The SDHCI SCLK clock in Samsung's S5P SoC's can be configured for required
clock speeds. This patch adds SDHCI SCLK configuration functionality for
S5P SoC's.
Signed-off-by: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
---
arch/arm/plat-s5p/clock.c | 21 +++++++++++++++++++++
arch/arm/plat-s5p/include/plat/s5p-clock.h | 2 ++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-s5p/clock.c b/arch/arm/plat-s5p/clock.c
index aa96e33..12970ed 100644
--- a/arch/arm/plat-s5p/clock.c
+++ b/arch/arm/plat-s5p/clock.c
@@ -19,11 +19,13 @@
#include <linux/clk.h>
#include <linux/sysdev.h>
#include <linux/io.h>
+#include <linux/platform_device.h>
#include <asm/div64.h>
#include <plat/clock.h>
#include <plat/clock-clksrc.h>
#include <plat/s5p-clock.h>
+#include <plat/sdhci.h>
/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
* clk_ext_xtal_mux.
@@ -147,3 +149,22 @@ void __init s5p_register_clocks(unsigned long xtal_freq)
if (ret > 0)
printk(KERN_ERR "Failed to register s5p clocks\n");
}
+
+#ifdef CONFIG_MMC_SDHCI_S3C
+int s5p_setup_sdhci_sclk(struct platform_device *pdev, struct clk *parent)
+{
+ struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
+ struct device *dev = &pdev->dev;
+ struct clk *sclk_mmc;
+
+ sclk_mmc = clk_get(dev, "mmc_bus");
+ if (IS_ERR(sclk_mmc)) {
+ dev_err(dev, "failed to get mmc_bus clock\n");
+ return PTR_ERR(sclk_mmc);
+ }
+
+ sclk_mmc->ops->set_parent(sclk_mmc, parent);
+ sclk_mmc->ops->set_rate(sclk_mmc, pdata->sclk_mmc_freq);
+ return 0;
+}
+#endif /* CONFIG_MMC_SDHCI_S3C */
diff --git a/arch/arm/plat-s5p/include/plat/s5p-clock.h b/arch/arm/plat-s5p/include/plat/s5p-clock.h
index 56fb8b4..3855f74 100644
--- a/arch/arm/plat-s5p/include/plat/s5p-clock.h
+++ b/arch/arm/plat-s5p/include/plat/s5p-clock.h
@@ -36,5 +36,7 @@ extern struct clksrc_sources clk_src_epll;
extern int s5p6440_clk48m_ctrl(struct clk *clk, int enable);
extern int s5p_gatectrl(void __iomem *reg, struct clk *clk, int enable);
+extern int s5p_setup_sdhci_sclk(struct platform_device *pdev,
+ struct clk *parent);
#endif /* __ASM_PLAT_S5P_CLOCK_H */
--
1.6.6.rc2
--
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