spi: Add support for SPL_OF_PLATDATA to mxs_spi.c driver

After this patch the mxs_spi.c DM/DTS driver can be used at early SPL to
read payload from SPI-NOR memories.

It was necessary to adjust its name to 'fsl_imx_2{38}_spi' to match
requirements for SPL_OF_PLATDATA usage.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c
index d475830f17857189adaea590d54bb198a82c46e4..58b1c67a19147b9ef5b539181e23e6d62830e954 100644 (file)
--- a/drivers/spi/mxs_spi.c
+++ b/drivers/spi/mxs_spi.c
@@ -57,7 +57,18 @@ static inline struct mxs_spi_slave *to_mxs_slave(struct spi_slave *slave)
 #else
 #include <dm.h>
 #include <errno.h>
+#include <dt-structs.h>
+
+#ifdef CONFIG_MX28
+#define dtd_fsl_imx_spi dtd_fsl_imx28_spi
+#else /* CONFIG_MX23 */
+#define dtd_fsl_imx_spi dtd_fsl_imx23_spi
+#endif
+
 struct mxs_spi_platdata {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+       struct dtd_fsl_imx_spi dtplat;
+#endif
        s32 frequency;          /* Default clock frequency, -1 for none */
        fdt_addr_t base;        /* SPI IP block base address */
        int num_cs;             /* Number of CSes supported */
@@ -430,11 +441,26 @@ static int mxs_spi_probe(struct udevice *bus)
        int ret;
 
        debug("%s: probe\n", __func__);
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+       struct dtd_fsl_imx_spi *dtplat = &plat->dtplat;
+       struct phandle_1_arg *p1a = &dtplat->clocks[0];
+
+       priv->regs = (struct mxs_ssp_regs *)dtplat->reg[0];
+       priv->dma_channel = dtplat->dmas[1];
+       priv->clk_id = p1a->arg[0];
+       priv->max_freq = dtplat->spi_max_frequency;
+       plat->num_cs = dtplat->num_cs;
+
+       debug("OF_PLATDATA: regs: 0x%x max freq: %d clkid: %d\n",
+             (unsigned int)priv->regs, priv->max_freq, priv->clk_id);
+#else
        priv->regs = (struct mxs_ssp_regs *)plat->base;
        priv->max_freq = plat->frequency;
 
        priv->dma_channel = plat->dma_id;
        priv->clk_id = plat->clk_id;
+#endif
 
        mxs_reset_block(&priv->regs->hw_ssp_ctrl0_reg);
 
@@ -571,16 +597,20 @@ static int mxs_ofdata_to_platdata(struct udevice *bus)
 
        return 0;
 }
-#endif
 
 static const struct udevice_id mxs_spi_ids[] = {
        { .compatible = "fsl,imx23-spi" },
        { .compatible = "fsl,imx28-spi" },
        { }
 };
+#endif
 
 U_BOOT_DRIVER(mxs_spi) = {
-       .name   = "mxs_spi",
+#ifdef CONFIG_MX28
+       .name = "fsl_imx28_spi",
+#else /* CONFIG_MX23 */
+       .name = "fsl_imx23_spi",
+#endif
        .id     = UCLASS_SPI,
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
        .of_match = mxs_spi_ids,