
> > <...>
> > 
> >> diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
> >> b/arch/arm/boot/dts/tegra20-paz00.dts index 6a93d14..e161b65 100644
> >> --- a/arch/arm/boot/dts/tegra20-paz00.dts
> >> +++ b/arch/arm/boot/dts/tegra20-paz00.dts
> >> @@ -422,13 +422,17 @@
> >> 
> >>  		status = "okay";
> >>  		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
> >>  		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
> >> 
> >> -		power-gpios = <&gpio 169 0>; /* gpio PV1 */
> >> 
> >>  		bus-width = <4>;
> >> 
> >> +		vmmc-supply = <&vddio_sd_reg>;
> >> +		vqmmc-supply = <&vddio_sd_reg>;
> >> 
> >>  	};
> >>  	
> >>  	sdhci@c8000600 {
> >>  	
> >>  		status = "okay";
> >>  		bus-width = <8>;
> >> 
> >> +		vmmc-supply = <&vddio_sdmmc_reg>;
> >> +		vqmmc-supply = <&vddio_sdmmc_reg>;
> > 
> > to make it better, this should be:
> > 
> > vmmc-supply = <&vcore_mmc_reg>; and
> > vqmmc-supply = <&vddio_nand_reg>;
> > 
> > with vcore_mmc_reg is ldo5 and vddio_nand_reg is the fixed regulator
> > below.
> 
> I think for the eMMC (not SD card), the core supply is actually +3vs_s3,
> and hence fixed; it looks like LDO5 used to be used, but they changed
> it. See the note for the VCC connections on the eMMC chip.

yes, you are right. The schematic had a comment that this was changed.

> > By doing so, I get "sdhci-tegra sdhci-tegra.3: could not set regulator OCR
> > (-1)". MMC subsys wants to set ldo5 to 3.3V but it is fixed. I guess
> > that's
> > harmless for now.
> 
> What I mention above might end up fixing that?

yes, it does.

So the original patch is just fine. Sorry for the noise.

Marc