pwm-backlight: set pwm-bl default-frequency

diff --git a/arch/arm/boot/dts/rk3188-tb.dts b/arch/arm/boot/dts/rk3188-tb.dts
index f3ff42b39f98efd8bb4bb4c277c114bade1fc6da..b95d13272e654de1f6ecfb951dff4b7f65cb8c30 100755 (executable)
--- a/arch/arm/boot/dts/rk3188-tb.dts
+++ b/arch/arm/boot/dts/rk3188-tb.dts
@@ -21,7 +21,8 @@
 
        backlight {
                compatible = "pwm-backlight";
-               pwms = <&pwm3 0 5000000>;
+               pwms = <&pwm3 0 25000>;
+               pwm_period = <20000>;
                brightness-levels = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255>;
                default-brightness-level = <128>;
                enable-gpios = <&gpio0 GPIO_A2 GPIO_ACTIVE_HIGH>;

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 209d5a085f9da3759e5d7aec8557389c432e6d99..78ea6ea02e5528158dbcf0cf876c6b5d96e10d14 100644 (file)
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -144,6 +144,7 @@ static int pwm_backlight_parse_dt(struct device *dev,
        int length;
        u32 value;
        int ret;
+       bool status;
 
        if (!node)
                return -ENODEV;
@@ -179,7 +180,13 @@ static int pwm_backlight_parse_dt(struct device *dev,
                data->dft_brightness = value;
                data->max_brightness--;
        }
-
+       status = of_property_read_bool(node,"pwm_period");
+       if(status){
+               of_property_read_u32(node, "pwm_period", &value);
+               data->pwm_period_ns = 1000000000/value/2;
+               if(data->pwm_period_ns > 25000)
+                       data->pwm_period_ns = 25000;
+       }
        data->enable_gpio = of_get_named_gpio_flags(node, "enable-gpios", 0,
                                                    &flags);
        if (data->enable_gpio == -EPROBE_DEFER)