diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0434-clk-bcm2835-Do-appropriate-name-lookups-for-DSI1-s-p.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0434-clk-bcm2835-Do-appropriate-name-lookups-for-DSI1-s-p.patch | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0434-clk-bcm2835-Do-appropriate-name-lookups-for-DSI1-s-p.patch b/target/linux/brcm2708/patches-4.4/0434-clk-bcm2835-Do-appropriate-name-lookups-for-DSI1-s-p.patch new file mode 100644 index 0000000000..ab7eff3cd9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0434-clk-bcm2835-Do-appropriate-name-lookups-for-DSI1-s-p.patch @@ -0,0 +1,125 @@ +From b0fde8ea889e47505e4112d89da4be9469a37775 Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Thu, 14 Apr 2016 15:13:53 -0700 +Subject: [PATCH] clk: bcm2835: Do appropriate name lookups for DSI1's parents + as well. + +Signed-off-by: Eric Anholt <eric@anholt.net> +--- + .../bindings/clock/brcm,bcm2835-cprman.txt | 12 ++++- + drivers/clk/bcm/clk-bcm2835.c | 54 +++++++++++++++++----- + 2 files changed, 54 insertions(+), 12 deletions(-) + +--- a/Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt ++++ b/Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt +@@ -16,7 +16,17 @@ Required properties: + - #clock-cells: Should be <1>. The permitted clock-specifier values can be + found in include/dt-bindings/clock/bcm2835.h + - reg: Specifies base physical address and size of the registers +-- clocks: The external oscillator clock phandle ++- clocks: phandles to the parent clocks used as input to the module, in ++ the following order: ++ ++ - External oscillator ++ - DSI1 byte clock ++ - DSI1 DDR2 clock ++ - DSI1 DDR clock ++ ++ Only external oscillator is required. The DSI clocks may ++ not be present, in which case their children will be ++ unusable. + + Example: + +--- a/drivers/clk/bcm/clk-bcm2835.c ++++ b/drivers/clk/bcm/clk-bcm2835.c +@@ -297,11 +297,29 @@ + #define LOCK_TIMEOUT_NS 100000000 + #define BCM2835_MAX_FB_RATE 1750000000u + ++/* ++ * Names of clocks used within the driver that need to be replaced ++ * with an external parent's name. This array is in the order that ++ * the clocks node in the DT references external clocks. ++ */ ++static const char *cprman_parent_names[] = { ++ "xosc", ++ "dsi1_byte", ++ "dsi1_ddr2", ++ "dsi1_ddr", ++}; ++ + struct bcm2835_cprman { + struct device *dev; + void __iomem *regs; + spinlock_t regs_lock; /* spinlock for all clocks */ +- const char *osc_name; ++ ++ /* ++ * Real names of cprman clock parents looked up through ++ * of_clk_get_parent_name(), which will be used in the ++ * parent_names[] arrays for clock registration. ++ */ ++ const char *real_parent_names[ARRAY_SIZE(cprman_parent_names)]; + + struct clk_onecell_data onecell; + struct clk *clks[]; +@@ -1168,7 +1186,7 @@ static struct clk *bcm2835_register_pll( + memset(&init, 0, sizeof(init)); + + /* All of the PLLs derive from the external oscillator. */ +- init.parent_names = &cprman->osc_name; ++ init.parent_names = &cprman->real_parent_names[0]; + init.num_parents = 1; + init.name = data->name; + init.ops = &bcm2835_pll_clk_ops; +@@ -1251,17 +1269,21 @@ static struct clk *bcm2835_register_cloc + struct bcm2835_clock *clock; + struct clk_init_data init; + const char *parents[1 << CM_SRC_BITS]; +- size_t i; ++ size_t i, j; + + /* +- * Replace our "xosc" references with the oscillator's +- * actual name. ++ * Replace our strings referencing parent clocks with the ++ * actual clock-output-name of the parent. + */ + for (i = 0; i < data->num_mux_parents; i++) { +- if (strcmp(data->parents[i], "xosc") == 0) +- parents[i] = cprman->osc_name; +- else +- parents[i] = data->parents[i]; ++ parents[i] = data->parents[i]; ++ ++ for (j = 0; j < ARRAY_SIZE(cprman_parent_names); j++) { ++ if (strcmp(parents[i], cprman_parent_names[j]) == 0) { ++ parents[i] = cprman->real_parent_names[j]; ++ break; ++ } ++ } + } + + memset(&init, 0, sizeof(init)); +@@ -1883,8 +1905,18 @@ static int bcm2835_clk_probe(struct plat + if (IS_ERR(cprman->regs)) + return PTR_ERR(cprman->regs); + +- cprman->osc_name = of_clk_get_parent_name(dev->of_node, 0); +- if (!cprman->osc_name) ++ for (i = 0; i < ARRAY_SIZE(cprman_parent_names); i++) { ++ cprman->real_parent_names[i] = ++ of_clk_get_parent_name(dev->of_node, i); ++ } ++ /* ++ * Make sure the external oscillator has been registered. ++ * ++ * The other (DSI) clocks are not present on older device ++ * trees, which we still need to support for backwards ++ * compatibility. ++ */ ++ if (!cprman->real_parent_names[0]) + return -ENODEV; + + platform_set_drvdata(pdev, cprman); |