[PATCHv9,4/6] mmc: dw_mmc-pltfm: socfpga: add method to configure clk-phase

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@kernel.org>
---
v9: no changes
v8: no changes
v7: use dev_warn if clk-phase-sd-hs is specified, but "altr,sysmgr-syscon"
    is not found
v6: not getting the clk-phase-sd-hs is not a hard failure
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 | 41 ++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

On Tue, 15 Nov 2022 at 00:02, Dinh Nguyen <dinguyen@kernel.org> 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@kernel.org>

Applied for next, thanks!

Kind regards
Uffe


> ---
> v9: no changes
> v8: no changes
> v7: use dev_warn if clk-phase-sd-hs is specified, but "altr,sysmgr-syscon"
>     is not found
> v6: not getting the clk-phase-sd-hs is not a hard failure
> 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 | 41 ++++++++++++++++++++++++++++++++-
>  1 file changed, 40 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index 9901208be797..13e55cff8237 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 +68,42 @@ 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)
> +               return 0;
> +
> +       sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
> +       if (IS_ERR(sys_mgr_base_addr)) {
> +               dev_warn(host->dev, "clk-phase-sd-hs was specified, but failed to find altr,sys-mgr regmap!\n");
> +               return 0;
> +       }
> +
> +       of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, &reg_offset);
> +       of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_shift);
> +
> +       for (i = 0; i < ARRAY_SIZE(clk_phase); i++)
> +               clk_phase[i] /= SOCFPGA_DW_MMC_CLK_PHASE_STEP;
> +
> +       hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1], reg_shift);
> +       regmap_write(sys_mgr_base_addr, reg_offset, hs_timing);
> +
> +       return 0;
> +}
> +
> +static const struct dw_mci_drv_data socfpga_drv_data = {
> +       .init           = dw_mci_socfpga_priv_init,
> +};
> +
>  static const struct of_device_id dw_mci_pltfm_match[] = {
>         { .compatible = "snps,dw-mshc", },
> -       { .compatible = "altr,socfpga-dw-mshc", },
> +       { .compatible = "altr,socfpga-dw-mshc", .data = &socfpga_drv_data, },
>         { .compatible = "img,pistachio-dw-mshc", },
>         {},
>  };
> --
> 2.25.1
>