[PATCH v5 29/36] memory: tegra20-emc: Continue probing if timings are missing in device-tree
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2020-08-14 00:08:38
Also in:
dri-devel, linux-devicetree, linux-tegra, lkml
Subsystem:
memory controller drivers, the rest · Maintainers:
Krzysztof Kozlowski, Linus Torvalds
EMC driver will become mandatory after turning it into interconnect provider because interconnect users, like display controller driver, will fail to probe using newer device-trees that have interconnect properties. Thus make EMC driver to probe even if timings are missing in device-tree. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/memory/tegra/tegra20-emc.c | 34 ++++++++++++++---------------- 1 file changed, 16 insertions(+), 18 deletions(-)
diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index db6a4bcb92fb..89e077d797e7 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c@@ -386,6 +386,11 @@ tegra_emc_find_node_by_ram_code(struct device *dev) u32 value, ram_code; int err; + if (of_get_child_count(dev->of_node) == 0) { + dev_info(dev, "device-tree doesn't have memory timings\n"); + return NULL; + } + if (!of_property_read_bool(dev->of_node, "nvidia,use-ram-code")) return of_node_get(dev->of_node);
@@ -454,6 +459,9 @@ static long emc_round_rate(unsigned long rate, struct tegra_emc *emc = arg; unsigned int i; + if (!emc->num_timings) + return clk_get_rate(emc->clk); + min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate); for (i = 0; i < emc->num_timings; i++) {
@@ -698,13 +706,6 @@ static int tegra_emc_probe(struct platform_device *pdev) struct tegra_emc *emc; int irq, err; - /* driver has nothing to do in a case of memory timing absence */ - if (of_get_child_count(pdev->dev.of_node) == 0) { - dev_info(&pdev->dev, - "EMC device tree node doesn't have memory timings\n"); - return 0; - } - irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "interrupt not specified\n");
@@ -712,23 +713,20 @@ static int tegra_emc_probe(struct platform_device *pdev) return irq; } - np = tegra_emc_find_node_by_ram_code(&pdev->dev); - if (!np) - return -EINVAL; - emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL); - if (!emc) { - of_node_put(np); + if (!emc) return -ENOMEM; - } emc->clk_nb.notifier_call = tegra_emc_clk_change_notify; emc->dev = &pdev->dev; - err = tegra_emc_load_timings_from_dt(emc, np); - of_node_put(np); - if (err) - return err; + np = tegra_emc_find_node_by_ram_code(&pdev->dev); + if (np) { + err = tegra_emc_load_timings_from_dt(emc, np); + of_node_put(np); + if (err) + return err; + } emc->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(emc->regs))
--
2.27.0