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Subject[PATCH] ARM: imx: enable bus auto clock gating function for i.mx6sll
Date
i.MX6SLL has HW bus auto clock gating function, enable
it by default to save VDD_SOC_IN power, about 5% ~ 20%
saved depends on different use cases.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
arch/arm/mach-imx/pm-imx6.c | 11 +++++++++--
include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 3 +++
2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index 791e1fd..b08e407 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -648,10 +648,17 @@ void __init imx6dl_pm_init(void)

void __init imx6sl_pm_init(void)
{
- if (cpu_is_imx6sl())
+ struct regmap *gpr;
+
+ if (cpu_is_imx6sl()) {
imx6_pm_common_init(&imx6sl_pm_data);
- else
+ } else {
imx6_pm_common_init(&imx6sll_pm_data);
+ gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
+ if (!IS_ERR(gpr))
+ regmap_update_bits(gpr, IOMUXC_GPR5,
+ IMX6SLL_GPR5_AFCG_X_BYPASS_MASK, 0);
+ }
}

void __init imx6sx_pm_init(void)
diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
index e06f5f7..6c1ad16 100644
--- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
+++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
@@ -457,4 +457,7 @@
#define MCLK_DIR(x) (x == 1 ? IMX6UL_GPR1_SAI1_MCLK_DIR : x == 2 ? \
IMX6UL_GPR1_SAI2_MCLK_DIR : IMX6UL_GPR1_SAI3_MCLK_DIR)

+/* For imx6sll iomux gpr register field define */
+#define IMX6SLL_GPR5_AFCG_X_BYPASS_MASK (0x1f << 11)
+
#endif /* __LINUX_IMX6Q_IOMUXC_GPR_H */
--
2.7.4
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