On 28 June 2016 at 19:56, Jorge Ramirez [off-list ref] wrote:

On 06/28/2016 12:31 PM, Guodong Xu wrote:

quoted

From: Jorge Ramirez-Ortiz <redacted>

Early at boot, during the sys_clk initialization, make sure UART1 uses
the higher frequency clock.

This enables support for higher baud rates (up to 3Mbps) required to
support faster bluetooth transfers.

Signed-off-by: Jorge Ramirez-Ortiz <redacted>
Signed-off-by: Guodong Xu <redacted>
---
  drivers/clk/hisilicon/clk-hi6220.c | 12 ++++++++++--
  1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/hisilicon/clk-hi6220.c

b/drivers/clk/hisilicon/clk-hi6220.c
index a36ffcb..55bd9bb 100644

--- a/drivers/clk/hisilicon/clk-hi6220.c
+++ b/drivers/clk/hisilicon/clk-hi6220.c

@@ -11,6 +11,7 @@
   */
    #include <linux/kernel.h>
+#include <linux/clk.h>
  #include <linux/clk-provider.h>
  #include <linux/clkdev.h>
  #include <linux/io.h>

@@ -70,10 +71,10 @@ static struct hisi_gate_clock

hi6220_separated_gate_clks_ao[] __initdata = {
        { HI6220_UART0_PCLK,  "uart0_pclk",  "clk_tcxo",
CLK_SET_RATE_PARENT|CLK_IGNORE_UNUSED, 0x630, 24, 0, },
  };
  +static struct hisi_clock_data *clk_data_ao;
+
  static void __init hi6220_clk_ao_init(struct device_node *np)
  {
-       struct hisi_clock_data *clk_data_ao;
-
        clk_data_ao = hisi_clk_init(np, HI6220_AO_NR_CLKS);
        if (!clk_data_ao)
                return;

@@ -192,6 +193,13 @@ static void __init hi6220_clk_sys_init(struct

device_node *np)
        hi6220_clk_register_divider(hi6220_div_clks_sys,
                        ARRAY_SIZE(hi6220_div_clks_sys), clk_data);
+
+       if (!clk_data_ao)
+               return;
+
+       /* enable high speed clock on UART1 mux */
+       clk_set_parent(clk_data->clk_data.clks[HI6220_UART1_SRC],
+                       clk_data_ao->clk_data.clks[HI6220_150M]);
  }
  CLK_OF_DECLARE(hi6220_clk_sys, "hisilicon,hi6220-sysctrl",
hi6220_clk_sys_init);

please bear with me on this. it does need rework.

V2 was sent. Thanks Jorge.

-Guodong