[U-Boot] [PATCH v5 23/26] spi: sun4i: Add CLK support
Jagan Teki
jagan at amarulasolutions.com
Mon Dec 31 16:59:24 UTC 2018
Add CLK support to enable AHB and MOD SPI clocks
on sun4i_spi driver.
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
drivers/spi/sun4i_spi.c | 46 +++++++++++++++++++++++++++++++++++------
1 file changed, 40 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/sun4i_spi.c b/drivers/spi/sun4i_spi.c
index b86b5a00ad..5b01aa4226 100644
--- a/drivers/spi/sun4i_spi.c
+++ b/drivers/spi/sun4i_spi.c
@@ -19,6 +19,7 @@
*/
#include <common.h>
+#include <clk.h>
#include <dm.h>
#include <spi.h>
#include <errno.h>
@@ -114,6 +115,8 @@ struct sun4i_spi_platdata {
struct sun4i_spi_priv {
struct sun4i_spi_regs *regs;
+ struct clk ahb_clk;
+ struct clk mod_clk;
u32 freq;
u32 mode;
@@ -238,13 +241,40 @@ static int sun4i_spi_parse_pins(struct udevice *dev)
return 0;
}
-static inline void sun4i_spi_enable_clock(void)
+static inline int sun4i_spi_enable_clock(struct udevice *dev)
{
- struct sunxi_ccm_reg *const ccm =
- (struct sunxi_ccm_reg *const)SUNXI_CCM_BASE;
+ struct sun4i_spi_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = clk_get_by_name(dev, "ahb", &priv->ahb_clk);
+ if (ret) {
+ dev_err(dev, "failed to get ahb clock\n");
+ return ret;
+ }
+
+ ret = clk_get_by_name(dev, "mod", &priv->mod_clk);
+ if (ret) {
+ dev_err(dev, "failed to get mod clock\n");
+ return ret;
+ }
+
+ ret = clk_enable(&priv->ahb_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable ahb clock (ret=%d)\n", ret);
+ return ret;
+ }
+
+ ret = clk_enable(&priv->mod_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable mod clock (ret=%d)\n", ret);
+ goto err_ahb;
+ }
- setbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_SPI0));
- writel((1 << 31), &ccm->spi0_clk_cfg);
+ return 0;
+
+err_ahb:
+ clk_disable(&priv->ahb_clk);
+ return ret;
}
static int sun4i_spi_ofdata_to_platdata(struct udevice *bus)
@@ -267,8 +297,12 @@ static int sun4i_spi_probe(struct udevice *bus)
{
struct sun4i_spi_platdata *plat = dev_get_platdata(bus);
struct sun4i_spi_priv *priv = dev_get_priv(bus);
+ int ret;
+
+ ret = sun4i_spi_enable_clock(bus);
+ if (ret)
+ return ret;
- sun4i_spi_enable_clock();
sun4i_spi_parse_pins(bus);
priv->regs = (struct sun4i_spi_regs *)(uintptr_t)plat->base_addr;
--
2.18.0.321.gffc6fa0e3
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