This adds support for sdhc-msm controllers to get supported
clk-rates from DT. sdhci-msm would need it's own set_clock
ops to be implemented. For this, supported clk-rates needs
to be populated in sdhci_msm_pltfm_data.
Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/mmc/sdhci-msm.txt | 1 +
drivers/mmc/host/sdhci-msm.c | 48 ++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
index 485483a..6a83b38 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
@@ -17,6 +17,7 @@ Required properties:
"iface" - Main peripheral bus clock (PCLK/HCLK - AHB Bus clock) (required)
"core" - SDC MMC clock (MCLK) (required)
"bus" - SDCC bus voter clock (optional)
+- clk-rates: Array of supported GCC clock frequencies for sdhc, Units - Hz.
Example:
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 85ddaae..042ecb2 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -81,6 +81,8 @@ struct sdhci_msm_host {
struct clk *clk; /* main SD/MMC bus clock */
struct clk *pclk; /* SDHC peripheral bus clock */
struct clk *bus_clk; /* SDHC bus voter clock */
+ u32 *clk_table;
+ int clk_table_sz;
struct mmc_host *mmc;
bool use_14lpp_dll_reset;
};
@@ -582,6 +584,50 @@ static const struct sdhci_pltfm_data sdhci_msm_pdata = {
.ops = &sdhci_msm_ops,
};
+static int sdhci_msm_dt_get_array(struct device *dev, const char *prop_name,
+ u32 **table, int *size)
+{
+ struct device_node *np = dev->of_node;
+ int count, ret;
+ u32 *arr;
+
+ count = of_property_count_elems_of_size(np, prop_name, sizeof(u32));
+ if (count < 0) {
+ dev_warn(dev, "%s: Invalid dt property, err(%d)\n",
+ prop_name, count);
+ return count;
+ }
+
+ arr = kcalloc(count, sizeof(*arr), GFP_KERNEL);
+ if (!arr)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, prop_name, arr, count);
+ if (ret) {
+ kfree(arr);
+ dev_warn(dev, "%s Invalid dt array property, err(%d)\n",
+ prop_name, ret);
+ return ret;
+ }
+ *table = arr;
+ *size = count;
+ return 0;
+}
+
+void sdhci_msm_populate_dt(struct device *dev,
+ struct sdhci_msm_host *msm_host)
+{
+ int table_sz = 0;
+ u32 *table = NULL;
+
+ if (sdhci_msm_dt_get_array(dev, "clk-rates", &table, &table_sz)) {
+ dev_warn(dev, "failed in DT parsing for supported clk-rates\n");
+ return;
+ }
+ msm_host->clk_table = table;
+ msm_host->clk_table_sz = table_sz;
+}
+
static int sdhci_msm_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
@@ -608,6 +654,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
sdhci_get_of_property(pdev);
+ sdhci_msm_populate_dt(&pdev->dev, msm_host);
+
/* Setup SDCC bus voter clock. */
msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (!IS_ERR(msm_host->bus_clk)) {
--
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