Re: [PATCHv5 4/6] mmc: dw_mmc-pltfm: socfpga: add method to configure clk-phase

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On 10/21/22 08:32, Krzysztof Kozlowski wrote:
On 19/10/2022 13:06, Dinh Nguyen wrote:
The clock-phase settings for the SDMMC controller in the SoCFPGA
platforms reside in a register in the System Manager. Add a method
to access that register through the syscon interface.

Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
---
v5: change error handling from of_property_read_variable_u32_array()
     support arm32 by reading the reg_shift
v4: no change
v3: add space before &socfpga_drv_data
v2: simplify clk-phase calculations
---
  drivers/mmc/host/dw_mmc-pltfm.c | 43 ++++++++++++++++++++++++++++++++-
  1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
index 9901208be797..74421d13f466 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -17,10 +17,16 @@
  #include <linux/mmc/host.h>
  #include <linux/mmc/mmc.h>
  #include <linux/of.h>
+#include <linux/mfd/altera-sysmgr.h>
+#include <linux/regmap.h>
#include "dw_mmc.h"
  #include "dw_mmc-pltfm.h"
+#define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45
+#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \
+	((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0))
+
  int dw_mci_pltfm_register(struct platform_device *pdev,
  			  const struct dw_mci_drv_data *drv_data)
  {
@@ -62,9 +68,44 @@ const struct dev_pm_ops dw_mci_pltfm_pmops = {
  };
  EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
+static int dw_mci_socfpga_priv_init(struct dw_mci *host)
+{
+	struct device_node *np = host->dev->of_node;
+	struct regmap *sys_mgr_base_addr;
+	u32 clk_phase[2] = {0}, reg_offset, reg_shift;
+	int i, rc, hs_timing;
+
+	rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0);
+	if (rc < 0) {
+		dev_err(host->dev, "clk-phase-sd-hs not found!\n");
+		return rc;
+	}
+
+	sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
+	if (IS_ERR(sys_mgr_base_addr)) {
+		dev_err(host->dev, "failed to find altr,sys-mgr regmap!\n");
+		return -ENODEV;

Isn't this now an ABI break? I have an impression we talked about this...


My fault, I'll make this optional.

Dinh



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