Hi Mike,
On 1/9/14 9:47 PM, Jaehoon Chung wrote:
> Acked-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>
> On 01/10/2014 06:31 AM, dinguyen@xxxxxxxxxx wrote:
>> From: Dinh Nguyen <dinguyen@xxxxxxxxxx>
>>
>> The clk-phase property is used to represent the 2 clock phase values that is
>> needed for the SD/MMC driver. Add a prepare function to the clk_ops, that will
>> use the syscon driver to set sdmmc_clk's phase shift that is located in the
>> system manager.
>>
>> Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
>> Acked-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
>> ---
>> v9: none
>> v8: Use degrees in the clk-phase binding property
>> v7: Add dts property to represent the clk phase of the sdmmc_clk. Add a
>> prepare function to the gate clk that will toggle clock phase setting.
>> Remove the "altr,socfpga-sdmmc-sdr-clk" clock type.
>> v6: Add a new clock type "altr,socfpga-sdmmc-sdr-clk" that will be used to
>> set the phase shift settings.
>> v5: Use the "snps,dw-mshc" binding
>> v4: Use the sdmmc_clk prepare function to set the phase shift settings
>> v3: Not use the syscon driver because as of 3.13-rc1, the syscon driver is
>> loaded after the clock driver.
>> v2: Use the syscon driver
>> ---
>> .../devicetree/bindings/clock/altr_socfpga.txt | 5 ++
>> arch/arm/boot/dts/socfpga.dtsi | 1 +
>> drivers/clk/socfpga/clk-gate.c | 68 ++++++++++++++++++++
>> 3 files changed, 74 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/clock/altr_socfpga.txt b/Documentation/devicetree/bindings/clock/altr_socfpga.txt
>> index 0045433..5dfd145 100644
>> --- a/Documentation/devicetree/bindings/clock/altr_socfpga.txt
>> +++ b/Documentation/devicetree/bindings/clock/altr_socfpga.txt
>> @@ -23,3 +23,8 @@ Optional properties:
>> and the bit index.
>> - div-reg : For "socfpga-gate-clk", div-reg contains the divider register, bit shift,
>> and width.
>> +- clk-phase : For the sdmmc_clk, contains the value of the clock phase that controls
>> + the SDMMC CIU clock. The first value is the clk_sample(smpsel), and the second
>> + value is the cclk_in_drv(drvsel). The clk-phase is used to enable the correct
>> + hold/delay times that is needed for the SD/MMC CIU clock. The values of both
>> + can be 0-315 degrees, in 45 degree increments.
>> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
>> index f936476..e776512 100644
>> --- a/arch/arm/boot/dts/socfpga.dtsi
>> +++ b/arch/arm/boot/dts/socfpga.dtsi
>> @@ -413,6 +413,7 @@
>> compatible = "altr,socfpga-gate-clk";
>> clocks = <&f2s_periph_ref_clk>, <&main_nand_sdmmc_clk>, <&per_nand_mmc_clk>;
>> clk-gate = <0xa0 8>;
>> + clk-phase = <0 135>;
>> };
>>
>> nand_x_clk: nand_x_clk {
>> diff --git a/drivers/clk/socfpga/clk-gate.c b/drivers/clk/socfpga/clk-gate.c
>> index 4efcf4e..501d513 100644
>> --- a/drivers/clk/socfpga/clk-gate.c
>> +++ b/drivers/clk/socfpga/clk-gate.c
>> @@ -19,7 +19,9 @@
>> #include <linux/clkdev.h>
>> #include <linux/clk-provider.h>
>> #include <linux/io.h>
>> +#include <linux/mfd/syscon.h>
>> #include <linux/of.h>
>> +#include <linux/regmap.h>
>>
>> #include "clk.h"
>>
>> @@ -35,6 +37,11 @@
>>
>> #define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)
>>
>> +/* SDMMC Group for System Manager defines */
>> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
>> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
>> + ((((smplsel) & 0x7) << 3) | (((drvsel) & 0x7) << 0))
>> +
>> static u8 socfpga_clk_get_parent(struct clk_hw *hwclk)
>> {
>> u32 l4_src;
>> @@ -115,7 +122,61 @@ static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk,
>> return parent_rate / div;
>> }
>>
>> +static int socfpga_clk_prepare(struct clk_hw *hwclk)
>> +{
>> + struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
>> + struct regmap *sys_mgr_base_addr;
>> + int i;
>> + u32 hs_timing;
>> + u32 clk_phase[2];
>> +
>> + if (socfpgaclk->clk_phase[0] || socfpgaclk->clk_phase[1]) {
>> + sys_mgr_base_addr = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
>> + if (IS_ERR(sys_mgr_base_addr)) {
>> + pr_err("%s: failed to find altr,sys-mgr regmap!\n", __func__);
>> + return -EINVAL;
>> + }
>> +
>> + for (i = 0; i < 2; i++) {
>> + switch (socfpgaclk->clk_phase[i]) {
>> + case 0:
>> + clk_phase[i] = 0;
>> + break;
>> + case 45:
>> + clk_phase[i] = 1;
>> + break;
>> + case 90:
>> + clk_phase[i] = 2;
>> + break;
>> + case 135:
>> + clk_phase[i] = 3;
>> + break;
>> + case 180:
>> + clk_phase[i] = 4;
>> + break;
>> + case 225:
>> + clk_phase[i] = 5;
>> + break;
>> + case 270:
>> + clk_phase[i] = 6;
>> + break;
>> + case 315:
>> + clk_phase[i] = 7;
>> + break;
>> + default:
>> + clk_phase[i] = 0;
>> + break;
>> + }
>> + }
>> + hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1]);
>> + regmap_write(sys_mgr_base_addr, SYSMGR_SDMMCGRP_CTRL_OFFSET,
>> + hs_timing);
>> + }
>> + return 0;
>> +}
>> +
>> static struct clk_ops gateclk_ops = {
>> + .prepare = socfpga_clk_prepare,
>> .recalc_rate = socfpga_clk_recalc_rate,
>> .get_parent = socfpga_clk_get_parent,
>> .set_parent = socfpga_clk_set_parent,
>> @@ -126,6 +187,7 @@ static void __init __socfpga_gate_init(struct device_node *node,
>> {
>> u32 clk_gate[2];
>> u32 div_reg[3];
>> + u32 clk_phase[2];
>> u32 fixed_div;
>> struct clk *clk;
>> struct socfpga_gate_clk *socfpga_clk;
>> @@ -166,6 +228,12 @@ static void __init __socfpga_gate_init(struct device_node *node,
>> socfpga_clk->div_reg = 0;
>> }
>>
>> + rc = of_property_read_u32_array(node, "clk-phase", clk_phase, 2);
>> + if (!rc) {
>> + socfpga_clk->clk_phase[0] = clk_phase[0];
>> + socfpga_clk->clk_phase[1] = clk_phase[1];
>> + }
>> +
>> of_property_read_string(node, "clock-output-names", &clk_name);
>>
>> init.name = clk_name;
>>
Can you apply this to your clk tree?
Thanks,
Dinh
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