allwinner: Scan AXP803 FDT node to setup initial power rails
Now that we have a pointer to the device tree blob, let's use that to do some initial setup of the PMIC: - We scan the DT for the compatible string to find the PMIC node. - We switch the N_VBUSEN pin if the DT property tells us so. - We scan over all regulator subnodes, and switch DC1SW if there is at least one other node referencing it (judging by the existence of a phandle property in that subnode). This is just the first part of the setup, a follow up patch will setup voltages. Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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@ -10,6 +10,7 @@
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#include <debug.h>
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#include <delay_timer.h>
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#include <errno.h>
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#include <libfdt.h>
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#include <mmio.h>
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#include <platform_def.h>
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#include <sunxi_def.h>
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@ -126,6 +127,52 @@ static int axp_setbits(uint8_t reg, uint8_t set_mask)
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return rsb_write(AXP803_RT_ADDR, reg, regval);
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}
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static bool should_enable_regulator(const void *fdt, int node)
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{
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if (fdt_getprop(fdt, node, "phandle", NULL) != NULL)
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return true;
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if (fdt_getprop(fdt, node, "regulator-always-on", NULL) != NULL)
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return true;
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return false;
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}
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static void setup_axp803_rails(const void *fdt)
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{
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int node;
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/* locate the PMIC DT node, bail out if not found */
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node = fdt_node_offset_by_compatible(fdt, -1, "x-powers,axp803");
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if (node == -FDT_ERR_NOTFOUND) {
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WARN("BL31: PMIC: No AXP803 DT node, skipping initial setup.\n");
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return;
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}
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if (fdt_getprop(fdt, node, "x-powers,drive-vbus-en", NULL))
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axp_setbits(0x8f, BIT(4));
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/* descend into the "regulators" subnode */
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node = fdt_first_subnode(fdt, node);
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/* iterate over all regulators to find used ones */
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for (node = fdt_first_subnode(fdt, node);
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node != -FDT_ERR_NOTFOUND;
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node = fdt_next_subnode(fdt, node)) {
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const char *name;
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int length;
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/* We only care if it's always on or referenced. */
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if (!should_enable_regulator(fdt, node))
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continue;
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name = fdt_get_name(fdt, node, &length);
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if (!strncmp(name, "dc1sw", length)) {
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INFO("PMIC: AXP803: Enabling DC1SW\n");
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axp_setbits(0x12, BIT(7));
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continue;
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}
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}
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}
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int sunxi_pmic_setup(uint16_t socid, const void *fdt)
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{
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int ret;
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@ -148,6 +195,9 @@ int sunxi_pmic_setup(uint16_t socid, const void *fdt)
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pmic = AXP803_RSB;
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NOTICE("BL31: PMIC: Detected AXP803 on RSB.\n");
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if (fdt)
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setup_axp803_rails(fdt);
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break;
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default:
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NOTICE("BL31: PMIC: No support for Allwinner %x SoC.\n", socid);
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