mmc: tegra: Parse default trim and tap from dt

Parse the default inbound and outbound sampling trimmer values from
the device tree.
Signed-off-by: NAapo Vienamo <avienamo@nvidia.com>
Acked-by: NThierry Reding <treding@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-tegra.c

@@ -107,6 +107,9 @@ struct sdhci_tegra {
 	struct pinctrl_state *pinctrl_state_1v8;
 
 	struct sdhci_tegra_autocal_offsets autocal_offsets;
+
+	u32 default_tap;
+	u32 default_trim;
 };
 
 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
@@ -461,6 +464,23 @@ static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host)
 		autocal->pull_down_hs400 = autocal->pull_down_1v8;
 }
 
+static void tegra_sdhci_parse_default_tap_and_trim(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
+	int err;
+
+	err = device_property_read_u32(host->mmc->parent, "nvidia,default-tap",
+				       &tegra_host->default_tap);
+	if (err)
+		tegra_host->default_tap = 0;
+
+	err = device_property_read_u32(host->mmc->parent, "nvidia,default-trim",
+				       &tegra_host->default_trim);
+	if (err)
+		tegra_host->default_trim = 0;
+}
+
 static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -881,6 +901,8 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 
 	tegra_sdhci_parse_pad_autocal_dt(host);
 
+	tegra_sdhci_parse_default_tap_and_trim(host);
+
 	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
 							 GPIOD_OUT_HIGH);
 	if (IS_ERR(tegra_host->power_gpio)) {