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64550c7f4d
Linux DTs stuff a value indicating if the USID is a USID or a GSID in the reg property, the Linux SPMI driver then reads the two address cells separately. U-boot's dev_read_addr() doesn't know how to handle this, so use ofnode_read_u32_index() to get just the USID. The Qcom pmic driver doesn't have support for GSID handling, so just ignore the second value for now. Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Tested-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
93 lines
2 KiB
C
93 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Qualcomm generic pmic driver
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <power/pmic.h>
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#include <spmi/spmi.h>
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#define PID_SHIFT 8
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#define PID_MASK (0xFF << PID_SHIFT)
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#define REG_MASK 0xFF
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struct pmic_qcom_priv {
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uint32_t usid; /* Slave ID on SPMI bus */
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};
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static int pmic_qcom_reg_count(struct udevice *dev)
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{
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return 0xFFFF;
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}
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static int pmic_qcom_write(struct udevice *dev, uint reg, const uint8_t *buff,
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int len)
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{
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struct pmic_qcom_priv *priv = dev_get_priv(dev);
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if (len != 1)
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return -EINVAL;
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return spmi_reg_write(dev->parent, priv->usid,
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(reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
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*buff);
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}
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static int pmic_qcom_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
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{
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struct pmic_qcom_priv *priv = dev_get_priv(dev);
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int val;
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if (len != 1)
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return -EINVAL;
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val = spmi_reg_read(dev->parent, priv->usid,
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(reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
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if (val < 0)
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return val;
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*buff = val;
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return 0;
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}
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static struct dm_pmic_ops pmic_qcom_ops = {
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.reg_count = pmic_qcom_reg_count,
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.read = pmic_qcom_read,
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.write = pmic_qcom_write,
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};
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static const struct udevice_id pmic_qcom_ids[] = {
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{ .compatible = "qcom,spmi-pmic" },
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{ }
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};
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static int pmic_qcom_probe(struct udevice *dev)
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{
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struct pmic_qcom_priv *priv = dev_get_priv(dev);
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int ret;
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/*
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* dev_read_addr() can't be used here because the reg property actually
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* contains two discrete values, not a single 64-bit address.
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* The address is the first value.
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*/
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ret = ofnode_read_u32_index(dev_ofnode(dev), "reg", 0, &priv->usid);
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if (ret < 0)
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return -EINVAL;
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debug("usid: %d\n", priv->usid);
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return 0;
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}
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U_BOOT_DRIVER(pmic_qcom) = {
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.name = "pmic_qcom",
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.id = UCLASS_PMIC,
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.of_match = pmic_qcom_ids,
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.bind = dm_scan_fdt_dev,
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.probe = pmic_qcom_probe,
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.ops = &pmic_qcom_ops,
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.priv_auto = sizeof(struct pmic_qcom_priv),
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};
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