From ba3b7e4753c5ad80b3670277a2104aeb421e0d7d Mon Sep 17 00:00:00 2001 From: Herve Codina Date: Tue, 5 Dec 2023 16:21:03 +0100 Subject: soc: fsl: cpm1: qmc: Add support for child devices QMC child devices support is needed to avoid orphan DT nodes that use a simple DT phandle to reference a QMC channel. Allow to instantiate child devices and also extend the API to get the qmc_chan using a child device. Signed-off-by: Herve Codina Link: https://lore.kernel.org/r/20231205152116.122512-7-herve.codina@bootlin.com --- drivers/soc/fsl/qe/qmc.c | 91 +++++++++++++++++++++++++++++++++++++----------- 1 file changed, 71 insertions(+), 20 deletions(-) (limited to 'drivers/soc') diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c index 27f2f16deac9..e716f13669a0 100644 --- a/drivers/soc/fsl/qe/qmc.c +++ b/drivers/soc/fsl/qe/qmc.c @@ -1425,8 +1425,16 @@ static int qmc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, qmc); + /* Populate channel related devices */ + ret = devm_of_platform_populate(qmc->dev); + if (ret) + goto err_disable_txrx; + return 0; +err_disable_txrx: + qmc_setbits32(qmc->scc_regs + SCC_GSMRL, 0); + err_disable_intr: qmc_write16(qmc->scc_regs + SCC_SCCM, 0); @@ -1465,26 +1473,16 @@ static struct platform_driver qmc_driver = { }; module_platform_driver(qmc_driver); -struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phandle_name) +static struct qmc_chan *qmc_chan_get_from_qmc(struct device_node *qmc_np, unsigned int chan_index) { - struct of_phandle_args out_args; struct platform_device *pdev; struct qmc_chan *qmc_chan; struct qmc *qmc; - int ret; - ret = of_parse_phandle_with_fixed_args(np, phandle_name, 1, 0, - &out_args); - if (ret < 0) - return ERR_PTR(ret); - - if (!of_match_node(qmc_driver.driver.of_match_table, out_args.np)) { - of_node_put(out_args.np); + if (!of_match_node(qmc_driver.driver.of_match_table, qmc_np)) return ERR_PTR(-EINVAL); - } - pdev = of_find_device_by_node(out_args.np); - of_node_put(out_args.np); + pdev = of_find_device_by_node(qmc_np); if (!pdev) return ERR_PTR(-ENODEV); @@ -1494,17 +1492,12 @@ struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phan return ERR_PTR(-EPROBE_DEFER); } - if (out_args.args_count != 1) { + if (chan_index >= ARRAY_SIZE(qmc->chans)) { platform_device_put(pdev); return ERR_PTR(-EINVAL); } - if (out_args.args[0] >= ARRAY_SIZE(qmc->chans)) { - platform_device_put(pdev); - return ERR_PTR(-EINVAL); - } - - qmc_chan = qmc->chans[out_args.args[0]]; + qmc_chan = qmc->chans[chan_index]; if (!qmc_chan) { platform_device_put(pdev); return ERR_PTR(-ENOENT); @@ -1512,8 +1505,44 @@ struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phan return qmc_chan; } + +struct qmc_chan *qmc_chan_get_byphandle(struct device_node *np, const char *phandle_name) +{ + struct of_phandle_args out_args; + struct qmc_chan *qmc_chan; + int ret; + + ret = of_parse_phandle_with_fixed_args(np, phandle_name, 1, 0, + &out_args); + if (ret < 0) + return ERR_PTR(ret); + + if (out_args.args_count != 1) { + of_node_put(out_args.np); + return ERR_PTR(-EINVAL); + } + + qmc_chan = qmc_chan_get_from_qmc(out_args.np, out_args.args[0]); + of_node_put(out_args.np); + return qmc_chan; +} EXPORT_SYMBOL(qmc_chan_get_byphandle); +struct qmc_chan *qmc_chan_get_bychild(struct device_node *np) +{ + struct device_node *qmc_np; + u32 chan_index; + int ret; + + qmc_np = np->parent; + ret = of_property_read_u32(np, "reg", &chan_index); + if (ret) + return ERR_PTR(-EINVAL); + + return qmc_chan_get_from_qmc(qmc_np, chan_index); +} +EXPORT_SYMBOL(qmc_chan_get_bychild); + void qmc_chan_put(struct qmc_chan *chan) { put_device(chan->qmc->dev); @@ -1550,6 +1579,28 @@ struct qmc_chan *devm_qmc_chan_get_byphandle(struct device *dev, } EXPORT_SYMBOL(devm_qmc_chan_get_byphandle); +struct qmc_chan *devm_qmc_chan_get_bychild(struct device *dev, + struct device_node *np) +{ + struct qmc_chan *qmc_chan; + struct qmc_chan **dr; + + dr = devres_alloc(devm_qmc_chan_release, sizeof(*dr), GFP_KERNEL); + if (!dr) + return ERR_PTR(-ENOMEM); + + qmc_chan = qmc_chan_get_bychild(np); + if (!IS_ERR(qmc_chan)) { + *dr = qmc_chan; + devres_add(dev, dr); + } else { + devres_free(dr); + } + + return qmc_chan; +} +EXPORT_SYMBOL(devm_qmc_chan_get_bychild); + MODULE_AUTHOR("Herve Codina "); MODULE_DESCRIPTION("CPM QMC driver"); MODULE_LICENSE("GPL"); -- cgit